Photocatalytic decomposition of five contaminants of emerging concerns (CECs), namely bisphenol A (BPA), ibuprofen (IBP), triclosan (TCS), diclofenac (DCF), and estrone (E1), by simulated solar light/N- and B-codoped TiO2 advanced oxidation process (AOP) was studied individually and in quinary system. Degradation experiments were conducted in different wastewater matrices spiked with the target contaminants. The wastewater samples were collected from different treatment stages at a water reuse system comprising treating effluent wastewater by a treatment train that included microfiltration, reverse osmosis, and other steps. The catalyst (2.0NBT-350) was hydrothermally synthesized at the optimum composition/experimental conditions (N+B:TiO2 “0.02:1.0” molar ratio, and 350 oC calcination temperature) following our previously published work (Abdelraheem et al. Applied Catalysis B: Environmental 2019, 241, 598-611). All contaminants encompassed negligible direct photolysis under simulated solar light irradiation, and marginal adsorption on the catalyst surface. Complete removals of contaminants (@1 µM initial concentration) in single degradation systems were achieved in about 60 min, while slight decreases in their removal ratios were noticed in the quinary degradation system at the same reaction time. Degradation of contaminants in quinary system were lower than those in individual degradation. HCO3−, Br− and NO3− showed inhibitive effects on the removal kinetics of all contaminants, except for the degradation of BPA and TCS that showed enhanced degradation in the presence of HCO3−. Cl− showed only pronounced inhibitive effect on the removal of E1, and no effect on other contaminants. Removal percentages of contaminants in reverse osmoses treated wastewater (RO) was higher than those achieved in highly contaminated wastewater matrices (i.e., secondary treated wastewater effluent “SWI” and microfiltration effluent “MF”).

Treatment of domestic wastewater by simulated solar-light mediated N- and B-codoped TiO2 AOP for reuse: Mechanistic aspects and implications of inorganic species

2019 Fall National Meeting

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