ZnO掺杂纳米CeO_2的共沸蒸馏法合成  

Synthesis of ZnO-Doped CeO_2 Nanoparticles by Azeotropic Distillation Processing

作　　者：宋晓岚[1] 曲鹏[1] 何希[1] 杨海平[1] 邱冠周[1] 

机构地区：[1]中南大学,湖南长沙410083

出　　处：《稀有金属材料与工程》2006年第A02期303-308,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(59925412);湖南省自然科学基金项目(03JJY3015)资助

摘　　要：采用化学共沉淀法结合正丁醇共沸蒸馏处理前驱体合成了ZnO掺杂纳米CeO2颗粒,通过XRD,DSC/TG,IR, TEM,原子吸收光谱以及紫外透过率分析等方法对其结构和性能进行了表征:并根据XRD线宽法,由Scherrer公式计算其晶粒尺寸,研究了共沸蒸馏、ZnO掺杂、以及焙烧温度和时间对CeO2纳米晶粒尺寸的影响。结果表明:正丁醇共沸蒸馏法能有效脱除前驱体凝胶中的水分,防止干燥和焙烧过程中硬团聚的形成,从而得到粒径更小、分布更均匀、分散性更好的纳米CeO2颗粒:2 mol％～10 mol％掺杂ZnO能与纳米CeO2形成固溶体,且掺入量增加引起纳米CeO2晶粒有所增大;随焙烧温度提高,ZnO掺杂纳米CeO2晶粒显著长大,而高温下随焙烧时间延长,其晶格进一步趋于完整,晶粒尺寸增加;纳米CeO2具有良好的可见光透过和紫外光吸收能力,ZnO掺杂不会影响纳米CeO2的紫外遮蔽效果。Zinc oxide-doped CeO2 nanoparticles were synthesized by coprecipitation method combining with precursor treatment of butanol azeotropic distillation. XRD, DSC/TG IR, TEM, atomic absorption spectroscopy and UV-Vis spectroscopy were used to characterize the nanoparticles stuctures and properties. Scherrer formula was used to caculate the grain size. The effects of azeotropic distillation, ZnO dopping amount, calcined temperature and time on the grain size were investigated. It is found that solid solution can be formed as the doping amount changing from 2 mol%-10 mol%. The azeotropic distillation dramatically reduced the possibility of formation of the chemical bonds and prevented the formation of hard agglomerates. The amount doping ZnO has effects on the grain size. As the calcined temperature and time increase, the grain size of nanoparticles was incresing. The CeO2 nanoparticles have high transparency in a visible light region and high UV-shielding property. Doping with ZnO did not result in the loss of UV-shielding ability of ceria.

关 键 词：纳米CEO2 ZnO掺杂 共沸蒸馏法 晶粒尺寸 

分 类 号：O614.332[理学—无机化学]