Comparison of Ag and AgI-Modified ZnO as Heterogeneous Photocatalysts for Simulated Sunlight Driven Photodegradation of Metronidazole

Ag and AgI-modified ZnO composites (Ag/ZnO and AgI/ZnO) were synthesized in facile ways. The photocatalysts were used for the photodegradation of metronidazole (MNZ) under the irradiation of simulated sunlight. The results of experiments showed that both Ag/ZnO and AgI/ZnO had a specific molar ratio...

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Main Authors:	Chao Ding, Kun Fu, Yishuai Pan, Jia Liu, Huiping Deng, Jun Shi
Format:	Article
Language:	English
Published:	MDPI AG 2020-09-01
Series:	Catalysts
Subjects:	Ag/ZnO and AgI/ZnO composite photocatalysts metronidazole reactive oxygen species
Online Access:	https://www.mdpi.com/2073-4344/10/9/1097

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spelling	doaj-498fdf0a56e0431897472c98fcfdd67a2020-11-25T03:41:58ZengMDPI AGCatalysts2073-43442020-09-01101097109710.3390/catal10091097Comparison of Ag and AgI-Modified ZnO as Heterogeneous Photocatalysts for Simulated Sunlight Driven Photodegradation of MetronidazoleChao Ding0Kun Fu1Yishuai Pan2Jia Liu3Huiping Deng4Jun Shi5Shanghai Institute of Pollution Control and Ecological Security, Key Laboratory of Yangtze River Water Environment Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, ChinaShanghai Institute of Pollution Control and Ecological Security, Key Laboratory of Yangtze River Water Environment Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, ChinaShanghai Institute of Pollution Control and Ecological Security, Key Laboratory of Yangtze River Water Environment Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, ChinaShanghai Institute of Pollution Control and Ecological Security, Key Laboratory of Yangtze River Water Environment Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, ChinaShanghai Institute of Pollution Control and Ecological Security, Key Laboratory of Yangtze River Water Environment Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, ChinaShanghai Institute of Pollution Control and Ecological Security, Key Laboratory of Yangtze River Water Environment Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, ChinaAg and AgI-modified ZnO composites (Ag/ZnO and AgI/ZnO) were synthesized in facile ways. The photocatalysts were used for the photodegradation of metronidazole (MNZ) under the irradiation of simulated sunlight. The results of experiments showed that both Ag/ZnO and AgI/ZnO had a specific molar ratio to reach the best performance. Ag/ZnO performed better in the photodegradation of MNZ than AgI/ZnO under the same conditions. The reaction rate constant of AgI/ZnO was less affected by the variation of initial concentration of MNZ or pH values. The main reactive oxygen species of the photocatalytic process are OH, O<sub>2</sub><sup>−</sup> and h<sup>+</sup>, but the free radicals which play the most critical part differ in Ag/ZnO and AgI/ZnO. Several intermediates were revealed by LC–MS/MS analysis. The stability of the photocatalysts was evaluated by a series of repeated MNZ photodegradation experiments. The results showed that AgI/ZnO had better stability than Ag/ZnO.https://www.mdpi.com/2073-4344/10/9/1097Ag/ZnO and AgI/ZnOcomposite photocatalystsmetronidazolereactive oxygen species
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Chao Ding Kun Fu Yishuai Pan Jia Liu Huiping Deng Jun Shi
spellingShingle	Chao Ding Kun Fu Yishuai Pan Jia Liu Huiping Deng Jun Shi Comparison of Ag and AgI-Modified ZnO as Heterogeneous Photocatalysts for Simulated Sunlight Driven Photodegradation of Metronidazole Catalysts Ag/ZnO and AgI/ZnO composite photocatalysts metronidazole reactive oxygen species
author_facet	Chao Ding Kun Fu Yishuai Pan Jia Liu Huiping Deng Jun Shi
author_sort	Chao Ding
title	Comparison of Ag and AgI-Modified ZnO as Heterogeneous Photocatalysts for Simulated Sunlight Driven Photodegradation of Metronidazole
title_short	Comparison of Ag and AgI-Modified ZnO as Heterogeneous Photocatalysts for Simulated Sunlight Driven Photodegradation of Metronidazole
title_full	Comparison of Ag and AgI-Modified ZnO as Heterogeneous Photocatalysts for Simulated Sunlight Driven Photodegradation of Metronidazole
title_fullStr	Comparison of Ag and AgI-Modified ZnO as Heterogeneous Photocatalysts for Simulated Sunlight Driven Photodegradation of Metronidazole
title_full_unstemmed	Comparison of Ag and AgI-Modified ZnO as Heterogeneous Photocatalysts for Simulated Sunlight Driven Photodegradation of Metronidazole
title_sort	comparison of ag and agi-modified zno as heterogeneous photocatalysts for simulated sunlight driven photodegradation of metronidazole
publisher	MDPI AG
series	Catalysts
issn	2073-4344
publishDate	2020-09-01
description	Ag and AgI-modified ZnO composites (Ag/ZnO and AgI/ZnO) were synthesized in facile ways. The photocatalysts were used for the photodegradation of metronidazole (MNZ) under the irradiation of simulated sunlight. The results of experiments showed that both Ag/ZnO and AgI/ZnO had a specific molar ratio to reach the best performance. Ag/ZnO performed better in the photodegradation of MNZ than AgI/ZnO under the same conditions. The reaction rate constant of AgI/ZnO was less affected by the variation of initial concentration of MNZ or pH values. The main reactive oxygen species of the photocatalytic process are OH, O<sub>2</sub><sup>−</sup> and h<sup>+</sup>, but the free radicals which play the most critical part differ in Ag/ZnO and AgI/ZnO. Several intermediates were revealed by LC–MS/MS analysis. The stability of the photocatalysts was evaluated by a series of repeated MNZ photodegradation experiments. The results showed that AgI/ZnO had better stability than Ag/ZnO.
topic	Ag/ZnO and AgI/ZnO composite photocatalysts metronidazole reactive oxygen species
url	https://www.mdpi.com/2073-4344/10/9/1097
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Comparison of Ag and AgI-Modified ZnO as Heterogeneous Photocatalysts for Simulated Sunlight Driven Photodegradation of Metronidazole

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