球磨法制备Tm^(3+)和Tm_2O_3掺杂TiO_2及光催化活性研究  

Study on photocatalytic activity of Tm^(3+) and Tm_2O_3 doped TiO_2 prepared via ball milling method

作　　者：李晨[1] 季日鑫 吴迪[1] 王丽丽 张大帅[1] 祁晓炜[1] 张小朋[1] 史载锋[1] 林强[1] LI Chen;JI Ri-xing;WU Di;WANG Li-li;ZHANG Da-shuai;QI Xiao-wei;ZHANG Xiaopeng;SHI Zaifeng;LIN Qiang(Key Laboratory of Water Pollution Treatment&Resource Reuse,Hainan Normal University,Haikou 571158,China)

机构地区：[1]海南省水环境污染治理与资源化重点实验室海南师范大学化学与化工学院,海南海口571158

出　　处：《化学研究与应用》2019年第1期57-64,共8页Chemical Research and Application

基　　金：海南省重点研发项目(ZDYF2017011);海南省自然科学基金(20156242;217101;20152033);国家级大学生创新创业训练计划(201611658028)

摘　　要：为了提高TiO_2的光催化活性,优化球磨工艺,采用球磨法制备稀土金属Tm掺杂TiO_2光催化剂,在300W中压汞灯光照下,对模拟染料亚甲基蓝(MB)溶液进行降解,考察稀土金属Tm以离子态或氧化物掺杂TiO_2的光催化活性,探究球磨中掺杂比、球料比对TiO_2光催化活性的影响,并用XRD、UV-vis DRS、SEM-EDS等对催化剂进行表征。结果表明,Tm~^(3+)的存在可以诱导TiO_2产生晶格畸变,Tm^2O_3/TiO_2和Tm~^(3+)/TiO_2对可见光产生响应,禁带宽度分别降低至2. 97 eV和3. 05 eV。当催化剂投入量为0. 2 g·L^(-1),亚甲基蓝(MB)溶液浓度为25 mg·L^(-1),Tm~^(3+)/TiO_2和Tm^2O_3/TiO_2的最佳掺杂比分别为2. 5%和3%、球料比为4:1、球磨转速为500rpm时,Tm~^(3+)/TiO_2、Tm^2O_3/TiO_2和纯TiO_2的一级反应速率常数分别可达0. 0689 min^(-1)、0. 0562 min^(-1)和0. 0263min^(-1)。In order to improve the photocatalytic activity of TiO2 and optimize the ball milling process,Tm^3+/TiO2 and Tm 2O 3/TiO2 photocatalysts were prepared by ball milling method.The photocatalytic activities of Tm^3+/TiO2 and Tm 2O 3/TiO2 were evaluated by the degradation of methylene blue in aqueous equipped with a 300 W medium pressure mercury lamp.The effects of doping ratio and ball-to-powder weight ratio on the photocatalytic activity of TiO2 were investigated.XRD,UV-vis DRS and SEM-EDS were used to characterize the as-prepared TiO2 photocatalysts.Results show that the existence of Tm^3+ can induce lattice distortion of TiO2.The band gap energies of Tm 2O 3/TiO2 and Tm^3+/TiO2 decrease to 2.97 eV and 3.05 eV,respectively and it leads to visible light absorption response.The first order reaction rate constants of Tm^3+/TiO2,Tm 2O 3/TiO2 and pure TiO2 are 0.0713 min^-1 ,0.0588 min^-1 and 0.0263 min^-1 ,respectively with catalysts loading of 0.2 g·L^-1 ,initial concentration of 25 mg·L^-1 for MB,mole ratios of Tm^3+/TiO2 and Tm 2O 3/TiO2 for 2.5%and 3%,ball-to-powder weight ratio of 4:1 and ball milling rate of 500 rpm.

关 键 词：球磨法 TM 二氧化钛 光催化活性 

分 类 号：O643.36[理学—物理化学]