摘要
以离子液体1-庚基-3-甲基咪唑溴盐([C7mim]Br)为反应介质,采用水热法制备钆铈修饰纳米ZnO光催化剂。通过SEM、TEM、XRD、UV-Vis等手段对所制备的样品的形貌、物相和结构进行表征。结果表明,以离子液体[C7mim]Br为反应介质制备的ZnO与(Gd3+,Ce4+)-ZnO均属纤锌矿结构;钆铈修饰则有效抑制了ZnO晶粒的生长,使得光响应范围发生红移,且增强了ZnO的可见与紫外光区光吸收。以氙灯为光源,有机染料活性艳蓝为目标降解物,考察纳米ZnO及(Gd3+,Ce4+)-ZnO的光催化活性。光催化活性测试显示(Gd3+,Ce4+)-ZnO对活性艳蓝的去除率(92.36%)远高于ZnO(52.49%),Gd3+、Ce4+共修饰能够显著提高ZnO的可见光活性。
Cerium/gadolinium-doped ZnO nanocrystalline powders were synthesized by hydrothermal method with ionic liquids（ 1-hepty1-3-methy1 bromide） as template. The crystal structure,grain size and optical properties were characterized by scanning electron microscopy,UV-Vis spectroscopy and X-ray diffractometry. The photocatalytic degradation of KN-R under simulated sunlight was chosen as a model reaction to evaluate the photocatalytic performance of undoped and doped ZnO nanocrystalline powders. It was shown that the cerium and gadolinium have been successfully doped into the nanocrystalline ZnO and the doped one demonstrated much improved performance in the model reaction.
出处
《稀土》
EI
CAS
CSCD
北大核心
2014年第3期59-63,共5页
Chinese Rare Earths
基金
辽宁省科学事业公益研究基金项目资助(2011001002)
辽宁省高校人才支持计划项目资助(JLQ2011050)
关键词
钆铈修饰
纳米氧化锌
离子液体
光催化氧化
modification with gadolinium and cerium
nano ZnO
ionic liquid
photocatalytic oxidation
