Synthesis of novel thiol-functionalized mesoporous silica nanorods and their sorbent properties on heavy metals

Abstract

Novel thiol-functionalized mesoporous silica nanorods (MSNRs) were synthesized through a base co-condensation method, in which two organoalkoxysilanes, tetraethoxylsilane (TEOS) and bis[3-(triethoxysilyl)propyl]tetrasulfide (TESPT), were used as silica precursors simultaneously. TESPT was firstly used for both morphology control and inner surface functionalization of mesoporous silica hybrid materials. The microstructures as well as porous character of the MSNRs were characterized by means of SEM, XRD, TEM and N₂ sorption measurements. Infrared spectrum analysis and heavy metal ions (Ag⁺ and Cd²⁺) adsorption measurements were carried out to confirm the functionalized framework of MSNRs.

Keywords

nanocomposite / porous material / morphology control / inner surface functionalization / sorbent

References

[1] Kresge C T, Leonowicz M E, Roth W J, . Ordered mesoporous molecular-sieves synthesized by a liquid-crystal template mechanism. Nature , 1992, 359(6397): 710-712
[2] Beck J S, Vartuli J C, Roth W J, . A new family of mesoporous molecular sieves prepared with liquid crystal templates. Journal of the American Chemical Society , 1992, 114(27): 10834-10843
[3] Yang H, Kuperman A, Coombs N, . Synthesis of oriented films of mesoporous silica on mica. Nature , 1996, 379(6567): 703-705
[4] Zhao D Y, Feng J L, Huo Q S, . Triblock copolymer syntheses of mesoporous silica with periodic 50 to 300 angstrom pores. Science , 1998, 279(5350): 548-552
[5] Monnier A, Schüth F, Huo Q, . Cooperative formation of inorganic-organic interfaces in the synthesis of silicate mesostructures. Science , 1993, 261(5126): 1299-1303
[6] Huo Q S, Margolese D I, Ciesla U, . Generalized synthesis of periodic surfactant inorganic composite-materials. Nature , 1994, 368(6469): 317-321
[7] Feng P Y, Bu X H, Stucky G D, . Monolithic mesoporous silica templated by microemulsion liquid crystals. Journal of the American Chemical Society , 2000, 122(5): 994-995
[8] Lin H-P, Mou C-Y. Tubules-within-a-tubule hierarchical order of mesoporous molecular sieves in MCM-41. Science , 1996, 273(5276): 765-768
[9] Cai Q, Luo Z-S, Pang W-Q, . Dilute solution routes to various controllable morphologies of MCM-41 silica with a basic medium. Chemistry of Materials , 2001, 13(2): 258-263
[10] Cai Q, Lin W Y, Xiao F S, . The preparation of highly ordered MCM-41 with extremely low surfactant concentration. Microporous and Mesoporous Materials , 1999, 32(1-2): 1-15
[11] Klichko Y, Liong M, Choi E, . Mesostructured silica for optical functionality, nanomachines, and drug delivery. Journal of the American Ceramic Society , 2009, 92(s1): S2-S10
[12] Marlow F, McGehee M D, Zhao D, . Doped mesoporous silica fibers: A new laser material. Advanced Materials , 1999, 11(8): 632-636
[13] Rambaud F, Vallé K, Thibaud S, . One-pot synthesis of functional helicoidal hybrid organic-inorganic nanofibers with periodically organized mesoporosity. Advanced Functional Materials , 2009, 19(18): 2896-2905
[14] Liong M, Lu J, Kovochich M, . Multifunctional inorganic nanoparticles for imaging, targeting, and drug delivery. ACS Nano , 2008, 2(5): 889-896
[15] Lin H P, Mou C Y. Structural and morphological control of cationic surfactant-templated mesoporous silica. Accounts of Chemical Research , 2002, 35(11): 927-935
[16] Zhao D Y, Sun J Y, Li Q Z, . Morphological control of highly ordered mesoporous silica SBA-15. Chemistry of Materials , 2000, 12(2): 275-279
[17] Huh S, Wiench J W, Trewyn B G, . Tuning of particle morphology and pore properties in mesoporous silicas with multiple organic functional groups. Chemical Communications , 2003, (18): 2364-2365
[18] Sing K S W. Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity. Pure and Applied Chemistry , 1982, 54(11): 2201-2218