物理化学学报 >> 2014, Vol. 30 >> Issue (11): 2107-2112.doi: 10.3866/PKU.WHXB201409041

催化和表面科学 上一篇    下一篇

Ag3PO4/BiVO4复合光催化剂的制备及可见光催化降解染料

葛明, 谭勉勉, 崔广华   

  1. 河北联合大学化学工程学院, 河北 唐山 063009
  • 收稿日期:2014-06-23 修回日期:2014-09-04 发布日期:2014-10-30
  • 通讯作者: 葛明, 崔广华 E-mail:geminggena@163.com;tscghua@126.com
  • 基金资助:

    河北省自然科学基金(B2014209182)和河北省教育厅青年基金(QN2014045)资助项目

Synthesis of Ag3PO4/BiVO4 Composite Photocatalyst and Its Photocatalytic Degradation of Dyes under Visible Light Irradiation

GE Ming, TAN Mian-Mian, CUI Guang-Hua   

  1. College of Chemical Engineering, Hebei United University, Tangshan 063009, Hebei Province, P. R. China
  • Received:2014-06-23 Revised:2014-09-04 Published:2014-10-30
  • Contact: GE Ming, CUI Guang-Hua E-mail:geminggena@163.com;tscghua@126.com
  • Supported by:

    The project was supported by the Natural Science Foundation of Hebei Province, China (B2014209182) and Youth Foundation of Hebei Education Department, China (QN2014045).

摘要:

结合回流法和原位沉淀法成功制备磷酸银/矾酸铋(Ag3PO4/BiVO4)复合光催化剂. 通过X 射线衍射(XRD)、场发射扫描电子显微镜(FESEM)、能量色散X射线光谱(EDS)、紫外-可见漫反射光谱(UV-Vis DRS)及光致发光(PL)光谱对制备样品进行表征. XRD和FESEM结果表明成功制备Ag3PO4/BiVO4复合光催化剂. 采用节能发光二极管灯(LED)作为可见光光源, 在低消耗光催化系统中评价制备样品可见光催化降解染料的活性.当Ag3PO4和BiVO4的组成摩尔比为1:3 时, 复合Ag3PO4/BiVO4光催化剂呈现出高于纯相Ag3PO4的催化活性,可减少Ag3PO4的使用量. Ag3PO4/BiVO4复合光催化剂在中性溶液中表现出高活性, 同时证实其对阳离子染料的光催化降解效果强于阴离子染料. 在Ag3PO4/BiVO4系统中, 超氧自由基和空穴是主要的活性物种. 经过三次循环利用, Ag3PO4/BiVO4复合催化剂的可见光催化活性表现出不同程度的降低, 归因于降解过程中产生金属银.

关键词: 磷酸银, 矾酸铋, 可见光, 光催化, 染料, 机理

Abstract:

Silver phosphate/bismuth vanadate (Ag3PO4/BiVO4) composite photocatalysts were successfully synthesized by coupling a reflux method with an in situ precipitation route. X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), UV-Vis diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy were used to characterize the as-prepared products. The XRD and FESEM results showed that Ag3PO4/BiVO4 composite photocatalysts were successfully obtained. An energy-efficient light emitting diode lamp was used as the visible light source, and the photocatalytic performances of the as-synthesized products were evaluated for dye degradation in a low-cost photocatalytic system. The Ag3PO4/BiVO4 composite with a Ag3PO4:BiVO4 molar ratio of 1:3 exhibited much higher photocatalytic activity than pure Ag3PO4 catalyst, resulting in decreased use of Ag3PO4. The Ag3PO4/BiVO4 composite photocatalyst showed the best photoactivity in neutral solution and had a higher photodegradation rate for cationic dyes than anionic dyes. The superoxide radicals (O2) and holes (h+) were considered to be the main active species in the Ag3PO4/BiVO4 system. The photocatalytic activity of the Ag3PO4/BiVO4 composite photocatalyst decreased to different degrees after three cycles because of the production of metallic silver.

Key words: Silver phosphate, Bismuth vanadate, Visible light, Photocatalysis, Dye, Mechanism

MSC2000: 

  • O644