A dually charged nanofiltration membrane by pH-responsive polydopamine for pharmaceuticals and personal care products removal

纳滤 化学 聚电解质 超滤(肾) 药品和个人护理产品的环境影响 化学工程 色谱法 壳聚糖 表面电荷 有机化学 聚合物 流出物 环境工程 物理化学 工程类 生物化学
作者
Zhiyu Ouyang,Zhonghua Huang,Xinyuan Tang,Caihua Xiong,Mengdi Tang,Yuting Lu
出处
期刊:Separation and Purification Technology [Elsevier BV]
卷期号:211: 90-97 被引量:84
标识
DOI:10.1016/j.seppur.2018.09.059
摘要

Advantages of nanofiltration membranes are well-known in removal of trace organic pollutants such as pharmaceuticals and personal care products (PPCPs) in water. A dually charged polyelectrolyte multilayer membrane with an active skin layer was prepared by the modification of polyethersulfone (PES) ultrafiltration membrane through the layer-by-layer technique of oppositely charged polyelectrolytes of polydopamine (PDA) and quaternate chitosan (HTCC). The physicochemical properties of the nanocomposite membrane were investigated using surface morphology, hydrophilicity, surface charge and molecular weight cut off. The influence of dopamine, support salt (NaCl) concentration and self-assembled layers number was documented. The optimized membrane had a molecular weight cut off of about 935 Da and possessed a pure water permeability of 15.665L·m−2·h−1·MPa−1. The results also exhibited salt rejection ability as K2SO4 > Na2SO4 > MgSO4 > NaCl > KCl > MgCl2 at neutral pH. In addition, the optimum membrane had higher rejection to atenolol (ATE), carbamazepine (CBZ) and ibuprofen (IBU) at 76.22%, 87.29% and 89.85%, respectively. Moreover, the retention of ATE and CBZ could be increased to 81.67% and 92.50% via adjusting pH, demonstrating that the surface of modified membrane had dually charged properties.
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