【摘要】 采用K₂S₂O₈氧化聚砜膜产生活性羟基,通过接枝-交联法将N,N-二甲基N-（2-甲基丙烯酰胺乙基）N-（3-磺丙基）铵（MPDSAH）和丙烯酰胺（AAm）聚合交联到膜表面,制备两性离子复合纳滤膜.利用ATR/FTIR、XPS、SEM和接触角测定仪对膜进行表征,并考察接枝改性溶液中MPDSAH和AAm不同比例对膜渗透分离性能和抗污染性能的影响.结果表明,经过化学接枝交联,可在聚砜膜表面形成新的分离层,而且随着接枝单体MPDSAH含量的增加,两性离子复合纳滤膜的表面亲水性和截留能力逐渐增强,但膜通量先增加后降低;两性离子复合纳滤膜对不同无机盐的截留顺序为Na₂SO₄>MgSO₄>NaCl>MgCl₂;聚砜膜表面的接枝改性层稳定性好,使用过程中不易脱落.更多还原

【Abstract】 Polysulfone membrane was oxidized by potassium persulfate to produce active hydroxyl groups. The zwitterionic nanofiltration membrane was prepared by grafting and crosslinking the MPDSAH and AAm to the membrane surface. The changes of the membrane surface before and after modification were characterized by ATR/FTIR, XPS, SEM and Contact angle measurement. The effects of different proportions of MPDSAH and AAm in grafted solution on the permeation separation performance and antifouling performance of the membrane were investigated. The results showed that a new separation layer could be formed on the surface of the polysulfone membrane through chemical grafting and crosslinking. The surface hydrophilicity and rejection rate of the zwitterionic nanofiltration membrane gradually increased with the concentration of grafted monomer MPDSAH, but the flux firstly increased then decreased. The rejection order of different inorganic salts by the zwitterionic nanofiltration membrane was Na₂SO₄>MgSO₄>NaCl>MgCl₂. The grafted layer on the surface of the polysulfone membrane was stable and not easy to fall off during use.更多还原