International Journal on Applied Physics and Engineering
E-ISSN: 2945-0489
Volume 1, 2022
Treatment of Hydrophobic Polycyclic Aromatic Hydrocarbons and Toxicity Using GO-TiO2-Sr(OH)2/SrCO3 Nanocomposite via Photocatalytic Degradation
Authors: ,
Abstract: In this study, the effects of increasing sun light irradiation time (30 min, 120 min, 240 min and 360 min), increasing photocatalytic power (10 W, 50 W and 100 W), increasing graphene oxide (GO) nanoparticle concentrations (2 mg/l, 4 mg/l and 8 mg/l), increasing titanium dioxide ($$TiO_{2}$$) nanoparticle concentrations (1 mg/l, 3 mg/l, 6 mg/l and 9 mg/l), increasing $$GO-TiO_{2}-Sr(OH)_{2}/SrCO_{3}$$ nanocomposite concentrations (1 mg/l, 2 mg/l and 4 mg/l) on the destructions of four hydrophobic polycyclic aromatic hydrocarbons (PAHs) in a real petrochemical industry wastewater in Izmir (Turkey) were investigated. The yields in more hydrophobic PAHs with high benzene rings [benzo[a]pyrene (BaP) and benzo[k]fluoranthene (BkF)] were as high as the less hydrophobic PAHs with lower benzene rings [acenaphthylene (ACL) and carbazole (CRB)]; at pH=7.0, at 22oC after 360 min sun light irradiation time, respectively. Maximum 97%ACL, 98%CRB, 98%BaP and 99%BkF PAHs removals was detected at 4 mg/l $$GO-TiO_{2}-Sr(OH)_{2}/SrCO_{3}$$ nanocomposite concentration, under 100 mW/cm2 sun light intensity, at 100 W photocatalytic power, at 360 min sun light irradiation time, at pH=7.0 and at 22oC, respectively. The effective PAHs concentrations caused 50% mortality in Daphnia magna cells increased from initial $$EC_{50}=342.56 mg/l$$ to $$EC_{50}=631.05 mg/l$$, at pH=7.0 and at 22oC after 360 min photocatalytic degradation time resulting in a maximum acute toxicity removal of 99.99%, at 4 mg/l $$GO-TiO_{2}-Sr(OH)_{2}/SrCO_{3}$$ nanocomposite concentration. The Daphnia magna acute toxicity was significantly reduced.
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Keywords: Daphnia magna acute toxicity, graphene oxide, $$GO-TiO_{2}-Sr(OH)_{2}/SrCO_{3}$$ nanocomposite, petrochemical industry wastewater, photocatalytic degradation, polycyclic aromatic hydrocarbons, titanium dioxide
Pages: 60-83
DOI: 10.37394/232030.2022.1.8