Choi, Jihyun Lee, Hongshin Choi, Yeoseon Kim, Soonhyun Lee, Seokheon Lee, Seunghak Choi, Wonyong Lee, Jaesang 2024-01-20T10:01:56Z 2024-01-20T10:01:56Z 2021-09-04 2014-04-05 0926-3373 https://pubs.kist.re.kr/handle/201004/126886 This study evaluates the applicability of TiO2-based photocatalysts for the treatment of pharmaceutical micropollutants in secondary wastewater effluent (SWE). Photolytic experiments using SWEs with different compositions demonstrated that the rates of photocatalytic degradation of acetaminophen and carbamazepine inversely correlated with the concentration of dissolved organic carbon (DOC), regardless of the type of applied light source and initial pharmaceutical concentration. The critical relevance of organic matter to the scavenging behavior of SWE was further verified by assessing the photocatalytic performance as a function of the concentrations of potential effluent-derived quenchers (i.e., NO3-, Cl-, alkalinity, and humic acid). Kinetic comparison of the degradation of trace levels of pharmaceuticals (i.e., caffeine, cimetidine, propranolol, and sulfamethoxazole) using TiO2/UV-A, TiO2/UV-C, and H2O2/UV-C systems revealed that heterogeneous processes showed more significant performance reduction with increasing DOC concentration; this result indicates that organic matter plays dual roles in the scavenging activity of an effluent matrix: (1) OH radical ((OH)-O-center dot) quenching and (2) active-site coverage. TiO2 surface modifications (i.e., Pt and SiOx loading) accelerated the degradation of all the tested pharmaceuticals in SWEs to a certain degree. Particularly, the relevant altered surface affinity preferentially increased the susceptibility of specific pharmaceuticals to photocatalytic treatment. The presence of the effluent matrix substantially impaired the performance of visible-light-active photocatalysts in most cases. However, photocatalytic pharmaceutical degradation on Pt-doped TiO2, which occurs via direct charge transfer, was much less hindered in SWEs than that on Pt-deposited WO3, which occurs via (OH)-O-center dot-mediated oxidation. (C) 2013 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV ADVANCED OXIDATION PROCESSES VISIBLE-LIGHT TIO2 PHOTOCATALYSIS ORGANIC-COMPOUNDS AQUEOUS-SOLUTION DEGRADATION FENTON OZONATION REMOVAL BIODEGRADABILITY Heterogeneous photocatalytic treatment of pharmaceutical micropollutants: Effects of wastewater effluent matrix and catalyst modifications Article 10.1016/j.apcatb.2013.08.032 1 APPLIED CATALYSIS B-ENVIRONMENTAL, v.147, pp.8 - 16 APPLIED CATALYSIS B-ENVIRONMENTAL 147 8 16 scie scopus 000330489400002 2-s2.0-84883753435 Chemistry, Physical Engineering, Environmental Engineering, Chemical Chemistry Engineering Article ADVANCED OXIDATION PROCESSES VISIBLE-LIGHT TIO2 PHOTOCATALYSIS ORGANIC-COMPOUNDS AQUEOUS-SOLUTION DEGRADATION FENTON OZONATION REMOVAL BIODEGRADABILITY Heterogeneous photocatalytic oxidation Pharmaceutical micropollutants Secondary wastewater effluent Quenching activity Surface modification Visible light activity