采用溶胶-凝胶法制备了TiO2和Bi掺杂的TiO2纳米颗粒,用N2吸附-脱附、SEM、XRD、FT-Raman、UV-Vis DRS对光催化材料的孔结构、表面构造、能带结构、吸光特性进行了表征,并考查了其光催化甘油水溶液制氢反应的活性.结果表明:Bi掺杂后的TiO2为介孔结构的锐钛矿晶型纳米颗粒,其分散度明显增加,晶粒变小,比表面积增大；Bi掺杂使得TiO2禁带内形成杂质能级,降低了禁带能量,增加了光生电子和空穴的分离效率,有利于将TiO2的吸光带边界扩展至可见光区；Bi掺杂的TiO2样品表现出了远高于纯TiO2的光催化甘油水溶液制氢性能,2mol％Bi掺杂的样品在紫外光和模拟太阳光辐射下表现出了最高产氢活性,其速率分别为3534.8 μmol/(h.gcat)和455.7 μmol/(h.gcat).
参考文献
| [1] | Ohtani B,Iwai K,Nishimoto S,et al.Role of platinum deposits on titanium(IV)oxide particle:structural and kinetic analyses of photocatalytic reaction in aqueous alcohol and amino acid solutions.J.Phys.Chem.B,1997,101(17):3349-3359. |
| [2] | Klosek S,Raftery D.Visible light driven V-doped TiO2 photocatalyst and its photooxidation of ethanol.J.Phys.Chem.B,2001,105(14):2815-2819. |
| [3] | Wu J C,Chen C H.A visible light response vanadium doped titania nanocatalyst by Sol-Gel method.J.Photochem.Photobiol.,A,2004,163(3):509-515. |
| [4] | Biswas S K,Pathak A,Pramanik N K,et al.Codoped Cr and W rutile nanosized powders obtained by pyrolysis of triethanolamine complexes.Ceram.Int.,2008,34(8):1875-1883. |
| [5] | Pan C C,Wu J C.Visible-light response Cr-doped TiO2-xNxphotocatalysts.Mater.Chem.Phys.,2006,100(1):102-107. |
| [6] | Nahar S,Hasegawa K,Kagaya S.Photocatalytic degradation of phenol by visible light-responsive iron-doped TiO2 and spontaneous sedimentation of the TiO2 particles.Chemosphere,2006,65(11):1976-1982. |
| [7] | Zhang X W,Lei L C.One step preparation of visible-light responsive Fe-TiO2 coating photocatalysts by MOCVD.Mater.Lett.,2008,62(6-7):895-897. |
| [8] | Kim D H,Lee K S,Kim Y S,et al.Photocatalytic activity of Ni 8wt％-doped TiO2 photocatalyst synthesized by mechanical alloying under visible light.J.Am.Ceram.Soc.,2006,89(2):515-518. |
| [9] | Niishiro R,Kato H,Kudo A.Nickel and either tantalum or niobium codoped TiO2 and SrTiO3 photocatalysts with visible-tight response for H2 or O2 evolution from aqueous solutions.Phys.Chem.Chem.Phys.,2005,7(10):2241-2245. |
| [10] | Bin L X,Hua L X.Microwave heating preparation of Ag-modified TiO2 for photocatalytic degradation of gaseous toluene.J.Inorg.Mater.,2010,25(4):365-369. |
| [11] | Wan B,Chen M B,Zhou X Y,et al.Photoclectrocatalytic performance of Ag/TiO2-xNx nanotube.J.Inorg.Mater.,2010,25(3):285-288. |
| [12] | Xu J J,Chen M D,Fu D G.Study on highly visible light active Bi-doped TiO2 composite hollow sphere.Appl.Sur.Sci.,2011,257(17):7381-7386. |
| [13] | Sang H X,Wang X T,Fan C C,etal.Enhanced photocatalytic H2 production from glycerol solution over ZnO/ZnS core/shell nanorods prepared by a low temperature route.Int.J.Hydrogen Energy,2012,37(2):1348-1355. |
| [14] | Sajjad S,Sajjad A K,Chen F,et al.Bismuth-doped ordered mesoporous TiO2:visible-light catalyst for simultaneous degradation of phenol and chromium.Chem.Eur.J.,2010,16(46):13795-13804. |
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