采用纳米涂层技术,以介孔分子筛SBA-15为模板,在其纳米孔道内引入糠醇/草酸溶液,经原位聚合,炭化后制得炭/SBA-15复合物.采用化学法脱除模板后制得具有规则结构的中孔炭.高分辨TEM表征结果显示该中孔炭是由纳米炭管相互联接、堆积而成,且具有六方对称结构.氮吸附结果显示其比表面积高达2 000 m2/g,孔径呈双峰分布.孔径相对较大的孔隙来源于SBA-15孔道经纳米涂层后所保留的孔隙;孔径相对较小的孔隙来源于SiO2移除后遗留的纳米孔空间.该方法可应用于以其他多孔氧化硅为模板制备新型纳米复合物的研究过程.
Ordered mesoporous carbon (OMC) with a bimodal pore system and high surface area has been synthesized by using SBA-15 as template and furfuryl alcohol as carbon source. The mesoporous surface area of the resultant OMC is as high as 2 000 m2/g. The pore size distribution shows a clear bimodal type. One mode of porosity with relatively small pore size originated from the void space created after removal of the silica matrix, and another with a relatively large pore size was generated from the center spaces inside of the hollow carbon tubes. Compared to the previous report, the advantages of the current synthesis strategy are that it involves one fewer step and that the amount of carbon precursor realized is determined simply by changing the concentration of the furfuryl alcohol solution. The current method is generally applicable to porous silica for thin layer coating with carbon, establishing access to valuable materials for the synthesis of new nanocomposites.
参考文献
| [1] | Jackie Y.Ying;Christian P.Mehnert;Michael S.Wong .Synthesis and applications of supramolecular-templated mesoporous materials[J].Angewandte Chemie International Edition,1999(1/2):56-77. |
| [2] | Ferdi Schuth .Non-siliceous Mesostructured and Mesoporous Materials[J].Chemistry of Materials,2001(10):3184-3195. |
| [3] | Kresge C T;Leonowicz M E;Roth W J et al.Ordered mesoporous molecular-sieves synthesized by a liquid-crystal template mechanism[J].Nature,1992,359:710-712. |
| [4] | Zhao D;Feng J;Huo Q et al.Triblock copolymer syntheses of mesoporous silica with periodic 50 to 300 angstrom pores[J].Science,1998,279:548-552. |
| [5] | Ryoo R.;Kruk M.;Jaroniec M.;Joo SH. .Ordered mesoporous carbons[J].Advanced Materials,2001(9):677-681. |
| [6] | Takashi Kyotani;Li-fu Tsai;Akira Tomita .Preparation of Ultrafine Carbon Tubes in Nanochannels of an Anodic Aluminum Oxide Film[J].Chemistry of Materials,1996(8):2109-2113. |
| [7] | Pradhan B K;Kyotani T;Tomita A.Nickel nanowires of 4 nm diameter in the cavity of carbon nanotubes[J].Chemical Communications,1999:1317-1318. |
| [8] | Xia Y N;Yang P D .One-dimensional nanostructures:synthesis characterization and applications[J].Advanced Materials,2003,15:353-389. |
| [9] | Ryoo R;Joo S H;Jun S J .Synthesis of highly ordered carbon molecular sieves via template-mediated structural transformation[J].Journal of Physical Chemistry B,1999,103:7743-7746. |
| [10] | Shin HJ.;Ryoo R.;Ko CH. .Synthesis of platinum networks with nanoscopic periodicity using mesoporous silica as template[J].Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology,2001(2):260-261. |
| [11] | Han Y J;Kim J M;Stucky G D .Preparation of noble metal nanowires using hexagonal mesoporous silica SBA-15[J].Chemistry of Materials,2000,12:2068-2069. |
| [12] | Joo S H;Choi S J;Oh I et al.Ordered nanoporous arrays of carbon supporting high dispersions of platinum nanoparticles[J].Nature,2001,412:169-172. |
| [13] | Ryoo R;Joo S H;Jun S et al.Ordered mesoporous carbon molecular sieves by templated synthesis:structural varieties[J].Studies in Surface Science and Catalysis,2001,135:150-158. |
| [14] | An-Hui Lu;Wolfgang Schmidt;Akira Taguchi;Bernd Spliethoff;Bernd Tesche;Ferdo Schuth .Taking Nanocasting One Step Further: Replicating CMK-3 as a Silica Material[J].Angewandte Chemie International Edition,2002(18):3489-3492. |
| [15] | Sing K S W;Everett D H;Haul R A W et al.Reporting physisorption data for gas/solid systems with special reference to the determination of surface area[J].Pure and Applied Chemistry,1985,57:603-619. |
| [16] | Fan J;Yu C;Wang L et al.Mesotunnels on the silica wall of ordered SBA-15 to generate three-dimensional large-pore mesoporous networks[J].Journal of the American Chemical Society,2001,123:12113-12114. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%