采用多壁碳纳米管( MWCNTs)为载体,分别以醋酸镉((CH3 COO)2 Cd·2H2 O)和硫化钠(Na2S·5H2O)为镉源和硫源,经简单逐滴滴入途径制备了CdS/CNT复合材料.再以四丁氧基钛(TNB)为钛源,苯为溶剂,成功地将二氧化钛(TiO2)纳米粒子沉积在CdS修饰的MWCNTs表面而得到CdS/CNT-TiO2光催化剂.利用N2吸附等温线、扫描电子显微镜、X射线衍射、能量分散性X射线分析以及透射电子显微镜对所制CdS/CNT-TiO2光催化剂进行表征.CdS/CT-TiO2复合材料呈多孔结构,MWCNTs均匀分散在材料中,且未出现明显的TiO2和CdS纳米颗粒团聚体.该材料在紫外和可见光照射下对亚甲基蓝具有优异的降解活性.这不仅归因于TiO2对自由基的反应和MWCNTs吸附能力,且归因于引入窄带隙半导体CdS,使粒子在MWCNTs表面的电子转移速率得到提高.
Novel CdS/CNT-TiO2 photocatalysts were synthesized by a simple chemical routine through the drop-wise addition of Na2S·5H2O solutions to cadmium acetate solutions containing purified multiwall carbon nanotubes (MWC-NTs).The CdS/CNT materials obtained were treated with titanium (Ⅳ) n-butoxide to form CdS/CNT-TiO2 composites which were characterized by N2 adsorption,XRD,TEM,SEM,and energy-dispersive X-ray analysis.The composites were found to be porous,and the MWCNTs were homogenously dispersed in the composites without any apparent agglomeration of TiO2 nanoparticles and CdS nanoparticles.The CdS/CNT-TiO2 composites exhibited excellent activity for the degradation of methylene blue under UV and visible-light irradiation.This was attributed not only to the photocatalysis of the supported TiO2 for the radical reaction and the adsorptivity of MWCNTs,but also to the introduction of the narrow-band gap semiconductor CdS that in.eases the transfer rate of photogenerated electrons through the surface of the
参考文献
| [1] | Murakami N;Mahaney O O P;Abe R et al.Double-beam photoacoustic spectroscopic studies on transient absorption of titanium(Ⅳ) oxide photocatalyst powders[J].Journal of Physical Chemistry C,2007,111(32):11927-11935. |
| [2] | Sung-Mao Chiu;Zhi-Sheng Chen;Kuo-Yuan Yang .Photocatalytic activity of doped TiO_2 coatings prepared by sputtering deposition[J].Journal of Materials Processing Technology,2007(0):60-67. |
| [3] | Xin Jiang;Ting Wang .Preparation of TiO_2 Nanoparticles on Different SiO_2 Supports by the Adsorption Phase Technique[J].Journal of the American Ceramic Society,2008(1):46-50. |
| [4] | S. Neatu;E. Sacaliuc-Parvulescu;F. Levy .Photocatalytic decomposition of acetone over dc-magnetron sputtering supported vanadia/TiO2 catalysts[J].Catalysis Today,2009(3/4):165-169. |
| [5] | Hoffmann M R;MartinS T;Choi W Y et al.Environmental applications of semiconductor photocatalysis chem[J].Chemical Reviews,1995,95:69-96. |
| [6] | Zhao J;Wu T;Oikawa K et al.Photoassisted degradation of dye pollutants.3.degradation of the cationic dye rhodamine b in aqueous anionic surfactant/TiO2 dispersions under visible light Irradiation:evidence for the need of substrate adsorption on TiO2 particles[J].Science Technology,1998,32:2394-2400. |
| [7] | Park H;Choi W .Effects of TiO2 surface fluorination on photocatalytic reactions and photoelectrochemical behaviors[J].Journal of Physical Chemistry B,2004,108:4086-4093. |
| [8] | Ha RP;Zhang GX;Wu QS;Ding YP .Preparation, structures and photoluminescent enhancement of CdWO4-TiO2 composite nanofilms[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2006(4):2038-2042. |
| [9] | K.Nagaveni;M.S.Hegde;N.Ravishankar;G.N.Subbanna;Giridhar Madras .Synthesis and Structure of Nanocrystalline TiO_2 with Lower Band Gap Showing High Photocatalytic Activity[J].Langmuir: The ACS Journal of Surfaces and Colloids,2004(7):2900-2907. |
| [10] | Zou Z;Ye J;Sayama K;Arakawa H .Direct splitting of water under visible light irradiation with an oxide semiconductor photocatalyst[J].Nature,2001,414:625-627. |
| [11] | Kim H.;Kim D. .Influence of CdS heat treatment on the microstructure of CdS and the performance of CdS/CdTe solar cells[J].Solar Energy Materials and Solar Cells: An International Journal Devoted to Photovoltaic, Photothermal, and Photochemical Solar Energy Conversion,2001(1/4):297-304. |
| [12] | Wang ZL. .Characterizing the structure and properties of individual wire-like nanoentities[J].Advanced Materials,2000(17):1295-1298. |
| [13] | Chen M;Kim YN;Li C;Cho SO .Controlled synthesis of hyperbranched cadmium sulfide micro/nanocrystals[J].Crystal growth & design,2008(2):629-634. |
| [14] | Zhao PT;Huang KX .Preparation and characterization of netted sphere-like CdS nanostructures[J].Crystal growth & design,2008(2):717-722. |
| [15] | Jum Suk Jang;Hyun Gyu Kim;Upendra A;Joshi;Ji Wook Jang;Jae Sung Lee .Fabrication Of Cds Nanowires Decorated With Tio_2 Nanoparticles For Photocatalytic Hydrogen Production Under Visible Light Irradiation[J].International journal of hydrogen energy,2008(21):5975-5980. |
| [16] | D.J. Kim;Y.-M. Yu;J.W. Lee;Y.D. Choi .Investigation of energy band gap and optical properties of cubic CdS epilayers[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2008(22):7522-7526. |
| [17] | J.K. Dongre;Vikas Nogriya;M. Ramrakhiani .Structural, Optical And Photoelectrochemical Characterization Of Cds Nanowire Synthesized By Chemical Bath Deposition And Wet Chemical Etching[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2009(12):6115-6120. |
| [18] | Valyomana A G;Vijayakumar K P;Purushothaman C .Conductivity studies on spray-pyrolysed CdS films in ambient conditions[J].Journal of Materials Science Letters,1992,11:616-618. |
| [19] | Chavez H;Jordan M;McClure J C et al.Physical and electrical characterization of CdS films deposited by vacuum evaporation,solution growth and spray pyrolysis[J].J Mater Sci:Electr Mater,1997,8:151-154. |
| [20] | i zci F;Kose S;M S K(y)l(y)kaya .Electrical,optical and srtuctural properties of Cd1-x Inx S films grown by spray pyrolysis method[J].Proc Suppl Bpl,1997,5:1115-1159. |
| [21] | Valyomana A G;Vijayakumar K P;Purushothaman C .Effect of annealing temperatures on the electrical transport properties of spray-pyrolysed CdS films[J].Journal of Materials Science Letters,1990,9:1025-1027. |
| [22] | Al Kuhaimi S A .Influence of prepation technique on the structural,optical and electrical properties of polycrystalline CdS films[J].Vacuum,1998,51:349-355. |
| [23] | Xiao MW;Wang LS;Wu YD;Huang XJ;Dang Z .Preparation and characterization of CdS nanoparticles decorated into titanate nanotubes and their photocatalytic properties[J].Nanotechnology,2008(1):15706-1-15706-7-0. |
| [24] | Wellmann H;Rathousky J;Wark M et al.Formation of CdS nanoparticles within functionalized siliceous MCM-41[J].Microporous and Mesoporous Materials,2001,44-45:419-425. |
| [25] | Su Young Ryu;William Balcerski;T. K. Lee .Photocatalytic Production of Hydrogen from Water with Visible Light Using Hybrid Catalysts of CdS Attached to Microporous and Mesoporous Silicas[J].The journal of physical chemistry, C. Nanomaterials and interfaces,2007(49):18195-18203. |
| [26] | Yuxiang Yu;Dongsheng Xu .Single-crystalline TiO2 nanorods:Highly active and easily recycled photocatalysts[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2007(1/2):166-171. |
| [27] | Rima Paul;P. Kumbhakar;A.K. Mitra .Visible photoluminescence of MWCNT/CdS nanohybrid structure synthesized by a simple chemical process[J].Materials Science & Engineering, B. Solid-State Materials for Advanced Technology,2010(2):97-101. |
| [28] | Profumo A;Fagnoni M;Merli D;Quartarone E;Protti S;Dondi D;Albini A .Multiwalled carbon nanotube chemically modified gold electrode for inorganic as speciation and Bi(III) determination[J].Analytical chemistry,2006(12):4194-4199. |
| [29] | 陈明亮,张峰君,吴沅春.CNT/TiO2复合材料的合成、表征及其光催化性能分析[J].新型炭材料,2009(02):159-166. |
| [30] | Lee SH;Pumprueg S;Moudgil B;Sigmund W .Inactivation of bacterial endospores by photocatalytic nanocomposites[J].Colloids and Surfaces, B. Biointerfaces,2005(2):93-98. |
| [31] | Won-Chun Oh;Feng-Jun Zhang;Ming-Liang Chen .Synthesis and characterization of V-C_(60)/TiO2 photocatalysts designed for degradation of methylene blue[J].Journal of industrial and engineering chemistry,2010(2):299-304. |
| [32] | Oh, Won-Chun;Jung, Ah-Reum;Ko, Weon-Bae .Characterization and relative photonic efficiencies of a new nanocarbon/TiO2 composite photocatalyst designed for organic dye decomposition and bactericidal activity[J].Materials science & engineering, C. Biomimetic and supramolecular systems,2009(4):1338-1347. |
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%