Adsorption of Pyruvic and Succinic Acid by Amine-Functionalized SBA-15 for the Purification of Succinic Acid from Fermentation Broth

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• 作者：Young-Si Jun ; Yun Suk Huh ; Ho Seok Park ; Arne Thomas ; Sang Jun Jeon ; Eun Zoo Lee ; Hyo Jin Won ; Won Hi Hong ; Sang Yup Lee ; Yeon Ki Hong
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：September 6, 2007
• 年：2007
• 卷：111
• 期：35
• 页码：13076 - 13086
• 全文大小：734K
• 年卷期：v.111,no.35(September 6, 2007)
• ISSN：1932-7455

文摘

In this study, mesoporous silica SBA-15 was functionalized with primary, secondary, and tertiary amino-functional silanes onto the channel walls using a postsynthesis method as a first attempt to purify succinicacid from a fermentation broth. Ordered mesostructures of pristine and functionalized SBA-15 were evaluatedusing small-angle X-ray scattering (SAXS), transmission electron microscopy (TEM), and N₂ adsorption/desorption isotherms. ¹³C and ²⁹Si magic-angle spinning (MAS) nuclear magnetic resonance (NMR) with ¹Hcross-polarization (CP-MAS) and thermogravimetric analysis (TGA) revealed that amino-functional silaneswere covalently bound to the active layer of pore walls. The distribution and accessibility of amine groupswere characterized by scanning transmission electron microscopy (STEM), elemental analysis, and conductivitymeasurements. Adsorption isotherms were analyzed using the Sips model, simultaneously obtaining thetemperature dependence of isotherms derived from the isosteric heats of adsorption. Pyruvic acid had higheradsorption capacities than succinic acid on amine-functionalized SBA-15, resulting in the selective adsorptionof pyruvic acid from binary acid solution. In particular, SBA-15 functionalized with primary amino silaneobtained higher selectivity on pyruvic acid compared to that of other amine-functionalized SBA-15. Theadsorption capacities of pyruvic acid at equilibrium are dependent on the basicity and distribution of aminosilanes. The isosteric heats between 10 and 100 kJ/mol and desorption energy between 1 and 10 kJ/molrevealed that the adsorption of pyruvic and succinic acid originated from the formation of an acid-aminecomplex via hydrogen bonding. It is proposed that the amine functionalization of ordered mesoporous solidsprovides a simple and effective method of separating or purifying useful carboxylic acids.