The transition of tetragonal to monoclinic phase in BiVO4 coupled with peroxymonosulfate for photocatalytic degradation of tetracycline hydrochloride

Cixin Cheng; Huihong Tan; Weiwei Zhu; Liu Lang; Chen Kao; Jun Yan

doi:10.1016/j.envres.2024.120631

The transition of tetragonal to monoclinic phase in BiVO₄ coupled with peroxymonosulfate for photocatalytic degradation of tetracycline hydrochloride

Environ Res. 2024 Dec 19:120631. doi: 10.1016/j.envres.2024.120631. Online ahead of print.

Authors

Cixin Cheng¹, Huihong Tan¹, Weiwei Zhu¹, Liu Lang¹, Chen Kao¹, Jun Yan²

Affiliations

¹ Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and New Technology for Carbon Neutralization, Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, School of materials and environment, Guangxi Minzu University, Nanning 530006, China.
² School of Chemistry and Chemical Engineering, Guangxi Minzu University. Nanning 530006 China.

PMID: 39709121
DOI: 10.1016/j.envres.2024.120631

Abstract

At present, the mechanism difference between tetragonal BiVO₄ (t-BiVO₄) and monoclinic BiVO₄ (m-BiVO₄) coupled peroxymonosulfate (PMS) to realize photocatalysis is still unclear. In this study, m-BiVO₄ and t-BiVO₄ were obtained by adjusting the bismuth-vanadium ratio in the precursor solution (Bi:V=3:1; 1:1; 1:2 and 1:3). The results of photocatalytic experiments showed that both t-BiVO₄ and m-BiVO₄ had certain activation effects on PMS, and the prepared monoclinic B1V2 has the strongest photocatalytic performance. Using 20 mg B1V2 to activate 4 mmol L^-1 PMS in 30 min, the degradation rate of tetracycline hydrochloride (TCH) reached 92.8%. The free radical quenching experiment and EPR test showed that when m-BiVO₄ coupled PMS degraded TCH, the contribution of active species was SO₄^•->•OH>•O₂^->h⁺. Compared with m-BiVO₄, the wide band gap of t-BiVO₄ makes the photogenerated carrier recombination. When t-BiVO₄ coupling PMS, the contribution of active species is •O₂^->SO₄^•->•OH>h⁺. In addition, the intermediate products of TCH degradation were analyzed by LC-MS, and three possible degradation paths of TCH were proposed.

Keywords: BiVO(4); Tetracycline hydrochloride; crystal phase regulation; peroxymonosulfate; photocatalysis.

Publication types

Letter