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首页> 外文期刊>Materials Chemistry and Physics >Adsorption of L-phenylalanine onto mesoporous silica
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Adsorption of L-phenylalanine onto mesoporous silica

机译：L-苯丙氨酸在介孔二氧化硅上的吸附

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摘要

Mesoporous silica materials, such as SBA-3, SBA-15, SBA-16 and KIT-6 were synthesized using tetraethyl orthosilicate as the silica source and different surfactants as templates. The products were characterised by a number of techniques, including low-temperature nitrogen sorption, X-ray diffraction and transmission electron microscopy. Results of the studies confirmed the ordered mesoporous structures of all silica samples obtained. Adsorption of L-phenylalanine on various mesoporous adsorbents was studied from solutions with different pH (5.6-9.4). Maximum sorption capacity was observed at pH 5.6, which is close to the isoelectric point of L-phenylalanine (pI = 5.48). Above this pH value, the amount of adsorbed amino acid decreased. In the range of equilibrium concentration (pH 5.6), the adsorption capacities of ordered silica samples decreased in the following order: KIT-6 (420 μmol g~(-1)) > SBA-15 (389 μmol g~(-1) ＞ SBA-16 (357 μmol g~(-1)) ＞ SBA-3 (219 μmol g~(-1)). The lowest sorption capacity towards L-phenylalanine was found for SBA-3 despite the fact that it showed the largest surface area, which can be explained assuming that part of the pores in SBA-3 can be inaccessible to L-phenylalanine molecules. Large pore size of KIT-6 and SBA-15 permitted the amino acid molecule to enter into the pores of these mesoporous molecular sieves.
机译：以原硅酸四乙酯为二氧化硅源，以不同表面活性剂为模板，合成了SBA-3，SBA-15，SBA-16和KIT-6等介孔二氧化硅材料。产品通过多种技术进行表征，包括低温氮吸附，X射线衍射和透射电子显微镜。研究结果证实了所获得的所有二氧化硅样品的有序介孔结构。从具有不同pH（5.6-9.4）的溶液中研究了L-苯丙氨酸在各种介孔吸附剂上的吸附。在pH 5.6处观察到最大吸附容量，接近L-苯丙氨酸的等电点（pI = 5.48）。高于此pH值，氨基酸的吸附量减少。在平衡浓度（pH 5.6）范围内，有序二氧化硅样品的吸附容量按以下顺序降低：KIT-6（420μmolg〜（-1））> SBA-15（389μmolg〜（-1）） ＞ SBA-16（357μmolg〜（-1））＞ SBA-3（219μmolg〜（-1）），SBA-3对L-苯丙氨酸的吸附能力最低，尽管它显示出最大的表面积，这可以解释为假设L-苯丙氨酸分子无法进入SBA-3中的部分孔，KIT-6和SBA-15的大孔径使氨基酸分子进入这些孔中介孔分子筛。

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  • 来源
    《Materials Chemistry and Physics》 |2013年第3期|586-593|共8页
  • 作者

    Joanna Goscianska; Anna Olejnik; Robert Pietrzak;

  • 作者单位

    Faculty of Chemistry, Adam Mickiewicz University in Poznan, Umultowska 89b, 61-614 Poznan, Poland;

    Faculty of Chemistry, Adam Mickiewicz University in Poznan, Umultowska 89b, 61-614 Poznan, Poland;

    Faculty of Chemistry, Adam Mickiewicz University in Poznan, Umultowska 89b, 61-614 Poznan, Poland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Microporous materials; Chemical synthesis; Adsorption; Surface properties;

    机译：微孔材料;化学合成;吸附;表面特性;

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