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采用挤压成型和流铸法制备了ZrO2/堇青石微滤膜,并通过错流方式下的流动电势测量对所制备微滤膜的表面荷电性能进行了表征。研究了过滤介质溶液的pH值、电解质种类和浓度等对膜的表面荷电性能和渗透通量的影响。结果表明:膜流动电势大小取决于过滤溶液的pH值、电解质种类和浓度。溶液浓度为10-3mol/L时,膜等电点随着电解质种类改变而在4.2和5.4之间变化。膜的流动电势随NaCl溶液浓度提高而逐渐减小,但等电点不变;而CaCl2和Na2SO4溶液中的Ca2+和SO42-在膜孔表面存在特定吸附,导致膜的等电点和表面净电荷符号改变。制备的ZrO2/堇青石微滤膜在等电点附近出现最大离子溶液过滤通量。
Abstract：Zirconia/cordierite microfiltration membrane was prepared by extrusion in combination with slip casting.The electroki-netic properties of the as-prepared membrane were characterized by the streaming potential measurements in tangential microfiltration mode.The influences of pH value,electrolyte species and concentrations of filtered solutions on the electrokinetic properties and permeate flux were investigated.The results show that the streaming potentials are dependent on the pH value,the type of electrolyte and the concentration of the filtered solution.The isoelectric point(IEP) of the membranes rose from 4.2 to 5.4 for different types of electrolyte solutions with a concentration of 10-3 mol/L.The streaming potential of membrane increases gradually with the increase of ionic concentration of NaCl solution,and this causes the streaming potential to tend to be zero at high salt concentrations.However,the IEP of the membrane does not change.The specific adsorption of Ca2+ and SO42-ions in CaCl2 and Na2SO4 solutions onto the pore wall of the membrane surface can alter the IEP and the net charge sign of the membrane surface.The as-prepared zirconia /cor-dierite membrane shows a maximal permeate volume flux near the IEP.
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基本信息:
中图分类号:O614.412
引用信息:
[1]周健儿,汪永清,张小珍,等.ZrO_2/堇青石微滤膜表面荷电性能及其对膜通量的影响(英文)[J].硅酸盐学报,2009,37(02):299-303.
基金信息:
国际科技合作(2005DFA50450)资助项目
2009-02-15
2009-02-15