锌掺杂OV-β-Bi2O3可见光催化活性的提高:能带结构的调节和电荷分离的促进
Enhancement of Visible-Light Catalytic Activity for Zn Doped OV-β-Bi2O3: Regulation of Electronic Structure and Promotion of Charge Separation
作者单位E-mail
赵亚雯 河南大学化学化工学院, 河南省环境污染控制材料国际联合实验室, 开封 475004  
张俊可 河南大学化学化工学院, 河南省环境污染控制材料国际联合实验室, 开封 475004  
冯彩霞 河南大学化学化工学院, 河南省环境污染控制材料国际联合实验室, 开封 475004 caixia8079@henu.edu.cn 
徐佳鹏 河南大学化学化工学院, 河南省环境污染控制材料国际联合实验室, 开封 475004  
杜芮 河南大学化学化工学院, 河南省环境污染控制材料国际联合实验室, 开封 475004  
虎华 河南省开封生态环境监测中心, 开封 475003  
周艳梅 河南大学化学化工学院, 河南省环境污染控制材料国际联合实验室, 开封 475004 zhouym@henu.edu.cn 
刘山虎 河南大学化学化工学院, 河南省环境污染控制材料国际联合实验室, 开封 475004  
刘艳红 中国科学院理化技术研究所, 北京 100190  
摘要: 采用溶胶-凝胶-原位碳热还原处理的方法,制备了一种含有氧空位(OV)的新型Zn掺杂β-Bi2O3纳米材料(OV-Zn:Bi2O3),氧空位的浓度可以通过改变Zn2+的掺杂量进行调节。作为参照,只有氧空位没有Zn2+的新型β-Bi2O3(OV-β-Bi2O3)也通过类似的方法制得。通过紫外可见漫反射光谱、X射线光电子能谱、电子顺磁共振、光致发光光谱和光电化学测试,系统研究了氧空位和Zn2+掺杂对OV-Zn:Bi2O3降解亚甲基蓝(MB)和2,4,6-三氯苯酚(2,4,6-TCP)可见光催化活性的综合影响。结果表明,氧空位的引入不仅可以使光吸收向长波方向拓展,而且可以促进光生载流子的分离。因此,与传统的β-Bi2O3相比,OV-β-Bi2O3对亚甲基蓝(MB)和2,4,6-三氯苯酚(2,4,6-TCP)的降解活性显著增强。对于OV-Zn:Bi2O3催化剂,Zn2+掺杂可使光催化剂的价带边缘向下移动,增强了光激发空穴的氧化能力,并且适量的锌掺杂也能提高光生载流子的分离效率。因此,OV-Zn:Bi2O3的可见光活性优于OV-β-Bi2O3,而且当Zn与Bi物质的量之比为0.3时,OV-Zn:Bi2O3-0.3对MB和2,4,6-TCP的降解活性最高。
关键词: 氧空位  锌离子掺杂  光催化  电荷分离  可见光活性
基金项目: 河南省科技攻关项目(No.19A150020)、河南省高校科技创新团队计划(No.19IRTSTHN029)、河南省创新创业培训计划(No.S202010475087)和开封市科技发展计划项目(No.1808001)资助。
Abstract: A novel Zn-doped β-Bi2O3 nanomaterial (OV-Zn:Bi2O3) with two crystal defects, oxygen vacancy (OV) and doped Zn2+, was prepared via a sol-gel method followed by in-situ carbon thermal reduction treatment. The concentration of OV of OV-Zn:Bi2O3 sample can be modulated by regulating the content of doped Zn2+. As a reference, the novel β-Bi2O3 having OV but without doped Zn2+ (OV-β-Bi2O3) was also synthesized via a similar process. The comprehensive effect of OV and doped Zn2+ on the visible-light-activity of OV-Zn:Bi2O3 for the degradation of methylene blue (MB) and 2,4,6-trichlorophenol (2,4,6-TCP) was investigated by ultraviolet-visible light diffuse reflectance spectra, X-ray photoelectron spectra, electron spin resonance, photoluminescence spectrum and photoelectrochemical measurements. The results show that introduction of OV can not only drastically extend the photoabsorption into longer wavelength region but also promote the separation of photo-generated charge carriers. So, compared to traditional β-Bi2O3, OV-β-Bi2O3 demonstrated highly promoted activity for the degradation of methylene blue (MB) and 2,4,6-trichlorophenol (2,4,6-TCP). For OV-Zn:Bi2O3 catalysts, Znic doping can make the valence band edge of catalysts move down and the oxidation ability of photo-excited holes increase. And appropriate amount of zinc doping can also improve the separation efficiency of photogenerated carriers. In contrast to OV-β-Bi2O3, the visible light activity of OV-Zn:Bi2O3 was further improved and OV-Zn:Bi2O3-0.3 with a molar ratio (nZn/nBi) of 0.3 exhibited the highest activity for the degradation of MB and 2,4,6-TCP.
Keywords: oxygen vacancy  Zn2+ doping  photocatalysis  charge separation  visible light activity
投稿时间:2020-09-10 修订日期:2021-01-05
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赵亚雯,张俊可,冯彩霞,徐佳鹏,杜芮,虎华,周艳梅,刘山虎,刘艳红.锌掺杂OV-β-Bi2O3可见光催化活性的提高:能带结构的调节和电荷分离的促进[J].无机化学学报,2021,37(3):541-554.
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Support information: 相关附件:   file200428_Supplementary_material.doc