糠醛、糠醇和糠酸为电子给体在Pt/TiO2上光催化制氢  

Photocatalytic Hydrogen Generation Using Furfural,Furfuryl Alcohol and Furoic Acid as Electron Donors over Pt/TiO_2

作　　者：彭绍琴[1] 彭煜靖[1] 李越湘[1] 黎澄宇 

机构地区：[1]南昌大学化学系,江西南昌330031 [2]江西省辐射环境监测站,江西南昌330029

出　　处：《精细化工》2008年第12期1212-1215,1224,共5页Fine Chemicals

基　　金：国家自然科学基金资助(20763006);江西省自然科学基金资助(2007GZH1754);江西省教育厅基金资助(赣教技字[2007]54号)~~

摘　　要：糠醛、糠醇和糠酸在TiO2表面吸附符合Langmuir吸附模型,吸附常数分别为9.43×102、3.88×102和1.48×103L/mol。与纯水体系相比,4.00×10-3mol/L糠醛、糠醇和糠酸作电子给体时,10h光照Pt/TiO2光解水制氢效率分别提高了33.8、260和444。光照5h,糠醛、糠醇和糠酸分别降解了10.0,16.3和48.5,COD(化学需氧量)平均去除率分别为10.0、18.0和28.4mg/L.h。溶液pH对放氢有影响,糠醛和糠酸弱酸性条件下放氢效果好,而糠醇弱碱性条件下放氢效果好。通过对降解产物分析,探讨了污染物降解的可能反应机理。The adsorption of pollutants furfural, furfuryl alcohol and furoic acid on TiO2 is consistent with a Langmuir-Hinshelwood kinetic model, with adsorption constants 9.43×10^2, 3.88×10^2 and 1.48× 10^3 L/mol,respectively. In 4.00 ×10^-3 mol/L furfural, furfuryl alcohol and furoic acid solution,the efficiency of hydrogen evolution catalyzed by Pt/TiO2 was enhanced respectively by 33.8% ,260% and 444% after 10 h irradiation, compared to that in pure water. The pollutants decreased by 10. 0% , 16.3% and 48.5% and the COD（chemical oxygen demand） by 10. 0,18.0 and 28.4 mg/L · h in the reaction system of furfural, furfuryl alcohol and furoic acid after 5 h irradiation, respectively. The initial- pH effect on hydrogen evolution rate was investigated Under weakly alkaline condition, the rate of the hydrogen generation reached maximum in the reaction systems of furfural and furoic acid, whereas under weakly acidic condition, the rate reached maximum in that of furfuryl alcohol. A possible reaction mechanism was discussed according to the intermediate products of degradation.

关 键 词：制氢 PT/TIO2 糠醛 糠醇 糠酸 电子给体 催化与分离提纯技术 

分 类 号：O643.32[理学—物理化学]