| BiOCl/TiO_2复合材料的可见光活性及机理研究 |
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| 引用本文： | 王磊,王志军,王玉廷,游俊琴,任川齐,高晓强.BiOCl/TiO_2复合材料的可见光活性及机理研究[J].环境科学学报,2015,35(1):222-228. |
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| 作者姓名： | 王磊 王志军 王玉廷 游俊琴 任川齐 高晓强 |
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| 作者单位： | 防化研究院, 国民核生化灾害防护国家重点实验室, 北京 100191;防化研究院, 国民核生化灾害防护国家重点实验室, 北京 100191;海军陆战学院, 广州 510430;防化研究院, 国民核生化灾害防护国家重点实验室, 北京 100191;防化研究院, 国民核生化灾害防护国家重点实验室, 北京 100191;防化研究院, 国民核生化灾害防护国家重点实验室, 北京 100191 |
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| 摘 要： | 采用水热法和溶胶凝胶法制备新型BiOCl/TiO2复合材料并明确了最优的掺杂比例(2%).随后利用X射线衍射(XRD)、紫外可见漫反射(DRS)、透射电镜(TEM)和X射线光电子能谱(XPS)对该材料进行表征.由于禁带宽度较大,纯BiOCl和TiO2的可见光催化性能极差,然而二者复合后,同条件下的苯降解率却大幅提升,可以达到40%以上.经证实,催化剂制备过程中,Bi的状态发生变化,在TiO2导、价带之间插入新的能级,使其禁带宽度变窄,电子可以实现可见光跃迁.
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| 关 键 词： | BiOCl TiO2 可见光 光催化 机理 |
| 收稿时间： | 4/9/2014 12:00:00 AM |
| 修稿时间： | 2014/6/23 0:00:00 |
Photocatalytic ability and mechanism of BiOCl/TiO2 under visible light |
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| WANG Lei,WANG Zhijun,WANG Yuting,YOU Junqin,REN Chuanqi and GAO Xiaoqiang.Photocatalytic ability and mechanism of BiOCl/TiO2 under visible light[J].Acta Scientiae Circumstantiae,2015,35(1):222-228. |
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| Authors: | WANG Lei WANG Zhijun WANG Yuting YOU Junqin REN Chuanqi and GAO Xiaoqiang |
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| Affiliation: | State Key Laboratory of NBC Protection for Civilian, Research Institute of Chemical Defence, Beijing 100191;State Key Laboratory of NBC Protection for Civilian, Research Institute of Chemical Defence, Beijing 100191;Navy Marine Academy, Guangzhou 510430;State Key Laboratory of NBC Protection for Civilian, Research Institute of Chemical Defence, Beijing 100191;State Key Laboratory of NBC Protection for Civilian, Research Institute of Chemical Defence, Beijing 100191;State Key Laboratory of NBC Protection for Civilian, Research Institute of Chemical Defence, Beijing 100191 |
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| Abstract: | BiOCl/TiO2 is obtained via hydrothermal and sol-gel method with the optimal proportion of 2%. The compounds are characterized by X-ray diffraction (XRD), UV-Vis diffuse reflectance spectra (DRS) and transmission electron microscopy (TEM). The photocatalytic degradation towards gas-phase benzene is over 40% under visible light irradiation, which is much better than pure TiO2 and BiOCl indivial. It`s proven that the status of Bi has changed during the preparation of BiOCl/TiO2, which may insert a new energy level between valence and conduction band of BiOCl. As a result, electrons can be excited by visible light and jump to conduction band through the new band structure. Photo-carriers are then isolated on different sides of the heterojunction to reduce the recombination and the amount of generated *O2- and *OH free radicals increase significantly. |
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| Keywords: | BiOCl TiO2 visible light photocatalysis mechanism |
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