采用溶胶凝胶法制备了可见光响应型Fe掺杂SiO2/TiO2光催化材料,并采用TG-DTA、XRD、UV-vis、TEM及XPS等手段对其进行了表征.以水中腐殖酸的降解为探针反应,考察了可见光照射下Fe-SiO2/TiO2的光催化活性.XRD结果表明,Fe离子掺杂可抑制催化剂晶粒尺寸,600℃焙烧后的Fe-SiO2/TiO2为锐钛矿相结构.Ur-vis吸收光谱分析可看出Fe离子掺杂提高了催化剂对可见光的吸收能力,并使催化剂的吸收带边产生了红移.XPS光谱表明,催化剂表面存在着Fe2+和Fe3+.实验结果表明,Fe-SiO2/TiO2在可见光下对腐殖酸的光催化降解率优于SiO2/TiO2和TiO2.Fe-SiO2/TiO2具有较高光催化活性的主要原因为:Fe离子掺杂不仅使SiO2/TiO2催化剂的粒径减小和对可见光的吸收增强,而且在催化剂表面产生了有利于光生e--h+对分离的Fe3+/Fe2+氧化还原循环电对.
参考文献
| [1] | Yan XL;He J;Evans DG;Duan X;Zhu YX .Preparation, characterization and photocatalytic activity of Si-doped and rare earth-doped TiO2 from mesoporous precursors[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2005(4):243-252. |
| [2] | Rapid Photocatalytic Destruction Of Pentachlorophenol In F-si-comodified Tio_2 Suspensions Under Microwave Irradiation[J].Journal of hazardous materials,2009(2/3):1281-1287. |
| [3] | Yijie Zhang;Xianfeng Li;Dong Chen .Si doping effects on the photocatalytic activity of TiO_2 nanotubes film prepared by an anodization process[J].Scripta materialia,2009(7):543-546. |
| [4] | Ma N;Quan X;Zhang Y B et al.Integration of Separation and Photocatalysis Using an Inorganic Membrane Modified with Si-doped TiO2 for Water Puri Fication[J].Journal of Membrane Science,2009,335(1-2):58-67. |
| [5] | Qifeng Chen;Dong Jiang;Weimei Shi;Dong Wu;Yao Xu .Visible-light-activated Ce-Si co-doped TiO_2 photocatalyst[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2009(18):8048-8053. |
| [6] | Xu YH;Zeng ZX .The preparation, characterization, and photocatalytic activities of Ce-TiO2/SiO2[J].Journal of molecular catalysis, A. Chemical,2008(1):77-81. |
| [7] | Cui L F;Huang F;Niu M T et al.A Visible Light Active Photocatalyst:Nano-eomposite with Fe-doped Anatase TiO2 Nanoparticles Coupling with TiO2 (B) Nanobelts[J].Journal of Molecular Catalysis A:Chemical,2010,326(1-2):1-7. |
| [8] | Wantala K;Laokiat L;Khemthong P et al.Calcination Temperature Effect on Solvothermal Fe-TiO2 and Its Performance under Visible Light Irradiation[J].Journal of the Taiwan Institute of Chemical Engineers,2010,41(05):612-616. |
| [9] | Jiaguo Yu;Quanjun Xiang;Minghua Zhou .Preparation, characterization and visible-light-driven photocatalytic activity of Fe-doped titania nanorods and first-principles study for electronic structures[J].Applied Catalysis. B, Environmental,2009(3/4):595-602. |
| [10] | 侯兴刚,黄美东,吴晓玲,刘安东.3d过渡金属离子注入锐钛矿TiO2第一性原理研究[J].中国科学G辑,2009(05):736-740. |
| [11] | Wang LY;Sun YP;Xu BS .Comparison study on the size and phase control of nanocrystalline TiO2 in three Ti-Si oxide structures[J].Journal of Materials Science,2008(6):1979-1986. |
| [12] | 王韵芳;孙彦平 .两步溶胶-凝胶法制备钛硅复合氧化物及其光催化活性的研究[J].人工晶体学报,2010,39(S):54-58. |
| [13] | Kang M;Lee MH .Synthesis and characterization of Al-, Bi-, and Fe-incorporated mesoporous titanosilicate (MPTS) materials and their hydrophilic properties[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2005(1/2):215-222. |
| [14] | Serpone N;Lawless D;Khairutdinov R .Subnanosecond Relaxation Dynamics in TiO2 Colloidal Sols (Particle Sizes Rp ＝ 1 0-13 4nm) Relevance to Heterogeneous Photocatalysis[J].The Journal of Physical Chemistry C,1995,99(45):16655-16661. |
| [15] | Properties of carbon and iron modified TiO_2 photocatalyst synthesized at low temperature and photodegradation of acid orange 7 under visible light[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2010(13):p.4260. |
| [16] | Dong, F.;Wang, H.;Wu, Z.;Qiu, J. .Marked enhancement of photocatalytic activity and photochemical stability of N-doped TiO_2 nanocrystals by Fe~(3+)/Fe~(2+) surface modification[J].Journal of Colloid and Interface Science,2010(1):200-208. |
| [17] | Hirotaka Ozaki;Shinji Iwamoto;Masashi Inoue .Marked Promotive Effect of Iron on Visible-Light-Induced Photocatalytic Activities of Nitrogen-and Silicon-Codoped Titanias[J].The journal of physical chemistry, C. Nanomaterials and interfaces,2007(45):17061-17066. |
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