三维有序氧化锌微粒的制备及其光催化性能  

Preparation and Photocatalytic Properties of Three-dimensionally Ordered Zinc Oxide Microparticles

作　　者：谭徜彬 李宜航 阳龑 钟俊波 宁佳强[3] 任章桦 TAN Changbin; LI Yihang; YANG Yan; ZHONG Junbo;NING Jiaqiang; REN Zhanghua;(Analytical and Testing Center, Sichuan University of Science and Engineering, Zigong 643000, China; College of Engineering and Applied Science, Nanjing University, Nanjing 210093, China; College of Materials Science and Engineering, Sichuan University of Science and Engineering, Zigong 643000, China; Key Laboratory of Green Catalysis of Higher Education Institutes of Sichuan, Zigong 643000, China)

机构地区：[1]四川理工学院分析测试中心,四川自贡643000 [2]南京大学现代工程与应用科学学院,江苏南京210093 [3]四川理工学院材料科学与工程学院,四川自贡643000 [4]绿色催化四川省高校重点实验室,四川自贡643000

出　　处：《环境科学与技术》2018年第10期21-25,共5页Environmental Science & Technology

基　　金：四川省教育厅一般项目(16ZB0249);四川理工学院人才引进项目(2015RC33);大学生创新创业训练计划项目(cx2017003);绿色催化四川省高校重点实验室开放基金项目(LYJ1803)

摘　　要：以醋酸锌和氢氧化钠为原料,柠檬酸为结构导向剂,采用一步溶剂热合成法制得一系列具有不同形貌的三维有序氧化锌(ZnO)微粒(圆盘状、多面球状、花状和绒球状等)。采用X射线衍射仪、扫描电子显微镜和比表面积分析仪对样品的结构和形貌进行表征,以甲基橙(MO)作为目标降解物,通过紫外-可见吸收光谱检测其光催化活性,探讨了pH值和锌/酸比对ZnO微粒的成形及光催化性能的影响。结果表明:p H值和锌/酸比对ZnO微粒的结构、形貌和光催化性能具有显著影响。当pH=13,锌/酸比为2∶1时,制得的绒球状ZnO微粒是由15 nm厚的纳米片组装而成的三维有序微纳米结构,在紫外光照射下,200 min内对10 mg/L甲基橙溶液的降解率可达96.42%,光催化性能最佳。A series of three-dimensionally （3D） ordered ZnO microparticles with different morphologies （such as diskshaped, multi-faceted ball-like, flower-like and fluffy sphere-like） were synthesized by a facile one-step solvothermal method, using zinc acetate and sodium hydroxide as source material, citric acid as structure-oriented agent. The structure and morphology of the samples were characterized by X-ray diffraction, scanning electron microscopy and low temperature nitrogen adsorption-desorption. The photocatalytic activity was also measured by UV-Vis absorption spectroscopy in terms of the methyl orange （MO） degradation. The effects of the pH value and the molar ratio between Zn2＋ and CA （Zn2＋/CA） on the formation of ZnO microparticles and the photocatalytic performance were discussed. The results show that the pH value and Zn2＋/CA have great influence on the structure, morphology and photocatalytic performance of ZnO microparticles. The highest photocatalytic activity is obtained with the pH value of 13 and the Zn2＋/CA of 2： 1. At this time, the as-prepared fluffy ZnO spheres are 3D ordered micro-nano structures assembled from 15nm-thick nanosheets. Under UV light irradiation, the degradation rate of 10 mg/L MO within 200 rain is 96.42%.

关 键 词：氧化锌 水热合成 光催化 甲基橙 

分 类 号：X131[环境科学与工程—环境科学]