一种新型共混复合纳滤膜的制备及性能研究  

Preparation and Characterization of a Novel Composite Nanofiltration Membrane Prepared with ALG and CMC Blends

作　　者：高复生[1] 高从堦[1] 高学理[1] 王志宁[1] 王剑[1] 都娟成 

机构地区：[1]中国海洋大学化学化工学院海洋化学理论与工程技术教育部重点实验室,山东青岛266100

出　　处：《高校化学工程学报》2014年第3期671-675,共5页Journal of Chemical Engineering of Chinese Universities

基　　金：国家重点基础研究发展规划(973)项目(2009CB623402);国家自然科学基金项目(21006100)

摘　　要：以海藻酸钠(ALG)和羧甲基纤维素钠(CMC)共混液为活性层铸膜液,聚砜(PSF)超滤膜为基膜,环氧氯丙烷(ECH)的乙醇溶液为交联剂,采用涂敷和交联的方法制得一种新型复合纳滤膜,利用红外光谱仪、扫描电子显微镜、原子力显微镜和接触角测量仪等检测手段对复合膜进行了结构和性能的表征。结果表明,在1.0 MPa压力和30 L?h-1料液流量操作条件下,该复合纳滤膜对1000 mg?L-1 Na2SO4溶液的截留率为97.1%,通量17.3 L?m-2?h-1。以ALG和CMC共混液制备的复合纳滤膜比单一材料膜有更致密的膜面结构,截留率更高。该纳滤膜对不同无机盐的截留性能不同,表现出荷负电膜截留性能,这主要决定于荷电膜与电解质离子之间的静电作用力。A novel negatively charged composite nanofiltration （NF） membrane was prepared by coating polysulfone （PSF） ultrafiltration （UF） membrane with sodium alginate （ALG） and sodium carboxymethyl cellulose （CMC） mixed solutions, and was subsequently cross-linked with epichlorohydrin （ECH）. The structure and properties of the membrane were investigated by FT-IR, Scanning Electron Microscopy （SEM）, Atomic Force Microscopy （AFM） and contact angle studies. At 1.0 MPa and 30 L·h-1, the rejection and flux of the NF membrane for 1000 mg·L-1 Na2SO4 are 97.1%and 17.3 L·m-2·h-1, respectively. The composite NF membrane prepared from ALG and CMC blends has tighter surface, which has higher rejection ratio than ALG or CMC membranes. The results also indicate that the composite NF membrane has different rejection ratio to different inorganic salts. Similar to other negatively charged membranes, the rejection performance of the composite membrane was depends on the electrostatic force between the charged membrane and ions of electrolytes.

关 键 词：复合纳滤膜 海藻酸钠 羧甲基纤维素钠 环氧氯丙烷 SODIUM ALGINATE (ALG) SODIUM CARBOXYMETHYL cellulose (CMC) EPICHLOROHYDRIN (ECH) 

分 类 号：O648.22[理学—物理化学] TQ051.893[理学—化学]