通过聚多巴胺（PDA）涂覆作用对薄膜复合聚酰胺（TFC-PA）膜进行改性，以提高膜的防污性和选择性能。采用衰减全反射傅里叶变换红外光谱（ATR-FTIR）、扫描电子显微镜（SEM）、原子力显微镜（AFM）和接触角分析仪考察改性后膜表面结构、形貌和亲水性的变化，通过正渗透实验和结垢实验评估改性前后膜的渗透性和防污性。结果表明，改性后膜表面成功涂覆了均匀的聚多巴胺层，膜表面的亲水性增加；改性膜拥有较高的水渗透通量和较低的反向溶质通量。原始膜经过改性后选择性由（0.26±0.3）×10^-3变化至（0.09±0.2）×10^-3，膜的选择性变高。原始膜经过改性后结垢指数由12.26%降低到5.45%，改性膜显示出更好的防污性。

Thin-film composite polyamide (TFC-PA) membrane is modified through coating a surface layer of polydopamine (PDA) to improve its selectivity and antifouling property.Attenuated total reflectance Fourier transform infrared (ATR-FTIR), scanning electronic microscopy (SEM), atomic force microscopy (AFM) and contact angle analyzer are employed to study the changes in surface structure, morphology and hydrophilicity of the membrane after modification.The membrane's permeability and antifouling properties before and after the modification are evaluated through forward osmosis and scaling experiments.The results show that the surface of the modified membrane has successfully been coated with a uniform polydopamine layer, and the hydrophilicity of the membrane surface increases;the modified membrane exhibits higher water permeation flux and lower reverse solute flux.After the modification of original membrane, the selectivity (J_s/J_w) changes from (0.26±0.3)×10^-3 to (0.09±0.2)×10^-3.The smaller the value of J_s/J_w, the higher the selectivity of the membrane.Meanwhile, the fouling index drops from 12.26% to 5.45% due to modification, and the modified membrane shows better antifouling properties.

王通军(1995-),男,硕士研究生,研究方向为污水处理,1536837096@qq.com