双金属纳米Ag/Cu负载TiO2的制备及光催化制氢活性  

Preparation and Photocatalytic Activity for Hydrogen Evolution of Bimetallic Nano Ag/Cu on TiO2 Composite Photocatalysts

作　　者：涂盛辉 徐翀 戴策 林立 彭海龙 杜军 TU Shenghui;XU Chong;DAI Ce;LIN Li;PENG Hailong;DU Jun(School of Resources Environment and Chemical Engineering,Nanchang University,Nanchang 330031;Key Laboratory of Poyang Lake Environment and Resource Utilization,Ministry of Education,Nanchang University,Nanchang 330047)

机构地区：[1]南昌大学资源环境与化工学院,南昌330031 [2]南昌大学鄱阳湖环境与资源利用教育部重点实验室,南昌330047

出　　处：《材料导报》2019年第16期2633-2637,共5页Materials Reports

基　　金：国家自然科学基金(31660482,51162022)~~

摘　　要：采用化学还原法,选用具有锐钛矿相和金红石相的TiO2(P25)作为主催化剂,制备双金属纳米Ag/Cu@P25复合催化剂。以甘油为牺牲试剂,研究了不同Ag/Cu负载量对产氢活性的影响。实验结果表明,相比单金属负载和纯TiO2(P25),经双金属纳米Ag/Cu负载后,光催化剂的催化产氢活性有了很大提高。其在可见光下产氢活性达6368.20μmol·g^-1·h^-1,在全光谱下的产氢活性为25811.51μmol·g^-1·h^-1,约为纯TiO2(P25)(2234.27μmol·g^-1·h^-1)的11.55倍,同时在可见光下具有良好的光催化稳定性。通过X射线衍射(XRD)仪、比表面积测量(BET)仪、场发射扫描电镜(SEM)、傅里叶变换红外光谱(FT-IR)仪、紫外-可见漫反射光谱(DRS)仪对复合催化剂进行表征,研究了其微观形貌、结构及光学特性,同时对双金属纳米Ag/Cu@P25复合催化剂的反应机理进行了探究。Bimetallic nano Ag/Cu@P25 composite catalysts were prepared by chemical reduction method using TiO 2(P25)with anatase phase and rutile phase as main catalyst.Glycerol was used as a sacrificial reagent to investigate the effects of different Ag/Cu loading on hydrogen production.The experimental results show that,compared with the single metal load and pure TiO 2(P25),the catalytic hydrogen production activity of the photocatalyst has been greatly increased after the bimetallic nano Ag/Cu loading,and the hydrogen production effect is 6 368.20μmol·g^-1·h^-1 under visible light,and the hydrogen production activity under total light spectrum is 25 811.51μmol·g^-1·h^-1,which is 11.55 times of pure TiO 2(P25)(2 234.27μmol·g^-1·h^-1).It has good photocatalytic stability under the visible light.The micromorphology,structure and optical properties of the composite catalyst were investigated by X-ray diffractometer(XRD),specific surface area measuring instrument(BET)and field emission scanning electron microscope(SEM),Fourier transform infrared spectrometer(FT-IR),ultraviolet-visible diffuse reflectance spectroscopy(DRS),and the possible reaction mechanism of the bimetallic nano Ag/Cu@P25 composite catalyst was explored.

关 键 词：化学还原法 Ag/Cu@P25 产氢活性 光催化 

分 类 号：O643[理学—物理化学]