MWNTs/Bi_(2)WO_(6)-TiO_(2)光催化降解土霉素的性能及机理  

Performance and Mechanism of MWNTs/Bi_(2)WO_(6)-TiO_(2) for Photocatalytic Degradation of Oxytetracycline

作　　者：张伟 俞龙 舒金锴 ZHANG Wei;YU Long;SHU Jinkai(School of Municipal and Geomatics Engineering,Hunan City University,Yiyang 413000,China;Hunan Province Engineering&Technology Research Center for Rural Water Quality Safety,Yiyang 413000,China;CAUPD Beijing Planning and Design Co.,Ltd.,Shantou Yuedong Branch,Shantou 515000,China)

机构地区：[1]湖南城市学院市政与测绘工程学院,湖南益阳413000 [2]湖南省村镇饮用水水质安全保障工程技术研究中心,湖南益阳413000 [3]中规院<北京>规划设计有限公司汕头粤东分公司,广东汕头515000

出　　处：《净水技术》2023年第3期81-87,142,共8页Water Purification Technology

基　　金：国家自然科学基金面上项目(42071122)。

摘　　要：土霉素(OTC)是抗生素类废水去除的主要目标污染物之一。通过水热法合成了一种可见光响应良好的新型复合光催化剂———MWNTs/Bi_(2)WO_(6)-TiO_(2),采用OTC模拟废水进行光催化降解性能及机理研究。结果表明,在反应温度为25℃时,投加0.8 g/L的MWNTs/Bi_(2)WO_(6)-TiO_(2),光催化初始pH值为6、200 mL质量浓度为50 mg/L的OTC溶液120 min,降解率可达到83.97%,复合催化剂的可见光照射催化效果明显优于紫外光。复合光催化材料显示了良好的稳定性,经过4次循环使用,对OTC的降解率达72.13%,仍保持较高的光催化活性。·OH、·O-2是光催化降解中主要的活性物质。以上研究结果可为含抗生素的废水处理研究提供参考。Oxytetracycline(OTC)is one of the main targets pollutant of antibiotic wastewater removal.A novel composite photocatalyst(MWNTs/Bi_(2)WO_(6)-TiO_(2))with good visible light response was synthesized by hydrothermal method.The photocatalytic degradation performance and mechanism of MWNTs/Bi_(2)WO_(6)-TiO_(2) by simulated OTC wastewater were studied.Results showed that,when the reaction temperature was 25℃,MWNTs/Bi_(2)WO_(6)-TiO_(2) dosage was 0.8 g/L,initial pH value was 6,mass concentration of OTC solution was 50 mg/L,and its volume was 200 mL,the degradation rate of OTC could reach 83.97%in 120 min.The catalytic effect of composite catalyst under visible light irradiation was obviously better than that under ultraviolet light.The composite photocatalytic material showed good performance stability that the degradation rate of OTC reaches 72.13%and still maintains high photocatalytic activity after 4 cycles of use.·OH and·O-2 were the main reactive species in photocatalytic degradation.The abovementioned conclusion can provide a guidance for antibiotic removal in wastewater.

关 键 词：水热法 MWNTs/Bi_(2)WO_(6)-TiO_(2) 光催化 土霉素(OTC) 降解率 

分 类 号：X703[环境科学与工程—环境工程]