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Effects of inorganic electrolytes on zeta potentials of ceramic microfiltration membranes

机译：无机电解质对陶瓷微滤膜ζ电势的影响

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摘要

The characterization of surface electrical properties of membrane materials is critical for understanding and predicting filtration performances of membranes.In this paper,electrical properties of alumina-based ceramic microfiltration membrane were studied.Zeta potential of the membranes itself is determined using electro-osmosis measurements in the presence of various electrolytes,including NaCl,NH_4C1,CaCl_2,FeCl2,A1C13,Na2SO_4,Na_2S,Na_3PO_4 FeSO_4 and Al_2(SO_4)_3,which are commonly encountered in inorganic salt industry.The zeta potential is obtained over a wide range of pH values(2-12)at ionic strengths of 0.01 M.The zeta potential decreases with increase of ionic strength in the NaCl solution and isoelectric point(IEP)shows little dependence on the ionic strength indicating the absence of a specific adsorption of Cl~-and Na~+ ions.The shifting of the IEP of the membrane to a higher pH value in FeCl_2,CaCl_2 and AlCl_3 solutions shows specific adsorption of the cations,and specific adsorption of the S~(2-),SO_4~(2-),PO_4~(3-)ions shifts the IEP to a lower pH value.The zeta potential in FeSO_4 and Al_2(SO_4)3 solutions were very low,indicating a decrease of charge density on the membrane surface due to the complex co-adsorption of the cations and the anions on the membrane surface.
机译：膜材料表面电特性的表征对于理解和预测膜的过滤性能至关重要。本文研究了氧化铝基陶瓷微滤膜的电性能。利用电渗法测定膜本身的ζ电势。无机盐行业中常见的各种电解质的存在，包括NaCl，NH_4Cl，CaCl_2，FeCl2，AlCl3，Na2SO_4，Na_2S，Na_3PO_4 FeSO_4和Al_2（SO_4）_3.zeta电位在宽pH范围内获得离子强度为0.01 M时的值（2-12）.NaCl溶液中zeta电位随离子强度的增加而降低，等电点（IEP）对离子强度的依赖性很小，表明不存在特定的Cl〜-吸附在FeCl_2，CaCl_2和AlCl_3溶液中，膜的IEP迁移到较高的pH值时，显示出阳离子的特异性吸附，以及特定的离子对S〜（2-），SO_4〜（2-），PO_4〜（3-）离子的吸附将IEP移至较低的pH值.FeSO_4和Al_2（SO_4）3溶液中的Zeta电位非常低，这表明由于阳离子和阴离子在膜表面上的复杂共吸附，使膜表面上的电荷密度降低。

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