p-n异质结型光催化剂BiOBr/NaBiO3的制备与可见光催化活性

doi:10.7503/cjcu20140339

高等学校化学学报 ›› 2014, Vol. 35 ›› Issue (10): 2170.doi: 10.7503/cjcu20140339

p-n异质结型光催化剂BiOBr/NaBiO₃的制备与可见光催化活性

姬磊(), 王浩人, 于瑞敏

东北石油大学化学化工学院, 石油与天然气化工省高校重点实验室, 大庆 163318

收稿日期:2014-04-10 出版日期:2014-10-10 发布日期:2014-09-19
作者简介:联系人简介: 姬磊, 女, 博士, 副教授, 主要从事光催化材料的制备、表征及光催化机理研究. E-mail: jileiwipm@163.com
基金资助:
黑龙江省普通高等学校青年学术骨干支持计划(批准号: 1251G002)、东北石油大学青年科学基金(批准号: 2012QN114)和黑龙江省普通高校石油与天然气化工重点实验室开放基金(批准号: HXHG2012-0)资助

Preparation, Characterization and Visible-light Photocatalytic Activities of p-n Heterojunction BiOBr/NaBiO₃ Composites^†

JI Lei^*(), WANG Haoren, YU Ruimin

Provincial Key Laboratory of Oil and Gas Chemical Technology, College of Chemistry and Chemical Engineering,Northeast Petroleum University, Daqing 163318, China

Received:2014-04-10 Online:2014-10-10 Published:2014-09-19
Contact: JI Lei E-mail:jileiwipm@163.com
Supported by:
Supported by the College Young Scholar Supporting Project for Heilongjiang Institutions of Higher Education, China(No.1251G002), the Science Found for Young Scholars of Northeast Petroleum University, China(No.2012QN114), and the Open Fund of Key Laboratory of Petroleum and Natural Gas Chemical Industry for Heilongjiang Colleges and Universities, China(No.HXHG2012-0)

摘要/Abstract

摘要：

采用化学蚀刻法在NaBiO₃表面利用HBr与NaBiO₃的反应原位沉积BiOBr, 制备了异质结型光催化剂. 利用X射线粉末衍射仪(XRD)、紫外-可见漫反射光谱仪(UV-Vis DRS)和扫描电子显微镜(SEM)等对其相结构、微观形貌和光吸收性能进行了表征. 光催化实验结果表明, BiOBr/NaBiO₃在可见光下可以有效降解罗丹明B(RhB)溶液, 当BiOBr与NaBiO₃的摩尔比为40.1%时, BiOBr/NaBiO₃具有最大催化活性. 通过不同牺牲剂的加入及荧光实验结果推测了该异质结型材料光催化过程中光生载流子的传输方向及活性物种. 研究结果表明, BiOBr/NaBiO₃催化活性的增强主要归结为两者之间形成了有效的异质结, 其内建电场能够促进光生载流子的分离, 同时h⁺在光催化降解过程中是主要的活性物种.

关键词: 光催化, BiOBr/NaBiO3, 异质结

Abstract:

BiOBr/NaBiO₃ heterostructures were synthesized by a simple chemical etching method using hydrobromic acid as etching agent to react with NaBiO₃. X-ray powder diffraction(XRD), UV-Vis diffuse reflectance spectra(UV-Vis DRS) and scanning electron microscope(SEM) were employed to study the phase structures, morphologies and optical properties of the samples. The as-prepared samples exhibited more efficient photocatalytic activities than pure NaBiO₃ and BiOBr for the degradation of Rhodamine B(RhB) under visible light irradiation, which could be attributed to the efficient separation of electron-hole pairs caused by the formation of BiOBr/NaBiO₃ heterojunction. Terephthalic acid photoluminescence(TA-PL) probing test and radicals scavenger experiments demonstrated that h⁺ was the dominant reactive species while the effect of ·OH and · $O 2 -$ was negligible. A possible transfer process of photogenerated carriers was proposed based on the band structures of NaBiO₃ and BiOBr and the experimental results.

Key words: Photocatalysis, BiOBr/NaBiO3, Heterojunction(Ed.: S, Z, M)

中图分类号:

O643.31

TrendMD:

姬磊, 王浩人, 于瑞敏. p-n异质结型光催化剂BiOBr/NaBiO₃的制备与可见光催化活性. 高等学校化学学报, 2014, 35(10): 2170.

JI Lei, WANG Haoren, YU Ruimin. Preparation, Characterization and Visible-light Photocatalytic Activities of p-n Heterojunction BiOBr/NaBiO₃ Composites^†. Chem. J. Chinese Universities, 2014, 35(10): 2170.

图/表 8

Fig.1 XRD patterns of NaBiO3(a), 10.5%BiOBr/NaBiO3(b), 23.6%BiOBr/NaBiO3(c), 40.1%BiOBr/NaBiO3(d), 61.7%BiOBr/NaBiO3(e) and BiOBr(f)

Fig.2 SEM of NaBiO3(A), 10.5%BiOBr/NaBiO3(B), 60.1%BiOBr/NaBiO3(C) and BiOBr(D)

Fig.3 UV-Vis diffuse reflectance spectra(A) and band gaps(B) of different samples a. NaBiO3; b. 10.5%BiOBr/NaBiO3; c. 23.6%BiOBr/NaBiO3; d. 40.1%BiOBr/NaBiO3; e. 61.7%BiOBr/NaBiO3; f. BiOBr.

Fig.4 Dark adsorption and visible light-induced photocatalytic degradation of RhB over different samples a. NaBiO3; b. 10.5%BiOBr/NaBiO3; c. 23.6%BiOBr/NaBiO3; d. 40.1%BiOBr/NaBiO3; e. 61.7%BiOBr/NaBiO3; f. BiOBr.

Fig.5 kapp values of different samples a. NaBiO3; b. 10.5%BiOBr/NaBiO3; c. 23.6%BiOBr/NaBiO3; d. 40.1%BiOBr/NaBiO3; e. 61.7%BiOBr/NaBiO3; f. BiOBr.

Fig.6 kapp values of 40.1%BiOBr/NaBiO3with different quenchers

Fig.7 ·OH trapping PL spectra during irradiation of samples in 5×10-4 mol/L terephthlic acid solution(λex=315 nm, A) and PL spectra of 40.1%BiOBr/NaBiO3(B) (A) a. NaBiO3; b. 10.5%BiOBr/NaBiO3; c. 23.6%BiOBr/NaBiO3; d. 40.1%BiOBr/NaBiO3; e. 61.7%BiOBr/NaBiO3; f. BiOBr. (B) t/min: a. 0; b. 60; c. 120; d. 180.

Fig.8 Diagram of the band energy of BiOBr and NaBiO3 before contact(A) and formation of a p-n junction and the proposed charge separation process of BiOBr/NaBiO3 heterostructures under visible light irradiation(B)

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p-n异质结型光催化剂BiOBr/NaBiO₃的制备与可见光催化活性

Preparation, Characterization and Visible-light Photocatalytic Activities of p-n Heterojunction BiOBr/NaBiO₃ Composites^†

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