【作者】 王晓林； 陈建华； 龚竹青；

【Author】 WANG Xiao-lin~(1,2),CHEN jian-hua~(1,3),GONG Zhu-qing~3(1. College of Pesources and Enviro nment, Guangxi University, Nanning 530004;2. College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004;3. College of Metallurgical Science and Engineering, Central South University, Changsha 410083)

【机构】 广西大学资源与环境学院； 中南大学冶金科学与工程学院；

【摘要】 采用溶胶-凝胶法制备了13种离子掺杂的纳米TiO₂光催化剂。系统的考察了它们光催化降解甲基橙的催化活性,并且对其可能的光催化活性的影响因素进行了全面的分析。发现其催化活性的变化与这些离子的掺杂浓度、离子半径、离子的电子亲和势、离子的电子构型、离子掺杂对TiO₂造成的品格畸变以及离子在TiO₂晶体中的能级位置等因素有关。其中,掺杂V⁵⁺、Ag⁺、Ni²⁺、La³⁺、Fe³⁺及W⁶⁺能够有效的提高光催化降解甲基橙的脱色率;而对于Cr³⁺以及闭壳型的Zn²⁺、Al³⁺等对TiO₂光催化活性的影响较小,甚至有所降低。更多还原

【Abstract】 A series of nanomter TiO₂ photocatalysts doped 13 metal ions were prepared by sol-gel. Their photocatalytic activities in photodegradation of methyl-orange were tested systemically, and the possible factors influenced the photccatalytic activities were analysed. It was found that the catalytic activity of TiO₂ were related with the concentration of dopants, ion radius, ion electronic affinity, ion electronic conformation, crystal lattice aberrance of ion doped TiO₂ and energy levels of impurity ions in TiO₂ crystal, and so on. Whereinto, doping with V⁵⁺ ,Ag⁺ ,Ni²⁺, La³⁺, Fe³⁺ and W⁶⁺ could significantly increase the photoreactivity of TiO₂ powders while Cr³⁺ and the dopants with a closed-shell electronic configuration(Zn²⁺ ,Al³⁺) had little influence on the observed photoreactivity, even decreased it.更多还原