催化学报 ›› 2014, Vol. 35 ›› Issue (8): 1410-1417.DOI: 10.1016/S1872-2067(14)60079-6

• 自由来稿(论文) • 上一篇    下一篇

可见光驱动Ag3PO4催化降解罗丹明B和甲基橙

葛明   

  1. 河北联合大学化学工程学院, 河北唐山 063009
  • 收稿日期:2014-01-09 修回日期:2014-03-18 出版日期:2014-08-01 发布日期:2014-08-05
  • 通讯作者: 葛明
  • 基金资助:

    河北联合大学博士启动基金(35398599);河北省自然科学基金(B2014209182).

Photodegradation of rhodamine B and methyl orange by Ag3PO4 catalyst under visible light irradiation

Ming Ge   

  1. College of Chemical Engineering, Hebei United University, Tangshan 063009, Hebei, China
  • Received:2014-01-09 Revised:2014-03-18 Online:2014-08-01 Published:2014-08-05
  • Supported by:

    This work was supported by the Starting Research Fund from Hebei United University (35398599) and the Natural Science Foundation of Hebei Province (B2014209182).

摘要:

采用简易离子交换法制备可见光驱动Ag3PO4光催化剂. 通过X射线衍射、场发射扫描电子显微镜、N2吸附-脱附、紫外-可见漫反射光谱及傅里叶变换红外光谱对所制备的Ag3PO4催化剂进行表征. 结果表明,在可见光照射下,Ag3PO4催化剂对罗丹明B降解表现出优越的光催化活性,但对甲基橙的降解活性低,这归因于Ag3PO4催化剂对甲基橙分子吸附量低. 可见光照Ag3PO4反应体系中,空穴和超氧自由基共同发挥作用导致罗丹明B和甲基橙光催化降解. 在罗丹明B的协助作用下,Ag3PO4催化剂对甲基橙的可见光催化降解活性大大增强,这是由于罗丹明B的存在可产生更多的超氧自由基,从而使甲基橙进一步降解.

关键词: 可见光, 磷酸银, 罗丹明B, 甲基橙, 机理

Abstract:

A visible-light-driven Ag3PO4 catalyst was successfully synthesized by a facile ion-exchange route. The as-synthesized Ag3PO4 was characterized by X-Ray diffraction (XRD), field-emission scanning electron microscopy, N2 adsorption-desorption, UV-Vis diffuse reflectance spectroscopy and Fourier transform infrared spectroscopy. Under visible light irradiation, the Ag3PO4 catalyst showed excellent photocatalytic activity for rhodamine (RhB) degradation, but was poor at degrading methyl orange (MO) because of lower adsorption of MO molecules onto the surface of the Ag3PO4. The photodegradation of RhB and MO was achieved by holes and O2·- radical attack in the Ag3PO4 suspension. The photodegradation of MO over the Ag3PO4 catalyst was greatly enhanced in the presence of RhB owing to greater production of O2·- radicals.

Key words: Visible light, Silver phosphate, Rhodamine B, Methyl orange, Mechanism