RE/TiO2纳米粒子在自然光下的催化氧化性能
来源期刊：中南大学学报(自然科学版)2002年第4期
论文作者：周艺 徐协文 刘其城 周琼花 郏宇飞
文章页码：371 - 373
关键词：掺杂; TiO2;自然光;催化;稀土
Key words：doping; titania; solar light; photocatalysis; RE
摘 要：半导体光催化技术为环境治理提供了一条新途径,其中,TiO2因具有化学性质稳定、成本低、难溶、无毒等特点,是理想的光催化剂,但由于其吸收光谱在紫外区,日光利用率低,故其应用受到限制.为了提高太阳能的利用率和光催化活性,需研究出可提高TiO2自然光催化活性的掺杂物,为此,以钛酸丁酯和稀土盐为原料,采用溶胶-凝胶法制备了掺杂稀土的光催化剂RE/TiO2 (RE为Pr,La,Gd,Ho,Nd),通过XRD法研究了光催化剂的结构特征;以甲基橙为目标降解物,考察其在自然光下的催化氧化活性.研究结果表明:RE掺杂能够显著提高TiO2粒子的光催化降解能力,且催化活性与RE性质、掺杂方式及掺杂量有关,其中掺Gd样品的光催化活性最强;用共沉淀法制备的掺Gd样品比用负载法制备的掺Gd样品在自然光下具有更强的催化活性.
Abstract: Semiconductor photo activate technology is widely used in environment protection and control. Titania, characterized by its chemical stability, low cost, good refractory property and innocuity, is an ideal photo-catalyzer, but its application is limited by relatively low solar light utility due to its absorption spectrum in ultraviolet part. Therefore, it is necessary to improve activity of the TiO2 photo-catalysis and utility of solar light. To achieve that goal, titania photocatalysis doped with Rare-Earth(RE) compound is prepared employing sol-gel method using tetrabutyl as starting material. Structure and characteristics of the photo-catalysis are investigated with XRD, etc. Oxidating activity of the photocatalysis is analyzed utilizing methyl orange as degradation agent. Experimental results show that RE doping remarkably increases photo-catalysis degradation ability of titania particle, and that the increment is closely related with different kind of RE, and its adding amount and the doping way. Among all the RE (Pr, La, Gd, Ho, Nd) employed, specimen doped with Gd compound possesses the highest photo-catalysis activity with co-sedimentation method compared with loading method.
