BaSO_4/TiO_2复合颗粒制备及其光催化性质  

Preparation and Photocatalysis Performance of BaSO_4/TiO_2 Composite Particles

作　　者：陈桂光[1] 骆广生[1] 杨雪瑞[1] 孙怡文[1] 汪家鼎[1] 

机构地区：[1]清华大学化学工程联合国家重点实验室,北京100084

出　　处：《过程工程学报》2005年第1期66-69,共4页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:20476050;20490200);高等学校博士学科点科研专项基金资助项目(编号: 20040003032)

摘　　要：通过三级膜分散沉淀法制备了BaSO4/TiO2复合颗粒,利用透射电镜和电子衍射对所得颗粒的结构进行了分析,并利用自行设计的紫外光催化氧化反应器对其光降解性质进行了研究.结果表明,分步沉淀法可以有效地制备表面沉积TiO2的BaSO4/TiO2复合颗粒.Ti(SO4)2浓度及沉淀剂对复合颗粒表面的TiO2颗粒粒度、晶型和光降解性能有很大的影响.提高Ti(SO4)2浓度和以NH4HCO3为沉淀剂有利于制备出光降解性能好的BaSO4表面包覆锐钛矿型TiO2的复合颗粒.复合颗粒光降解甲基橙的动力学满足0级反应动力学.Composite BaSO4/TiO2 particles were prepared by a 3-step membrane dispersion precipitation method. The structure of the composite material was analyzed by TEM and electron diffraction, and the photocatalysis performance was investigated in a self-designed reactor. The results show that BaSO4 can be coated by TiO2 nano-particles effectively with the multi-step precipitation method. The particle size and crystal type of TiO2 on the surface and photocatalysis performance of the composite particles were affected by the concentration of Ti(SO4)2. An increase in concentration of Ti(SO4)2 and with NH4HCO3 as precipitator was of benefit to the preparation of anatase-TiO2/BaSO4 particles and to the improvement of their photocatalysis performance. The photocatalytic degradation kinetics for methylic orange is of zero order.

关 键 词：二氧化钛 硫酸钡 复合材料 光降解 

分 类 号：O614.41[理学—无机化学] O643[理学—化学]