Cheng Cixin, Tan Huihong, Zhu Weiwei, Liu Lang, Chen Kao, Yan Jun
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.
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.
Environ Res. 2025 Feb 15;267:120631. doi: 10.1016/j.envres.2024.120631. Epub 2024 Dec 19.
At present, the mechanism difference between tetragonal BiVO (t-BiVO) and monoclinic BiVO (m-BiVO) coupled peroxymonosulfate (PMS) to realize photocatalysis is still unclear. In this study, m-BiVO and t-BiVO 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-BiVO and m-BiVO 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 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-BiVO coupled PMS degraded TCH, the contribution of active species was SO>•OH>•O > h. Compared with m-BiVO, the wide band gap of t-BiVO makes the photogenerated carrier recombination. When t-BiVO coupling PMS, the contribution of active species is •O > SO>•OH>h. In addition, the intermediate products of TCH degradation were analyzed by LC-MS, and three possible degradation paths of TCH were proposed.
目前，四方相BiVO（t-BiVO）和单斜相BiVO（m-BiVO）耦合过一硫酸盐（PMS）实现光催化的机理差异仍不清楚。在本研究中，通过调节前驱体溶液中的铋钒比（Bi:V = 3:1；1:1；1:2和1:3）获得了m-BiVO和t-BiVO。光催化实验结果表明，t-BiVO和m-BiVO对PMS均有一定的活化作用，且制备的单斜相B1V2具有最强的光催化性能。使用20 mg B1V2在30分钟内活化4 mmol L PMS，盐酸四环素（TCH）的降解率达到92.8%。自由基猝灭实验和电子顺磁共振测试表明，当m-BiVO耦合PMS降解TCH时，活性物种的贡献为SO>•OH>•O>h。与m-BiVO相比，t-BiVO的宽带隙使得光生载流子复合。当t-BiVO耦合PMS时，活性物种的贡献为•O>SO>•OH>h。此外，通过液相色谱-质谱联用仪分析了TCH降解的中间产物，并提出了TCH的三种可能降解途径。
