Abstract:

Using CPVC (chlorinated polyvinyl chloride) ultrafiltration membrane as the base membrane, after co-deposition of TA (tannic acid) and PIP (piperazine) on the surface of the CPVC membrane, interfacial polymerization is carried out with the crosslinking agent TMC (trimesoyl chloride) to obtain a PA/TA/CPVC composite nanofiltration membrane, the PA/TA/CPVC composite nanofiltration membrane was characterized by SEM, AFM, FTIR and contact angle, the effects of drying time, TA/PIP concentration ratio, TA+PIP total concentration, and TMC concentration on the microstructure and performance of PA/TA/CPVC composite nanofiltration membranes were discussed. The research results show that the best TA/PIP concentration ratio is 7/3, the best drying time of the TA/PIP layer is 20min, and the pure water flux of the PA/TA/CPVC composite nanofiltration membrane increases with the increase of TA+PIP total concentration and the concentration of TMC The rejection rate of PEG1000 is above 90%. The maximum pure water flux of PA/TA/CPVC composite nanofiltration membrane is 4.5 L/(m² · h · bar), and the rejection rate of PEG1000 reaches 95.8%. The maximum flux to the simulated RB5 dye wastewater is 4.3 L/(m² · h · bar), and the rejection rate of RB5 at this time is 95.4%, which shows good stability to the simulated RB5 dye wastewater.

Key words: CPVC composite nanofiltration membrane, TA/PIP, co-deposition and interfacial polymerization combined method, simulated RB5 dye wastewater

摘要：

以氯化聚氯乙烯（CPVC）超滤膜为基膜，采用单宁酸（TA）和哌嗪（PIP）在CPVC膜表面共沉积后与交联剂均苯三甲酰氯（TMC）进行界面聚合得到PA/TA/CPVC复合纳滤膜，采用扫描电镜（SEM）、原子力显微镜（AFM）、红外光谱及接触角对PA/TA/CPVC复合纳滤膜进行了表征，并探讨了干燥时间、TA/PIP浓度比、TA+PIP总浓度、TMC浓度对PA/TA/CPVC复合纳滤膜微观结构与性能的影响。结果表明，TA/PIP浓度比最佳为7/3，TA/PIP层的最佳干燥时间为20min，PA/TA/CPVC复合纳滤膜的纯水通量随着TA+PIP总浓度的增加和TMC浓度的增加而减少，对PEG1000的截留率均在90%以上。PA/TA/CPVC复合纳滤膜纯水通量最大值为4.5L/(m² · h · bar)，此时PEG1000的截留率达到95.8%。对模拟RB5染料废水的最大通量为4.3L/(m² · h · bar)，此时RB5的截留率为95.4%，对模拟RB5染料废水的稳定性较好。

关键词: 氯化聚氯乙烯复合纳滤膜, 单宁酸/哌嗪, 共沉积和界面聚合组合法, 模拟RB5染料废水