采用溶胶-凝胶法制备出Si4+离子掺杂的TiO2可见光催化剂(TiO2-xSi),该催化剂的可见光催化活性高于纯TiO2和N掺杂的TiO2(TiO2-N).利用XRD、XPS、FT-IR和UV-Vis DRS等表征技术,研究了TiO2-xSi催化剂的晶体结构、能带结构和表面性质.研究发现:掺入Si4+离子在TiO2粒子表面主要形成Ti-O-Si结构,并在导带下0.2-0.6 eV区域形成表面态能级,该表面态能级的存在是催化剂产生可见光响应、实现可见光催化的根本原因.另外,讨论了Si4+离子的掺杂对金红石相和晶粒的生长抑制作用,以及催化剂的比表面积和表面羟基物种增加对可见光催化活性的影响.
参考文献
| [1] | Fujishima A;Honda K .Electrochemical photolysis of water at a semiconductor electrode[J].Nature,1972,238:37. |
| [2] | Thompson T L;Yates Jr J T .Surface science studies of the photoactivation of TiO2-new photochemical process[J].Chemical Reviews,2006,106:4428. |
| [3] | Xiaobo Chen;Samuel S. Mao .Titanium Dioxide Nanomaterials: Synthesis, Properties, Modifications, and Applications[J].Chemical Reviews,2007(7):2891-2959. |
| [4] | Cao Y;Yang W;Zhang W et al.Improved photocatalytic activity of Sn4+ doped TiO2 nanoparticulate films prepared by plasma-enhanced chemical vapor deposition[J].New Journal of Chemistry,2004,28:218. |
| [5] | Zhu J;Ren J;Huo Y et al.Nanocrystalline Fe/TiO2 visible photocatalyst with a mesoporous structure prepared via a nonhydrolytic sol-gel toute[J].The Journal of Physical Chemistry C,2007,111:18965. |
| [6] | 王恩君,杨辉云,曹亚安.Zr离子掺杂TiO_2可见光催化剂光催化活性的研究[J].化学学报,2009(24):2759-2764. |
| [7] | Yang Y;Wang H;Li X et al.Electrospun mesoporous W6+-doped TiO2 thin film for efficient visible-light photocatalysis[J].Materials Letters,2009,63:331-333. |
| [8] | Nagaveni K;Hegde M S;Madras G S .Stucture and photocatalytic activity of Ti1-xMxO2±δ(M=W,V,Ce,Zr,Fe,and Cu) synthesized by solution combustion method[J].The Journal of Physical Chemistry(B)Materials Surfaces Interfaces & Physical,2004,108:20204-20212. |
| [9] | Asahi R;Morikawa T;Ohwaki T et al.Visible-light photocatalysis in nitrogen-doped titanium oxides[J].Science,2001,293:269-271. |
| [10] | Chen D;Jiang Z;Geng J et al.Carbon and nitrogen co-doped TiO2 enhance visible-light photocatalytic activity[J].Industrial and Engineering Chemistry Research,2007,46:2741. |
| [11] | 黄冬根,廖世军,党志.氟掺杂锐钛矿型TiO2溶胶的制备、表征及催化性能[J].化学学报,2006(17):1805-1811. |
| [12] | 龙绘锦,孟庆巨,元晶,杨文胜,曹亚安.B离子掺杂TiO2催化剂（TiO2-xBx）光催化活性的研究[J].化学学报,2008(06):657-661. |
| [13] | Anderson C;Bard A J .An improved photocatalyst of TiO2/SiO2 prepared by a sol-gel synthesis[J].Journal of Physical Chemistry,1995,99:9882. |
| [14] | Anderson C;Bard A J .Improved photocatalytic activity and characerization of mixed TiO2/SiO2 and TiO2/Al2O3 materials[J].The Jounal of Physical Chemistry B,1997,101:2611-2616. |
| [15] | Reddy B M;Mehdi S;Reddy E P .Dispersion and thermal stability of vanadium oxide catalysts supported on titania mixed oxide[J].Catalysis Letters,1993,20:317. |
| [16] | XIANZHI FU;LOUIS A. CLARK;QING YANG;MARC A. ANDERSON .Enhanced Photocatalytic Performance of Titania-Based Binary Metal Oxides: TiO_2/SiO_2 and TiO_2/ZrO_2[J].Environmental Science & Technology: ES&T,1996(2):647-653. |
| [17] | Iwamoto, S;Iwamoto, S;Inoue, M;Yoshida, H;Tanaka, T;Kagawa, K .XANES and XPS study of silica-modified titanias prepared by the glycothermal method[J].Chemistry of Materials,2005(3):650-655. |
| [18] | Li J;Hou B;Xu Y et al.Hydrothernal synthesis,characterization,and photocatalytic performance of silicamodified titanium dioxide nanoparticles[J].Journal of Colloid and Interface Science,2005,288:149-154. |
| [19] | Zhang HZ.;Banfield JF. .Thermodynamic analysis of phase stability of nanocrystalline titania[J].Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology,1998(9):2073-2076. |
| [20] | Kumar S R;Suresh C;Vasudevan K A et al.Phase transformation in sol-gel titania containing silica[J].Materials Letters,1999,38:161-166. |
| [21] | Pabon E;Retuert J;Quijada R et al.TiO2-SiO2 mixed oxides prepared by a combined sol-gel and polymer inclusion method[J].Microporous Materials,2004,67:195-203. |
| [22] | Yu J G;Yu H G;Cheng B et al.The effect of calcination temperature on the surface microstucture and photocatalytic activity of TiO2 thin film prepared by liquid phase deposition[J].The Journal of Physical Chemistry(B)Materials Surfaces Interfaces & Physical,2003,107:13871. |
| [23] | Hong X;Wang Z;Cai W et al.Visible-light-activated nanoparticle photocatalyst of lodine-doped Titanium dioxide[J].Chemistry of Materials,2005,17:1548-1552. |
| [24] | Duran A;Serna C;Fomes V et al.Structural considerations about SiO2 glasses prepared by sol-gel[J].Journal of Non-Crystalline Solids,1986,82:69-77. |
| [25] | Belhekar A;Awate S;Anand R .Photocatalytic activity of titania modified mesoporous silica for pollution control[J].Catalysis Communications,2002,3:453-458. |
| [26] | Hiromi Yamashita;Shinichi Kawasaki;Yuichi Ichihashi .Characterization of Titanium-Silicon Binary Oxide Catalysts Prepared by the Sol-Gel Method and Their Photocatalytic Reactivity for the Liquid-Phase Oxidation of 1-Octanol[J].The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical,1998(29/32):5870-5875. |
| [27] | Yang, Chung-Sung;Kauzlarich, Susan M.;Lee, Howard W.H.;Delgado, Gildardo R.;Bley, Richard A. .Synthesis of alkyl-terminated silicon nanoclusters by a solution route[J].Journal of the American Chemical Society,1999(22):5191-5195. |
| [28] | Cao Y;Meng QJ;Yang WS;Yao JH;Shu YC;Wang W;Chen GH .Effect of plasma treatment on surface properties of TiO2 nanoparticulate films[J].Colloids and Surfaces, A. Physicochemical and Engineering Aspects,2005(1/3):181-186. |
| [29] | Chen Q;Jiang D;Shi W et al.Visible-light-activated Ce-Si co-doped TiO2 photocatalyst[J].Applied Surface Science,2009,255:7918-7924. |
| [30] | Praveen K. Surolia;Rajesh J. Tayade;Raksh V. Jasra .Photocatalytic Degradation of Nitrobenzene in an Aqueous System by Transition-Metal-Exchanged ETS-10 Zeolites[J].Industrial & Engineering Chemistry Research,2010(8):3961-3966. |
| [31] | Wang E;He T;Zhao L;Chen Y Cao Y .Improved visible light photocatalytic activity of titania doped with tin and nitrogen[J].Jounal of Materials Chemictry,2010,21:144-150. |
| [32] | Enjun Wang;Peng Zhang;Yongmei Chen .Improved visible-light photocatalytic activity of titania activated by nitrogen and indium modification[J].Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology,2012(29):14443-14449. |
| [33] | Rehm J;McLendon G;Nagasawa Y;Yoshihara K Moser J and Gr tzel .Femtosecond electron-transfer dynamics at a sensitizing dye-semiconductor (TiO2) interface[J].Journal of Physical Chemistry,1996,100:9577-9578. |
| [34] | Mao Li-qun;Li Qing-lin;Zhang Zhi-jun .Study on surface states of Pt/TiO_2 thin film in different atmospheres[J].Solar Energy,2007(10):1280-1284. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%