摘要
为实现光催化制氢,通过模板剂水热合成和浸渍还原法制备出Ag负载ZnS光催化剂.利用XRD、SEM和UV-vis对样品进行结构和光学性质表征,利用光催化分解Na2S+Na2SO3溶液制氢评价光催化性能.结果表明:在酸性条件下,模板剂质量浓度较低而硫源和锌源较多时,样品为棒状,主要以立方闪锌矿结构存在;反之,样品主要为球状,以纤维锌矿结构和闪锌矿结构共存.碱性条件下,样品成球状,以立方闪锌矿结构存在.EDS分析表明,少量的Ag负载到ZnS样品表面.实验中制备的样品A为混晶结构,其对应的吸收光谱红移最大,同时负载Ag有利于光生电子和空穴的分离,表现出最佳的光催化制氢性能.
To fulfill photocatalytic hydrogen production,Ag-doped ZnS photo catalyst was prepared by template hydrothermal method and solution infiltration and reduction method.The structure and optical property were studied by XRD,SEM and UV-vis,respectively.The photocatalytic activity of the catalysts was evaluated by splitting Na2S＋Na2SO3 solution into H2.The results show that in acid bath with a small amount of template and a large amount of Thiourea and Zn（Ac）2,the sample is of rod structure and exists mainly in the form of sphalerite;whereas the sample is of ball structure and co-exists in the form of wurtzite and sphalerite.In a base bath,ZnS is of rod structure and exists mainly in the form of sphalerite.EDS analysis indicates that a small amount of Ag is loaded on the ZnS.The sample A has mixed-crystallized structure with bigger red-shifted in UV-vis absorption spectrum,and the doped Ag is liable to separate the photo-induced e-and h＋,which presents the best photocatalytic activity for H2 production.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2011年第12期100-103,共4页
Journal of Harbin Institute of Technology
基金
国家高技术研究发展计划项目(2007AA03Z337)
哈尔滨工业大学大学生国家级科技创新项目(2009)
