钕掺杂对纳米TiO_2光催化分解水制氢活性的影响  

Effect of Nd^(3+) Doping on Photocatalytic Activity of TiO_2 Nanoparticles for Water Decomposition to Hydrogen

作　　者：黄翠英[1] 由万胜[1] 党利琴[1] 雷志斌[1] 孙振刚[1] 张澜萃[1] 

机构地区：[1]辽宁师范大学化学化工学院功能材料化学研究所,辽宁大连116029

出　　处：《催化学报》2006年第3期203-209,共7页

基　　金：国家自然科学基金(20273070);国家重点基础研究发展计划(2003CB214500);辽宁省博士启动基金(20031059);大连市优秀人才基金资助项目

摘　　要：采用溶胶-凝胶法制备了一系列纳米TiO2和掺杂Nd3+的纳米TiO2光催化剂,并通过XRD,UV-Vis,TEM和N2吸附等技术对其进行了表征和分析,考察了样品光催化分解水制氢的活性.结果表明,Nd3+的掺杂使TiO2的相变温度从600℃提高到800℃,同时有效抑制了TiO2的粒径增长,提高了粒子的分散性和样品的比表面积,Nd3+掺杂量越大,催化剂的比表面积越大.掺杂Nd3+后,TiO2的光催化制氢活性提高,本实验中Nd3+的最佳掺杂量为0.1%,此时催化剂的活性比未掺杂TiO2提高了3.5倍.随着焙烧温度升高,TiO2和Nd3+/TiO2样品的光催化活性均下降,但同时一定量的金红石相与锐钛矿相共存所产生的协同效应也使样品的光催化活性有所提高.The undoped TiO2 and Nd^3 ＋ -doped TiO2 samples were prepared by sol-gel method and characterized by XRD, UV-Vis, TEM and N2 adsorption. The correlation between the photocatalytic activity for hydrogen evolution and the phase composition, BET surface area and intensity of light-absorption in UV region was investigated. For the undoped TiO2 samples, the particle size and agglomeration increased while its BET surface area and the intensity of light-absorption in UV region decreased with the increasing calcination temperature; the anatase to rutile phase transformation started at 600 ℃ and completed at 800 ℃ ; the photocatalytic activity of undoped TiO2 decreased with the increasing calcination temperature, and the sample calcined at 600 ℃ was the best because of the coexistence of a certain proportion of rutile/anatase mixed phase. For the Nd^3 ＋/WiO2 sampies, Nd^3＋ doping inhibited the crystal phase transformation and the rutile phase began to appear at 800 ℃ ; moreover, Nd^3 ＋ doping restrained the growth of grain size, improved the dispersivity of the particles, and raised BET surface area. The more the doping amount was, the larger the BET surface area was. As the calcination temperature increases, the decreasing extent of the light-absorption intensity of Nd^3 ＋/TiO2 in UV region was lower than that of undoped TiO2. Nd^3 ＋ raised the photocatalytic activity for hydrogen generation and the optimum amount of Nd^3 ＋ doping was 0.1%, at which the photocatalytic activity of Nd^3 ＋/TiO2 was 3.5 times higher than that of undoped TiO2.

关 键 词：钕 氧化钛 光催化 水分解 氢气 

分 类 号：O643.32[理学—物理化学]