PPy/SMANa/PES导电复合膜的制备及其抗污性能

Preparation and properties of PPy/SMANa/PES conductive composite membranes

摘要:

为改善聚醚砜（PES）膜的抗污性能，以苯乙烯-马来酸酐钠共聚物（SMANa）为添加剂，采用非溶剂诱导相分离法（NIPS）制备了SMANa/PES膜。然后采用气相聚合法，FeCl3作为氧化剂，在SMANa/PES膜上制备导电聚吡咯（PPy）层。通过研究不同氧化剂浓度，聚合时间和温度制备的聚吡咯层对膜性能的影响，制备了系列PPy/SMANa/PES导电复合膜。采用FTIR、SEM和接触角测试仪表征其结构和形貌，采用超滤法对其水通量和抗污性能进行测试。结果表明，当聚合温度在30 ℃，FeCl3浓度为0.8 mol/L，聚合时间为5 min时，制备的PPy/SMANa/PES导电复合膜表现出最佳的抗污性能，在0.1 MPa的过滤压力下，其纯水通量高达409.58 L/(m2·h)，为SMANa/PES膜的83.75%，超声冲洗后的通量恢复率（FRR）达到86.57%，相比SMANa/PES膜提高了16.57%。

Abstract:

In order to improve the antifouling performance of Polyethersulfone (PES) membrane, SMANa/PES membranes were prepared by non-solvent induced phase separation (NIPS) method with the styrene maleic anhydride copolymer (SMANa) as additives. Afterwards, Polypyrrole (PPy) conductive layer was fabricated on SMANa/PES membranes by in situ chemical polymerization from the vapor phase with FeCl3 as the oxidant. A series of PPy/SMANa/PES conductive composite membranes were prepared by systemically investigated the oxidant concentration, time and temperature of polymerization on the performance of the membrane. The PPy/SMANa/PES conductive composite membranes obtained were characterized by FTIR, SEM and contact angle tester for structure and morphology analyses, and evaluated for water flux and antifouling performance in ultrafiltration. The results showed that, under the temperature of 30 ℃, with the concentration of FeCl3 is 0.8 mol/L, and time of polymerization is 5min, the resulting membrane had an outstanding water flux of 409 L/(m2·h) with pressure of 0.1 MPa, which is 83.75% percent of SMANa/PES membranes. After ultrasonic?irrigation, the flux recovery ratio (FRR) of the resulting membrane reach up to 86.57%, improved by 16.57% compared with SMANa/PES membranes.