利用水热法,以 Degussa P-25 TiO2粉末为原料,AlCl3、Fe(NO3)3·9H2O 和 ZnCl2为掺杂剂合成金属掺杂纳米管 TiO2,并采用透射电镜(TEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)和BET比表面积分析对催化剂进行表征。结果表明,掺杂金属分别以Al3+、Fe3+和Zn2+的形式存在。随着煅烧温度的增高,样品的比表面积逐渐降低,锐钛矿含量先增大后减小；金属掺杂后,催化剂比表面积略有降低,锐钛矿含量略有增大。考察紫外光催化臭氧化工艺中TiO2降解腐植酸标志物的催化效果,结果表明,450℃煅烧未掺杂纳米管 TiO2对腐植酸的催化降解效率为44%,较P-25TiO2粉末提高了11%；金属掺杂后催化效果提升明显,550℃煅烧 Fe 掺杂纳米管 TiO2的催化效果最为显著,腐植酸去除率达77%。
Ions-doped TiO2 nanotubes were synthesized via a hydrothermal method and characterized by trans-mission electron microscopy,X-ray diffraction,X-ray photoelectron spectroscopy and specific surface areas. The binding energies of Al2p,Fe2p and Zn2p indicated that the doping ions existed as Al3+,Fe3+ and Zn2+,re-spectively.With the increase of the calcination temperature,the specific surface area decreased.The intensity of anatase phase declined with enhancing the calcination temperature,and then decreased.The specific surface area decreased and the weight fractions of anatase phase increased when metal ions were doped into the catalyst. The removal efficiency of humic acid (HA)was 44% when un-doped TiO2 nanotubes calcined at 450℃ were added,11% higher than that in the presence of P-25 TiO2 powder.Fe-doped TiO2 nanotubes calcined at 550℃had the best photocatalytic activity,as 77% of HA was degraded when this catalyst was added.
参考文献
| [1] | Wiszniowski J;Robert D;Surmacz-Gorska J;Miksch K;Malato S;Weber JV .Solar photocatalytic degradation of humic acids as a model of organic compounds of landfill leachate in pilot-plant experiments: Influence of inorganic salts[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2004(2):127-137. |
| [2] | Fu Jianfeng;Zhao Yaqian;Wu Qiuli .Optimising photo-electrocatalytic oxidation of fulvic acid using response sur-face methodology[J].Journal of Hazardous Materials,2006,144(1-2):499-505. |
| [3] | Ming-Chi Wei;Kai-sung Wang;Tung-En Hsiao;I.-Chen Lin;Hui-Ju Wu;Yuh-Luan Wu;Pey-Horng Liu;Shih-Hsien Chang.Effects of UV irradiation on humic acid removal by ozonation Fenton and Fe~0/air treatment: THMFP and biotoxicity evaluation[J].Journal of hazardous materials,2011:324-331. |
| [4] | Xiong Feng;Croue J P;Legube B .Long term ozone con-sumption by aquatic fulvic acids acting as precursors of radical chain reactions[J].Environmental Science and Technology,1992,26(05):1059-1064. |
| [5] | A. Chin;P.R. Berube .Removal of disinfection by-product precursors with ozone-UV advanced oxidation process[J].Water research: A journal of the international water association,2005(10):2136-2144. |
| [6] | Lin C;Lin KS .Photocatalytic oxidation of toxic organohalides with TiO2/UV: The effects of humic substances and organic mixtures[J].Chemosphere: Environmental toxicology and risk assessment,2007(10):1872-1877. |
| [7] | Carp O;Huisman C L;Reller A .Photoinduced reactivity of titanium dioxide[J].Progress in Solid State Chemis-try,2004,32(1-2):133-177. |
| [8] | 胡安正,唐超群.纳米TiO2光催化材料及其应用于环境保护的研究进展[J].功能材料,2001(06):586-589,594. |
| [9] | 李晓平;徐宝琨;刘国范 等.纳米 TiO2 光催化降解水中有机污染物的研究与发展[J].功能材料,1999,30(03):242-245. |
| [10] | Sun, L;Li, J;Wang, CL;Li, SF;Chen, HB;Lin, CJ .An electrochemical strategy of doping Fe3+ into TiO2 nanotube array films for enhancement in photocatalytic activity[J].Solar Energy Materials and Solar Cells: An International Journal Devoted to Photovoltaic, Photothermal, and Photochemical Solar Energy Conversion,2009(10):1875-1880. |
| [11] | Yean Ling Pang;Ahmad Zuhairi Abdullah .Effect of low Fe~(3+) doping on characteristics, sonocatalytic activity and reusability of TiO_2 nanotubes catalysts for removal of Rhodamine B from water[J].Journal of hazardous materials,2012(Oct.15):326-335. |
| [12] | Choi W;Termin A;Hoffmann M R .The role of metal ion dopants in quantum-sized TiO2:correlation between photoreactivity and charge carrier recombination dynam-ics[J].Journal of Physical Chemistry,1994,98:13669-13679. |
| [13] | 赵翠华,陈建华,王晓林,龚竹青.Al3+离子掺杂对负载TiO2薄膜光催化活性的影响[J].环境科学与技术,2005(04):30-32. |
| [14] | 姜洪泉,王鹏,线恒泽,于凯.Zn2+掺杂TiO2纳米粉体的结构特性及光催化活性[J].哈尔滨工业大学学报,2007(08):1270-1275. |
| [15] | Pang, Y.L.;Abdullah, A.Z. .Comparative study on the process behavior and reaction kinetics in sonocatalytic degradation of organic dyes by powder and nanotubes TiO _2[J].Ultrasonics sonochemistry,2012(3):642-651. |
| [16] | Tachikawa T;Tojo S;Fujitsuka M;Sekino T;Majima T .Photoinduced charge separation in titania nanotubes[J].The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical,2006(29):14055-14059. |
| [17] | 邵颖,薛宽宏,何春建,陈巧玲,陶菲菲,沈伟,冯玉英.TiO2纳米管对十二烷基苯磺酸钠的光催化降解[J].化学世界,2003(04):174-178. |
| [18] | Spurr R A;Myers H .Quantitative analysis of anatase-rutile mixtures with an X-ray diffractometer[J].Analyt-ical Chemistry,1957,29(05):760-762. |
| [19] | 赵德明,汪大翚,史惠祥,颜晓莉.掺杂过渡金属离子的纳米二氧化钛光催化氧化对氯苯酚的研究[J].化工环保,2003(02):75-79. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%