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Yue Sun Ai-min Li Zheng-hao Fei Quan-xing Zhang Shi-he Wang 《高分子科学》2007,(6):621-627
A macroporous polymeric adsorbent NG-8 was synthesized with divinylbenzene using conventional suspension polymerization technique.Its aminated product NG-9 was prepared by introducing tertiary amino groups into NG-8 for removal of tannin acid from aqueous solutions.NG-9 could be used directly without a wetting process and had higher adsorption capacity than NG-8,which might be attributed to the enhanced adsorbent-adsorbate interaction due to the tertiary amino groups on the polymeric matrix.The Langmuir equation was successfully employed to describe the adsorption process.The adsorption enthalpy change further validated the uptake of tannin acid on NG-9 to be an enhanced physical adsorption because of the Lewis acid-base interaction.In addition,adsorption kinetic studies testified that the tertiary amino groups on the polymer matrix could decrease the adsorption rate maybe for the hindrance of the tertiary amino groups and water clusters built up. 相似文献
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从枯委陵菜(potenjtilla viscosa J.Don)根中分离出七个鞣质成分, 经波谱分析, 化学降解和衍生物制备等手段确定了它们的化学结构, 分别为(+)-儿茶素(1), (+)-儿茶素3-O-β-D葡萄糖苷(2), afzelechin-(4α-8)-儿茶素(3), 原花色苷元B-3(4), 原花色苷元B-33'-O-β-D-葡萄吡喃糖苷(5), 原花色苷元C-2(6)和枯委陵菜素(potentillanin)(7), 其中5和7是首次发现的天然化合物,化合物1及2具有保肝作用。 相似文献
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