以溶胶-凝胶法制备的TiO2纳米粒子为载体,通过浸渍法制备了Au/TiO2样品,并利用XPS和SPS等技术对样品进行表征,考察了热处理温度和Au含量对TiO2纳米粒子光催化氧化苯酚活性的影响. 结果表明,Au是以金属纳米微晶的形式均匀地分散在TiO2纳米粒子表面. 用适量Au进行表面修饰不仅拓宽了TiO2对光的响应范围,而且改善了TiO2光生电子和空穴的分离效率,提高了样品对氧物种的吸附,并促进了光生电子向吸附氧的传输. 在光催化氧化苯酚反应中,500 ℃处理的Au/TiO2纳米粒子具有较高的光催化活性,这与XPS和SPS表征结果是一致的. 从电子能级匹配的角度揭示了Au对TiO2样品表面光电性质和光催化性能的影响机制.
参考文献
| [1] | Fox M A;Dulay M T .[J].Chemical Reviews,1993,93(01):341. |
| [2] | Hoffmann M R;Martin S T;Choi W Y;Bahnemann D W .[J].Chemical Reviews,1995,95(01):69. |
| [3] | Litter M I .[J].Applied Catalysis B:Environmental,1999,23(2-3):89. |
| [4] | Fujishima A;Rao T N;Tryk D A .[J].Journal of Photochemistry and Photobiology C:Photochemistry Reviews,2000,1(01):1. |
| [5] | Chatterjee D. .Photocatalytic reduction of hydrazine to ammonia catalysed by [Ru-III(edta)(H2O)](-) complex in a Pt/TiO2 semiconductor particulate system[J].Journal of molecular catalysis, A. Chemical,2000(1/2):1-3. |
| [6] | Sclafani A;Mozzanega M-N;Pichat P .[J].Journal of Photochemistry and Photobiology A:Chemistry,1991,59(02):181. |
| [7] | Thompson D .[J].Gold Bulletin,1996,29(01):94. |
| [8] | 井立强,孙晓君,蔡伟民,李晓倩,付宏刚,候海鸽,范乃英.掺杂Ce的TiO2纳米粒子的光致发光及其光催化活性[J].化学学报,2003(08):1241-1245. |
| [9] | Li KY.;Wu FQ.;Xie TF.;Li TJ.;Wang DJ. .Surface electronic states and photovoltage gas-sensitive characters of nanocrystalline LaFeO3[J].Materials Chemistry and Physics,2000(3):269-272. |
| [10] | Qian X M;Qin D Q;Song Q;Bai Y B,Li T J,Tang X Y,Wang E K,Dong Sh J .[J].Thin Solid Films,2001,385(1-2):152. |
| [11] | Zhang Q H;Gao L;Guo J K .[J].Applied Catalysis B:Environmental,2000,26(03):207. |
| [12] | Jing LQ.;Sun XJ.;Shang J.;Cai WM.;Xu ZL. .The surface properties and photocatalytic activities of ZnO ultrafine particles[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2001(3/4):308-314. |
| [13] | Linsebigler A L;Lu G Q;Yates J T .[J].Chemical Reviews,1995,95(03):735. |
| [14] | Jing LQ.;Sun XJ.;Shang J.;Cai WM.;Xu ZL.;Du YG.;Fu HG. .Review of surface photovoltage spectra of nano-sized semiconductor and its applications in heterogeneous photocatalysis[J].Solar Energy Materials and Solar Cells: An International Journal Devoted to Photovoltaic, Photothermal, and Photochemical Solar Energy Conversion,2003(2):133-151. |
| [15] | Kronik L;Shapira Y .[J].Surface Science Reports,1999,37(1-5):1. |
| [16] | 井立强,孙晓君,蔡伟民,徐自力,杜尧国,傅宏刚.ZnO纳米粒子的表面光电压谱和光催化性能[J].化学学报,2002(10):1778-1783. |
| [17] | Sadeghi M;Liu W;Zhang T G;Stavropoulos P, Levy B .[J].Journal of Physical Chemistry,1996,100(50):19466. |
| [18] | Gerisher H;Heller A .[J].Journal of Physical Chemistry,1991,95(13):5261. |
| [19] | Jing LQ.;Sun XJ.;Cai WM.;Xu ZL.;Du YG.;Fu HG. .The preparation and characterization of nanoparticle TiO2/Ti films and their photocatalytic activity[J].The journal of physics and chemistry of solids,2003(4):615-623. |
| [20] | Bahnemann D W;Hilgendorff M;Memming R .[J].Journal of Physical Chemistry B,1997,101(21):4265. |
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%