Enhanced ronidazole degradation by UV-LED/chlorine compared with conventional low-pressure UV/chlorine at neutral and alkaline pH values
Copyright © 2019 Elsevier Ltd. All rights reserved..
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.
| Medienart: |
E-Artikel |
|---|
| Erscheinungsjahr: |
2019 |
|---|---|
| Erschienen: |
2019 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:160 |
|---|---|
| Enthalten in: |
Water research - 160(2019) vom: 01. Sept., Seite 296-303 |
| Sprache: |
Englisch |
|---|
| Beteiligte Personen: |
Zou, Xiang-Yun [VerfasserIn] |
|---|
| Links: |
|---|
| Anmerkungen: |
Date Completed 06.11.2019 Date Revised 06.11.2019 published: Print-Electronic Citation Status MEDLINE |
|---|
| doi: |
10.1016/j.watres.2019.05.072 |
|---|
| funding: |
|
|---|---|
| Förderinstitution / Projekttitel: |
|
| PPN (Katalog-ID): |
NLM297718010 |
|---|
| LEADER | 01000naa a22002652 4500 | ||
|---|---|---|---|
| 001 | NLM297718010 | ||
| 003 | DE-627 | ||
| 005 | 20231225092612.0 | ||
| 007 | cr uuu---uuuuu | ||
| 008 | 231225s2019 xx |||||o 00| ||eng c | ||
| 024 | 7 | |a 10.1016/j.watres.2019.05.072 |2 doi | |
| 028 | 5 | 2 | |a pubmed24n0992.xml |
| 035 | |a (DE-627)NLM297718010 | ||
| 035 | |a (NLM)31154127 | ||
| 035 | |a (PII)S0043-1354(19)30460-9 | ||
| 040 | |a DE-627 |b ger |c DE-627 |e rakwb | ||
| 041 | |a eng | ||
| 100 | 1 | |a Zou, Xiang-Yun |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Enhanced ronidazole degradation by UV-LED/chlorine compared with conventional low-pressure UV/chlorine at neutral and alkaline pH values |
| 264 | 1 | |c 2019 | |
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a ƒaComputermedien |b c |2 rdamedia | ||
| 338 | |a ƒa Online-Ressource |b cr |2 rdacarrier | ||
| 500 | |a Date Completed 06.11.2019 | ||
| 500 | |a Date Revised 06.11.2019 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a Copyright © 2019 Elsevier Ltd. All rights reserved. | ||
| 520 | |a 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 | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Advanced oxidation/reduction processes (AO/RPs) | |
| 650 | 4 | |a Chlorine photolysis | |
| 650 | 4 | |a Ronidazole (RNZ) | |
| 650 | 4 | |a UV/Chlorine | |
| 650 | 4 | |a Ultraviolet light-emitting diode (UV-LED) | |
| 650 | 7 | |a Water Pollutants, Chemical |2 NLM | |
| 650 | 7 | |a Chlorine |2 NLM | |
| 650 | 7 | |a 4R7X1O2820 |2 NLM | |
| 650 | 7 | |a Ronidazole |2 NLM | |
| 650 | 7 | |a E01R4M1063 |2 NLM | |
| 700 | 1 | |a Lin, Yi-Li |e verfasserin |4 aut | |
| 700 | 1 | |a Xu, Bin |e verfasserin |4 aut | |
| 700 | 1 | |a Zhang, Tian-Yang |e verfasserin |4 aut | |
| 700 | 1 | |a Hu, Chen-Yan |e verfasserin |4 aut | |
| 700 | 1 | |a Cao, Tong-Cheng |e verfasserin |4 aut | |
| 700 | 1 | |a Chu, Wen-Hai |e verfasserin |4 aut | |
| 700 | 1 | |a Pan, Yang |e verfasserin |4 aut | |
| 700 | 1 | |a Gao, Nai-Yun |e verfasserin |4 aut | |
| 773 | 0 | 8 | |i Enthalten in |t Water research |d 1990 |g 160(2019) vom: 01. Sept., Seite 296-303 |w (DE-627)NLM111404762 |x 1879-2448 |7 nnns |
| 773 | 1 | 8 | |g volume:160 |g year:2019 |g day:01 |g month:09 |g pages:296-303 |
| 856 | 4 | 0 | |u http://dx.doi.org/10.1016/j.watres.2019.05.072 |3 Volltext |
| 912 | |a GBV_USEFLAG_A | ||
| 912 | |a GBV_NLM | ||
| 951 | |a AR | ||
| 952 | |d 160 |j 2019 |b 01 |c 09 |h 296-303 | ||