Bi2MoO6/Bi2S3异质结光催化降解四环素-铜复合物  

Photocatalytic Degradation of Tetracycline and Copper Complex by BiMoO/BiS Heterojunction

作　　者：黄文鑫 魏虎 蒋彩云[2] 王玉萍[1] HUANG Wen-xin;WEI Hu;JIANG Cai-yun;WANG Yu-ping(Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control,School of Chemistry and Materials Science,Nanjing Normal University,Nanjing 210023,China;Jiangsu Engineering and Research Center of Food Safety,Jiangsu Institute of Commerce Department of Engineering and Technology,Nanjing 210007,China)

机构地区：[1]南京师范大学化学与材料科学学院,江苏省物质循环与污染控制重点实验室,南京210023 [2]江苏经贸职业技术学院工程技术学院,江苏省食品安全工程技术研发中心,南京210007

出　　处：《环境科学》2020年第12期5488-5499,共12页Environmental Science

基　　金：国家自然科学基金项目(51578295)。

摘　　要：利用溶剂热法制备了Bi2MoO6/Bi2S3异质结材料,采用XRD、TEM、UV-Vis、XPS和光电流响应等表征手段对异质结材料的形貌结构、化学组成和光电性能进行了表征.利用所合成的Bi2MoO6/Bi2S3对四环素(TC)及四环素-铜(TC-Cu)复合物进行光催化降解.考察了溶液的初始p H,TC初始浓度及TC与Cu^2+复合量比对TC降解效果的影响.通过自由基捕获实验及中间产物的鉴定探讨了Bi2MoO6/Bi2S3光催化降解TC和TC-Cu过程的主要活性自由基、中间产物及降解机制;并利用小球藻生长抑制率实验评估了光催化降解过程的毒性.结果表明所制备的Bi2MoO6/Bi2S3异质结是均匀的纳米片,带隙能为1.76e V.Bi2MoO6与Bi2S3质量比为3∶1(MS-0.3)异质结对TC浓度为10 mg·L^-1和量比为2∶1的TC与Cu^2+的中性溶液表现出最强的光催化性能,反应60 min后,TC-Cu中TC的去除率和溶液的矿化率分别为85.63%和52.94%.活性基团捕获实验的结果表明,该异质结在可见光下主要的活性物种是·O2^-.生长抑制率实验结果表明,Cu^2+的存在降低了复合物中TC光催化降解产物的毒性,光催化氧化可以有效去除复合物中的抗生素.Bi2MoO6/Bi2S3 heterojunctions were synthesized by the solvothermal method.The morphology,chemical composition,and photoelectric properties of the heterojunction materials were characterized by XRD,TEM,UV-Vis,XPS,and I-T.Tetracycline(TC)and tetracycline-copper(TC-Cu)composites were degraded by the as-prepared heterojunctions under visible light.The effects of p H,initial concentration of TC,and molar ratio of TC to Cu^2+on the degradation deficiency of TC were investigated.Additionally,the main active radicals,intermediates,and mechanisms were ascertained by in situ capture experiments and the identification of intermediates.The toxicities of TC and TC-Cu before and after degradation were evaluated by chlorella growth inhibition experiments.The results showed that the prepared Bi2MoO6/Bi2S3 heterojunction was a uniform nanosheet and its band gap was 1.76 e V.Bi2MoO6 and Bi2S3 with a mass ratio of 3∶1(MS-0.3)exhibited a composite ratio of TC and Cu^2+was 2∶1 and had the best photocatalytic performance.When the concentration of TC was 10 mg·L^-1 with neutral solutions,after reacting for 60 min,the degradation rate of TC and mineralization rate of the solution for TC-Cu were 85.63%and 52.94%,respectively.The results of active group capture experiments showed that the main active group of the heterojunction was the·O2^-radical in visible light.In addition,the results of growth inhibition experiments showed that the presence of Cu^2+reduces the toxicity of TC photocatalytic degradation products in the TC-Cu complex,and the antibiotics can be effectively removed in the TC-Cu complex by photocatalytic oxidation.

关 键 词：光催化 四环素 铜离子 复合物 降解机制 

分 类 号：X131.2[环境科学与工程—环境科学] X703.1