Abstract

Nanofiltration membrane (NFM) is an effective and advanced semi-permeable membrane (pore size: 1 ~ 2 nm) for deep purification of drinking water due to their low operating pressure and high divalent salt ion rejection. In this work, a stable cellulose-based polyamide nanofiltration membrane (NF-PDA-RCM) with a unique three-layered structure was prepared for advanced treatment of drinking water, via the method of chemical bond connection followed by the interfacial polymerization strategy. The regenerated cellulose membrane (RCM), as the supporting layer of NFM, prepared by phase inversion method has good physical compatibility and abundant porous channels. Further, the flux of NFM can be controlled by adjusting the pore size of the RCM. Through Michael addition reaction, the supporting layer and the active layer of NF-PDA-RCM are connected by the covalent bonds, resulting in a great improvement in the stability of NF-PDA-RCM. The resultant NF-PDA-RCM has increased rejection rate of MgSO₄ (enhanced about 9.3%) and water-flux (enhanced about 78.5%) compared with that of no polydopamine (PDA) modified NFM. The RCM are completely biodegradable, allowing the NF-PDA-RCM to be a promising candidate for treating drinking water.

Graphic abstract

中文翻译：

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具有稳定的三层结构的纤维素基纳滤膜，用于处理饮用水

摘要

纳滤膜（NFM）是一种有效且先进的半透膜（孔径：1〜2 nm），由于其低的工作压力和高的二价盐离子截留率，可用于饮用水的深层净化。在这项工作中，通过化学键连接和随后的界面聚合策略，制备了具有独特三层结构的稳定的纤维素基聚酰胺纳米过滤膜（NF-PDA-RCM），用于饮用水的深度处理。通过相转化法制备的再生纤维素膜（RCM）作为NFM的支撑层，具有良好的物理相容性和丰富的多孔通道。此外，可以通过调节RCM的孔径来控制NFM的通量。通过迈克尔加成反应，NF-PDA-RCM的支撑层和活性层之间通过共价键相连，大大提高了NF-PDA-RCM的稳定性。所得的NF-PDA-RCM具有增加的MgSO排斥率与未使用聚多巴胺（PDA）改性的NFM相比，它具有_4种（增强了约9.3％）和水通量（增强了约78.5％）。RCM完全可生物降解，从而使NF-PDA-RCM成为处理饮用水的有前途的候选者。

图形摘要