γ-Al2O3膜对单组分无机盐溶液的截留性能  

Retention of single component inorganic salt solution with mesoporous γ-Al_2O_3 membrane

作　　者：漆虹[1] 韩静[1] 江晓骆[1] 柳永新[1] 范益群[1] 邢卫红[1] 

机构地区：[1]材料化学工程国家重点实验室,南京工业大学膜科学技术研究所,南京210009

出　　处：《膜科学与技术》2010年第5期28-31,42,共5页Membrane Science and Technology

基　　金：国家重点基础研究发展计划(2009CB623400);国家自然科学基金青年基金(20906047);化学工程联合国家重点实验室开放课题资助项目(SKL-ChE-09A01)

摘　　要：采用孔径约为3 nm的γ-Al2O3中孔膜,在pH 4-10,压力0.4-1.0 MPa,对浓度范围为0.005-0.1 mol/L的四种单组份无机盐溶液（NaCl、CaCl2、Na2SO4和MgCl2）进行截留性能考察.研究结果表明：膜对离子截留率的大小取决于离子所带的电荷大小.按从大到小的顺序：MgCl2〉CaCl2〉NaCl〉Na2SO4,膜的截留率逐渐降低.膜对离子的截留率随盐溶液浓度的增大而降低,随操作压力的升高而增大.在pH=5,压力为0.5 MPa,浓度为0.003 mol/L时,膜对Mg2＋和Ca2＋的截留率分别达到85%和87.4%.有希望用于水的软化过程.The retention properties of γ-Al2O3 mesoporous membrane（with a pore size of around 3 nm） with respect to the salt solutions,namely NaCl,CaCl2,Na2SO4 and MgCl2,were investigated under the pH value 4~10,pressure 0.4~1.0 MPa and concentration 0.005~0.1 mol/L.The results show that the retention properties of γ-Al2O3 membrane with respect to the salt solutions depend on the charges of the ion.The membrane exhibits a decreasing retention rate in the sequence as follows： MgCl2CaCl2NaClNa2SO4.The concentration dependence of the retention of the membrane shows that the retention rate decreases with increaing of the salt concentration and increases with the pressure-enhancing.Under the condition of pH value of 5 and a pressure 0.5 MPa,the retention rates for the MgCl2 and CaCl2 are 85% and 87.4%,respectively.

关 键 词：多孔陶瓷膜 γ-Al2O3中孔膜 无机盐溶液 离子截留 

分 类 号：TQ028.8[化学工程]