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Heterogeneous photocatalytic treatment of pharmaceutical micropollutants: Effects of wastewater effluent matrix and catalyst modifications

Title
Heterogeneous photocatalytic treatment of pharmaceutical micropollutants: Effects of wastewater effluent matrix and catalyst modifications
Authors
Choi, J[Choi, Jihyun]Lee, H[Lee, Hongshin]Choi, Y[Choi, Yeoseon]Kim, S[Kim, Soonhyun]Lee, S[Lee, Seokheon]Lee, S[Lee, Seunghak]Choi, W[Choi, Wonyong]Lee, J[Lee, Jaesang]
DGIST Authors
Kim, S[Kim, Soonhyun]
Issue Date
2014-04-05
Citation
Applied Catalysis B: Environmental, 147, 8-16
Type
Article
Article Type
Article
Keywords
BiogeochemistryBiological MaterialsEffluent TreatmentEffluentsFree RadicalsHeterogeneous Photocatalytic OxidationLight SourcesMicropollutantsOrganic CompoundsPharmaceutical MicropollutantsPhoto-Catalytic OxidationsPhoto-Catalytic PerformancePhoto-Catalytic TreatmentPhoto Catalytic DegradationPlatinumQuenchingQuenching ActivitySecondary Wastewater EffluentSurface ModificationSurface TreatmentTitanium DioxideVisible-Light-Active PhotocatalystVisible-Light ActivityWastewater Effluents
ISSN
0926-3373
Abstract
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) 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-mediated oxidation. © 2013.
URI
http://hdl.handle.net/20.500.11750/3100
DOI
10.1016/j.apcatb.2013.08.032
Publisher
Elsevier B.V.
Related Researcher
Files:
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Collection:
Smart Textile Convergence Research Group1. Journal Articles


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