以葡萄糖和蔗糖为电子给体在Pt/TiO_2上光催化制氢  

Photocatalytic Hydrogen Generation Using Glucose and Sucrose as Electron Donors over Pt/TiO_2

作　　者：李越湘[1] 谢艳招[1] 彭绍琴[1] 吕功煊[2] 李树本[2] 

机构地区：[1]南昌大学化学系,南昌330047 [2]中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室,兰州730000

出　　处：《高等学校化学学报》2007年第1期156-158,共3页Chemical Journal of Chinese Universities

基　　金：国家'九七三'计划项目(批准号:2003CB214503)资助

摘　　要：Using glucose and sucrose as the electron donors,the photocatalytic hydrogen evolution over Pt/TiO2 was investigated.Glucose and sucrose enhance notably the activity for hydrogen generation.The amounts of produced H2 increase almost proportionally to time within 5 h irradiation in the reaction systems of the two electron donors.The effect of the initial concentration of glucose and sucrose on the reaction rate is consistent with the Langmuir-Hinshelwood kinetic model.After 5 h irradiation,the COD（chemical oxygen demand） in the reaction system of glucose and in that of sucrose decrease by 33.2%,11.4% respectively.The effect of electron donors on the flat-band potential of conduction band of TiO2 electrode was investigated.The flat-band potential of conduction band of TiO2 electrode in the presence of the electron donors shifts negatively,and the shift in the presence of glucose is larger than that in the presence of sucrose due to glucose having a larger adsorption amount on TiO2.Using glucose and sucrose as the electron donors, the photocatalytic hydrogen evolution over Pt/ TiO2 was investigated. Glucose and sucrose enhance notably the activity for of produced H2 increase almost proportionally to time within 5 h irradiation in the reaction systems of the two electron donors. The effect of the initial concentration of glucose and sucrose on the reaction rate is consistent with the Langmuir-Hinshelwood kinetic model. After 5 h irradiation, the COD（ chemical oxygen demand） in the reaction system of glucose and in that of sucrose decrease by 33.2%, 11.4% respectively. The effect of electron donors on the flat-band potential of conduction band of TiO2 electrode was investigated. The flat-band potential of conduction band of TiO2 electrode in the presence of the electron donors shifts negatively, and the shift in the presence of glucose is larger than that in the presence of sucrose due to glucose having a larger adsorption amount on TiO2.

关 键 词：光催化 氢生成 葡萄糖 蔗糖 PT/TIO2 

分 类 号：O641[理学—物理化学]