膜科学与技术

层层自组装法改性再生废旧反渗透膜

作者：崔俊博，陈英波，张圆圆

单位：天津工业大学材料科学与工程学院省部共建分离膜与膜过程国家重点实验室，天津300387

关键词：废旧反渗透膜；聚酰胺；再生；层层自组装；纳滤膜

出版年,卷(期):页码： 2023,43(4):44-53

摘要：

针对废弃反渗透膜（RO）引起的环境污染问题，我们提出用氧化剂清洗去除废弃RO膜表面的污染物及聚酰胺层，然后用层层自组装（LbL）法把氧化清洗后的废弃膜转化再生为纳滤（NF）膜。研究了层层自组装过程的的制备参数对NF膜分离性能的影响。结果表明，以再生超滤（UF）膜为基膜，当聚电解质溶液中NaCl的浓度为0.25 g/L，阳/阴离子聚电解质的浓度均为0.5 g/L，沉积时间为20/10分钟时，4.0层的LbL NF膜R-A4性能最佳，纯水渗透率可达55 L/(m2·h·MPa)，对二价无机盐Na2SO4和MgSO4的截留率分别为98.5%和98.1%，而且还具有良好的工作稳定性。

To solve the problem of environmental pollution caused by waste reverse osmosis (RO) membranes, we proposed to remove the pollutants and polyamide layer on the surface of the waste RO membranes by using oxidant cleaning, and then use layer-by-layer self-assembly (LbL) method to convert and regenerate the waste membranes after oxidation cleaning into nanofiltration (NF) membranes. The effect of preparation parameters in the layer-by-layer self-assembly process on the separation performance of NF membrane was studied. The results showed that the LbL NF membrane R-A4 with 4.0 layers had the best performance when the regenerated ultrafiltration (UF) membrane was used as the basement membrane, the concentration of NaCl in the polyelectrolyte solution was 0.25 g/L, the concentration of cationic/anionic polyelectrolyte was 0.5 g/L, and the deposition time was 20/10 minutes. The pure water permeability of R-A4 was 55 L/(m2·h·MPa), and the rejection rates of divalent inorganic salts Na2SO4 and MgSO4 were 98.5% and 98.1% respectively. It showed excellent long-term working stability.

崔俊博（1994-），女，河南周口市人，硕士研究生，研究方向为废旧反渗透膜的回收再利用

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