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

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 Date: 25 September 2016
Revised Date: 23 October 2016

Fund Project: 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).

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.
- Photochemical,
- p-n heterojunction,
- Silver,
- Silver oxide,
- Bismuth orthovanadate,
- Microcystin-RR (MC-RR),
- Mechanism
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Photochemical oxidation mechanism of microcystin-RR by p-n heterojunction Ag/Ag₂O-BiVO₄