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首页> 外文期刊>Separation and Purification Technology >Preparation and characterization of quaterinized chitosan/poly(acrylonitrile)composite nanofiltration membrane from anhydride mixture cross-linking
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Preparation and characterization of quaterinized chitosan/poly(acrylonitrile)composite nanofiltration membrane from anhydride mixture cross-linking

机译：酸酐混合物交联制备季铵化壳聚糖/聚丙烯腈复合纳滤膜及其表征

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摘要

A novel composite nanofiltration(NF)membranes were prepared using quaterinized chitosan as a selective layer,poly(acrylonitrile)UF membrane as a support layer and anhydride mixture as cross-linking reagent.The images of these membranes were characterized by scanning electron microscope,and the other characterizations such as pure water permeability,molecular weight cut-off,rejection and swelling were investigated.Molecular weight cut-offs tested were in the range of 550-580 Da(in NF range).Both pure water permeability and swelling in water decreased,whereas rejection increased with an increase in anhydride mixture concentration,indicating pore contraction and the increase in both hydropho-bicity and pore tortuosity due to cross-linking.Besides,the rejection declined with the increasing feed concentration,whereas it was not affected by feed cross-flow rate.The order of rejection to different salts followed the decreasing of CaCl2,MgCl2,NaCl,KC1,MgSO4,Na2SO4 and K2SO4,suggesting the positively charged characteristic of the NF membranes.And the rejections to MgCl2,CaCl2 solutions reached up to 0.95,so the membranes developed can be used for the hardness removal in water treatment process.
机译：以季铵化壳聚糖为选择层，以聚丙烯腈超滤膜为支撑层，以酸酐混合物为交联剂，制备了一种新型的复合纳滤膜。研究了纯水的渗透性，截留分子量，排斥和溶胀等其他特性。测试的截留分子量在550-580 Da（在NF范围内）。纯水的渗透性和在水中的溶胀降低，而拒收率则随着酸酐混合物浓度的增加而增加，这表明孔收缩以及由于交联引起的疏水性和孔隙曲度的增加。此外，拒收率随着进料浓度的增加而下降，但不受其影响进料错流率.CaCl2，MgCl2，NaCl，KCl，MgSO4，Na2SO4和K2SO4的减少依次是对不同盐类的排阻顺序，这表明NF膜具有带电特性。MgCl2，CaCl2溶液的截留率高达0.95，因此开发的膜可用于水处理过程中的硬度去除。

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