海藻酸钠/聚丙烯腈超滤膜的制备及性能  

Preparation and properties of sodium alginate/polyacrylonitrileultrafiltration membranes

作　　者：刘晓辉[1] 杨璇 闫弘津 LIU Xiao-hui;YANG Xuan;YAN Hong-jin(School of Material Science and Engineering,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学材料科学与工程学院,天津300387

出　　处：《天津工业大学学报》2023年第2期22-27,33,共7页Journal of Tiangong University

基　　金：国家自然科学基金资助项目(21975182);国家级“大学生创新创业训练计划项目”(201610058028)。

摘　　要：针对聚丙烯腈(PAN)超滤膜亲水性差和易污染的缺点,以含天然多糖的海藻酸钠(SA)和PAN为原料,采用涂覆法制备SA/PAN复合膜,通过离子交换,Ca^(2+)、Zn^(2+)、Mg^(2+)等二价金属离子与SA在PAN表面形成了交联网络结构。利用傅里叶红外光谱、扫描电镜、水接触角测试、静态抗蛋白吸附测试和热重分析等技术表征复合膜的结构与浸润性、抗污染性和热稳定性,研究金属离子和SA浓度对复合膜亲水性和抗污染性的影响规律。结果表明:SA(2%)-Ca^(2+)/PAN、SA(1%)-Zn^(2+)/PAN和SA(1%)-Mg^(2+)/PAN复合膜有较高的孔隙率,分别为51.80%、31.58%和32.80%;与纯PAN膜相比,Ca^(2+)-SA/PAN复合膜的水接触角由76.0°降至31.8°,静态蛋白质吸附量由66μg/cm^(2)降至6μg/cm^(2),说明SA的引入可以明显提高复合膜的亲水性和抗污染性;SA和金属离子的引入对PAN膜的热稳定性影响较小。Aiming at the shortcomings that polyacrylonitrile(PAN)ultrafiltration membrane is poorly hydrophilic and sus-ceptible to fouling,the SA/PAN composite membranes were prepared by coating method and using sodium alginate(SA)containing natural polysaccharide and PAN as raw materials.Through the ion exchange process,divalent metal ions such as Ca^(2+),Zn^(2+),Mg^(2+)and SA formed a cross-linked network structure on the PAN surface.The structures,infiltrations,anti-fouling properties and thermal stabilities of the composite membranes were tested by Fourier transform infrared spectroscopy,scanning electron microscope,water contact angle,static anti-protein adsorption and thermogravimetric analysis.The results indicated that SA(2%)-Ca^(2+)/PAN,SA(1%)-Zn^(2+)/PAN,SA(1%)-Mg^(2+)/PAN composite membranes have high porosity values of 51.80%,31.58%and 32.80%,respectively.Compared with untreated membranes,the water contact angle of Ca^(2+)-SA/PAN composite membrane decreased from 76.0°to 31.8°and the static protein adsorption of Ca^(2+)-SA/PAN composite membrane reduced from 66μg/cm^(2)to 6μg/cm^(2),which indicated that SA can improve the hydrophilicity and anti-fouling properties of the composite membranes.Meanwhile,the results of thermogravimetric analysis showed that the introduction of SA and metal ions had little effect on the thermal stability of the composite membranes.

关 键 词：海藻酸钠 聚丙烯腈 复合超滤膜 亲水性 抗污染性 热稳定性 

分 类 号：TQ028.8[化学工程]