片花状ZnO@碳球核壳结构的制备及太阳光催化性能
Preparation and Sunlight Photocatalytic Performance of Flower-like ZnO@carbon Sphere Core-Shell Structure
作者单位E-mail
赵晓华 河南师范大学环境学院, 黄淮水环境与污染防治教育部重点实验室, 河南省环境污染控制重点实验室, 环境功能材料与污染控制河南省工程实验室, 新乡 453007
河南师范大学化学化工学院, 新乡 453007 
 
苏帅 河南师范大学化学化工学院, 新乡 453007  
武广利 河南师范大学化学化工学院, 新乡 453007  
娄向东 河南师范大学化学化工学院, 新乡 453007  
秦喆 河南师范大学环境学院, 黄淮水环境与污染防治教育部重点实验室, 河南省环境污染控制重点实验室, 环境功能材料与污染控制河南省工程实验室, 新乡 453007  
周建国 河南师范大学环境学院, 黄淮水环境与污染防治教育部重点实验室, 河南省环境污染控制重点实验室, 环境功能材料与污染控制河南省工程实验室, 新乡 453007 zhoujgwj@163.com 
摘要: 采用水热法合成具有核壳结构的片花状ZnO@碳球系列复合物(ZnO@C)。利用X射线衍射(XRD),扫描电子显微镜(SEM),X射线光电子能谱(XPS),红外光谱(FTIR),紫外可见漫反射光谱(UV-Vis DRS),荧光光谱(PL)以及N2吸附-脱附等技术对所合成样品进行表征,结果表明,碳球被ZnO纳米片包裹形成具有核壳结构的片花状复合物,碳球的存在增加了ZnO对可见光的吸收,有效抑制了光生电子空穴对的复合。在模拟太阳光下,对活性染料GR黑及甲硝唑的光催化降解测试结果显示,ZnO@C系列复合物的光催化性能均高于纯ZnO,其中ZnO@C-2样品表现出最好的光催化性能,其光催化降解GR黑和甲硝唑的速率分别为纯ZnO的4.2倍和2.1倍。
关键词: ZnO  碳球  核壳结构  片花形貌  太阳光催化
基金项目: 国国家水体污染控制与治理科技重大专项(No.2015ZX07204-002)、河南省重点科技攻关项目(No.122102210233)、河南省基础与前沿技术研究计划项目(No.132300410286,152300410087)和河南省高等学校重点科研项目(No.16A150032)资助。
Abstract: A series of nanosheets assembled flower-like core-shell ZnO@carbon sphere (ZnO@C) composites were prepared by hydrothermal method. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscope (XPS), Fourier transform infrared spectroscopy (FTIR), UV-Vis diffuse reflectance spectroscope (UV-Vis DRS), photoluminescence (PL) and N2 adsorption-desorption determination. The results showed that carbon spheres were coated by ZnO nanosheets forming core-shell structure. The presence of carbon spheres in ZnO@C composites not only improved the absorption of ZnO in the visible light region but also inhibited the recombination of photogenerated electrons and holes. Under simulated sunlight irradiation, the photodegradation of Reactive dye GR black and metronidazole by samples were tested, the results showed that all ZnO@C composites exhibited enhanced photocatalytic performance compared to pure ZnO. Especially, the ZnO@C-2 sample showed the best photocatalytic performance, the rate constant of which was about 4.2 times that of pure ZnO for GR black degradation and 2.1 times for metronidazole degradation, respectively.
Keywords: ZnO  carbon sphere  core-shell structure  nanosheets assembled flower-like morphology  sunlight photocatalysis
投稿时间:2016-05-17 修订日期:2016-11-14
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