磁性AgBr/Ag3PO4/ZnFe2O4复合催化剂的制备及光催化性能

doi:10.3866/PKU.WHXB201605081

物理化学学报 >> 2016, Vol. 32 >> Issue (8): 2077-2083.doi: 10.3866/PKU.WHXB201605081

磁性AgBr/Ag₃PO₄/ZnFe₂O₄复合催化剂的制备及光催化性能

孟英爽¹,安逸²,郭谦¹,葛明^1,^3,*()

¹ 华北理工大学化学工程学院,河北唐山063009
² 华北理工大学以升创新教育基地,河北唐山063009
³ 河北省环境光电催化材料重点实验室,河北唐山063009

收稿日期:2016-02-23 发布日期:2016-07-29
通讯作者: 葛明 E-mail:geminggena@163.com
基金资助:
河北省自然科学基金(B2014209182);河北省教育厅青年基金(QN2014045);华北理工大学大学生创新创业训练计划项目(X2015117)

Synthesis and Photocatalytic Performance of a Magnetic AgBr/Ag₃PO₄/ZnFe₂O₄ Composite Catalyst

Ying-Shuang MENG¹,Yi AN²,Qian GUO¹,Ming GE^1,^3,*()

¹ College of Chemical Engineering, North China University of Science and Technology, Tangshan 063009, Hebei Province, P. R. China
² Yisheng Innovation Education Base, North China University of Science and Technology, Tangshan 063009, Hebei Province, P. R.China
³ Hebei Key Laboratory of Photocatalytic and Electrocatalytic Materials for Environment, Tangshan 063009, Hebei Province, P. R. China

Received:2016-02-23 Published:2016-07-29
Contact: Ming GE E-mail:geminggena@163.com
Supported by:
the Natural Science Foundation of Hebei Province, China(B2014209182);Youth Foundation of Hebei Education Department, China(QN2014045);College Students′Innovative Entrepreneurial Training Plan Program of North China University of Science and Technology, China(X2015117)

摘要/Abstract

摘要：

水热法结合原位沉淀法成功制备新型磁性溴化银/磷酸银/铁酸锌(AgBr/Ag₃PO₄/ZnFe₂O₄)复合催化剂，并通过X射线衍射、能量色散X射线、场发射扫描电子显微镜、透射电子显微镜和紫外-可见漫反射光谱对其晶相结构、组成、形貌及吸光性能进行了表征。在可见光照射下，所制备的AgBr/Ag₃PO₄/ZnFe₂O₄复合催化剂光催化降解罗丹明B (RhB)的活性优于Ag3PO4/ZnFe₂O₄、AgBr/ZnFe₂O₄和P25 TiO₂。在酸性和碱性溶液中，AgBr/Ag₃PO₄/ZnFe₂O₄光催化剂呈现出优良光催化性能。在AgBr/Ag₃PO₄/ZnFe₂O₄体系中，光催化降解RhB的速率随着反应体系温度的升高而增大，由阿伦尼乌斯方程计算获得反应体系活化能为31.9 kJ·mol^-1。AgBr/Ag₃PO₄/ZnFe₂O₄复合材料优异的可见光催化活性归因于光生电荷的有效分离，所产生的超氧自由基和空穴是RhB降解的主要活性物种。

关键词: AgBr/Ag₃PO₄/ZnFe₂O₄, 磁性, 光催化, 可见光, 机理

Abstract:

Hydrothermal processing in conjunction with in situ precipitation were successfully applied to synthesize the magnetic composite catalyst silver bromide/silver phosphate/zinc ferrite (AgBr/Ag₃PO₄/ZnFe₂O₄). The phase structure, composition, morphology, and optical property of this material were subsequently assessed by X-ray diffraction, energy dispersive X-ray spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, and UV-Vis diffuse reflectance spectroscopy. Under visible light illumination, the as-prepared AgBr/Ag₃PO₄/ZnFe₂O₄ photocatalyst exhibited superior photocatalytic performance during rhodamine B (RhB) degradation compared with Ag3PO4/ZnFe₂O₄, AgBr/ZnFe₂O₄, and P25 TiO₂. This new catalyst also showed excellent photocatalytic activity in both acidic and basic solutions. The RhB photodegradation rate was slightly increased at higher temperatures, and the activation energy for this reaction was determined to be 31.9 kJ·mol^-1 according to the Arrhenius equation. The high performance of the AgBr/Ag₃PO₄/ZnFe₂O₄ catalyst can be attributed to efficient photo-induced charge separation, and the generation of superoxide radicals and holes that are responsible for RhB degradation.

Key words: AgBr/Ag₃PO₄/ZnFe₂O₄, Magnetism, Photocatalysis, Visible light, Mechanism

MSC2000:

O644

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孟英爽,安逸,郭谦,葛明. 磁性AgBr/Ag₃PO₄/ZnFe₂O₄复合催化剂的制备及光催化性能[J]. 物理化学学报, 2016, 32(8): 2077-2083.

Ying-Shuang MENG,Yi AN,Qian GUO,Ming GE. Synthesis and Photocatalytic Performance of a Magnetic AgBr/Ag₃PO₄/ZnFe₂O₄ Composite Catalyst[J]. Acta Phys. -Chim. Sin., 2016, 32(8): 2077-2083.

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磁性AgBr/Ag₃PO₄/ZnFe₂O₄复合催化剂的制备及光催化性能

Synthesis and Photocatalytic Performance of a Magnetic AgBr/Ag₃PO₄/ZnFe₂O₄ Composite Catalyst

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