中国光学, 2014, 7 (1): 124, 网络出版: 2014-02-26
镉掺杂氧化锌纳米花的制备及其光催化活性
Synthesis and characterization of Cd-doped ZnO nanoflowers and its photocatalytic activity
摘要
以氯化锌、氯化镉、氢氧化钠为原料,采用水热法合成Cd掺杂纳米花状ZnO光催化剂,并通过该样品对罗丹明B水溶液的降解来研究其光催化活性。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线能量色散谱(EDS)、光致发光谱(PL)及紫外-可见分光光度计(UV-Vis)等测试手段对材料物性进行表征。实验结果表明:当掺杂Cd2+时,样品形貌发生变化、粒径减小; 掺杂Cd2+后的ZnO的吸收边和紫外峰对比于纯ZnO均发生红移,禁带宽度由324 eV 减小到316 eV。通过光催化实验分析可知,掺杂后纳米ZnO光催化剂对罗丹明B 水溶液的降解率有所提高,光照3 h其降解率高达98%,说明与纯ZnO相比,Cd掺杂ZnO纳米花具有更高的光催化活性。
Abstract
The flower-like Cd-doped ZnO nanostructures were synthesized by hydrothermal method using zinc chloride(ZnCl2), cadmium chloride(CdCl2), sodium hydroxide(NaOH) as reactants. Then, the photocatalytic activities of as-grown samples were investigated by photo-degradation of rhodamine B(RhB). The samples were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), energy-dispersive X-ray analysis(EDS), photoluminescence(PL) spectroscopy, UV-visible spectroscopy. Experimental results show that with the Cd doping, the morphologies of ZnO changed greatly, and the size of ZnO became smaller. In addition, compared with the undoped ZnO, the absorption edge and the UV emission peak of the Cd-doped ZnO nanoflowers made a red shift clearly. The band gap decreased from 324 eV to 316 eV. Finally, in the photocatalytic experiment, the photocatalytic activity of Cd-doped ZnO was enhanced, and the degradation of rhodamine B(RhB) was up to 98% after the irradiation for 3 h. So the photocatalytic activities of Cd-doped ZnO nanoflowers were higher than that of the undoped ZnO.
翟英娇, 李金华, 陈新影, 宋星慧, 任航, 方铉, 方芳, 楚学影, 魏志鹏, 王晓华. 镉掺杂氧化锌纳米花的制备及其光催化活性[J]. 中国光学, 2014, 7(1): 124. ZHAI Ying-jiao, LI Jin-hua, CHEN Xin-ying, SONG Xing-hui, REN Hang, FANG Xuan, FANG Fang, CHU Xue-ying, WEI Zhi-peng, WANG Xiao-hua. Synthesis and characterization of Cd-doped ZnO nanoflowers and its photocatalytic activity[J]. Chinese Optics, 2014, 7(1): 124.