MnWO_(4)/WO_(3)的制备及其光催化性能的研究  

Preparation of MnWO_(4)/WO_(3) and its photocatalytic performance

作　　者：尚贞晓[1] 袁佳钰 王凯玫 李梦红[1] SHANG Zhenxiao;YUAN Jiayu;WANG Kaimei;LI Menghong(School of Resources and Environment Engineering,Shandong University of Technology,Shandong Zibo 255000,China)

机构地区：[1]山东理工大学资源与环境工程学院,山东淄博255000

出　　处：《化学工业与工程》2022年第5期11-20,共10页Chemical Industry and Engineering

基　　金：国家自然科学基金项目(41771348)。

摘　　要：光催化技术在解决环境污染和能源危机方面有着巨大的应用潜力,采用浸渍、焙烧的方法制备了一系列MnWO_(4)含量不同的MnWO_(4)/WO_(3)复合光催化剂。利用XRD、SEM、TEM、HR-TEM、BET等方法对MnWO_(4)/WO_(3)复合光催化剂的结构形貌进行表征。通过光催化分解水产氧以及降解四环素来评价其光催化活性。通过能带结构、表面光电压(SPV)、荧光(PL)和活性物种实验分析MnWO_(4)/WO_(3)复合光催化剂的光催化活性增强机制。实验结果表明,所有MnWO_(4)/WO_(3)样品的光催化活性较纯WO_(3)样品都有提高,且随着MnWO_(4)含量的增加呈现先增高后下降的趋势,Mn-WO_(4)含量为3%的MnW-2样品表现出最优的光催化活性,其氧气产量为89.26μmol,为WO_(3)纯样的3.45倍,对四环素的降解率达到了92.1%,一级反应动力学常数为WO_(3)纯样的8.98倍。通过对其能带结构及光生电子和空穴的分离效率进行分析发现,样品的光催化活性变化主要是由于光生载流子分离效率改变导致。Photocatalytic technology has showed great potential in environmental remediation and clean energy production.Herein,a series of MnWO_(4)/WO_(3)composite photocatalysts with different contents of MnWO_(4)were prepared by impregnation and calcination method.The structure and morphology of Mn-WO_(4)/WO_(3)composite photocatalysts were characterized by XRD,SEM,TEM,HR-TEM and BET.The photocatalytic activity was evaluated by photocatalytic oxygen evolution from water decomposition and degradation of tetracycline.The enhanced photocatalytic activity mechanism of MnWO_(4)/WO_(3)composite photocatalysts was analyzed by energy band structure,SPV,PL,and active species experiment.In the experiments of oxygen evolution from water spliting and degradation of organic pollutants,the photocatalytic activity of all MnWO_(4)/WO_(3)samples was higher than that of pure WO_(3),with the increase of MnWO_(4)content,photocatalytic activity showed a trend of increasing firstly and then decreasing,MnW-2 sample with 3%MnWO_(4)content exhibited the best photocatalytic performance.89.26μmol O_(2)was produced in 6 h under simulated sunlight irradiation,which was 3.45 times as much as that of pure WO_(3).The degradation rate of tetracycline reached 92.1%,and its first-order inetic constants were 8.98 times of pure WO_(3).Through the analysis of the energy band structure and the separation efficiency of photogenerated electrons and holes,it is found that the change of photocatalytic activity of MnWO_(4)/WO_(3) samples is mainly caused by the varying of the separation efficiency of photogenerated carriers.

关 键 词：MnWO_(4)/WO_(3) 光催化 产氧 四环素 分离效率 

分 类 号：TQ50.4[化学工程]