以复合表面活性剂为模板,采用微波辐射、二甲苯萃取脱除模板剂法制备了介孔材料WO_3·0.33H_2O、WO_3·NiO·0.33H_2O,利用XRD、TGA、TEM、BET等手段表征了材料的结构、形貌、比表面积、孔径分布.结果表明,微波辐射比传统加热法制备的材料晶粒小,结晶度高,孔径分布更均匀,比表面积更大;制备的材料WO_3·NiO·0.33H_2O介孔呈现蠕虫状,掺杂Ni~(2+)能稳定介孔结构,抑制晶粒长大,其比表面积达66.37m~2·g~(-1).分别以WO_3·NiO·0.33H_2O催化剂考察在紫外光(UV)、黑光灯、可见光3种光源下对气相甲醛光催化降解反应动力学规律及紫外光下的催化稳定性,其光催化降解气相甲醛降解率为传统加热法样品的3倍,在可见光下达76.8%.
Using composite surfaetant as template-directing agent, WO_3·0.33H_2O、WO_3·NiO·0.33H_2O mesopomus materials were synthesized by microwave irradiation and then extraction with dimethylbenzene solution to remove the surfactant species. The properties of the materials were investigated by means of XRD, TGA, TEM and BET. The results show that the materials synthesized by microwave irradiation exhibit smaller erystallite size, uniform pore size distribution, larger specific surface area compared with those by conventional heating methods. The WO_3·NiO·0.33H_2O prepared have the worm hole-like mesoporous structure, which can be stabilized and its crystallite size can be controlled by doping with transition metals Ni~(2+). Specific surface area of the material is 66.37 m~2·g~(-1). The reaction kinetics laws of photoeatalytic degradation of gaseous formaldehyde were studied under irradiation of ultraviolet (UV), black light lamp and visible light, respectively, and the stability of the photoeatalysts in ultraviolet light were checked. The photodegradation efficiency for gas-phase formaldehyde of WO_3·NiO·0.33H_2O is 3 times as large as that of WO_3·H_2O which is prepared by conventional heating methods in ultraviolet light and is 76.8 % in visible light.
参考文献
| [1] | Hou Q;Margoless D L;Ciesla V .Generalized synthesis of periodic surfactant inorganic composite materials[J].Nature,1994,368:317-321. |
| [2] | Vartuli J C;Sciivr K D;Kresge C T .Effect of surfactant/silica molar ratios on the formation of mesoporous molecular sieves:inorganic mimicry of surfactant liquid-crystal phases and mechanistic implications[J].Chemistry of Materials,1994,6(12):2317-2 326. |
| [3] | Bharat L.Newalkar;Johnson Olanrewaju;Sridhar Komarneni .Microwave-Hydrothermal Synthesis and Characterization of Zirconium Substituted SBA-15 Mesoporous Silica[J].The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical,2001(35):8356-8360. |
| [4] | Liang JH.;Deng ZX.;Jiang X.;Li FL.;Li YD. .Photoluminescence of tetragonal ZrO2 nanoparticles synthesized by microwave irradiation[J].Inorganic Chemistry: A Research Journal that Includes Bioinorganic, Catalytic, Organometallic, Solid-State, and Synthetic Chemistry and Reaction Dynamics,2002(14):3602-3604. |
| [5] | Ren T Z;Yuan Z Y;Su B L .Microwave-assisted preparation of hierarchical mesoporous-macroporous boehmite AIO0H and (A)-Al_2O_3[J].Langmuir,2004,20(05):1531-1534. |
| [6] | Gratian RBamwenda;Hironori Arakawa .The visible light induced photocatalytic activity of tungsten trioxide powders[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2001(1/2):181-191. |
| [7] | 孙亚萍,赵靓,赵景联,侯永平,种法国,梁勇.二氧化钛固载杂多酸催化剂的制备及其光催化性能研究[J].高校化学工程学报,2006(04):554-558. |
| [8] | V. Iliev;D. Tomova;L. Bilyarska;L. Prahov;L. Petrov .Phthalocyanine modified TiO_2 or wo_3-catalysts for photooxidation of sulfide and thiosulfate ions upon irradiation with visible light[J].Journal of Photochemistry and Photobiology, A. Chemistry,2003(3):281-287. |
| [9] | A. Fuerte;M. D. Hernandez-Alonso;A. J. Maira;A. Martinez-Arias;M. Fernandez-Garcia;J. C. Conesa;J. Soria;G. Munuera .Nanosize Ti-W Mixed Oxides: Effect of Doping Level in the Photocatalytic Degradation of Toluene Using Sunlight-Type Excitation[J].Journal of Catalysis,2002(1):1-9. |
| [10] | Gratian R.Bamwenda;Takashi Uesigi;Yoshimoto Abe .The photocatalytic oxidation of water to O_2 over pure CeO_2,WO_3,and TiO_2 using Fe~(3+) and Ce~(4+) as electron acceptors[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2001(1/2):117-128. |
| [11] | Bamwenda GR.;Arakawa H. .The photoinduced evolution of O-2 and H-2 from a WO3 aqueous suspension in the presence of Ce4+/Ce3+[J].Solar Energy Materials and Solar Cells: An International Journal Devoted to Photovoltaic, Photothermal, and Photochemical Solar Energy Conversion,2001(1):1-14. |
| [12] | 程利芳,张兴堂,陈艳辉,刘兵,李蕴才,黄亚彬,杜祖亮.一种新的WO3纳米管的制备方法[J].高等学校化学学报,2004(09):1621-1623. |
| [13] | Hiroshi K;Jun-ichi K;Shin-yaM et al.Solvothermal syntheses of semiconductor photocatalysts of ultra-high activities[J].Catalysis Today,2003,84(01):181-189. |
| [14] | Yoshiko T;Junko N K;Tsuyoshi T .Mesoporous tantalum oxide characterization and photocatalytic activity for the overall water decomposition[J].CHEMISTRY OF MATERIALS,2001,13(05):1194-1199. |
| [15] | Jan H;Dmitry S;Shchukin G et al.Photocatalytic activities of porous titania and titania/ zirconia structures formed by using a polymer gel templating technique[J].Chemistry of Materials,2002,14(15):5103-5108. |
| [16] | 付贤智,李旦振.提高多相光催化氧化过程效率的新途径[J].福州大学学报(自然科学版),2001(06):104-114. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%