可见光响应的Co_3(PO_4)_2/Ag_3PO_4纳米复合光催化剂的制备及表征(英文)  

Preparation and Characterization of Co_3(PO_4)_2/Ag_3PO_4 Nanocomposites for Visible-Light Photocatalysis

作　　者：顾永琴[1] 王波[1] 顾修全[1] 赵宇龙[1] 强颖怀[1] 张双[1] 朱磊[1] 

机构地区：[1]中国矿业大学材料科学与工程学院,江苏徐州221116

出　　处：《物理化学学报》2014年第10期1909-1915,共7页Acta Physico-Chimica Sinica

基　　金：supported by the Natural Science Youth Foundation of Jiangsu Province,China(BK20130198);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(PO4)2,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.In this study, Ag3PO, nanoparticles （NPs）, cobalt phosphate （Co3（PO4）2, CoP） nanosheets （NSs）, and their composites （CoP/Ag3PO4） were synthesized via a facile chemical precipitation method. Their visible- light photocatalytic activities were compared and investigated. The structural, morphological, optical, and visible- light photocatalytic properties of the prepared samples were characterized by X-ray diffraction （XRD）, field- emission 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/Ag3PO, hybrids increased significantly under visible-light irradiation when methyl orange （MO） was used as the target with reference to single-phase Ag3PO, 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.

关 键 词：Ag3PO4 Co3(PO4)2 可见光催化 甲基橙 罗丹明B 

分 类 号：O643.36[理学—物理化学] TB383.1[理学—化学]