超声波强化均匀沉淀法制备纳米TiO_2  

Preparation of nano-TiO_2 by homogeneous precipitation intensified with ultrasound

作　　者：张茜芸[1] 仲兆平[1] 姚杰[1] 

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,南京210096

出　　处：《东南大学学报（自然科学版）》2012年第4期680-684,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家高技术研究发展计划(863计划)资助项目(2008AA05Z303);江苏省科技支撑计划资助项目(BE2010184);江苏省环保科研课题资助项目(201031)

摘　　要：为了改善纳米TiO2的分散性能和细化其颗粒尺寸,采用超声波强化均匀沉淀法制备纳米TiO2.首先以工业级硫酸氧钛为原料,用均匀沉淀法制备纳米TiO2,通过对比试验来反映超声波对于制备纳米TiO2的影响.然后采用BET比表面积与孔隙度分析、扫描电子显微镜、透射电子显微镜、X射线衍射分析研究了超声波的强化作用.试验结果表明:超声波的强化作用具有明显的细化颗粒尺寸的作用;能增加纳米TiO2的比表面积、孔容积与孔径;能改善分散度,使颗粒粒径分布范围变窄.通过均匀沉淀过程能直接获得纯锐钛型纳米TiO2,而无需经过特定温度的煅烧定型,超声波作用对产物晶型无影响.In order to improve the dispersion of nano-TiO2 and to reduce the particle size,nano-TiO2 were synthesized by homogeneous precipitation intensified with ultrasound.Industrial grade TiOSO4 was used as raw material to synthesize nano-TiO2 by homogeneous precipitation.The effect of ultrasound on the fabrication of nano-TiO2 was studied by comparison tests.The characterization of nano-TiO2 was investigated by the BET surface area and porosity analysis,scanning electron microscope,transmission electron microscope,and X-ray diffraction analysis.The results show that the role of ultrasound can reduce the particle size significantly.Also it can increase the surface area,pore volume and pore size of nano-TiO2,and improve the dispersion properties and particle size distribution.Anatase nano-TiO2 can be obtained directly by the homogeneous precipitation process without specific calcine steps.And ultrasonic treatment does not change anatase crystal of the nano-TiO2 samples.

关 键 词：SCR催化剂 超声波 均匀沉淀 纳米TIO2 

分 类 号：X701[环境科学与工程—环境工程]