硅酸盐学报

以Zn(NO3)2·6H2O为锌源、Cr(NO3)3·9H2O为铬源,采用微波水热法制备了不同Cr3+掺杂比例的Zn1–(3/2)x Crx O纳米晶。借助于X射线衍射、扫描电子显微镜和紫外–可见(UV–Vis)光谱分别对产物的物相、形貌和光学性能进行分析。结果表明:随着Cr3+掺杂量的增加,ZnO纳米晶的衍射峰向高角度方向漂移;ZnO纳米晶的显微结构呈片状,且由规则片层结构向无规则片状结构转变;UV–Vis光谱分析表明,所制备Cr3+掺杂ZnO纳米晶对紫外光有强烈的吸收,其禁带宽度减小。可见光催化测试结果表明,Cr3+掺入使氧化锌的光催化性能有所提高,当掺杂量为5%时,其光催化性能最优,对罗丹明B的降解率达到96.4%。

Zn1–(3/2)x Crx O nanoparticles with different Cr3+ doping contents(i.e., 0, 2%, 5%, 8% and 10% in mole fraction) were synthesized with Zn(NO3)2·6H2O as Zn source and Cr(NO3)3·9H2O as Cr source materials by a microwave hydrothermal method. The phase, morphology and optical properties of the as-prepared samples were characterized by X-ray diffraction(XRD), scanning electron microscopy and ultraviolet–visible(UV–Vis) spectroscopy, respectively. The results show that the XRD peaks of Zn1–(3/2)x Crx O nanoparticles shifted slightly toward the higher angle with the increase of Cr3+ doping content from 0% to 10%. The sheet-like Zn1–(3/2)x Crx O nanoparticles were found to transform from regular to irregular morphologies. The analysis by UV–Vis tests indicates that the Zn1–(3/2)x Crx O nanoparticles could have a high absorption in UV region and the optical band gap Eg decreases slightly. Accroding to the results by visible-light photocatalytic test, the Cr-doped ZnO has superior visible-light photocatalytic properties. The 5% Cr-doped ZnO has an optimal photocatalytic activity, and the degradation rate for Rhodamine B(RhB) is 96.4%.