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采用溶胶-凝胶法制备了g-Al2O3纳滤膜. N2吸脱附测试结果表明, 膜的特性参数为: BJH脱附平均孔径3.9 nm, BJH脱附累积孔容0.33 cm3/g, BET比表面积245 m2/g, 孔径分布非常窄. 测定了g-Al2O3纳滤膜的Ca2+截留率-跨膜压差、Ca2+截留率-处理液浓度、Ca2+截留率-处理液pH值等工作曲线, 发现Ca2+截留率随跨膜压差的升高而增加, 随处理液中CaCl2浓度的升高而降低; Ca2+截留率强烈地依赖于溶液的pH值, 在Al2O3的等电点(pH = 7.5)其值最小.
G-Al2O3 nanofiltration membrane was prepared by sol-gel method.The results of N2 adsorption-desorption test showed that the characteristic parameters of the membrane were as follows: the average pore diameter of BJH desorption was 3.9 nm, the cumulative pore volume of BJH desorption was 0.33 cm3 / g, the BET Surface area of 245 m2 / g, the pore size distribution is very narrow.It was found that the Ca2 + rejection of transgranular pressure drop, Ca2 + rejection rate - treatment solution concentration, Ca2 + rejection rate - The Ca2 + rejection increased with the increase of transmembrane pressure, and decreased with the increase of CaCl2 concentration in the treatment solution. The Ca2 + rejection was strongly dependent on the pH value of the solution. At the isoelectric point (pH = 7.5) of Al2O3 The minimum value.