Breaking interfacial charge transfer barrier by sulfite for efficient pollutants degradation: a case of BiVO4

npj Clean Water

Article

Peifang Wang¹  Xin Gao¹  Wei Liu¹  Huinan Che¹  Yanhui Ao¹ 

[1] Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1, Xikang road, 210098, Nanjing, China;

关键词: ;   

DOI  :  10.1038/s41545-023-00254-w

 received in 2022-12-31, accepted in 2023-05-02,  发布年份 2023

来源: Springer

【 摘 要 】

Heterogeneous photocatalytic systems generally lack thermodynamic dependence on the degradation of organic pollutants in aqueous solution. Therefore, it is important to reveal the reasons for the inhibited surface kinetics but still be neglected. Herein, we reveal the mechanism that BiVO4 can’t degrade organics although it is thermodynamically feasible. The surface solvation and formation of double layer (compact layer and diffuse layer) makes low-polarity organics far away from the surface of BiVO4. We found that the introduction of sulfite can solve this problem. Theory calculation illustrates that sulfite can enter into the compact layer because of its higher adsorption energy on BiVO4 and lower adiabatic ionization potential (AIP). Then, photogenerated holes initiate the chain transformation of sulfite and produce strong oxidizing species which can diffuse out to degrade organics. This paper provides an insight into the understand the effects of solid-liquid interface on heterogeneously photocatalytic degradation of organic pollutants.

【 授权许可】

CC BY   
© The Author(s) 2023

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