Effect of synthesis conditions on the mesoscopical order of mesoporous silica SBA-15 functionalized by amino groups

Wei, Qi; Nie, Zuoren; Hao, Ya-Li; Liu, Li; Chen, Zeng-Xiang; Zou, Jing-Xia

doi:10.1007/s10971-006-9171-3

Cited by 45 publications

(36 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This is in accordance with the trend of imprinted mesoporous silica reported by Lofgreen et al [12]. NIMS was made by pre-hydrolysis solgel process to avoid the interruption of the amino groups from the silica matrix to the surfactant template [19]. The isotherm of NIMS resembles with that of MIMS-2 due to the incorporation of amino-groups into the silica matrix, while the pore size distribution of NIMS is similar with that of PMS (Fig.…”

Section: Nitrogen Adsorption/desorption Characterizationsupporting

confidence: 89%

Dummy molecularly imprinted mesoporous silicates for selective adsorption of 2-naphthol

Luoa

Wang

et al. 2015

Open Chemistry

View full text Add to dashboard Cite

Abstract:Dummy molecularly imprinted mesoporous silicates (MIMS-2) were made by co-condensation of tetraethyl orthosilicate (TEOS) with precursors of bi-functional mimic of 2-naphthol, 2,7-dihydroxynaphthalene, around triblock copolymer surfactant Pluronic (P123) micelles. The bi-functional template was linked to two functional monomers through thermally cleavable covalent bonds to generate imprint precursor. This provides the possibility of incorporating the target into the cross-linked mesoporous silicate matrix in the non-ionic surfactant templated sol-gel process. P123 was eluted by ethanol extraction and template molecules were removed by refluxing the materials in a mixture of dimethyl sulfoxide (DMSO) and water. MIMS-1 was prepared similarly except that 2-naphthol was used as template instead of 2,7-dihydroxynaphthalene. Solid phase extraction studies showed that MIMS-2 exhibited good retention and selectivity for 2-naphthol among its structural analogues. The mono-functional molecule 2-naphthol was unable to be incorporated into the silica matrix of mesoporous material by the identical method, and the resulting material MIMS-1 exhibits poor selectivity to the template analogues.

show abstract

Section: Nitrogen Adsorption/desorption Characterizationsupporting

confidence: 89%

Dummy molecularly imprinted mesoporous silicates for selective adsorption of 2-naphthol

Luoa

Wang

et al. 2015

Open Chemistry

View full text Add to dashboard Cite

show abstract

“…It is very useful in areas such as heterogeneous base catalysis, toxic arsenate ion trapping, support for metallic nanoparticles, sensors, and enzyme immobilization. [23][24][25] Amine moiety has been incorporated in MCM-41-type mesoporous silica, [26][27][28][29][30] although the limitation of these materials is their small pores, which inhibit their application in catalysis in particular. 24 Amine functionalization of SBA-15-type mesoporous silica has been reported.…”

Section: Introductionmentioning

confidence: 99%

Improving Adsorbent Properties of Cage-like Ordered Amine Functionalized Mesoporous Silica with Very Large Pores for Bioadsorption

et al. 2009

View full text Add to dashboard Cite

In this paper, we report the successful synthesis of amine-functionalized FDU-12-type mesoporous silica with a very large pore (30.2 nm) and a highly ordered mesostructure by using 3-aminopropyltriethoxysilane (APTES) as an organosilane source. Small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) measurements confirmed that the materials possessed a face-centered cubic (space group Fm3 hm) mesostructure. Different techniques were used to obtain a significant pore and entrance size enlargement: low synthesis temperature and high hydrothermal treatment temperature. The amount of amine organosilane influenced the mesostructure of the mesoporous silica. It was found that the addition of inorganic salt (KCl) could help to maintain an ordered structure of the large pore mesoporous material. X-ray photoelectron spectroscopy (XPS), solid-state magic-angle spinning (MAS) 13 C nuclear magnetic resonance (NMR) and thermogravimetric analysis (TGA) verified the incorporation of amine functional groups on the surface of the materials. The addition of amine organosilane extended the synthesis temperature domain of ordered FDU-12 materials. The amine functional group significantly enhanced the adsorption capacity of the mesoporous materials, e.g., the amine functionalized mesoporous silica had 8-fold higher bovine serum albumin (BSA) adsorption capacity than that of the unfunctionalized one. It also had 2 times higher adsorption capacity for large cellulase enzymes. The amine functional group introduced positively charged groups on the surface of the mesoporous silica, which created strong electrostatic interactions between the protein and the silica.

show abstract

“…As proposed by Zhao et al [16], this is related to the unmatched hydrolysis rates between the aminosilane and TEOS, as well as the strong interference of the amine groups on the co-assembly process. To circumvent this "interference" problem, Wang et al [7] and Wei et al [17] successfully synthesized amine-functionalized SBA-15 with ordered large pores by pre-hydrolysis of the TEOS before the addition of aminopropyltriethoxysilane (APTES).…”

mentioning

confidence: 99%

Ordered SBA-15 mesoporous silica with high amino-functionalization for adsorption of heavy metal ions

Zhang

2012

Chin. Sci. Bull.

View full text Add to dashboard Cite

Surface NH 2 -functionalized SBA-15 mesoporous silica was synthesized using toluene diisocyanate (TDI) as a bridge molecule. First, the surface Si-OH groups of SBA-15 were reacted with the -NCO groups of TDI. Then, the remaining unreacted -NCO groups of TDI were reacted with the -NH 2 groups of ethylenediamine (EDA). Finally, the NH 2 -groups were successfully grafted onto the mesoporous SBA-15 surface by the above two-step method. XRD, N 2 adsorption-desorption analysis, FT-IR, and 29 Si MAS NMR were used to identify the well-ordered structure and the successful incorporation of the -NH 2 groups onto the surface of the synthesized materials. Characterizations revealed that such -NH 2 grafting is an effective method to obtain a high loading of -NH 2 groups onto the SBA-15. When subjected to toxic heavy metal ions in aqueous solution, the obtained NH 2 -functionalized SBA-15 showed very high adsorption rates 99.9%, 99.7%, 99.8%, 99.5% and 99.9% for Pb 2+ , Cr 3+ , Cd 2+ , Ag + and the Cu 2+ , respectively, which is attributed to the strong complexation reactions between the metal ions and the grafted -NH 2 groups. [5,6]. Traditionally, this kind of aminosilica material is synthesized primarily by two main strategies; one is the direct method [7][8][9][10][11], and the other is the post-synthesis method [12][13][14][15]. In a direct method, aminofunctionalized large-pore mesoporous materials were synthesized by co-condensation of tetraethoxysilane (TEOS) and aminosilanes. The advantage of the direct method is that amine groups can be easily incorporated into the framework of mesoporous materials. However, disordered amino-functionalized mesoporous silica was obtained by the direct co-condensation method. As proposed by Zhao et al.[16], this is related to the unmatched hydrolysis rates between the aminosilane and TEOS, as well as the strong interference of the amine groups on the co-assembly process. To circumvent this "interference" problem, Wang et al. [7] and Wei et al. [17] successfully synthesized amine-functionalized SBA-15 with ordered large pores by pre-hydrolysis of the TEOS before the addition of aminopropyltriethoxysilane (APTES). Despite considerable progress having been made for the one-pot synthesis of amino-functionalized mesoporous silica, approaches based on post-synthetic functionalization remain popular because the separation of the silica synthesis and functionalization steps allows an independent and more straightforward control of the pore size and periodicity. Therefore, the post-synthesis method could be favorable for the formation of well-ordered structures. But the amino chains that have been first grafted onto the mesoporous

show abstract

Effect of synthesis conditions on the mesoscopical order of mesoporous silica SBA-15 functionalized by amino groups

Cited by 45 publications

References 23 publications

Dummy molecularly imprinted mesoporous silicates for selective adsorption of 2-naphthol

Dummy molecularly imprinted mesoporous silicates for selective adsorption of 2-naphthol

Improving Adsorbent Properties of Cage-like Ordered Amine Functionalized Mesoporous Silica with Very Large Pores for Bioadsorption

Ordered SBA-15 mesoporous silica with high amino-functionalization for adsorption of heavy metal ions

Contact Info

Product

Resources

About