Enhanced ronidazole degradation by UV-LED/chlorine compared with conventional low-pressure UV/chlorine at neutral and alkaline pH values.

Chlorine Hydrogen-Ion Concentration Oxidation-Reduction Ronidazole Ultraviolet Rays Water Pollutants, Chemical Water Purification
Advanced oxidation/reduction processes (AO/RPs) Chlorine photolysis Ronidazole (RNZ) UV/Chlorine Ultraviolet light-emitting diode (UV-LED)

Journal

Water research
ISSN: 1879-2448
Titre abrégé: Water Res
Pays: England
ID NLM: 0105072

Informations de publication

Date de publication:
01 Sep 2019
Historique:
received: 30 01 2019
revised: 14 05 2019
accepted: 22 05 2019
pubmed: 4 6 2019
medline: 7 11 2019
entrez: 3 6 2019
Statut: ppublish

Résumé

Ultraviolet light-emitting diodes (UV-LEDs) are promising alternatives to conventional low-pressure UV (LPUV) lamps, mainly because they contain no toxic mercury and have a potential for less energy consumption and longer lifetime. In this study, UV sources including UV-LEDs (265, 275 and 285 nm) and LPUV (254 nm) were compared in UV/chlorine degradation of an organic contaminant, ronidazole (RNZ). UV-LED/chlorine performed better than LPUV/chlorine at neutral and alkaline pH values for RNZ degradation considering the fluence-based rate constant. However, the wall plug efficiencies of UV-LEDs are relatively low at present and must reach about 20-25% to achieve the same electrical energy per order as the LPUV in UV/chlorine degradation of RNZ at pH 7.5 and 9. Neither the contribution of radical (HO· or Cl·) nor the quantum yield of chlorine could explain the different RNZ degradation rate by UV/chlorine at different wavelengths and pH values, while the chlorine photolysis rate should be the key factor for these phenomena. The effects of common co-existing substances in real water (chloride, bicarbonate and natural organic matter) on UV/chlorine degradation of RNZ were similar at different UV wavelengths. Opposite to other oxidants or reductants, the molar absorption coefficient of chlorine increases when the UV wavelength increases from 254 to 285 nm at neutral and alkaline pH, which makes UV-LED/chlorine one of the best choices for UV-LED-based advanced oxidation/reduction processes.

Identifiants

DOI: 10.1016/j.watres.2019.05.072 PMID: 31154127
pubmed: 31154127
pii: S0043-1354(19)30460-9
doi: 10.1016/j.watres.2019.05.072
pii:
doi:

Substances chimiques

Water Pollutants, Chemical 0
Chlorine 4R7X1O2820
Ronidazole E01R4M1063

Types de publication

Journal Article

Langues

eng

Sous-ensembles de citation

IM

Pagination

296-303

Informations de copyright

Copyright © 2019 Elsevier Ltd. All rights reserved.

Auteurs

Xiang-Yun Zou (XY)

State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, PR China.

Yi-Li Lin (YL)

Department of Safety, Health and Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, 824, Taiwan, ROC.

Bin Xu (B)

State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, PR China. Electronic address: tjwenwu@tongji.edu.cn.

Tian-Yang Zhang (TY)

State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, PR China.

Chen-Yan Hu (CY)

College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai, 200090, PR China.

Tong-Cheng Cao (TC)

School of Chemical Science and Engineering, Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai, 200092, PR China.

Wen-Hai Chu (WH)

State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, PR China.

Yang Pan (Y)

State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, PR China.

Nai-Yun Gao (NY)

State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China.

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Classifications MeSH

questionsmedicales.fr › Produits chimiques inorganiques › Gaz › Chlore › Enhanced ronidazole degradation by...
questionsmedicales.fr › Phénomènes chimiques › Concentration en ions d'hydrogène › Enhanced ronidazole degradation by...
questionsmedicales.fr › Métabolisme › Métabolisme énergétique › Oxydoréduction › Enhanced ronidazole degradation by...
questionsmedicales.fr › Composés hétérocycliques › Composés hétéromonocycliques › Azoles › Imidazoles › Nitroimidazoles › Ronidazole › Enhanced ronidazole degradation by...
questionsmedicales.fr › Environnement et santé publique › Environnement › Concepts météorologiques › Atmosphère › Temps (météorologie) › Lumière du soleil › Rayons ultraviolets › Enhanced ronidazole degradation by...
questionsmedicales.fr › Actions chimiques et utilisations › Actions toxiques › Polluants environnementaux › Polluants de l'eau › Polluants chimiques de l'eau › Enhanced ronidazole degradation by...
questionsmedicales.fr › Environnement et santé publique › Santé publique › Amélioration du niveau sanitaire › Génie sanitaire › Gestion des déchets › Purification de l'eau › Enhanced ronidazole degradation by...