Photochemical oxidation mechanism of microcystin-RR by p-n heterojunction Ag/Ag2O-BiVO4

doi:10.1016/S1872-2067(16)62583-4

Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (2): 192-198.DOI: 10.1016/S1872-2067(16)62583-4

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Photochemical oxidation mechanism of microcystin-RR by p-n heterojunction Ag/Ag₂O-BiVO₄

Chunhong Wu^a,b,c,d, Yanfen Fang^a,b,c, Araya Hailu Tirusew^b,c, Miaomiao Xiang^a,b,c, Yingping Huang^b,c, Chuncheng Chen^b,c

a College of biology and pharmacy, China Three Gorges University, Yichang 443002, Hubei, China;
b Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area, Yichang 443002, Hubei, China;
c Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, Hubei, China;
d Medical College of China Three Gorges University, Yichang 443002, Hubei, China

Received:2016-09-25 Revised:2016-10-23 Online:2017-02-18 Published:2017-03-14
Contact: 10.1016/S1872-2067(16)62583-4
Supported by:
This work was supported by the National Natural Science Foundation of China (21677086, 21407092, 21377067, 21577078) and the Natural Science Foundation for Innovation Group of Hubei Province, China (2015CFA021).

Abstract

Abstract:

Microcystin-RR (MC-RR), a form of microcystin with two arginine moieties, is a cyanobacterial toxin that has been detected across a wide geographic range. It is a great concern globally because of its potential liver toxicity. Herein, the abilities of BiVO₄, Ag-BiVO₄, Ag₂O-BiVO₄ and Ag/Ag₂O-BiVO₄ to photocatalytically degrade MC-RR under visible-light irradiation (λ≥420 nm) were investigated and compared. The possible degradation pathways were explored through analysis of the reaction intermediates by high-performance liquid chromatography-mass spectrometry. The results showed that the presence of Ag⁰ enhanced the photocatalytic efficiency of Ag/Ag₂O-BiVO₄ via a synergetic effect between Ag₂O and Ag⁰ at the p-n heterojunction. Moreover, the presence of Ag⁰ also greatly promoted the adsorption of MC-RR on the photocatalyst surface. Toxicological experiments on mice showed that the toxicity of MC-RR was significantly reduced after photocatalytic degradation.

Key words: Photochemical, p-n heterojunction, Silver, Silver oxide, Bismuth orthovanadate, Microcystin-RR (MC-RR), Mechanism

Chunhong Wu, Yanfen Fang, Araya Hailu Tirusew, Miaomiao Xiang, Yingping Huang, Chuncheng Chen. Photochemical oxidation mechanism of microcystin-RR by p-n heterojunction Ag/Ag₂O-BiVO₄[J]. Chinese Journal of Catalysis, 2017, 38(2): 192-198.

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Photochemical oxidation mechanism of microcystin-RR by p-n heterojunction Ag/Ag₂O-BiVO₄

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