镉掺杂氧化锌纳米花的制备及其光催化活性

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3.24 eV 减小到3.16 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。

Synthesis and characterization of Cd-doped ZnO nanoflowers and its photocatalytic activity

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 photocata-lytic activities of as-grown samples were investigated by photo-degradation of rhodamine B（RhB）.The sam-ples 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 3.24 eV to 3.16 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 .