Zhong Xin, Wu Wen-Ting, Jie Hao-Nan, Tang Wang-Ye, Chen Dan-Yan, Ruan Tao, Bai He-Ping
Department of Environmental Engineering and Science, Beijing Normal University Zhuhai China
College of Education for the Future, Beijing Normal University at Zhuhai Zhuhai China.
RSC Adv. 2020 Oct 15;10(62):38024-38032. doi: 10.1039/d0ra07378d. eCollection 2020 Oct 12.
In this work, a series of Cu(ii)-doped BiWO nanomaterials with good photo-response properties were facile synthesized and used to obtain efficient peroxymonosulfate (PMS) activation activity for norfloxacin (NOF) removal under visible LED light irradiation. It was found that Cu-BiWO presents superior catalytic performance for NOF degradation in comparison with pristine BiWO, attributed to the partial substitution of Bi by Cu ions. Moreover, the effects of experimental conditions were carefully investigated, including PMS concentration, catalyst dosage and initial pH, and the experimental data fitted well with the pseudo-first-order model. Experimental results implied that there was a synergic effect of visible LED light energy and the sulfate radical (SR)-Fenton reaction. Additionally, the 5Cu-BiWO nanomaterial presented the best degradation efficiency of 89.27% and exhibited high NOF degradation in 5 cycles with limited Cu leaching. Furthermore, EPR and radical quenching experiments were performed to identify the reactive oxygen species presented in the SR-photo-Fenton reaction. Finally, the major degradation intermediates of NOF were detected, and a possible degradation pathway was given. Thus, a mechanism of the significant photocatalytic activity enhancement by copper doping of the BiWO catalyst was proposed.
在这项工作中，一系列具有良好光响应性能的铜（II）掺杂铋钨纳米材料被简便合成，并用于在可见光发光二极管（LED）照射下获得用于去除诺氟沙星（NOF）的高效过一硫酸盐（PMS）活化活性。研究发现，与原始的铋钨相比，铜掺杂铋钨对NOF降解具有优异的催化性能，这归因于铜离子对铋的部分取代。此外，还仔细研究了实验条件的影响，包括PMS浓度、催化剂用量和初始pH值，实验数据与准一级模型拟合良好。实验结果表明，可见光LED光能与硫酸根自由基（SR）-芬顿反应存在协同效应。此外，5%铜掺杂铋钨纳米材料表现出最佳降解效率，为89.27%，并在5次循环中表现出高NOF降解率且铜浸出有限。此外，进行了电子顺磁共振（EPR）和自由基猝灭实验，以确定SR-光芬顿反应中存在的活性氧物种。最后，检测了NOF的主要降解中间体，并给出了可能的降解途径。因此，提出了一种通过铋钨催化剂铜掺杂显著增强光催化活性的机理。
