Bi2WO6量子点(QDs)修饰Bi2MoO6-xF2x异质结的构筑及其催化活性增强机理
Construction of Bi2WO6 Quantum Dots (QDs) Decorated Bi2MoO6-xF2x Heterostructures with Enhanced Photocatalytic Activity
作者单位E-mail
王丹军 延安大学化学与化工学院, 陕西省化学反应工程重点实验室, 延安 716000 wangdj761118@163.com 
申会东 延安大学化学与化工学院, 陕西省化学反应工程重点实验室, 延安 716000  
付梦溪 延安大学化学与化工学院, 陕西省化学反应工程重点实验室, 延安 716000;西安工业大学, 材料与化工学院, 西安 710021  
王婵 延安大学化学与化工学院, 陕西省化学反应工程重点实验室, 延安 716000  
郭莉 延安大学化学与化工学院, 陕西省化学反应工程重点实验室, 延安 716000  
杨晓 延安大学化学与化工学院, 陕西省化学反应工程重点实验室, 延安 716000  
付峰 延安大学化学与化工学院, 陕西省化学反应工程重点实验室, 延安 716000  
摘要: 采用简单沉积-沉淀法合成了Bi2WO6@Bi2MoO6-xF2x(BWO/BMO6-xF2x)异质结,借助XRD、XPS、TEM、SEM、EDS、UV-Vis-DRS、PC和EIS等测试技术对其组成、形貌、光吸收特性和光电化学性能等进行系统表征,并以模型污染物罗丹明B(RhB)的光催化降解作为探针反应来评价Bi2WO6@Bi2MoO6-xF2x异质结的光催化活性增强机制。形貌分析表明,所得Bi2MoO6微球由大量厚度为20~50 nm的纳米片组成;FE-SEM和HR-TEM分析表明,尺寸约为10 nm的Bi2WO6量子点均匀沉积在Bi2MoO6-xF2x微球表面,形成新颖的Bi2WO6@Bi2MoO6-xF2x异质结;与纯Bi2MoO6或者Bi2WO6相比,1:1Bi2WO6@Bi2MoO6-xF2x异质结表现出更好的光催化活性和光电流性质,其对RhB光催化降解的表观速率常数分别为纯BMO和BWO的6.4和11.6倍。PC和EIS图谱分析表明,Bi2WO6量子点表面沉积显著提高Bi2MoO6-xF2x光生电子/空穴的分离效率和迁移速率;活性物种捕获实验证明了·O2-和h+是主要的活性物种。根据实验结果,探讨了F-掺杂和Bi2WO6量子点之间的协同效应对Bi2MoO6的光催化活性的影响机制。
关键词: 沉积-沉淀法  量子点修饰  Bi2WO6/Bi2MoO6-xF2x异质结  光催化  协同效应
基金项目: 国家自然科学基金(No.21666039,21663030),陕西省科技厅基金(No.2013SZS20-P01,2015SF291),陕西省教育厅基金项目(No.15JS119)和陕西省大学生创新创业训练计划项目(No.1517,1563)资助。
Abstract: Bi2WO6@Bi2MoO6-xF2x heterostructures have been successfully synthesized via a facile precipitation-deposition process. XRD, XPS, FE-SEM, HR-TEM, EDS, UV-Vis-DRS, PC and EIS techniques were employed to analyze the phase composition, morphology, light absorption and photoelectrochemical properties of as-synthesized samples. Photocatalytic degradation of model pollutant RhB was selected as a probe reaction to investigate the photocatalytic activities enhanced mechanism of Bi2WO6@Bi2MoO6-xF2x heterostructures. The morphology analysis indicated that the as-synthesized Bi2MoO6 microsphere is composed of massive nanoplate with the thickness of 20~50 nm, and monodispersed Bi2WO6 quantum dots (QDs) with an average size of 10 nm was deposited on the surface of Bi2MoO6 microsphere. Comparison to pure Bi2MoO6 and Bi2WO6, 1:1Bi2WO6@Bi2MoO6-xF2x heterostructures exhibits the best photocatalytic activity and photoelectrochemical property. The transient photocurrent responses and EIS spectra analysis results indicate that Bi2WO6 QDs deposition can improve the separation sufficiency and migration rate of photogeneraged electrons/holes. The radical scavengers test further confirm that·O2- and h+ are the main reactive species during the photocatalytic process. On the basis of experimental results, the mechanism of the enhanced photocatalytic activity for Bi2WO6@Bi2MoO6-xF2x heterostructure via synergistic effect of F- doping and Bi2WO6 QDs deposition co-modification was also discussed.
Keywords: precipitation-deposition process  quantum dots (QDs) decoration  Bi2WO6/Bi2MoO6-xF2x heterostructure  synergistic effect  photocatalysis  synergistic effect
投稿时间:2017-08-04 修订日期:2017-10-10
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王丹军,申会东,付梦溪,王婵,郭莉,杨晓,付峰.Bi2WO6量子点(QDs)修饰Bi2MoO6-xF2x异质结的构筑及其催化活性增强机理[J].无机化学学报,2018,34(1):73-82.
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