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.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
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)~~
