可见光下Fe^(3+)掺杂对K_2La_2Ti_3O_(10)分解水制氢性能的影响  

Effect of Fe^(3+) Doping on Photocatalytic Activity of K_2La_2Ti_3O_(10) for Water Decomposition to Hydrogen under Visible Light

作　　者：陈威[1] 董新法[1] 陈之善[1] 陈胜洲[2] 林维明[1,2] 

机构地区：[1]华南理工大学化学与化工学院,广东省绿色化学产品技术重点实验室,广州510640 [2]广州大学化学化工学院,广州510006

出　　处：《物理化学学报》2009年第6期1107-1110,共4页Acta Physico-Chimica Sinica

基　　金：广东省绿色化学产品技术重点实验室开放基金(GC200802)资助

摘　　要：采用溶胶-凝胶法制备了Fe3+掺杂的Fe-K2La2Ti3O10光催化剂,并通过X射线衍射(XRD)、紫外-可见漫反射(DRS)、X射线光电子能谱(XPS)等技术对其进行了表征和分析,考察了不同掺杂量对K2La2Ti3O10的性质及光催化分解水制氢活性的影响.结果表明,Fe-K2La2Ti3O10在400-650nm范围内显示强吸收,光谱响应扩展到可见光区(λ>400nm),掺杂Fe3+后,K2La2Ti3O10的可见光区的光催化制氢活性显著提高,掺杂量为nFe/nTi=0.04时活性最佳,当催化剂用量为0.1g,反应液为CH3OH(30mL)+H2O(90mL)时,产氢量达到1.92μmol·h-1,为未掺杂时的4倍.Undoped K2La2Ti3O10 and Fe3＋ doped K2La2Ti3O10 samples were prepared by the sol-gel method and characterized by X-ray diffraction （XRD）, UV-Vis diffuse reflectance spectra （DRS） and X-ray photoelectron spectroscopy （XPS）. The effects of Fe3＋ doping quantity on the properties and photocatalytic activity for hydrogen evolution were investigated. Results showed that Fe-doped K2La2Ti3O10 showed stronger absorption in the 400--650 nm range and this expanded to the visible light （λ〉400 nm）. Doping with Fe3＋ raised the photocatalytic activity for hydrogen generation and the optimum amount of Fe3＋ doping was found to be nFn=0.04. At this ratio and under visible light the rate of hydrogen evolution ofK2La2Ti3O10 was 1.92 μmol·h-1 and this was 4 times higher than that of undoped K2La2Ti3O10 when 120 mL of reactive liquid （CH3OH（30 mL）＋H20（90 mL）） containing 0.1 g photocatalyst was used.

关 键 词：光催化 Fe^(3+)掺杂 K2La2Ti3O(10) 可见光 水分解 氢气 

分 类 号：O643.36[理学—物理化学]