NONE 20260626103519009 wseas/wseas content-registration-form@crossref.org content-registration-form International Journal of Chemical Engineering and Materials 2945-0519 Ruki̇ye Özteki̇n Department of Environmental Engineering Dokuz Eylül University Tınaztepe Campus, 35160 Buca/Izmir, TURKEY Deli̇a Teresa Sponza Department of Environmental Engineering Dokuz Eylül University Tınaztepe Campus, 35160 Buca/Izmir, TURKEY The heterogeneous photocatalysis of perfluoroalkyl substances (PFAS), is an effective and advanced technology for their removal from water with relatively high efficiency. PFASs have received increasing attention in recent years, particularly because of their potential as reproductive and developmental toxins, endocrine disruptors, and carcinogens. Perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) photodegradation were investigated with heterogeneous indium oxide (In2O3)/gallium oxide (Ga2O3) nanocomposite under increasing sun ligth powers, In2O3/Ga2O3 nanocomposite concentration, pH, temperature, PFOA and PFOS concentrations. The characterizations and morphological properties of samples were measured with XRD, EDX, XPS, FTIR, ICP-OES, STEM and FESEM analyses, respectively. XRD pattern of In2O3/Ga2O3 displays a number of peaks at 2θ = 20.50o, 30.40o, 36.11o, 52.37o, and 60.02o, respectively, corroborated to (221), (222), (400), (440) and (622) lattice planes of monoclinic WO3 (JCPDS # 08–0459). For maximum 99% PFOA and 98% PFOS photodegradation efficiencies the In2O3/Ga2O3 anocomposite concentration, and time should be 0.75 mg/l and 5 min at 1000 mg/l PFOA and PFOS concentrations. The In/Ga ratios with In2O3 target powers of 40 W were 69.80% in the In2O3/Ga2O3 nanocomposites with EDS spectrum. Spectrums of oxygen, gallium and indium were measured at 64.31%, 21.02% and 14.67%, respectively, in the In2O3/Ga2O3 nanocomposites. We observed that when the In2O3 target power increases, the ratio of indium to gallium also increases, which means that the proportion of indium increases, and the conductivity will improve. In2O3/Ga2O3 heterostructures possess significantly lower resistivity (0.49 ɷ.cm) (higher conductivity) compared with pure Ga2O3 nanobelts (10.87 ɷ.cm) as well as Ga2O3 nanowires (300-500 ɷ.cm). The reusability studies showed the resistance of the In2O3/Ga2O3 heterogenous nanocomposite.Up to the 60th cycle, the photodegradation efficiencies for both PFOA and PFOS were consistently recorded at 99%. After the 80th cycle, the efficiency slightly decreased to 98%, and after 100th cycles 97% photodegradation yields was detected. The optimized conditions for pH, rotating speed and temperature should be as follows: 7.0, 30/40oC and 5 rpm, respectively. The PFOA and PFOS photodegradation kinetic can be defined by Langmuir–Hinshelwood equation with k values of 0.087 and 0.099 min-1 for PFOS and PFOA, respectively at a sun ligth power of 80 W/m2. The fluorine content associated with declined PFOS, confirming that fluorine phase increased steadily, indicating defluorination process was occurred. The defluorination percentage increased proportionally with treatment time, reaching approximately 86-88% after photodegradation process. 06 26 2026 06 26 2026 50 3 https://creativecommons.org/licenses/by/4.0/deed.en_US 10.37394/232031.2026.5.3 https://wseas.com/journals/cem/2026/a06cem-003(2026).pdf P. Aditi, A.H.M.A. Sadmani, R. Debra, C. Ni-Bin, G. Ramesh, Per and Polyfluoroalkyl Substances (PFAS) as a Contaminant of Emerging Concern in Surface Water: A Transboundary Review of Their Occurrences and Toxicity Effects, Journal of Hazardous Materials, Vol.419, 2021, 126361. J.B. Brown, J.M. Conder, J.A. Arblaster, C.P. Higgins, Assessing Human Health Risks from Per- and Polyfluoroalkyl Substance (PFAS)-Impacted Vegetable Consumption: A Tiered Modelling Approach, Environmental Science & Technology, Vol.54, 2020, pp. 15202–15214. M. Sadia, I. Nollen, R. Helmus, T.L. Ter Laak, F. Been, A. Praetorius, A.P. van Wezel, Occurrence, Fate, and Related Health Risks of PFAS in Raw and Produced Drinking Water, Environmental Science & Technology, Vol.57, No.8, 2023, pp. 3062–3074. R.B. Jain, Association Between Thyroid Profile and Perfluoroalkyl Acids: Data from NHNAES 2007–2008, Environmental Research, Vol.126, 2013, pp. 51–59. M.B. Rosen, K.P. Das, J. Rooney, B. Abbott, C. Lau, J.C. Corton, PPARα-Independent Transcriptional Targets of Perfluoroalkyl Acids Revealed by Transcript Profiling, Toxicology, Vol.387, 2017, pp. 95–107. J. Liu, S. Mejia Avendano, Microbial Degradation of Polyfluoroalkyl Chemicals in the Environment: A Review, Environment International, Vol.61, 2013, pp. 98–114. Y. Li, Y. Zhang, X. Liu, X. Zhou, T. Ye, Q. Fu, M. Du, Q. Lu, Y. Zheng, D. Wang, Per- and Polyfluoroalkyl Substances Exacerbate the Prevalence of Plasmid-Borne Antibiotic Resistance Genes by Enhancing Natural Transformation, In Vivo Stability, and Expression in Bacteria, Water Research, Vol.272, 2025, 122972. N. Yashir, Q. Sun, X. Zhang, M. Ma, D. Wang, Y. Feng, X. Song, Co-Occurrence of Microplastics, PFASs, Antibiotics, and Antibiotic Resistance Genes in Groundwater and Their Composite Impacts on Indigenous Microbial Communities: A Field Study, Science of the Total Environment, Vol.961, 2025, 178373. I.J. Neuwald, D. Hübner, H.L. Wiegand, V. Valkov, U. Borchers, K. Nödler, M. Scheurer, S.E. Hale, H.P.H. Arp, D. Zahn, Ultra-Short-Chain PFASs in the Sources of German Drinking Water: Prevalent, Overlooked, Difficult to Remove, and Unregulated, Environmental Science & Technology, Vol.56, No.10, 2022, pp. 6380–6390. E. Gorrochategui, E. Perez-Albaladejo, J. Casas, S. Lacorte, C. Porte, Perfluorinated Chemicals: Differential Toxicity, Inhibition of Aromatase Activity and Alteration of Cellular Lipids in Human Placental Cells, Toxicology and Applied Pharmacology, Vol.277, No.2, 2014, pp. 124-130. B.J. Yates, R. Darlington, R. Zboril, V.K. Sharma, High-Valent Iron-Based Oxidants to Treat Perfluorooctanesulfonate and Perfluorooctanoic Acid in Water, Environmental Chemistry Letters, Vol.12, No.3, 2014, pp. 413-417. Y. Wang, P. Zhang, G. Pan, H. Chen, Ferric Ion Mediated Photochemical Decomposition of Perfluorooctanoic Acid (PFOA) by 254 nm UV light, Journal of Hazardous Materials, Vol.160, No.1, 2008, pp. 181-186. C. Gallen, C. Baduel, F.Y. Lai, K. Thompson, J. Thompson, M. Warne, J.F. Mueller, Spatio-Temporal Assessment of Perfluorinated Compounds in the Brisbane River System, Australia: Impact of A Major Flood Event, Marine Pollution Bulletin, Vol.85, No.2, 2014, pp. 597-605. J.M. Armitage, M. MacLeod, I.T. Cousins, Comparative Assessment of the Global Fate and Transport Pathways of Long-Chain Perfluorocarboxylic Acids (PFCAs) and Perfluorocarboxylates (PFCs) Emitted from Direct Sources, Environmental Science & Technology, Vol.43, No.15, 2009, pp. 5830-5836. G.B. Post, P.D. Cohn, K.R. Cooper, Perfluorooctanoic Acid (PFOA), An Emerging Drinking Water Contaminant: A Critical Review of Recent Literature, Environmental Research, Vol.116, 2012, pp. 93–117. A. Pistocchi, R. Loos, R., A Map of European Emissions and Concentrations of PFOS and PFOA, Environmental Science & Technology, Vol. 43, No.24, 2009, pp. 9237-9244. C. Flores, F. Ventura, J. Martin-Alonso, J. Caixach, Occurrence of Perfluorooctane Sulfonate (PFOS) and Perfluorooctanoate (PFOA) in NE Spanish Surface Waters and Their Removal in A Drinking Water Treatment Plant that Combines Conventional and Advanced Treatments in Parallel Lines, Science of the Total Environment, Vol.461, 2013, pp. 618-626. W. Zhang, Y. Zhang, S. Taniyasu, L.W. Yeung, P.K. Lam, J. Wang, X. Li, N. Yamashita, J. Dai, Distribution and Fate of Perfluoroalkyl Substances in Municipal Wastewater Treatment Plants in Economically Developed Areas of China, Environmental Pollution, Vol.176, 2013, pp. 10-17. H. Chen, X. Wang, C. Zhang, R. Sun, J. Han, G. Han, W. Yang, X. He, Occurrence and Inputs of Perfluoroalkyl Substances (PFAS) from Rivers and Drain Outlets to the Bohai Sea, China, Environmental Pollution, Vol.221, 2017, pp. 234-243. M. Murakami, C. Morita, T. Morimoto, H. Takada, Source Analysis of Perfluorocarboxylates in Tokyo Bay during Dry Weather and Wet Weather Using Sewage Markers, Environmental Chemistry, Vol.8, No.4, 2013, pp. 2017, 355. J.E. Naile, J.S. Khim, T. Wang, C. Chen, W. Luo, B.O. Kwon, J. Park, C.H. Koh, P.D. Jones, Y. Lu, J.P. Giesy, Perfluorinated Compounds in Water, Sediment, Soil and Biota from Estuarine and Coastal Areas of Korea, Environmental Pollution, Vol.158, No.5, 2010, pp. 1237-1244. A. Podder, A. Sadmani, D. Reinhart, N. Chang, R. Goel, Per- and Poly-Fluoroalkyl Substances (PFAS) as a Contaminant of Emerging Concern in Surface Water: A Transboundary Review of Their Occurrences and Toxicity Effects, Journal of Hazardous Materials, Vol.419, 2021, 126361. J. Domingo, M. Nadal, Human Exposure to Per- and Polyfluoroalkyl Substances (PFAS) through Drinking Water: A Review of the Recent Scientific Literature, Environmental Research, Vol.177, 2019, 108648. USEPA, National Primary Drinking Water Regulations, 2024, pp. 1-9, https://www.mallard-inc.com/wp-content/uploads/2019/05/Drinking-Water-Standards.pdf, (accessed on 05 November 2025). USEPA, Interim Updated PFOA and PFOS Health Advisories. 2022. Available online: https://www.epa.gov/sdwa/drinking-water-health-advisories-pfoa-and-pfos, (accessed on 07 November 2025). Eurofins, PFAS in the Revised Drinking Water Directive (DWD), 2023. Available online: https://www.eurofins.se/tjaenster/miljoeoch-vatten/nyheter-miljo/pfas-in-the-revised-drinking-water-directive-dwd/, (accessed on 09 November 2025). S.C.E. Leung, P. Shukla, D. Chen, E. Eftekhari, H. An, F. Zare, N. Ghasemi, D. Zhang, N.-T. Nguyen, Q. Li, Emerging Technologies for PFOS/PFOA Degradation and Removal: A Review, Science of the Total Environment, Vol.827, 2022, 153669. M. Ateia, A. Maroli, N. Tharayil, T. Karanfil, The Overlooked Short- and Ultrashort-Chain Poly- and Perfluorinated Substances: A Review, Chemosphere, Vol.220, 2019, pp. 866–882. T. Mastropietro, R. Bruno, E. Pardo, D. Armentano, Reverse Osmosis and Nanofiltration Membranes for Highly Efficient PFAS Removal: Overview, Challenges and Future Perspectives, Dalton Transactions, Vol.50, 2021, pp. 5398–5410. O.C. Olatunde, A.T. Kuvarega, D.C. Onwudiwe, Photo-Enhanced Degradation of Polyfluoroalkyl and Perfluoroalkyl Substances, Heliyon, Vol.6, 2020, e05614. Y.-L. Zhang, W.-L. Wang, M.-Y. Lee, Z.-W. Yang, Q.-Y. Wu, N. Huang, H.-Y. Hu, Promotive Effects of Vacuum-UV/UV (185/254 nm) Light on Elimination of Recalcitrant Trace Organic Contaminants by UV-AOPs during Wastewater Treatment and Reclamation: A Review, Science of the Total Environment, Vol.818, 2022, 151776. S. Verma, B. Mezgebe, C.A. Hejase, E. Sahle-Demessie, M.N. Nadagouda, Photodegradation and Photocatalysis of Per- and Polyfluoroalkyl Substances (PFAS): A Review of Recent Progress, Next Materials, Vol.2, 2024, pp. 1–12. H. Wang, L. Zhang, Z. Chen, J. Hu, S. Li, Z. Wang, J. Liu, X. Wang, Semiconductor Heterojunction Photocatalysts: Design, Construction, and Photocatalytic Performances, Chemical Society Reviews, Vol.43, 2014, pp. 5234–5244. J. Luo, W. Li, R. Yin, Q. Liu, X. Xin, L. Yang, K. He, D. Ma, S. Lv, D. Xing, Photocatalyst Degradation of Perfluorooctanoic Acid in Water: Mechanisms, Approaches, and Perspectives, Separation and Purification Technology, Vol.338, 2024, 126503. V. Kitsiou, N. Filippidis, D. Mantzavinos, I. Poulios, Heterogeneous and Homogeneous Photocatalytic Degradation of the Insecticide Imidacloprid in Aqueous Solutions, Applied Catalysis B: Environment and Energy, Vol.86, 2009, pp. 27-35. R. Giri, H. Ozaki, T. Morigaki, S. Taniguchi, R. Takanami, UV Photolysis of Perfluorooctanoic Acid (PFOA) in Dilute Aqueous Solution, Water Science and Technology, Vol.63, No.2, 2011, pp. 276-282. N. Merino, Y. Qu, R.A. Deeb, E.L. Hawley, M.R. Hoffmann, S. Mahendra, Degradation and Removal Methods for Perfluoroalkyl and Polyfluoroalkyl Substances in Water, Environmental Engineering Science, Vol.33, No.9, 2016, pp. 615-649. B. Zhao, X. Li, L. Yang, F. Wang, J. Li, W. Xia, W. Li, L. Zhou, C. Zhao, b-Ga2O3 Nanorod Synthesis with A One-step Microwave Irradiation Hydrothermal Method and Its Efficient Photocatalytic Degradation for Perfluorooctanoic Acid, Photochemistry and Photobiology, Vol.91, 2015, pp. 42-47. X. Li, P. Zhang, L. Jin, T. Shao, Z. Li, J. Cao, Efficient Photocatalytic Decomposition of Perfluorooctanoic Acid by Indium Oxide and Its Mechanism, Environmental Science & Technology, Vol.46, 2012, pp. 5528–5534. Z. Li, P. Zhang, T. Shao, X. Li, In2O3 Nanoporous Nanosphere: A Highly Efficient Photocatalyst for Decomposition of Perfluorooctanoic Acid, Applied Catalysis B: Environment and Energy, Vol.125, 2012, pp. 350-357. Z. Li, P. Zhang, J. Li, T. Shao, J. Wang, L. Jin, Synthesis of In2O3 Porous Nanoplates for Photocatalytic Decomposition of Perfluorooctanoic Acid (PFOA), Catalysis Communications, Vol.43, 2014, pp. 42-46. C. Xu, P. Qiu, H. Chen, F. Jiang, X. Wang, Fabrication of Two-Dimensional Indium Oxide Nanosheets with Graphitic Carbon Nitride Nanosheets as Sacrificial Templates, Materials Letters, Vol.242, 2019, pp. 24–27. F. Jiang, H. Zhao, H. Chen, C. Xu, J. Chen, Enhancement of Photocatalytic Decomposition of Perfluorooctanoic Acid on CeO2/In2O3, RSC Advances, Vol.6, 2016, pp. 72015–72021. Y. Wu, Y. Li, C. Fang, C. Li, Highly Efficient Degradation of Perfluorooctanoic Acid over a MnOx-Modified Oxygen-Vacancy-Rich In2O3 Photocatalyst, ChemCatChem, Vol.11, No.9, 2019, pp. 2297–2303. M. Qin, J. Ma, W. Ke, P. Qin, H. Lei, H. Tao, X. Zheng, L. Xiong, Q. Liu, Z. Chen, J. Lu, G. Yang, G. Fang, Perovskite Solar Cells Based on Low-Temperature Processed Indium Oxide Electron Selective Layers, ACS Applied Materials & Interfaces, Vol.8, 2016, pp. 8460–8466. B. Xu, J.L. Zhou, A. Altaee, M.B. Ahmed, M.A.H. Johir, J. Ren, X. Li, Improved Photocatalysis of Perfluorooctanoic Acid in Water and Wastewater by Ga2O3/UV System Assisted by Peroxymonosulfate, Chemosphere, Vol.239, 2020, 124722. H. Ryou, T.H. Yoo, Y. Yoon, I.G. Lee, M. Shin, J. Cho, B.J. Cho, W.S. Hwang, Hydrothermal Synthesis and Photocatalytic Property of Sn-doped-Ga2O3 Nanostructure, ECS Journal of Solid State Science and Technology, Vol.9, 2020, 045009. X. Tan, G. Chen, D. Xing, W. Ding, H. Liu, T. Li, Y. Huang, Indium-Modified Ga2O3 Hierarchical Nanosheets as Efficient Photocatalysts for the Degradation of Perfluorooctanoic Acid, Environmental Science: Nano, Vol.7, 2020, pp. 2229–2239. A.V. Almaev, E.V. Chernikov, N.A. Davletkildeev, D.V. Sokolov, Oxygen Sensors Based on Gallium Oxide Thin Films with Addition of Chromium, Superlattices and Microstructures, Vol.139, 2020, 106392. A. Habib, M. S. Khan, M. Zubair, I. U. Hasan, Ni-Doped In2O3 Nanoparticles and Their Composite with rGO for Efficient Degradation of Organic Pollutants in Wastewater under Visible Light Irradiation, International Journal of Molecular Sciences, Vol.24, 2023, 7950. T. Shao, P. Zhang, L. Jin, Z. Li, Photocatalytic Decomposition of Perfluorooctanoic Acid in Pure Water and Sewage Water by Nanostructured Gallium Oxide, Applied Catalysis B: Environment and Energy, Vol.142, 2013a, pp. 654-661. J. Chen, S. Wang, S. Wang, R. Tang, H. Chen, Facilely Prepared Bi4O7 Commercial Ga2O3 Modified with Optimized Photocatalytic Efficiency for Perfluorooctanoic Acid Degradation, Applied Surface Science, Vol.673, 2024, 160877. C. Fu, X. Xu, C. Zheng, X. Liu, D. Zhao, W. Qiu, Photocatalysis of Aqueous PFOA by Common Catalysts of In2O3, Ga2O3, TiO2, CeO2 and CdS: Influence Factors and Mechanistic Insights, Environmental Geochemistry and Health, Vol.44, 2022, pp. 2943–2953. R. Fernandes, A. Silva, B. Cardoso, P.J.G. Coutinho, L. Pereira, Potential of Photocatalytic Nanomaterials for PFOA and PFOS Degradation: Challenges and Opportunities, Journal of Environmental Chemical Engineering, Vol.13, 2024, 115201. X.J. Lyu, W.W. Li, P.K.S. Lam, H.Q. Yu, Photodegradation of Perfluorooctane Sulfonate in Environmental Matrices, Separation and Purification Technology, Vol.151, 2015, pp. 172-176. T. Shao, P. Zhang, Z. Li, L. Jin, Photocatalytic Decomposition of Perfluorooctanoic Acid in Pure Water and Wastewater by Needle-Like Nanostructured Gallium Oxide, Chinese Journal of Catalysis, Vol.34, No.8, 2013, pp. 1551-1559. Z. Zsilak, E. Szabo-Bardos, O. Fonagy, O. Horvath, K. Horvath, P. Hajos, Degradation of Benzenesulfonate by Heterogeneous Photocatalysis Combined with Ozonation, Catalysis Today, Vol.230, 2014, pp. 55-60. M.J. Chen, S.L. Lo, Y.C. Lee, C.C. Huang, Photocatalytic Decomposition of Perfluorooctanoic Acid by Transition-Metal Modified Titanium Dioxide, Journal of Hazardous Materials, Vol.288, 2015, pp. 168-175. M.R. Hoffmann, S.T. Martin, W. Choi, D.W. Bahnemann, Environmental Applications of Semiconductor Photocatalysis, Chemical Reviews, Vol.95, 1995, pp. 69-96. S. Kutsuna, Y. Nagaoka, K. Takeuchi, H. Hori, TiO2-Induced Heterogeneous Photodegradation of a Fluorotelomer Alcohol in Air, Environmental Science & Technology, Vol.40, 2006, pp. 6824-6829. S. C. Panchangam, A. Y. Lin, K. L. Shaik, C. F. Lin, Decomposition of Perfluorocarboxylic Acids (PFCAs) by Heterogeneous Photocatalysis in Acidic Aqueous Medium, Chemosphere, Vol.77, No.2, 2009, pp. 242-248. Y. Qu, C. Zhang, F. Li, J. Chen, Q. Zhou, Photo-Reductive Defluorination of Perfluorooctanoic Acid in Water, Water Research, Vol.44, No.9, 2010, pp. 2939-2947. Y. Wang, P. Zhang, Photocatalytic Decomposition of Perfluorooctanoic Acid (PFOA) by TiO2 in the Presence of Oxalic Acid, Journal of Hazardous Materials, Vol.192, No.3, 2011, pp. 1869-1875. K. Okitsu, K. Iwasaki, Y. Yobiko, H. Bandow, R. Nishimura, Y. Maeda, Sonochemical Degradation of Azo Dyes in Aqueous Solution: A New Heterogeneous Kinetics Model taking into Account the Local Concentration of OH Radicals and Azo Dyes, Ultrasonics Sonochemistry, Vol.12, No.4, 2005, pp. 255-262. C. Vecitis, H. Park, J. Cheng, B. Mader, M. Hoffmann, Enhancement of Perfluorooctanoate and Perfluorooctanesulfonate Activity at Acoustic Cavitation Bubble Interfaces, Journal of Physical Chemistry C, Vol.112, No.43, 2008, pp. 16850-16857. Y. Zhang, J. Zhang, Y. Xiao, V.W. Chang, T. T. Lim, Direct and Indirect Photodegradation Pathways of Cytostatic Drugs under UV Germicidal Irradiation: Process Kinetics and Influences of Water Matrix Species and Oxidant Dosing, Journal of Hazardous Materials, Vol.324, 2017, pp. 481-488. J. Liang, L. Guo, B. Xiang, X. Wang, J. Tang, Y. Liu, Research Updates on the Mechanism and Influencing Factors of the Photocatalytic Degradation of Perfluorooctanoic Acid (PFOA) in Water Environments, Molecules, Vol.28, 2023, 4489. X. Liu, X. Duan, T. Bao, D. Hao, Z. Chen, W. Wei, D. Wang, S. Wang, B.-J. Ni, High-Performance Photocatalytic Decomposition of PFOA by BiOX/TiO2 Heterojunctions: Self-Induced Inner Electric Fields and Band Alignment, Journal of Hazardous Materials, Vol.430, 2022, 128195. Z. Liu, Z. Chen, J. Gao, Y. Yu, Y. Men, C. Gu, J. Liu, Accelerated Degradation of Perfluorosulfonates and Perfluorocarboxylates by UV/Sulfite + Iodide: Reaction Mechanisms and System Efficiencies, Environmental Science & Technology, Vol.56, No.6, 2022, pp. 3699–3709. P. Yin, Z. Hu, X. Song, J. Liu, N. Lin, Activated Persulfate Oxidation of Perfluorooctanoic Acid (PFOA) in Groundwater under Acidic Conditions, International Journal of Environmental Research and Public Health, Vol.13, No.6, 2016, 602. J. N. Uwayezu, I. Carabante, P. van Hees, P. Karlsson, J. Kumpiene, Validation of UV/Persulfate as a PFAS Treatment of Industrial Wastewater and Environmental Samples, Journal of Water Process Engineering, Vol.53, 2023, 103614. B. Esfahani, M. Mohseni, Fluence-Based Photo-Reductive Decomposition of PFAS Using Vacuum UV (VUV) Irradiation: Effects of Key Parameters and Decomposition Mechanism, Journal of Environmental Chemical Engineering, Vol.10, 2022, 107050. A. Mills, R. H. Davies, D. Worsley, Water Purification by Semiconductor Photocatalysis, Chemical Society Reviews, Vol.22, No.6, 1993, pp. 417–425. H. Wang, L. Zhang, Z. Chen, J. Hu, S. Li, Z. Wang, J. Liu, X. Wang, Semiconductor Heterojunction Photocatalysts: Design, Construction, and Photocatalytic Performances, Chemical Society Reviews, Vol.43, No.15, 2014, pp. 5234–5244. E. Bouteh, M. J. Bentel, E. L. Cates, Semiconductor-Hydrophobic Material Interfaces as a New Active Site Paradigm for Photocatalytic Degradation of Perfluorocarboxylic Acids, Journal of Hazardous Materials, Vol.453, 2023, 131437. R. Cheng, J. Xia, J. Wen, P. Xu, X. Zheng, Nano Metal-Containing Photocatalysts for the Removal of Volatile Organic Compounds: Doping, Performance, and Mechanisms, Nanomaterials, Vol.12, 2022, 1335. C. Xia, X. Lim, H. Yang, B. M. Goodson, J. Liu, Degradation of Per- and Polyfluoroalkyl Substances (PFAS) in Wastewater Effluents by Photocatalysis for Water Reuse, Journal of Water Process Engineering, Vol.46, 2022, 102556. J. Wen, H. Li, L. D. M. Ottosen, J. Lundqvist, L. Vergeynst, Comparison of the Photocatalytic Degradability of PFOA, PFOS, and GenX Using Fe-Zeolite in Water, Chemosphere, Vol.344, 2023, 140344. F. Li, Z. Wei, K. He, L. Blaney, X. Cheng, T. Xu, W. Liu, D. Zhao, A Concentrate-and-Destroy Technique for Degradation of Perfluorooctanoic Acid in Water Using a New Adsorptive Photocatalyst, Water Research, Vol.185, 2020, 116219. M. Qanbarzadeh, L. DiGiacomo, E. Bouteh, E. Z. Alhamdan, M. M. Mason, B. Wang, M. S. Wong, E. L. Cates, An Ultraviolet/Boron Nitride Photocatalytic Process Efficiently Degrades Poly /Perfluoroalkyl Substances in Complex Water Matrices, Environmental Science & Technology Letters, Vol.10, No.8, 2023, pp. 705–710. L. Duan, B. Wang, K. Heck, S. Guo, C. A. Clark, J. Arredondo, M. Wang, T. P. Senftle, P. Westerhoff, X. Wen, Y. Song, M. S. Wong, Efficient Photocatalytic PFOA Degradation Over Boron Nitride, Environmental Science & Technology Letters, Vol.7, No.8, 2020, pp. 613–619. J. H. Zar, Biostatistical Analysis, Prentice-Hall, Englewood Cliffs, 1984. Statgraphics Centurion XV, Sofware, StatPoint Inc, Statgraphics Centurion XV, Herndon, VA, USA, 2005. I. Donmez, C. Ozgit-Akgun, N. Biyikli, Low Temperature Deposition of Ga2O3 Thin Films Using Trimethylgallium and Oxygen Plasma, Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films, Vol.31, 2013, 01A110. A. Sharma, M. Varshney, H. Saraswat, S. Chaudhary, J. Parkash, H.-J. Shin, K.-H. Chae, S.-O. Won, Nano-Structured Phases of Gallium Oxide (GaOOH, -Ga2O3, -Ga2O3, -Ga2O3, -Ga2O3, and -Ga2O3): Fabrication, Structural, and Electronic Structure Investigations, International Nano Letters, Vol.10, 2020, pp. 71–79. S. Tan, L.B. Gil, N. Subramanian, D.S. Sholl, S. Nair, C.W. Jones, J.S. Moore, Y. Liu, R.S. Dixit, J.G. Pendergast, Catalytic Propane Dehydrogenation over In2O3–Ga2O3 Mixed Oxides, Applied Catalysis A: General, Vol.498, 2015, pp. 167–175. A.K. Nayak, S. Lee, Y. Sohn, D. Pradhan, Biomolecule-Assisted Synthesis of In(OH)3 Nanocubes and In2O3 Nanoparticles: Photocatalytic Degradation of Organic Contaminants and CO Oxidation, Nanotechnology, Vol.26, 2015, 485601. A.U. Mane, A.J. Allen, R.K. Kanjolia, J.W. Elam, Indium Oxide Thin Films by Atomic Layer Deposition Using Trimethylindium and Ozone, Journal of Physical Chemistry C, Vol.120, 2016, pp. 9874–9883. M. Faur, M. Faur, D.T. Jayne, M. Goradia, C. Goradia, XPS Investigation of Anodic Oxides Grown on P-type InP, Surface and Interface Analysis, Vol.15, 1990, pp. 641–650. M.L. Miller, W.R. Linton, X-ray Photoelectron Spectroscopy of Thermally Treated Silica (SiO2) Surfaces, Analytical Chemistry, Vol.57, 1985, pp. 2314–2319. L. Sun, R. Li, W. Zhan, Y. Yuan, X. Wang, X. Han, Y. Zhao, Double-Shelled Hollow Rods Assembled from Nitrogen/Sulfur Codoped Carbon Coated Indium Oxide Nanoparticles as Excellent Photocatalysts, Nature Communications, Vol.10, 2019, 2270. A. Navarro-Quezada, S. Alamé, N. Esser, J. Furthmüller, F. Bechstedt, Z. Galazka, D. Skuridina, P. Vogt, Near Valence-band Electronic Properties of Semiconducting Ga2O3 (100) Single Crystals, Physical Review B: Condensed Matter and Materials Physics, Vol.92, 2015, 195306. C. Huang, W. Mu, H. Zhou, Y. Zhu, X. Xu, Z. Jia, L. Zheng, X. Tao, Effect of OH on Chemical Mechanical Polishing of-Ga2O3 (100) Substrate using an Alkaline Slurry, RSC Advances, Vol.8, 2018, pp. 6544–6550. A. Gou, Y. Cheng, F. Zhu, T. Yu, H. Yin, L. Che, J. Chen, X. Zhang, Study on Oxygen Vacancies in Gallium Oxide Nanostructures, Journal of Materials Science: Materials in Electronics, Vol.34, No.12 2023, Article number:1052. Z. Liu, T. Yamazaki, Y. Shen, T. Kikuta, N. Nakatani, Y. Li, O2 and CO sensing of Ga2O3 multiple nanowire gas sensors, Sensors and Actuators, B: Chemical, Vol.129, No.2, 2008, pp. 666–670. A. Afzal, β-Ga2O3 Nanowires and Thin Films for Metal Oxide Semiconductor Gas Sensors: Sensing Mechanisms and Performance Enhancement Strategies, Journal of Materiomics, Vol.5, No.4, 2019, pp. 542-557. M. H. Brodsky, Amorphous Semiconductors, Springer-Verlag, Berlin, Heidelberg, New York, 1979. J. W. Orton, M. J. Powel, The Hall Effect in Polycrystalline and Powdered Semiconductors, Reports on Progress in Physics, Vol.43, 1980, 1263. J. Y. W. Seto, The Electrical Properties of Polycrystalline Silicon Film, Journal of Applied Physics, Vol.46, No.12, 1975, pp. 5247-5254. M. N. Martyshov, P. A. Forsh, V. Yu. Timoshenko, P. K. Kashkarov, Electrical Conductivity in Anisotropic Porous Silicon Films, Journal of Nanoelectronics and Optoelectronics, Vol.4, 2009, pp. 134-136. N. F. Mott, E. A. Devis, Electronic Properties in Non-crystalline Materials, Clarendon, Press, Oxford, 1971. R. Mansfield, S. Abboudy, P. Pozooni, Hopping Conduction in n-Type Indium Phosphide, Philosophical Magazine B, Vol.57, No.6, 1988, pp. 777-789. M. M. Abdul-Gader, M. A. Al-Basha, K. A. Wishah, Temperature Dependence of DC Conductivity of As-Deposited and Annealed Selenium Films, International Journal of Electronics, Vol.85, 1998, pp. 21-41. N. F. Mott, Conduction in Glasses Containing Transition Metal Ions, Journal of Non-Crystalline Solids, Vol.1, No.1, 1968, pp. 1-17. O. Bierwagen, J. S. Speck, High Electron Mobility In2O3 (001) and (111) Thin Films with Nondegenerate Electron Concentration, Applied Physics Letters, Vol.97, No.7, 2010, 072103. N. Serin, A. Yildiz, A.A. Alsaç, T. Serin, Estimation of Compensation Ratio by Identifying the Presence of Different Hopping Conduction Mechanisms in SnO2 Thin Films, Thin Solid Films Vol.519, No.7, 2011, pp. 2302-2307. E. Barsoukov, J. R. Macdonald, Impedance Spectroscopy: Theory, Experiment, and Applications, John Wiley & Sons, New Jersey, 2005. M. Ben-Chorin, F. Moller, F. Koch, W. Schirmacher, M. Eberhard, Hopping Transport on A fractal: AC Conductivity of Porous Silicon, Physical Review B, Vol.51, 1995, 2199. R. A. Street, G. Davis, A. D. Yoffe, The Square Law Dependence with Frequency of the Electrical Conductivity of As2Se3, Journal of Non-Crystalline Solids, Vol.5, No.3, 1971, pp. 276-278. J. C. Dyre, P. Maass, B. Roling, D. L. Sidebottom, Fundamental Questions Relating to Ion Conduction in Disordered Solids, Reports on Progress in Physics, Vol.72, No.4, 2009, 046501. Y. Huang, Z. Wang, Q. Wang, C. Gu, C. Tang, Y. Bando, D. Golberg, Quasi-Aligned Ga2O3 Nanowires Grown on Brass Wire Meshes and Their Electrical and Field-Emission Properties, Journal of Physical Chemistry C, Vol.113, 2009, pp. 1980–1983. J. Lin, Y. Huang, Y. Bando, C. Tang, C. Li, D. Golberg, Synthesis of In2O3 Nanowire-Decorated Ga2O3 Nanobelt Heterostructures and Their Electrical and Field-Emission Properties, ACS Nano, Vol.4, No.4, 2010, pp. 2452–2458. Z. Zhang, K. Yao, Y. Liu, C. Jin, X. Liang, Q. Chen, L. M. Peng, Quantitative Analysis of Current-Voltage Characteristics of Semiconducting Nanowires: Decoupling of Contact Effects, Advanced Functional Materials, Vol.17, 2007, pp. 2478–2489. Z. Y. Zhang, C. H. Jin, X. L. Liang, Q. Chen, L. M. Peng, Current-Voltage Characteristics and Parameter Retrieval of Semiconducting Nanowires, Applied Physics Letters, Vol.88, 2006, 073102. H. He, R. Orlando, M. A. Blanco, R. Pandey, First-Principles Study of the Structural, Electronic, and Optical Properties of Ga2O3 in its Monoclinic and Hexagonal Phases, Physical Review B: Condensed Matter and Materials Physics, Vol.74, 2006, 195123. J. Zhan, Y. Bando, J. Hu, Y. Li, D. Golberg, Synthesis and Field-Emission Properties of Ga2O3-C Nanocables, Chemistry of Materials, Vol.16, 2004, pp. 5158–5161. C. Cao, Z. Chen, X. An, H. Zhu, Growth and Field Emission Properties of Cactus-Like Gallium Oxide Nanostructures, Journal of Physical Chemistry C, Vol.112, 2008, pp. 95–98. S. Kar, S. Chaudhuri, Synthesis, Photoluminescence and Field Emission Properties of In2O3 Nanowires, Chemical Physics Letters, Vol.422, 2006, pp. 424–428. S. Q. Li, Y. X. Liang, T. H. Wang, Nonlinear Characteristics from In2O3 Nanowires Grown on InAs Substrate. Applied Physics Letters, Vol.88, 2006, 053107. X. Fang, Y. Bando, U. K. Gautam, C. Ye, D. Golberg, Inorganic Semiconductor Nanostructures and Their Field-Emission Applications, Journal of Materials Chemistry, Vol.18, 2008, pp. 509–522. T. Zhai, X. Fang, Y. Bando, Q. Liao, X. Xu, H. Zeng, Y. Ma, J. Yao, D. Golberg, Morphology-Dependent Stimulated Emission and Field Emission of Ordered CdS Nanostructure Arrays, ACS Nano, Vol.3, 2009, pp. 949–959. D. Y. Zhong, G. Y. Zhang, S. Liu, T. Sakurai, E. G. Wang, Universal Field-Emission Model for Carbon Nanotubes on a Metal Tip, Applied Physics Letters, Vol.80, 2002, pp. 506–508. C. Li, G. J. Fang, N. S. Liu, J. Li, L. Liao, F. H. Su, G. H. Li, X. G. Wu, X. Z. Zhao, Structural, Photoluminescence, and Field Emission Properties of Vertically Well-Aligned ZnO Nanorod Arrays, Journal of Physical Chemistry C, Vol.111, 2007, pp. 12566–12571. D. Kaur, M. Kumar, A Strategic Review on Gallium Oxide Based Deep-Ultraviolet Photodetectors: Recent Progress and Future Prospects, Advanced Optical Materials, Vol.9, No.9, 2021, 2002160. X.H. Chen, F.F. Ren, S.L. Gu, J.D. Ye, Review of Gallium-Oxide-Based Solar-Blind Ultraviolet Photodetectors, Photonics Research, Vol.7, 2019, pp. 381-415. P. Li, H. Shi, K. Chen, D. Guo, W. Cui, Y. Zhi, S. Wang, Z. Wu, Z. Chen, W. Tang, Construction of GaN/Ga2O3 p-n Junction for An Extremely High Responsivity Self-Powered UV Photodetector, Journal of Materials Chemistry C, Vol.5, 2017, pp. 10562-10570. R. Raphael, S. Devasia, S. Shaji, E.I. Anila, Effect of Substrate Temperature on the Properties of Spray Deposited Ga2O3 Thin Films, for Solar Blind UV Detector Applications, Optical Materials, Vol.133, 2022, 112915. S. Chen, Y.-Z. Long, H.-D. Zhang, S.-L. Liu, L.-Z. Liu, J.-C. Zhang, G.-X. Liu, F.-K. Shan, Fabrication of Ultrathin In2O3 Hollow Fibers for UV Light Sensing, Physica Scripta, Vol.89, No.11, 2014, 115808. G. Tian, Y. Wu, S. Wu, S. Huang, J. Gao, Influence of Mn and Mg Oxides on the Performance of In2O3 Catalysts for CO2 Hydrogenation to Methanol, Chemical Physics Letters, Vol.786, 2022, 139173. K. Gu, Z. Zhang, K. Tang, J. Huang, M. Liao, L. Wang, Effects of Sputtering Pressure and Oxygen Partial Pressure on Amorphous Ga2O3 Film-Based Solar-Blind Ultraviolet Photodetectors, Applied Surface Science, Vol.605, 2022, 154606. T. Onuma, S. Saito, K. Sasaki, T. Masui, T. Yamaguchi, T. Honda, M. Higashiwaki, Valence Band Ordering in β-Ga2O3 Studied by Polarized Transmittance and Reflectance Spectroscopy, Japanese Journal of Applied Physics, Vol.54, No.11, 2015, 112601. T. Kim, B. Jang, S. Lee, W.-Y. Lee, J. Jang, Improved Negative Bias Stress Stability of Sol-Gel-Processed Mg-Doped In2O3 Thin Film Transistors, IEEE Electron Device Letters, Vol.39, No.12, 2018, pp. 1872–1875. S.-M. Sun, W.-J. Liu, Y.-P. Wang, Y.-W. Huan, Q. Ma, B. Zhu, S.-D. Wu, W.-J. Yu, R.-H. Horng, C.-T. Xia, Q.-Q. Sun, S.-J. Ding, D.W. Zhang, Band Alignment of In2O3/β-Ga2O3 Interface Determined by X-Ray Photoelectron Spectroscopy, Applied Physics Letters, Vol.113, No.3, 2018, 031603. J. A. Spencer, A. L. Mock, A. G. Jacobs, M. Schubert, Y. Zhang, M. J. Tadjer, A Review of Band Structure and Material Properties of Transparent Conducting and Semiconducting Oxides: Ga2O3, Al2O3, In2O3, ZnO, SnO2, CdO, NiO, CuO, and Sc2O3, Applied Physics Letters, Vol. 9, No.1, 2022, 011315. I. Isakov, H. Faber, A. D. Mottram, S. Das, M. Grell, A. Regoutz, R. Kilmurray, M. A. McLachlan, D. J. Payne, T. D. Anthopoulos, Quantum Confinement and Thickness-Dependent Electron Transport in Solution-Processed In2O3 Transistors, Advanced Electronic Materials, Vol.6, No.11, 2020, 2000682. N. Chowdhury, S. Prabakar, H.-K. Choi, Dependency of the Photocatalytic and Photochemical Decomposition of Per- and Polyfluoroalkyl Substances (PFAS) on their Chain Lengths, Functional Groups, and Structural Properties, Water Science & Technology, Vol.84, 2021, pp. 3738–3754. E. Gagliano, M. Sgroi, P. Falciglia, F. Vagliasindi, P. Roccaro, Removal of Poly- and Perfluoroalkyl Substances (PFAS) from Water by Adsorption: Role of PFAS Chain Length, Effect of Organic Matter and Challenges in Adsorbent Regeneration, Water Research, Vol.171, 2019, 115381. P. McCleaf, S. Englund, A. Ostlund, K. Lindegren, K. Wiberg, L. Ahrens, Removal Efficiency of Multiple Poly- and Perfluoroalkyl Substances (PFASs) in Drinking Water Using Granular Activated Carbon (GAC) and Anion Exchange (AE) Column Tests, Water Research, Vol.120, 2017, pp. 77–87. F. Li, J. Duan, S. Tian, H. Ji, Y. Zhu, Z. Wei, D. Zhao, Short-Chain Per- and Polyfluoroalkyl Substances in Aquatic Systems: Occurrence, Impacts and Treatment, Chemical Engineering Journal, Vol.380, 2020, 122506. B. Gomez-Ruiz, P. Ribao, N. Diban, M.J. Rivero, I. Ortiz, A. Urtiaga, Photocatalytic Degradation and Mineralization of Perfluorooctanoic Acid (PFOA) Using a Composite TiO2-rGO Catalyst, Journal of Hazardous Materials, Vol.344, 2018, pp. 950–957. Y. Wen, Á. Rentería-Gómez, G. S. Day, M. F. Smith, T.-H. Yan, R. O. K. Ozdemir, O. Gutierrez, V. K. Sharma, X. Ma, H.-C. Zhou, Integrated Photocatalytic Reduction and Oxidation of Perfluorooctanoic Acid by Metal-Organic Frameworks: Key Insights into the Degradation Mechanisms, Journal of the American Chemical Society, Vol.144, 2022, pp. 11840–11850. E. Y. Fernando, D. Sarkar, C. Rodwihok, A. Satpathy, J. Zhang, R. Rahmati, R. Datta, C. Christodoulatos, M. Boufadel, S. Larson, Z. Zhang, Unrefined and Milled Ilmenite as a Cost-Effective Photocatalyst for UV-Assisted Destruction and Mineralization of PFAS, Materials, Vol.17, 2024, 3801. J. Wang, S. Wang, Reactive Species in Advanced Oxidation Processes: Formation, Identification and Reaction Mechanism, Chemical Engineering Journal, Vol.401, 2020, 126158. G. Yu, Y. Wang, H. Cao, H. Zhao, Y. Xie, Reactive Oxygen Species and Catalytic Active Sites in Heterogeneous Catalytic Ozonation for Water Purification, Environmental Science & Technology, Vol.54, 2020, pp. 5931–5946. B. Xu, J. L. Zhou, A. Altaee, M. B. Ahmed, M. A. H. Johir, J. Ren, X. Li, Improved Photocatalysis of Perfluorooctanoic Acid in Water and Wastewater by Ga2O3/UV System Assisted by Peroxymonosulfate, Chemosphere, Vol.239, 2020, 124722. J. Wang, C. Cao, Y. Zhang, Y. Zhang, L. Zhu, Underneath Mechanisms into the Super Effective Degradation of PFOA by BiOF Nanosheets with Tunable Oxygen Vacancies on Exposed (101) Facets, Applied Catalysis B: Environment and Energy, Vol.286, 2021, 119911. M. Samy, M. G. Ibrahim, M. Fujii, K. E. Diab, M. ElKady, M. Gar Alalm, CNTs/MOF-808 Painted Plates for Extended Treatment of Pharmaceutical and Agrochemical Wastewaters in a Novel Photocatalytic Reactor, Chemical Engineering Journal, Vol.406, 2021, 127152. M. H. Cao, B. B. Wang, H. S. Yu, L. L. Wang, S. H. Yuan, J. Chen, Photochemical Decomposition of Perfluorooctanoic Acid in Aqueous Periodate with VUV and UV Light Irradiation, Journal of Hazardous Materials, Vol.179, 2010, pp. 1143–1146. Z. Li, P. Zhang, T. Shao, X. Li, In2O3 Nanoporous Nanosphere: A Highly Efficient Photocatalyst for Decomposition of Perfluorooctanoic Acid, Applied Catalysis B: Environment and Energy, Vol.125, 2012, pp. 350–357. X. Liu, W. Wei, J. Xu, D. Wang, L. Song, B.-J. Ni, Photochemical Decomposition of Perfluorochemicals in Contaminated Water, Water Research, Vol.186, 2020, 116311. Z. Song, H. Tang, N. Wang, L. Zhu, Reductive Defluorination of Perfluorooctanoic Acid by Hydrated Electrons in a Sulfite Mediated UV Photochemical System, Journal of Hazardous Materials, Vol.262, 2013, pp. 332–338. M. J. Bentel, Y. Yu, L. Xu, Z. Li, B. M. Wong, Y. Men, J. Liu, Defluorination of Per- and Polyfluoroalkyl Substances (PFASs) with Hydrated Electrons: Structural Dependence and Implications to PFAS Remediation and Management, Environmental Science & Technology, Vol.53, 2019, pp. 3718–3728. X. Li, P. Zhang, L. Jin, T. Shao, Z. Li, J. Cao, Efficient Photocatalytic Decomposition of Perfluorooctanoic Acid by Indium Oxide and Its Mechanism, Environmental Science & Technology, Vol.46, 2012, pp. 5528–5534. E. Banayan Esfahani, F. Asadi Zeidabadi, S. Zhang, M. Mohseni, Photo-Chemical/Catalytic Oxidative/Reductive Decomposition of Per- and Poly-Fluoroalkyl Substances (PFAS), Decomposition Mechanisms and Effects of Key Factors: A Review, Environmental Science: Water Research & Technology, Vol.8, 2022, pp. 698–728. L. Eberson, Electron-Transfer Reactions in Organic Chemistry, Advances in Physical Organic Chemistry, Vol.18, 1982, pp. 79–185. H. Zhang, C. Xie, L. Chen, J. Duan, F. Li, W. Liu, Different Reaction Mechanisms of SO4−2 ● and OH● with Organic Compound Interpreted at Molecular Orbital Level in Co(II)/Peroxymonosulfate Catalytic Activation System, Water Research, Vol.229, 2023, 119392. J. Wang, S. Wang, Activation of Persulfate (PS) and Peroxymonosulfate (PMS) and Application for the Degradation of Emerging Contaminants, Chemical Engineering Journal, Vol.334, 2018, pp. 1502–1517. F. C. Moreira, R. A. R. Boaventura, E. Brillas, V. J. P. Vilar, Electrochemical Advanced Oxidation Processes: A Review on Their Application to Synthetic and Real Wastewaters, Applied Catalysis B: Environment and Energy, Vol.202, 2017, pp. 217–261. D. Dey, T. Shafi, S. Chowdhury, B. Dubey, R. Sen, Progress and Perspectives on Carbon-Based Materials for Adsorptive Removal and Photocatalytic Degradation of Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS), Chemosphere, Vol.351, 2024, 141164.