H_4SiW_(12)O_(40)改性TiO_2的制备及光催化性能研究  

Study on the preparation and photocatalytic activity of TiO_2 modified with H_4SiW_(12)O_(40)

作　　者：黄雅丽[1] 

机构地区：[1]闽江学院化学与化学工程系,福建福州350108

出　　处：《化学工程与装备》2014年第12期27-31,共5页Chemical Engineering & Equipment

摘　　要：通过超声分散法制备了H4SiW12O40掺杂TiO2光催化剂,采用XRD、红外光谱进行表征。考察了H4SiW12O40的掺杂比例、催化剂的煅烧温度、催化剂的投加量、反应物的初始浓度对光催化降解碱性品红溶液的影响,并利用TOC测定和紫外-可见吸收光谱进一步研究了光催化降解过程。研究结果表明:H4SiW12O40掺杂后,TiO2的粒径减小,比表面积增大,光谱响应范围发生红移;硅钨酸掺杂TiO2的最佳比例为3.20%wt.;催化剂的最佳煅烧温度为400℃;催化剂的最佳用量为0.4g/L;当碱性品红溶液的初始浓度为14mg/L时,光催化效果较好;此外,光催化降解碱性品红溶液的过程可能是分步进行的。Ultrasonic dispersion method was adopted to prepare the pholocatalysts of TiO2 modified with H4SiW12O40 .The catalysts were characterized by XRD and FTIR spectroscopy. The factors having effect on the photocatalytic degradation of basic fuchsin, such as the doping ratio of H4SiW12O40, the sintering temperature of the catalyst photocatalyt s, the dosage of catalysts and the initial concentration of reactant were investigated. The ic degradation process of basic fuchsin solution was studied by TOCdetermination and the UV-visible absorption spectrum. The characterization results suggested that the crystalline grain of TiO2 had smaller size, larger specific surface area and the spectral response range to long wave after doping with H4SiW12O40. The results also indicated that the best H4SiW12O40 doping ratio was 3.20%wt., the best sintering temperature of catalysts was 400℃, the optimum use of catalyst was 0.4g· L^-1and when the initial concentration of basic fuchsin solution was 14mg · L^-1, the degradation effect was better. In addition, the photocatalytic degradation reaction might occur step by step.

关 键 词：硅钨酸 TIO2 掺杂 碱性品红 光催化 

分 类 号：O643.36[理学—物理化学]