摘要
采用改进的Sol-gel方法,制备了一种新型的单分散椭球形微孔结构的纳米GeO2/TiO2复合光催化剂,并用TG-DTA、XRD、XPS、UV-vis、FT-IR、TEM、BET等手段进行了表征.以难生化降解的染料罗丹明B为目标降解物,采用HPLC测定不同光照时间下催化剂对染料降解的情况,考察了催化剂的光催化活性.结果表明,改进的Sol-gel法制得的复合光催化剂具有明显的孔结构,而且比表面积大、粒径小、粒径分布窄、分散性好;与适量GeO2复合后能够有效提高TiO2纳米粒子的光催化活性;复合光催化剂的最佳制备条件为GeO2摩尔含量为0.1%,煅烧温度为400℃,所制得的GeO2/TiO2光催化活性比纯TiO2有显著提高.
A sort of monodispersed, ellipsoidal and hollow GeO2 doped TiO2 nanopartieles is successfully prepared by an improved Sol-gel method, which was based on an improved Sol-gel technique using metal salts as precursors, by controlling the hydrolysis of these precursors with an acetic acid. The TiO2 nanoparticles prepared were characterized by means of TG-DTA ,XRD ,XPS ,UV-vis,FT-IR ,TEM and BET. The relationship between preparing condition and the photoeatalytie activity of the elaborated powders were studied by review the ability of degradation of Rhodamine B. The results showed that the photoeatalytie activity of GeO2 doped TiO2 prepared by Sol gel method was much higher than that of pure TiO2 particles. The most efficient degradation of Rhodamine B was found with TiO2 particles doped with 0. 1% GeO2 in mole and ealclned at 400℃. Also the reason for the enhancement of the photoeatalytic activity of TiO2 by GeO2 doping was discussed.
出处
《环境科学学报》
CAS
CSCD
北大核心
2006年第9期1491-1497,共7页
Acta Scientiae Circumstantiae
基金
河南省创新人才工程项目(教高[2001]513号)
广东省自然科学基金团队项目(No.04205301)
广州市科技计划项目(No.2005z3-D2081)~~