摘要
针对聚酰胺反渗透膜(RO)抗阳离子表面活性剂污染能力差的难点,提出改变反渗透膜表面荷电性方法,以聚乙烯亚胺(PEI)的乙醇溶液为电解质溶液,利用部分嵌入式静电自组装法对聚酰胺反渗透膜进行改性。采用场发射扫描电子显微镜(FE-SEM)、X射线光电子能谱(XPS)、接触角和固体表面Zeta电位对改性反渗透膜的结构和性能进行表征。结果表明,FE-SEM图像显示膜表面形态没有发生变化;XPS元素分峰和含量分析证明了PEI成功组装在反渗透膜上;接触角验证了改性后膜的亲水性增加,Zeta电位证实了改性后膜的荷负电性减小。改性后膜通量和脱盐性能均增加,抗污染性能得到显著改善,并具有耐酸碱稳定性(pH 2～11)。
In order to improve anti-cationic surfactant pollution performance of polyamide reverse osmosis(RO) membranes, a partially embedded electrostatic self-assembly method was used with polyethyleneimine (PEI)-ethanol solution as the polyelectrolyte solution to modified RO membrane surface. The RO membranes were characterized by field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), contact angle and solid surface Zeta potential. The FE-SEM results show that the surface morphology of the modified membranes is not changed. XPS elemental and content analysis prove that PEI is successfully assembled on membrane surface, while contact angle results verify that the modified membrane shows increased hydrophilicity. Furthermore, zeta potential results confirm the charge-negativity of the modified membrane decreases. The modified membranes have higher flux and salt rejection, better antifouling to cationic surfactants and good stability in acid and base conditions (pH2~11).
作者
王佳倩
王书浩
沈红梅
周勇
高从堦
WANG Jia-qian;WANG Shu-hao;SHEN Hong-mei;ZHOU Yong;GAO Cong-jie(The Ocean College,Zhejiang University of Technology,Hangzhou 310014,China)
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2019年第2期475-482,共8页
Journal of Chemical Engineering of Chinese Universities
基金
海岛水资源保障技术集成与示范(2016YFC0401508)
关键词
污染
膜
脱盐
静电自组装
聚乙烯亚胺
pollution
membranes
desalination
electrostatic self-assembly
polyethyleneimine
