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

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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. 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 GE1,3,*()   

  1. 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:

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