共查询到5条相似文献,搜索用时 62 毫秒
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改变化学反应时间获取一系列荷电量不同的改性再生纤维素(RC)超滤膜,定量地考察了超滤膜上荷电量对膜的渗透性和牛血清蛋白(BSA)透过率的影响.研究结果表明:反电渗透现象造成荷电量不同的超滤膜上的水透过系数均减小,减小的程度与膜的荷电量和溶液离子强度有关;溶液pH值为7.0的条件下,荷负电的BSA与荷负电改性RC膜之间的静电相互作用,使BSA的透过率减小,减小的程度同样与膜的荷电量和溶液离子强度有关.研究结果提供了荷电量对超滤膜渗透性和BSA透过率影响的定量数据;揭示了相对于传统超滤膜而言,荷电超滤膜具有更好的渗透性和分离选择性相结合的优势. 相似文献
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静电相互作用对荷电超滤过程中带电小分子清除的影响 总被引:1,自引:0,他引:1
研究了不同荷电量小分子(分子量为1 kD左右)通过表面带同种电荷但荷电量不同的超滤膜(截留分子量为10 kD)时的行为.实验结果表明,荷电超滤膜对带电小分子的截留作用与超滤膜荷电量、小分子带电量以及溶液离子强度密切相关.低离子强度条件下,荷电超滤膜对高荷电小分子的截留率很高,这主要是静电相互作用的结果.随着离子强度的增加,静电屏蔽作用增强,荷电超滤膜对带电小分子的截留作用也相应减小.结果还表明,表观透过率的实验值与基于滞膜模型的理论计算值有较好的吻合. 相似文献
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Shamshad Khan Yang Mengling Yang Yang He Haiyan Jiang Hao 《Fullerenes, Nanotubes and Carbon Nanostructures》2018,26(3):158-167
In this study, removal of Ni and Cu ions from aqueous media was assessed by the adsorption of Al2O3 nanoparticles (ANPs), with surface modification by natural organic matter (NOM). The obtained materials (NOM–ANPs) were characterized by Fourier transform infrared spectroscopy. Then, batch adsorption methods were carried out as a function of contact time, adsorbate concentration, pH and temperature. Kinetic experiments revealed that the pseudo-second-order model exhibited the best correlation with the adsorption data, the estimated maximum adsorption capacity of Ni and Cu could reach 15.38 and 62.50 mg g?1 respectively at 303 K, displaying higher efficiency for Ni and Cu removal than previously reported adsorbent materials reported in the literature. Thermodynamic studies exposed the feasibility and endothermic nature of the system. The experimental results show the technical feasibility of NOM–ANPs, its easy synthesis, economic and a promising advanced adsorbent in environmental pollution cleanup. 相似文献