Degradation of Chloramphenicol Using UV-LED Based Advanced Oxidation Processes: Kinetics, Mechanisms, and Enhanced Formation of Disinfection By-Products

As an emerging light source, ultraviolet light emitting diodes (UV-LEDs) are adopted to overcome the shortcomings of the conventional mercury lamp, such as mercury pollution. The degradation of chloramphenicol (CAP) using three UV-LED-based advanced oxidation processes (AOPs)—UV-LED/persulfate (UV-L...

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Autores principales:	Xinlu Qu, Haowei Wu, Tianyang Zhang, Qianhong Liu, Mu Wang, Mohamed Yateh, Yulin Tang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	chloramphenicol advanced oxidation processes UV-LED Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
Acceso en línea:	https://doaj.org/article/97ce1b0f1abd4369b9229d57946e722f
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spelling	oai:doaj.org-article:97ce1b0f1abd4369b9229d57946e722f2021-11-11T19:55:22ZDegradation of Chloramphenicol Using UV-LED Based Advanced Oxidation Processes: Kinetics, Mechanisms, and Enhanced Formation of Disinfection By-Products10.3390/w132130352073-4441https://doaj.org/article/97ce1b0f1abd4369b9229d57946e722f2021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4441/13/21/3035https://doaj.org/toc/2073-4441As an emerging light source, ultraviolet light emitting diodes (UV-LEDs) are adopted to overcome the shortcomings of the conventional mercury lamp, such as mercury pollution. The degradation of chloramphenicol (CAP) using three UV-LED-based advanced oxidation processes (AOPs)—UV-LED/persulfate (UV-LED/PS), UV-LED/peroxymonosulfate (UV-LED/PMS) and UV-LED/chlorine—was investigated. Results indicate that CAP can be more effectively degraded by the hybrid processes when compared to UV irradiation and oxidants alone. Degradation of CAP using the three UV-LED-based AOPs followed pseudo-first-order kinetics. The degradation rate constants (k<sub>obs</sub>) for UV-LED/PS, UV-LED/PMS, and UV-LED/chlorine were 0.0522, 0.0437 and 0.0523 min<sup>−1</sup>, and the CAP removal rates 99%, 98.1% and 96.3%, respectively. The degradation rate constant (k<sub>obs</sub>) increased with increasing oxidant dosage for UV-LED/chlorine, whereas overdosing reduced CAP degradation using UV-LED/PS and UV-LED/PMS. Ultraviolet wavelength influenced degradation efficiency of the UV-LED based AOPs with maximum CAP degradation observed at a wavelength of 280 nm. The application of UV-LED enhanced the formation DBPs during subsequent chlorination. uUV-LED/PMS produced more disinfection by-products than UV-LED/PS. Compared to UV-LED, UV-LED/PS reduced the formation of dichloroacetonitrile and trichloronitromethane during chlorination owing to its capacity to degrade the nitro group in CAP. The intermediates dichloroacetamide, 4-nitrobenzoic acid, 4-nitrophenol were produced during the degradation of CAP using each of UV-LED, UV-LED/PS and UV-LED/chlorine. The present study provides further evidence supporting the application of UV-LED in AOPs.Xinlu QuHaowei WuTianyang ZhangQianhong LiuMu WangMohamed YatehYulin TangMDPI AGarticlechloramphenicoladvanced oxidation processesUV-LEDHydraulic engineeringTC1-978Water supply for domestic and industrial purposesTD201-500ENWater, Vol 13, Iss 3035, p 3035 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	chloramphenicol advanced oxidation processes UV-LED Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
spellingShingle	chloramphenicol advanced oxidation processes UV-LED Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 Xinlu Qu Haowei Wu Tianyang Zhang Qianhong Liu Mu Wang Mohamed Yateh Yulin Tang Degradation of Chloramphenicol Using UV-LED Based Advanced Oxidation Processes: Kinetics, Mechanisms, and Enhanced Formation of Disinfection By-Products
description	As an emerging light source, ultraviolet light emitting diodes (UV-LEDs) are adopted to overcome the shortcomings of the conventional mercury lamp, such as mercury pollution. The degradation of chloramphenicol (CAP) using three UV-LED-based advanced oxidation processes (AOPs)—UV-LED/persulfate (UV-LED/PS), UV-LED/peroxymonosulfate (UV-LED/PMS) and UV-LED/chlorine—was investigated. Results indicate that CAP can be more effectively degraded by the hybrid processes when compared to UV irradiation and oxidants alone. Degradation of CAP using the three UV-LED-based AOPs followed pseudo-first-order kinetics. The degradation rate constants (k<sub>obs</sub>) for UV-LED/PS, UV-LED/PMS, and UV-LED/chlorine were 0.0522, 0.0437 and 0.0523 min<sup>−1</sup>, and the CAP removal rates 99%, 98.1% and 96.3%, respectively. The degradation rate constant (k<sub>obs</sub>) increased with increasing oxidant dosage for UV-LED/chlorine, whereas overdosing reduced CAP degradation using UV-LED/PS and UV-LED/PMS. Ultraviolet wavelength influenced degradation efficiency of the UV-LED based AOPs with maximum CAP degradation observed at a wavelength of 280 nm. The application of UV-LED enhanced the formation DBPs during subsequent chlorination. uUV-LED/PMS produced more disinfection by-products than UV-LED/PS. Compared to UV-LED, UV-LED/PS reduced the formation of dichloroacetonitrile and trichloronitromethane during chlorination owing to its capacity to degrade the nitro group in CAP. The intermediates dichloroacetamide, 4-nitrobenzoic acid, 4-nitrophenol were produced during the degradation of CAP using each of UV-LED, UV-LED/PS and UV-LED/chlorine. The present study provides further evidence supporting the application of UV-LED in AOPs.
format	article
author	Xinlu Qu Haowei Wu Tianyang Zhang Qianhong Liu Mu Wang Mohamed Yateh Yulin Tang
author_facet	Xinlu Qu Haowei Wu Tianyang Zhang Qianhong Liu Mu Wang Mohamed Yateh Yulin Tang
author_sort	Xinlu Qu
title	Degradation of Chloramphenicol Using UV-LED Based Advanced Oxidation Processes: Kinetics, Mechanisms, and Enhanced Formation of Disinfection By-Products
title_short	Degradation of Chloramphenicol Using UV-LED Based Advanced Oxidation Processes: Kinetics, Mechanisms, and Enhanced Formation of Disinfection By-Products
title_full	Degradation of Chloramphenicol Using UV-LED Based Advanced Oxidation Processes: Kinetics, Mechanisms, and Enhanced Formation of Disinfection By-Products
title_fullStr	Degradation of Chloramphenicol Using UV-LED Based Advanced Oxidation Processes: Kinetics, Mechanisms, and Enhanced Formation of Disinfection By-Products
title_full_unstemmed	Degradation of Chloramphenicol Using UV-LED Based Advanced Oxidation Processes: Kinetics, Mechanisms, and Enhanced Formation of Disinfection By-Products
title_sort	degradation of chloramphenicol using uv-led based advanced oxidation processes: kinetics, mechanisms, and enhanced formation of disinfection by-products
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/97ce1b0f1abd4369b9229d57946e722f
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Degradation of Chloramphenicol Using UV-LED Based Advanced Oxidation Processes: Kinetics, Mechanisms, and Enhanced Formation of Disinfection By-Products

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