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.

纳滤膜的优势在去除水中的痕量有机污染物（例如药品和个人护理产品（PPCP））方面是众所周知的。通过聚醚砜（PDA）和季铵壳聚糖（HTCC）的带相反电荷的聚电解质的逐层技术对聚醚砜（PES）超滤膜进行改性，制备了具有活性表层的双电荷聚电解质多层膜。使用表面形态，亲水性，表面电荷和分子量截留值研究了纳米复合膜的理化性质。记录了多巴胺，支持盐（NaCl）浓度和自组装层数的影响。优化后的膜的截留分子量约为935 Da，纯水渗透率为15.665L·m。^-2 ·h ^-1 ·MPa ^-1。结果还显示出在中性pH下的除盐能力，如K ₂ SO ₄  > Na ₂ SO ₄  > MgSO ₄  > NaCl> KCl> MgCl ₂。此外，最佳膜对阿替洛尔（ATE），卡马西平（CBZ）和布洛芬（IBU）的排斥率更高，分别为76.22％，87.29％和89.85％。此外，通过调节pH值，可以将ATE和CBZ的保留率提高至81.67％和92.50％，这表明改性膜的表面具有双电荷性质。