共沉淀法制备稀土Ce掺杂的纳米ZnO及其光催化降解染料的性能
Preparation by Co-precipitation Method and Photocatalytic Performances on the Degradation of Dyes of Ce3+-Doped Nano-ZnO
作者单位E-mail
钟伟 南京大学化学化工学院, 配位化学国家重点实验室, 南京 210023
嘉兴学院生物与化学工程学院, 嘉兴 314001 
weizhong@mail.zjxu.edu.cn 
夏颖帆 嘉兴学院生物与化学工程学院, 嘉兴 314001  
翟杭玲 嘉兴学院生物与化学工程学院, 嘉兴 314001  
高越 嘉兴学院生物与化学工程学院, 嘉兴 314001  
李世慧 嘉兴学院生物与化学工程学院, 嘉兴 314001  
吕春欣 南京大学化学化工学院, 配位化学国家重点实验室, 南京 210023
嘉兴学院生物与化学工程学院, 嘉兴 314001 
chunxin0923@163.com 
摘要: 以六水合硝酸锌和六水合硝酸铈(Ⅲ)为原料,通过共沉淀法制备了一系列稀土Ce掺杂的纳米ZnO,并采用X射线粉末衍射(XRD)、傅里叶红外光谱(IR)、扫描电镜(SEM)、X射线能谱分析(EDS)、紫外可见漫反射光谱对其进行了全面表征。部分样品还通过X射线光电子能谱(XPS)和光致荧光光谱(PL)进行了进一步分析。分别在日光和紫外光条件下,对这一系列Ce掺杂的ZnO进行了光催化降解亚甲基蓝的性能研究,得出当Ce的掺杂量为3%(n/n)时(ZnO-3% Ce),其光催化活性最佳,光催化降解亚甲基蓝的效率均超过98%。选取ZnO-3% Ce作为催化剂,分别进一步考察其在日光和紫外光下对罗丹明B和甲基橙的光催化降解性能。研究结果表明,ZnO-3% Ce在日光和紫外光下均表现出较好的光催化降解效果,体现出良好的光降解普适性。日光下光降解效率顺序为:亚甲基蓝 > 罗丹明B > 甲基橙,而紫外光下降解效率顺序为:罗丹明B > 亚甲基蓝 > 甲基橙。最后,我们研究了催化剂ZnO-3% Ce的循环利用及稳定性性能。实验结果表明:该催化剂循环使用3次之后,光催化效率仍然稳定在97%以上,并且其结构和组成保持不变,体现出优异的稳定性和应用前景。
关键词: 纳米氧化锌  稀土元素  掺杂  光催化  降解  染料
基金项目: 中国博士后科学基金项目(No.2017M621697)和浙江省自然科学基金一般项目(No.LY18B010007)资助
Abstract: A series of nano-ZnO doped with different amounts of cerium were prepared by co-precipitation method with Zn(NO3)2·6H2O and Ce(NO3)3·6H2O as raw materials. The as-made samples were characterized by powder X-ray diffraction (XRD), infrared spectroscopy (IR), scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and UV-visible diffuse reflectance spectroscopy (UV-Vis DRS). Some samples were further characterized by X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL). Photocatalytic activity of these materials toward photodegradation of methylene blue (MB) was evaluated under UV and sunlight irradiation, respectively. It was found that the sample with 3% Ce3+ doped ZnO, named as ZnO-3% Ce, exhibited highest photocatalytic activity among the prepared samples and its MB-degradation efficiency was over 98%. Then, the sample of ZnO-3% Ce was selected to further evaluate its photocatalytic activity toward photodegradation of rhodamine B (RhB) and methyl orange (MO) under both UV and sunlight irradiation. The results showed that the sample of ZnO-3% Ce presented good photodegradation activity under both UV and sunlight condition. The order of photodegradation efficiency under sunlight irradiation was as follows:MB > RhB > MO, while the photocatalytic activity under UV irradiation was increased by the following order RhB > MB > MO. The stability of ZnO-3%Ce catalyst was studied by cyclic experiments. The results showed that the photodegradation efficiency still retained more than 97% after three cycles, suggesting that the catalyst maintained its structure and component and presented good stability and application prospect.
Keywords: nano-ZnO  rare earth element  doping  photocatalysis  degradation  dyes
投稿时间:2019-08-29 修订日期:2019-10-15
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钟伟,夏颖帆,翟杭玲,高越,李世慧,吕春欣.共沉淀法制备稀土Ce掺杂的纳米ZnO及其光催化降解染料的性能[J].无机化学学报,2020,36(1):40-52.
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