SiO_2/TiO_2复合粉体制备条件对其光催化能力的影响研究  

Study on effects of preparation conditions of SiO_2/nano-TiO_2 composite powder on the photocatalytic activity

作　　者：孙秀果[1] 吴国柱[2] 王少辉[1] 

机构地区：[1]石家庄铁道大学材料科学与工程学院,石家庄050043 [2]沧州职业技术学院化学工程系,沧州061001

出　　处：《化工新型材料》2011年第2期111-113,共3页New Chemical Materials

基　　金：河北省自然科学基金资助项目(E2008000440;E2009000911)

摘　　要：采用包覆沉淀法制备了纳米SiO2/TiO2复合粉体,考察了包覆速度、温度对所得产品性能的影响,通过TEM表征和紫外吸收光谱分析,得出合适的包覆速度是改性的关键,并初步探讨了其影响机理。以紫外光照下降解甲基橙为目标,研究了改性温度和焙烧温度对纳米SiO2/TiO2复合粉体的光催化能力的影响规律。结果表明,合适包覆速度改性后的粉体粒度分布均匀,紫外吸收能力增强,分散性提高;低温改性后的粉体,低温煅烧后光活性较好,高温改性后的粉体,高温煅烧后光活性较好。Titania nano-particles coated with silica were prepared by the coating precipitation method. The effects of coating speed and temperature on the properties of the products were studied by ultraviolet spectroscopy （UV） and transmission electron microscope （TEM）. It was found that the appropriate coating speed was key factor. The corresponding mechanism was also proposed. The effects of coating temperature and calcination temperature on the photocatalytie activity of SiO2/nano-TiO2 composite powder were investigated by the photodegradation of methyl orange in solution irradiated by ultraviolet light. It was inferred that TiO2 coated with SiO2 had smaller particle size, uniform size distribution, and the UV absorbing capability and the stability of dispersion were improved, the results showed that the effect of calcination temperature on the pbotocatalytic activity depended on covering temperature. That is to say, the lower the coating temperature , the lower the calcination temperature was needed.

关 键 词：纳米二氧化钛 二氧化硅 表面包覆 光催化 

分 类 号：TB383.3[一般工业技术—材料科学与工程]