摘要
采用溶胶凝胶-碳热还原法制备3C-SiC,通过水热法合成Bi VO_(4)/SiC复合材料.构建Vis+BiVO_(4)/SiC+PMS体系降解CIP,在最佳实验条件下:1.0-Bi VO_(4)/SiC投加量为300mg/L、PMS浓度为2mmol/L、反应初始pH值为7时,40min时CIP的降解率为93.63%,反应速率常数k为0.05456min-1,分别是单独加入Bi VO_(4)和SiC的3.34和3.27倍.通过SEM、XRD、XPS、UV-Vis DRS及电化学工作站等方式对催化剂进行表征,Bi VO_(4)/Si C优异的光催化性能归因于形成的Z型异质结能够促进电子-空穴对分离的同时,保留催化剂高氧化还原性.因此,BiVO_(4)/SiC形成的Z型异质结能有效的促进PMS的活化,生成更多的活性物种,从而加速了CIP的降解过程.通过自由基的猝灭实验,确定体系中的活性物种为h+、1O_(2)、·O_(2)-、·OH、SO_(4)·-,通过自由基和非自由基的共同作用实现CIP的高效降解.最后,催化剂经过5次循环使用,CIP的降解率仍保持在89.49%.本文的研究成果不仅为光催化剂活化PMS提出新的解决方案,还能成功应用于抗生素的高效降解,为水体中有机污染物的治理提供一种新思路.
3C-SiC was synthesized via the sol-gel carbothermal reduction method,and BiVO_(4)/SiC composites were prepared using a hydrothermal approach.The Vis+BiVO_(4)/SiC+PMS system was constructed for the degradation of CIP.Under optimized conditions,1.0-BiVO_(4)/SiC was added with a dosage of 300mg/L,PMS concentration of 2mmol/L,and initial pH of the reaction of 7—the system achieved a 93.63%CIP degradation rate within 40minutes,with the k of 0.05456min-1.These values represented 3.34 times and 3.27 times enhancement compared to BiVO_(4) and SiC,respectively.The catalyst was characterized by SEM,XRD,XPS,UV-Vis DRS and electrochemical workstation.The excellent photocatalytic performance of BiVO_(4)/SiC was attributed to the formation of a Z-scheme heterojunction,which could promote the separation of electron-hole pairs while maintaining the high redox activity of the catalyst.Therefore,the Z-Scheme heterojunction formed by BiVO_(4)/SiC could effectively promote the activation of PMS and generate more active species,thus accelerating the degradation process of CIP.The active species in the system were identified as h+、1O_(2)、•O_(2)-、•OH、SO_(4)•−−−through the free radical quenching experiment.The efficient degradation of CIP was realized through the interaction of free radicals and non-free radicals.Notably,the catalyst exhibited excellent stability,retaining 89.49%of its initial degradation efficiency after five consecutive cycles.This study not only presents a novel strategy for PMS activation using photocatalysts but also demonstrates its successful application in antibiotic degradation,offering a promising approach for the remediation of organic pollutants in aquatic environments.
作者
吴凯锋
徐云礼
王勋睿
王博
李学艳
WU Kai-feng;XU Yun-li;WANGXun-rui;WANG Bo;LI Xue-yan(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China;Jiangsu Provincial Fine-Quality United Testing Technology Service Co.,Ltd.,Suzhou 215100,China)
出处
《中国环境科学》
北大核心
2025年第8期4573-4585,共13页
China Environmental Science
基金
国家环境保护饮用水水源地保护重点实验室2022年度开放基金资助项目(2022YYSYKFYB1)。
