采用琼脂包覆法制备TiO2纳米薄膜及其光催化性能研究  

Preparation of Nano-TiO Thin Film by Agar Coating Method and Its Photocatalytic Degradation Performances

作　　者：董虹星[1] 刘秋平[2] 刘永锋[3] Dong Hongxing;Liu Qiuping;Liu Yongfeng(College of Electromechanical Engineering,Hangzhou Polytechnic,Hangzhou 311402,Zhejiang,China;College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,Zhejiang,China;School of Materials Science and Engineering,Zhejiang University,Hangzhou 310013,Zhejiang,China)

机构地区：[1]杭州科技职业技术学院机电工程学院,浙江杭州311402 [2]浙江工业大学化学工程学院,浙江杭州310014 [3]浙江大学材料科学与工程学院,浙江杭州310013

出　　处：《钢铁钒钛》2020年第4期18-23,共6页Iron Steel Vanadium Titanium

基　　金：浙江省自然科学基金(LQ16E020002);浙江省高等学校访问学者课题(FX2018141);浙江省教育厅课题(Y201840142);杭州市131人才项目基金。

摘　　要：采用琼脂包覆法制备TiO2纳米薄膜,并研究所制备的TiO2纳米薄膜的光催化性能。用XRD、BET、FESEM、FTIR、EDX和紫外—可见漫反射光谱等方法对薄膜进行了表征。结果表明,采用琼脂包覆法可以减小TiO2的粒径到20 nm,而采用一般溶胶凝胶法制备的TiO2晶粒尺寸为30 nm左右。琼脂包覆法制备的TiO2薄膜粒子均匀分布,无裂纹。紫外—可见漫反射光谱的结果分析表明,采用琼脂包覆法制备的TiO2纳米薄膜具有更小的带隙,120 min内对亚甲基蓝的去除率达到71%。且在5次循环处理之后,琼脂包覆法制备的TiO2纳米薄膜仍然保持很高的活性。依据反应特性对添加了琼脂的TiO2形成薄膜的机理进行了探讨。Nano-TiO2 thin films were prepared by agar coating method,and the photocatalytic properties of the prepared TiO2 thin films were studied.The thin films were characterized by XRD,BET,FESEM,FTIR,EDX and UV-Vis DRS.The results show that the crystal size of TiO2 prepared by agar coating can be reduced to 20 nm,while the crystal size of TiO2 prepared by common sol-gel method is about 30 nm.The surface images show that the nano-TiO2 thin films prepared by agar coating are uniformly distributed and have uniform morphology without crack.The results of UV-Vis DRS show that the bandgap of TiO2 is reduced by adding agar,and the removal efficiency of methylene blue by the prepared TiO2 is 71% in 120 min.The activity of TiO2 remains at high level after 5 cycles of methylene blue treatment.The formation mechanisms of coating of nano-TiO2 are also discussed based on the reaction characteristics.

关 键 词：TIO2 纳米薄膜 琼脂包覆法 光催化性能 亚甲基蓝 降解率 

分 类 号：TF823[冶金工程—有色金属冶金]