以纳米TiO_2(P25)为前驱体,采用水热-煅烧法制备了具有大比表面积和高紫外光催化活性的TiO_2纳米棒(TiO_2-NRs),并考察了热处理温度对其形貌、晶型、比表面积及光催化活性的影响.以400℃热处理制得的TiO_2-NRs为载体,采用溶胶-凝胶法制得负载型WO_3/TiO_2-NRs复合光催化剂,并使用透射电镜、X射线衍射和X射线电子能谱等手段对其进行了表征.结果表明,WO_3负载量为2%时,WO_3/TiO_2-NRs的光催化活性是P25的5倍.对1×10~(-5)mol/L罗丹明B溶液的脱色反应结果表明,该催化剂具有高速染料脱色特性.同时对光催化机理进行了探讨.
TiO_2 nanorods (TiO_2-NRs) with high specific surface area and excellent photoactivity were prepared by a hydrothermo-calcination method with TiO_2 (P25) precursor. The effects of calcination temperature on the morphology, crystallization, specific surface area, and photocatalytic activity of TiO_2-NRs were investigated. The TiO_2-NRs sample calcined at 400 ℃ had the highest photocatalytic activity and was used as the support to deposit WO_3 nanoparticles by a sol-gel method to prepare the supported composite photocatalyst (WO_3/TiO_2-NRs). The photocatalyst samples were characterized by transmission electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction. The photocatalytic activity evaluation exhibited that the 2%WO_3/TiO_2-NRs sample had the highest activity, which was 5 times that of P25. The decolorization experiment for rhodamine B solution (1 ×10~(-5) mol/L) indicated its excellent decolorization performance. The reaction mechanism over the composite catalyst was discussed.
参考文献
| [1] | 王怡中.二氧化钛悬浆体系中八种染料的太阳光催化氧化降解[J].催化学报,2000(04):327-331. |
| [2] | 张建臣,郭坤敏,马兰,赵红阳.TiO2/AC复合光催化剂对苯和丁醛的气相光催化降解机理[J].催化学报,2006(10):853-856. |
| [3] | 曾炽涛,陈爱平,陈爱华,刘伟,戴智铭.负载型TiO2/玻璃弹簧的光催化杀菌作用[J].催化学报,2003(07):520-524. |
| [4] | Spanhel L;Weller H;Henglein A .[J].Journal of the American Chemical Society,1987,109:6632. |
| [5] | Gopidas K R;Bohorquez M;Kamat P V .[J].Journal of Physical Chemistry,1990,94:6435. |
| [6] | Vinodgopal K;Kamat P V .[J].Environmental Science and Technology,1995,29:841. |
| [7] | Chen S F;Chen L;Gao S;Cao G Y .[J].Powder Technology,2005,160:198. |
| [8] | Tian H;Ma J F;Li K;Li J J .[J].Materials Chemistry and Physics,2008,112:47. |
| [9] | Song KY;Park M K;Kwon YT;Lee H W Chung W J Lee W 1 .[J].CHEMISTRY OF MATERIALS,2001,13:2349. |
| [10] | Puddu, V;Mokaya, R;Puma, GL .Novel one step hydrothermal synthesis of TiO2/WO3 nanocomposites with enhanced photocatalytic activity[J].Chemical Communications,2007(45):4749-4751. |
| [11] | Kwon YT.;Lee WI.;Choi GJ.;Do YR.;Song KY. .Photocatalytic behavior of WO3-loaded TiO2 in an oxidation reaction[J].Journal of Catalysis,2000(1):192-199. |
| [12] | Fu X;Clark L A;Yang Q;Anderson M A .[J].Environmental Science and Technology,1996,30:647. |
| [13] | Zhu H Y;Lan Y;Gao X P;Ringer S P Zheng Z F Song D Y Zhao J C .[J].Journal of the American Chemical Society,2005,127:6730. |
| [14] | Nian J N;Teng H .[J].Journal of Physical Chemistry B,2006,110:4193. |
| [15] | Peng C W;Ke T Y;Brohan L;Richard-Plouet M Huang J C Puzenat E Chiu H T Lee C Y .[J].Chemistry of Materials,2008,20:2426. |
| [16] | Huang JQ;Huang Z;Guo W;Wang ML;Cao YG;Hong MC .Facile synthesis of titanate nanoflowers by a hydrothermal route[J].Crystal growth & design,2008(7):2444-2446. |
| [17] | Tsai CC;Teng H .Nanotube formation from a sodium titanate powder via low-temperature acid treatment[J].Langmuir: The ACS Journal of Surfaces and Colloids,2008(7):3434-3438. |
| [18] | Kasuga T.;Hoson A.;Sekino T.;Niihara K.;Hiramatsu M. .Titania nanotubes prepared by chemical processing[J].Advanced Materials,1999(15):1307-1311. |
| [19] | Wang Sh;Wang T;Chen W X;Hori T.[J].Chemistry Communications,2008:3756. |
| [20] | Wang T;Wang Sh;Chen W X;Wang W Xu Zh L Liu Y Hori T .[J].Journal of Materials Chemistry,2009,19:4692. |
| [21] | Ratanatawanate C;Xiong C;Balkus K J Jr .[J].ACS Nano,2008,2:1682. |
| [22] | Yang XL;Dai WL;Guo CW;Chen H;Cao Y;Li HX;He HY;Fan KN .Synthesis of novel core-shell structured WO3/TiO2 spheroids and its application in the catalytic oxidation of cyclopentene to glutaraldehyde by aqueous H2O2[J].Journal of Catalysis,2005(2):438-450. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%