Ru负载TiO2纳米管阵列的制备及其光电催化性能  

Preparation and Photoelectrocatalytic Performance of Ru Loaded TiO2 Nanotubes

作　　者：王竹梅 沈宗洋 李月明 左建林 Wang Zhumei;Shen Zongyang;Li Yueming;Zuo Jianlin(China National Light Industry Key Laboratory of Functional Ceramic Materials,School of Materials Science and Engineering,Jingdezhen Ceramic Institute,Jingdezhen 333403,Jiangxi,China)

机构地区：[1]景德镇陶瓷大学材料科学与工程学院中国轻工业功能陶瓷材料重点实验室,江西景德镇333403

出　　处：《稀有金属》2020年第6期609-615,共7页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51462010);景德镇市科技计划项目(2017GYZD019-012)资助。

摘　　要：结合阳极氧化法和脉冲沉积法合成了管径约40~70 nm、管壁厚约10 nm、管长约1μm、管壁上附着Ru纳米颗粒的TiO2纳米管光催化剂(Ru/TiO2),实现了金属Ru纳米颗粒在TiO2纳米管表面的均匀负载。研究了RuCl3浓度和煅烧温度对TiO2纳米管的微观结构、光吸收特性及光催化活性的影响。结果表明:Ru的负载使Ru/TiO2纳米管的光学带隙值有所减小,光响应阈值发生红移;锐钛矿相TiO2与少量金红石相TiO2可形成异质结,纳米Ru可俘获光生电子,两者都可促进光生电子-空穴对的分离,从而提升降解效率;另外,外加偏压也可促进光生电子-空穴对的分离,从而进一步提升降解效率。当脉冲沉积液中RuCl3浓度为0.05 mol·L^-1,经600℃煅烧后的Ru/TiO2纳米管阵列的光催化活性最好,对甲基橙降解1 h,紫外光下的光催化和光电催化分解比例由纯TiO2纳米管的38.6%和48.5%提升至52.0%和70.5%,可见光下的光催化和光电催化分解比例由纯TiO2纳米管的7.1%和17.2%提升至36.3%和75.2%。TiO2 nanotubes loaded with Ru nanoparticles composite photocatalysts(Ru/TiO2)were synthesized by combining anodic oxidation and pulsed electrodeposition method,whose diameter,wall thickness and length were 40~70 nm,10 nm and 1μm,respectively,realizing homogeneous deposition of Ru nanoparticles on the surface of TiO2 nanotubes.The effects of the RuCl3 concentration and calcination temperature on the microstructure,optical absorption behavior and photocatalytic activities of the nanotubes were also investigated.The results showed that Ru loading could decrease the band gap energy and make the absorption edges of the samples red shifting.Anatase titania and a small amount of rutile titania formed heterojunction,and photogenerated electrons were trapped by Ru nanoparticles,which promoted the separation of photogenerated electron-hole pairs.In addition,the external bias voltage could promote the separation of photogenerated electron-hole pairs and improve the degradation efficiency further.By Ru loading,the ratios of photocatalytic and photoelectrocatalytic degradation of methyl orange for 1 h increased from 38.6%and 48.5%to 52.0%and 70.5%under ultraviolet light,and increased from 7.1%and 17.2%to 36.3%and 75.2%under visible light with the RuCl3 concentration of 0.05 mol·L^-1 and calcination at 600℃.

关 键 词：光催化 二氧化钛 Ru负载 异质结 可见光 甲基橙 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]