摘要
以Zn(NO3)3.6H2O、Ce(NO3)3.6H2O为原料,明胶为模板分散剂,采用凝胶模板燃烧法制备纯ZnO和Ce/ZnO纳米晶,利用XRD、TEM、BET、UV-Vis漫反射进行表征。以染料罗丹明B为目标降解物考察了样品的光催化活性。结果表明:产物粒子形状基本为球形,结晶良好,属六方晶系结构。相比纯ZnO,Ce/ZnO对光具有更高的吸收利用率,在紫外和可见光下对罗丹明B的降解能力均有明显提高;随Ce掺杂量的增加,样品的粒径减小,比表面积增大,罗丹明B的降解率相应增大,在紫外和可见光下降解率分别可达98.6%、78.3%,其原因在于Ce掺杂有利于在ZnO纳米粒子中心和表面之间产生电势差,实现光生电子-空穴对的有效分离。
Pure and Ce-doped ZnO nanocrystalline were synthesized by gel-template combustion process using Zn(NO3)2·6H2O and Ce(NO3)3·6H2O as raw materials,gelatin as a based template dispersant.The samples were characterized by XRD,TEM,BET,UV-vis,the photocatlytic activity was studied by degrating Rhodamine B.The results showed that the hexagonal products appeared to be regularly spherical and the crystallinities were rather well.Ce-doped ZnO had stronger absorption and higher degradation activity for rhodamine B than pure ZnO in UV and visible regions.As the Ce doping content increasing,the size of Ce/ZnO nanoparticles size decreased and specific surface area increaed,the degradation rate of rhodamine B increased accordingly,the highest degradation rate was 98.6%,78.3% under UV and visible light,respectively,and its main reason was that Ce-doping was helpful to form the electric potential difference between the center and surface of nanoparticle,thus leading to an effective separation for photoinduced electron and hole pairs.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2011年第4期917-920,931,共5页
Journal of Synthetic Crystals
基金
国家自然科学基金(20877022)
河南省基础与前沿技术研究计划项目(102300410101,112300410104)
河南省教育厅自然科学研究计划项目(2009A610008)
关键词
ZNO纳米晶
CE掺杂
凝胶模板燃烧法
光催化活性
ZnO nanocrystalline
Ce doping
gel-template combustion process
photocatalytic activity