Ag3PO4/Ni薄膜的制备及其光催化降解罗丹明B的性能和机理
Preparation of Ag3PO4/Ni Thin Films and Their Photocatalytic Activity and Reaction Mechanism for Rhodamine B
作者单位E-mail
李爱昌 廊坊师范学院化学与材料科学学院, 廊坊 065000 aichangli@hotmail.com 
朱柠柠 廊坊师范学院化学与材料科学学院, 廊坊 065000  
李京红 廊坊师范学院化学与材料科学学院, 廊坊 065000  
杨晓艳 廊坊师范学院化学与材料科学学院, 廊坊 065000  
王爽 廊坊师范学院化学与材料科学学院, 廊坊 065000  
杨柳 廊坊师范学院化学与材料科学学院, 廊坊 065000  
摘要: 用电化学方法制备Ag3PO4/Ni薄膜,以扫描电子显微镜(SEM)、X射线衍射(XRD)和紫外-可见漫反射光谱(UV-Vis DRS)对薄膜的表面形貌、晶相结构、光谱特性及能带结构进行了表征,以罗丹明B为模拟污染物对薄膜的光催化活性和稳定性进行了测定,采用向溶液中加入活性物种捕获剂的方法对薄膜光催化降解机理进行了探索。结果表明:最佳工艺下制备的Ag3PO4/Ni薄膜具有致密的层状表面结构,是由多晶纳米颗粒构成的薄膜。薄膜具有较高的光催化活性和突出的光催化稳定性,可见光下催化作用60 min,薄膜光催化罗丹明B的降解率是多孔P25 TiO2/ITO纳米薄膜(自制)的2.3倍;在保持薄膜光催化活性基本不变的前提下可循环使用6次。给出了可见光下薄膜光催化降解罗丹明B的反应机理。
关键词: Ag3PO4/Ni薄膜  电化学制备  光催化  罗丹明B  反应机理
基金项目: 河北省科技支撑计划项目(No.11276732)和廊坊师范学院重点科学研究项目(No.LSZZ201303)资助。
Abstract: Ag3PO4/Ni thin films were prepared by electrochemical method. The surface morphology, phase structure, optical characteristics and band structure of the thin film were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), respectively. Its photocatalytic properties and stability were evaluated with Rhodamine B (RhB) as a model compound. Using a method of adding active species scavenger to the solution, mechanism of photocatalytic degradation of the film was explored. The results show that the Ag3PO4/Ni thin film prepared under optimum condition has a compact layer structure composed by polymouphous nanoparticles. The thin film exhibits high photocatalytic activity and excellent photocatalytic stability to decompose Rhodamine B. The photodegradation rate is about 2.3 times that of porous P25 TiO2/ITO nanofilm under the visible light in 60 min. The film maintains nearly 100% of their corresponding initial photocatalytic activity after 6 cycles. Furthermore, the photodegradation mechanism of the film for Rhodamine B under the visible light was proposed.
Keywords: Ag3PO4/Ni thin film  electrochemical preparation  photocatalysis  rhodamine B  reaction mechanism
投稿时间:2014-09-18 修订日期:2014-12-29
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李爱昌,朱柠柠,李京红,杨晓艳,王爽,杨柳.Ag3PO4/Ni薄膜的制备及其光催化降解罗丹明B的性能和机理[J].无机化学学报,2015,31(4):681-688.
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