Abstract:

The polyamide reverse osmosis (RO) membrane was modified with the quorum sensing inhibitor methyl anthranilate (MA), which was dissolved in an ethanol/aqueous solution. As an activating solvent, ethanol can dissolve polyamide oligomers and swell separation layer, thus improve membrane permeability. After solvent activation and grafting MA, the hydrophilicity of the modified membrane surface increased, the roughness decreased, the water flux was higher than that of the original membrane, and the rejection was maintained. Besides, the modified membrane had good performance stability and acidic-alkaline resistance stability. Escherichia coli was used as simulated bacteria in water to investigate anti-biofouling performance of the membranes. After 5 d of contact with the concentration of 10⁷ CFU/ml bacteria, the area on the surface of the membrane surface prepared by 10 g/L MA was only 0.27% of the original membrane. When bacterial suspension concentration reached 10⁹ CFU/ml, biofilm areas on the membranes surface prepared with MA of 5 g/L and 10 g/L were reduced to 0.79% and 0.66% compared to original membrane, respectively. The results demonstrated that introducing MA can inhibit bacterial proliferation. In addition, after soaking in Songhua River water containing nutrient solution for 2 d and 5 d, the rejection decline rates of the modified membrane were significantly lower than those of original membrane.

Key words: membrane, permeability, quorum sensing inhibitor, pollution, solvent activation

摘要：

利用乙醇/水溶液溶解群体感应抑制剂邻氨基苯甲酸甲酯（MA），通过化学接枝反应将MA引入到聚酰胺反渗透膜表面。乙醇作为活化溶剂可起溶解聚酰胺低聚体和溶胀分离层的作用，提高膜渗透性。联合溶剂活化和接枝MA后的改性膜表面亲水性提高，粗糙度降低，水通量高于原膜并保持高盐截留率，同时改性膜具有较好的性能稳定性和耐酸碱稳定性。以大肠杆菌作水体中模拟细菌，考察了膜的抗生物污染性能。与浓度为10⁷ CFU/ml的菌悬液充分接触5 d后，利用10 g/L MA制备的膜表面生物膜面积仅为原膜的0.27%；与浓度为10⁹ CFU/ml的菌悬液接触后，利用5 g/L和10 g/L MA制备的膜表面生物膜面积分别为原膜的0.79%和0.66%。MA的引入抑制了细菌在膜面的增殖。此外，在加入营养液的松花江水中浸泡2 d和5 d后，改性膜的盐截留率降低幅度明显低于原膜。

关键词: 膜, 渗透率, 群体感应抑制剂, 污染, 溶剂活化