AgI/Ag3PO4 heterojunction composites with enhanced photocatalytic activity under visible light irradiation
AgI/Ag3PO4 heterojunction composites with enhanced photocatalytic activity under visible light irradiation
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AgI/Ag3PO4异质结复合材料在可见光照射下具有增强的光催化活性
DOI：
10.1016/j.apsusc.2013.09.113
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发表时间：
2013-12
影响因子：
6.7
通讯作者：
Jia Yan, Cheng Wang, Hui Xu, Huaming Li*
中科院分区：
文献类型：
--
作者：
Jia Yan, Cheng Wang, Hui Xu, Huaming Li*
采用离子交换法合成了AgI/Ag 3 PO 4杂化材料。采用X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）、能谱（EDS）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FT-IR）、紫外-可见漫反射光谱（DRS）和光致发光（PL）等手段对样品的结构和形貌进行了表征。结果表明，AgI纳米粒子在Ag 3 PO 4表面均匀分布，形成异质结构。AgI/Ag 3 PO 4复合材料的漫反射光谱在紫外和可见光区都有很强的吸收。PL分析表明，AgI/Ag 3 PO 4纳米复合材料中电子空穴对的分离更加有效。在可见光（λ> 400 nm）下，AgI/Ag 3 PO 4复合材料对罗丹明B的光催化降解活性明显高于纯Ag 3 PO 4晶体。AgI/Ag 3 PO 4光催化活性的提高归因于AgI和Ag 3 PO 4之间的带势匹配所产生的电子-空穴对的有效分离。提出了AgI/Ag 3 PO 4杂化材料的光催化机理和光催化反应动力学。
AgI/Ag3PO4hybrids were synthesized via an ion-exchange method. The structures and morphologies of the samples were characterized by using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), UV–vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL). The results showed that AgI nanoparticles were uniformly distributed on the surface of Ag3PO4and the heterostructure was formed. DRS of the AgI/Ag3PO4composites exhibited strong absorbance in Ultraviolet (UV) and visible regions. PL analysis indicated a more efficient separation of electron–hole pairs in the AgI/Ag3PO4nanocomposites. Under visible light (λ> 400 nm), the photocatalytic activity of the AgI/Ag3PO4composites for photodegradation of rhodamine B were efficient and much higher than that of the pure Ag3PO4crystals. The enhancing photocatalytic activity of AgI/Ag3PO4was attributed to the efficient separation of electron–hole pairs derived from the matching band potentials between AgI and Ag3PO4. A photocatalytic mechanism and the photocatalytic reaction kinetics over AgI/Ag3PO4hybrid materials were also proposed.
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