BiVO4光催化去除废水中的四环素和环丙沙星

利用微波水热法制备单斜白钨矿型BiVO4为光催化剂,探讨其对抗生素类污染物的去除效果.同时利用X射线衍射(XRD)、傅里叶红外(FT-IR)和场发射扫描电镜(FE-SEM)等测试手段对样品结构和性能进行了表征.以四环素(TC)和环丙沙星(CIP)为目标污染物,研究光照时间、pH及Cu(Ⅱ)共存对BiVO4光催化降解抗生素性能的影响.结果表明:BiVO4对TC和CIP的光催化具有较为宽泛的pH适用范围,其中TC在pH为5~12之间具有良好的效果,pH=8时,降解效率达到74%;CIP在pH为4~9之间适用范围最好,降解率由26%升高到37%.此外,对TC和CIP光催化降解机理和可能的降解途径进行探讨,光催化降解主要机理是有效光生电子-空穴与OH-和O2结合,将TC和CIP分解为中间产物CO2和H2O.总之,单斜白钨矿型BiVO4用于模拟抗生素废水的研究,取得一定效果,可为实际抗生素废水的处理提供参考.

Photocatalytic degradation of tetracycline and ciprofloxacin contaminated water by BiVO4

BiVO4 as photocatalyst was synthesized by microwave-assisted hydrothermal method to investigate its effect on removal of antibiotic pollutants.The sample was characterized by X-ray diffraction(XRD),fourier transform infrared(FT-IR)and field emission scanning electron microscope(FE-SEM).Tetracycline(TC)and Ciprofloxacin(CIP)were selected as the target pollutants to study the effects of illumination time,initial pH of antibiotic solution and Cu(Ⅱ)coexistence on the photocatalytic degradation of antibiotics by BiVO4.The results shown that BiVO4 has a wide range of pH application for the photocatalysis of TC and CIP,in which TC has a good effect when pH is in the range of 5 and 12,and the degradation rate reaches 74%when pH=8.CIP has the best range of application for pH between 4 and 9,and the degradation rate increases from 26%to 37%.In addition,TC and CIP photocatalytic degradation mechanisms were discussed,and the possible degradation pathways of TC and CIP were also studied.The main mechanism of the photocatalytic degradation was the effective electrons and holes can combine with OH-and O2 in TC and CIP solution,which can decompose TC and CIP into intermediate product or CO2 and H2O.In conclusion,BiVO4 is used in the research of antibiotic wastewater,which has obtained certain effects and provided a reference for the treatment of antibiotic wastewater.