钨改性TiO_2可见光下去除水中阿替洛尔的性能  

Photocatalytic degradation of atenolol by using W-modified TiO_2 particles under visible light

作　　者：李莲 吴磊[1] 邵云[1] 张黎明[1] LI Lian;WU Lei;SHAO Yun;ZHANG Liming(College of Energy and Environment,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学能源与环境学院,江苏南京210096

出　　处：《中南大学学报（自然科学版）》2018年第11期2656-2662,共7页Journal of Central South University:Science and Technology

基　　金："十二五"国家科技支撑计划项目(2013BAJ10B12-02);江苏省环保科研课题(2016029)~~

摘　　要：为提高自然条件下水中阿替洛尔的光催化降解速率,降低阿替洛尔对环境的影响,以钛酸正丁酯为Ti源,偏钨酸铵为W源,采用溶胶-凝胶法制备掺钨TiO_2,通过X线衍射(XRD)、紫外可见漫反射光谱(UV-vis)、比表面积分析(BET)和扫描电子显微镜(SEM)等方法考察掺钨量(物质的量比)、煅烧温度、催化剂及底物初始质量浓度对阿替洛尔降解率的影响,同时对光催化氧化阿替洛尔的反应机理进行研究。研究结果表明:在500℃下煅烧4 h,掺钨量为10%为催化剂最佳制备条件;在功率为13 W的LED白灯模拟的可见光下,初始质量浓度为10 mg/L的阿替洛尔在1.0 g/L催化剂作用下反应4 h,其降解率可达92%;其中空穴(h^+)和羟基自由基(OH·)为主要活性基团。In order to reduce the environment risk of ATL,a photocatalyst of W-modified TiO2 was selected to improve the degradation speed of ATL in water.The photocatalysts of W-modified TiO2 were prepared by sol-gel method,with Ti(OC2H5)4 and ammonium tungsten partial as precursors.The microstructure and properties of W-modified TiO2 were characterized by using X-ray diffraction(XRD),UV-Vis spectrophotometer techniques,the Brunauer-Emmett-Teller(BET)theory,as well as scanning electron microscopy(SEM).The effects of tungsten contents(molar ratio),calcination temperature,mass concentration of catalyst and initial substrate on ATL degradation were investigated.Meanwhile,the degradation mechanism of ATL was studied according to their photocatalytic properties.The results show that TiO2 with 10%W(molar ratio)calcined at 500℃for 4 h presents the best photo-degradation performance.The degradation efficiency of 10 mg/L ATL reaches to 92%after visible light irradiation for 240 min in the presence of 1.0 g/L catalyst.In addition,holes(h+)and hydroxyl radical(OH·)are determined to be the predominant reactive groups.

关 键 词：钨改性 TIO2 可见光催化 阿替洛尔 

分 类 号：X52[环境科学与工程—环境工程]