n-p异质结型CdS/BiOBr复合光催化剂的制备及性能

doi:10.7503/cjcu20160837

高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (7): 1249.doi: 10.7503/cjcu20160837

n-p异质结型CdS/BiOBr复合光催化剂的制备及性能

高晓明(), 代源, 费娇, 张裕, 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

收稿日期:2016-11-28 出版日期:2017-07-10 发布日期:2017-06-20
作者简介:联系人简介: 高晓明, 男, 博士, 副教授, 主要从事环境催化和能源化工研究. E-mail: dawn1026@163.com
基金资助:
国家自然科学基金(批准号: 21406188)、陕西省教育厅项目(批准号: 14JS111)和延安市科技局项目(批准号: 2016CGZH-10)资助

Synthesis of n-p Heterojunction BiOBr/CdS Composites with Enhanced Photocatalytic Properties^†

GAO Xiaoming^*(), DAI Yuan, FEI Jiao, ZHANG Yu, FU Feng

School of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan’an University, Yan’an 716000, China

Received:2016-11-28 Online:2017-07-10 Published:2017-06-20
Contact: GAO Xiaoming E-mail:dawn1026@163.com
Supported by:
† Supported by the National Natural Science Foundation of China(No.21406188), the Foundation of Shaanxi Educational Committee, China(No.14JS111) and the Foundtion of Yanan Science and Technology Bureau, China(No.2016CGZH-10)

摘要/Abstract

摘要：

采用两步水热法制备了CdS/BiOBr复合光催化剂, 并通过X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和紫外-可见漫反射光谱(UV-Vis DRS)等手段对其物相、表面结构、光响应性等性质进行了表征. 结果表明, 合成的CdS/BiOBr复合材料是n-p型异质结, 由CdS颗粒裹附在BiOBr纳米球的表面构成, 这种结构不仅具有良好的可见光响应范围, 且有利于光生电子的迁移, 并有效地抑制光生电子/空穴对的复合. 通过光催化降解模拟染料废水和光催化脱除模拟含硫燃料评价了CdS/BiOBr复合材料的可见光催化性能. 结果表明, 6%(质量分数) CdS/BiOBr降解次甲基蓝的拟一级动力学常数分别为BiOBr和CdS的5.3和9.6倍, 脱除噻吩的拟一级动力学常数分别为BiOBr和CdS的1.9和3.2倍. CdS/BiOBr具有良好的光催化稳定性, 循环使用5次后, 降解率仍能达到90%以上.

关键词: CdS/BiOBr复合光催化剂, 异质结, 次甲基蓝, 脱硫, 光催化

Abstract:

CdS/BiOBr composite was prepared by two-step hydrothermal method, and the phase, surface structure and light response were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), UV-Vis diffuse reflectance spectrometry(UV-Vis DRS). The results show that CdS/BiOBr composite is n-p type heterojunction, which is composed of spherical CdS particles coated on the surface of BiOBr nanoleaflets. This structure broadens the response range to visible light, and effectively suppresses the recombination of photogenerated electron/hole pair. The photocatalytic performance was investigated by degradation of simulated dye wastewater and photocatalytic desulfurization of simulated fuel under visible light illumination. The results show that the pseudo-first order kinetic constants of degradation of methylene blue(MB) on 6%CdS/BiOBr are 9.6 and 5.3 times of CdS and BiOBr, and the pseudo-first order kinetic constants of desulfurization on 6%CdS/BiOBr are 1.9 and 3.2 times that of BiOBr and CdS, respectively. CdS/BiOBr has good photocatalytic stability, and the degradation rate of MB can still reach more than 90% after recycling 5 times.

Key words: CdS/BiOBr composite photocatalyst, Heterojunction, Methylene blue, Desulfurization, Photocatalysis

中图分类号:

O644

TrendMD:

高晓明, 代源, 费娇, 张裕, 付峰. n-p异质结型CdS/BiOBr复合光催化剂的制备及性能. 高等学校化学学报, 2017, 38(7): 1249.

GAO Xiaoming, DAI Yuan, FEI Jiao, ZHANG Yu, FU Feng. Synthesis of n-p Heterojunction BiOBr/CdS Composites with Enhanced Photocatalytic Properties^†. Chem. J. Chinese Universities, 2017, 38(7): 1249.

图/表 10

Scheme 1 Schematic illustration of the formation mechanism of CdS/BiOBr

Fig.1 XRD patterns of 2%CdS/BiOBr(a), 4%CdS/BiOBr(b), 6%CdS/BiOBr(c) and 8%CdS/BiOBr(d)

Fig.2 X-Ray photoelectron spectra of 6%CdS/BiOBr(A) Bi4f; (B) O1s; (C) Br3d; (D) Cd3d; (E) S2p.

Fig.3 SEM images of CdS(A), BiOBr(B), 6%CdS/BiOBr(C) and TEM image of 6%CdS/BiOBr(D)

Fig.4 EDS spectrum of 6%CdS/BiOBr

Fig.5 UV-Vis spectra of 2%CdS/BiOBr(a), 4%CdS/BiOBr(b), 6%CdS/BiOBr(c) and 8%CdS/BiOBr(d)The inset shows the relation ship between (Ahν)2 and photo energy.

Fig.6 Temporal UV-Vis absorption spectral changes during the photo-degradation of MB in aqueous solution in the presence of 6%CdS/BiOBr(A) and degradation rate of MB without catalyst(a) and in the presence of CdS(b), BiOBr(c) and 6%CdS/BiOBr(d) under visible light illumination(B)

Fig.9 Effect of reuse of 6%CdS/BiOBr on the degradation rate of MB

Fig.10 Effects of different scavengers on the degradation of MB by CdS/BiOBr compositeScavenger: a. blank; b. BQ; c. EDTA; d. IPA.

Fig.11 Photocatalysis degradation process of MB by CdS/BiOBr composite

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n-p异质结型CdS/BiOBr复合光催化剂的制备及性能

Synthesis of n-p Heterojunction BiOBr/CdS Composites with Enhanced Photocatalytic Properties^†

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n-p异质结型CdS/BiOBr复合光催化剂的制备及性能

Synthesis of n-p Heterojunction BiOBr/CdS Composites with Enhanced Photocatalytic Properties†

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Synthesis of n-p Heterojunction BiOBr/CdS Composites with Enhanced Photocatalytic Properties^†