微波水热法制备Cr^(3+)掺杂ZnO纳米晶及其光催化性能  

Microwave Hydrothermal Synthesis of Cr^(3+)-doped ZnO Nanoparticles and Their Photocatalytic Properties

作　　者：李丹[1] 黄剑锋[1] 曹丽云[1] 李嘉胤[1] 欧阳海波[1] 

机构地区：[1]陕西科技大学,教育部轻化工助剂化学与技术重点实验室,西安710021

出　　处：《硅酸盐学报》2013年第12期1692-1696,共5页Journal of The Chinese Ceramic Society

基　　金：陕西省自然科学基金(2010JM6001);陕西省教育厅专项项目(2010JK444);陕西省国际科技合作重点项目(2011KW-11);陕西科技大学研究生创新基金资助项目

摘　　要：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%。Znl^3/2）xCrxO nanoparticles with different Cr^3＋ 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）3·9H20 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）xCrxO nanoparticles shifted slightly toward the higher angle with the increase of Cr^3＋doping content from 0% to 10%. The sheet-like Zn1-（3/2）xCrxO nanoparticles were found to transform from regular to irregular morphologies. The analysis by UV-Vis tests indicates that the Zn1-（3/2）xCrxO nanoparticles could have a high absorption in UV region and the optical band gap Eg decreases slightly. Aceroding 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%.

关 键 词：氧化锌 掺铬 微波水热法 光催化性能 

分 类 号：TQ135.32[化学工程—无机化工]