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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Synthesis of structurally stable MCM-48 using mixed surfactants as co-template and adsorption of vitamin B12 on the mesoporous MCM-48
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Synthesis of structurally stable MCM-48 using mixed surfactants as co-template and adsorption of vitamin B12 on the mesoporous MCM-48

机译：使用混合表面活性剂作为共模板合成结构稳定的MCM-48，并将维生素B12吸附在中孔MCM-48上

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Structurally stable MCM-48 mesoporous silica has been facilely synthesized by a new method using mixtures of cationic surfactant cetyltrimethylammonium bromide (CTAB) and nonionic poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer surfactant (Pluronic P123) as cotemplate. For comparison purpose, the cubic MCM-48 materialwas also prepared via only CTAB as the structuredirecting agent under the same synthesis conditions. The products obtained by different templating methods were thoroughly characterized by XRD, N_2 sorption, TEM and FT-IR spectroscopy. The results showed that the synergism effects of the binary system of cationic and nonionic surfactants favored the formation of cubic MCM-48 with extremely lowmolar ratio of CTAB to SiO_2 (0.125:1). Fromthe FT-IR spectra, the stronger intensity of Si-O-Si peaks and the reduction in the absorbance of the Si-OH stretch band of the product obtained via mixed surfactants, and combination of XRD, N_2 sorption, TEM, all measurement results clearly proved its structural stability. The improvement of the stability is attributed to the introduction of P123 resulting in pore wall thickened and a Si-OH group reduction on the pore surface. The adsorption of vitamin B12 on themesoporous MCM-48 obtained by different templatingmethods were studied. TheMCM-48 obtained via mixed surfactants showed higher adsorption capacity compared with the one obtained via the single cationic CTABtemplating route,which is associatedwith proper amount of Si-OHgroup on the pore surface and slit-shape pore structure.
机译：使用阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）和非离子型聚环氧乙烷-聚环氧丙烷-聚环氧乙烷三嵌段共聚物表面活性剂（Pluronic P123）的混合物通过新方法轻松合成了结构稳定的MCM-48介孔二氧化硅）作为共同模板。为了比较，在相同的合成条件下也仅通过CTAB制备立方MCM-48材料作为结构导向剂。通过XRD，N_2吸附，TEM和FT-IR光谱对通过不同模板方法获得的产物进行了彻底表征。结果表明，阳离子和非离子表面活性剂的二元体系的协同作用有利于形成立方MCM-48，其CTAB与SiO_2的摩尔比极低（0.125：1）。从FT-IR光谱中，通过混合表面活性剂获得的产品的Si-O-Si峰强度更强，Si-OH拉伸带的吸光度降低，以及XRD，N_2吸附，TEM的结合，所有测量结果清楚地证明了其结构稳定性。稳定性的提高归因于P123的引入，导致孔壁增厚，孔表面的Si-OH基团减少。研究了维生素B12在不同模板法制得的MCM-48上的吸附性能。通过混合表面活性剂获得的MCM-48与通过单一阳离子CTAB模板途径获得的MCM-48相比具有更高的吸附能力，这与孔表面上适量的Si-OH基团和狭缝状孔结构有关。

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