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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。
The Cd doped nanowire ZnO photocatalysts were synthesized by hydrothermal method using zinc chloride, cadmium chloride and sodium hydroxide as raw materials. The photocatalytic activity of the nanostructured ZnO photocatalyst was studied by the degradation of Rhodamine B aqueous solution. The physical properties of the materials were characterized by XRD, SEM, EDS, PL and UV-Vis. Characterization. The experimental results show that when Cd2 + is doped, the morphology of the sample changes and the particle size decreases. The absorption edge and UV peak of ZnO doped with Cd2 + are red shifted compared with pure ZnO, and the band gap decreases from 3.24 eV To 3.16 eV. Through the photocatalytic experimental analysis shows that the degradation of nano-ZnO photocatalysts doped Rhodamine B aqueous solution increased, the degradation rate of up to 98% after 3 h illumination, indicating that compared with pure ZnO, Cd doped ZnO nano-flowers have Higher photocatalytic activity.