物理化学学报 >> 2014, Vol. 30 >> Issue (10): 1909-1915.doi: 10.3866/PKU.WHXB201408046

催化和表面科学 上一篇    下一篇

可见光响应的Co3(PO4)2/Ag3PO4纳米复合光催化剂的制备及表征

顾永琴, 王波, 顾修全, 赵宇龙, 强颖怀, 张双, 朱磊   

  1. 中国矿业大学材料科学与工程学院, 江苏徐州 221116
  • 收稿日期:2014-06-05 修回日期:2014-08-03 发布日期:2014-09-30
  • 通讯作者: 强颖怀 E-mail:yhqiang@cumt.edu.cn
  • 基金资助:

    江苏省自然科学基金青年项目(BK20130198)和中央高校基本科研基金(2013XK07)资助

Preparation and Characterization of Co3(PO4)2/Ag3PO4 Nanocomposites for Visible-Light Photocatalysis

GU Yong-Qin, WANG Bo, GU Xiu-Quan, ZHAO Yu-Long, QIANG Ying-Huai, ZHANG Shuang, ZHU Lei   

  1. School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, P. R. China
  • Received:2014-06-05 Revised:2014-08-03 Published:2014-09-30
  • Contact: QIANG Ying-Huai E-mail:yhqiang@cumt.edu.cn
  • Supported by:

    The project was supported by the Natural Science Youth Foundation of Jiangsu Province, China (BK20130198) and Fundamental Research Funds for the Central Universities, China (2013XK07).

摘要:

采用简单的化学偏聚法合成出Ag3PO4纳米颗粒、磷酸钴(Co3(PO42,CoP)纳米片以及它们两者的纳米复合结构(CoP/Ag3PO4),同时还比较了它们的可见光催化活性. 采用场发射扫描电镜(FESEM)、X 射线衍射(XRD)、紫外-可见(UV-Vis)吸收光谱以及光致发光谱等手段对其形貌、结构、光学以及可见光催化性能等进行表征. 结果表明,CoP/Ag3PO4复合纳米结构的可见光降解甲基橙(MO)的速率和循环稳定性均明显优于其它两种物质. 这表明CoP应该起着共催化剂的作用,它能够抑制光生电子与空穴之间的复合,并且提供大量高活性的光生空穴. 此外,我们还发现CoP/Ag3PO4降解另一种阳离子型染料——罗丹明B(RhB)的能力则远不如纯Ag3PO4,这可能是与光催化剂的表面性质发生改变有关,造成更低的RhB吸附能力. 本文提供了一种廉价制备高效可见光催化剂的新方法.

关键词: Ag3PO4, Co3(PO4)2, 可见光催化, 甲基橙, 罗丹明B

Abstract:

In this study, Ag3PO4 nanoparticles (NPs), cobalt phosphate (Co3(PO4)2, CoP) nanosheets (NSs), and their composites (CoP/Ag3PO4) were synthesized via a facile chemical precipitation method. Their visiblelight photocatalytic activities were compared and investigated. The structural, morphological, optical, and visiblelight photocatalytic properties of the prepared samples were characterized by X-ray diffraction (XRD), fieldemission scanning electron microscopy (FESEM), ultraviolet- visible (UV- Vis) diffuse absorbance and photoluminescence (PL) spectroscopies. We found that both the degradation rate and cyclical stability of the CoP/Ag3PO4 hybrids increased significantly under visible-light irradiation when methyl orange (MO) was used as the target with reference to single-phase Ag3PO4 NPs or CoP NSs. This suggests that CoP might play a cocatalyst role, which suppresses carrier recombination and provides a large number of photogenerated holes. Additionally, we also observed that the CoP/Ag3PO4 hybrids hardly degraded Rhodamine B (RhB), a cationic dye. This behavior might be attributed to the lower amount of dye molecule absorption because of a change in surface polarity. We thus present a new approach for the development of low-cost and visible-light responsive photocatalysts.

Key words: Ag3PO4, Co3(PO4)2, Visible-light photocatalysis, Methyl orange, Rhodamine B

MSC2000: 

  • O649