摘要复合纳滤膜是介于反渗透和超滤膜之间的一种压力驱动膜。由于复合膜纳滤膜是由 超薄皮层和具有非对称结构的支撑层构成的，所以在低压下具有高的选择性及渗透性， 因此，日益受到人们的重视。73778

本工作以聚醚砜作复合纳滤膜的基膜，以均苯三甲酰氯（TMC）和 4,4’-二氨基-2,2’- 二磺酸基-联苯（BDSA）分别作为两相活性单体，通过界面聚合手段在基膜表面涂覆超 薄脱盐层，制备复合纳滤膜（TFC）。通过全反射红外光谱(ATR-FTIR)、扫面显微镜(SEM) 等表征手段，分析了复合纳滤膜的表面结构，观察复合膜的表面形态及断面结构，实验 中，对制得的聚酰胺复合纳滤膜的脱盐率和水通量等性能进行了测试。分别考察了水相 中胺单体浓度、有机相单体浓度、后处理时间等条件对聚酰胺复合纳滤膜分离性能的影 响。

本文研究表明，对膜的水处理性能实验结果表明，在 BDSA 浓度为 2。00 wt%时，TFC 对 Na2SO4、MgSO4、NaCl 和 MgCl2 四种盐溶液的截留率分别为 97。1%、74。2%、67。3%和 45。5%；同时对刚果红和亚甲基蓝两种有机小分子染料的截留率也都高于 99%，证实了膜 表面荷负电，并可用于工业废水的纯化与有机染料的去除。

毕业论文关键词 界面聚合 复合纳滤膜 聚酰胺

Title Preparation of the Charge-Aggregate Induced  Nanofiltration Membrane with High Performance via 2,2’-Benzidinedisulfonic Acid and Trimesoyl Chloride。

Abstract Nanofiltration (NF) is a relatively new pressure-driven membrane separation technology with efficiency in between that of ultrafiltration and reverse osmosis。 Due to its low pressure operation, mild working conditions and adaptability to different applications, the NF process has been gradually adopted in several research areas including water softening, organic pollutants recovery and heavy metal removal。 Novel high-flux thin film composite (TFC) NF membranes were fabricated via interfacial polymerization (IP) on a polysulfone substrate using 2,2’-benzidinedisulfonic acid (BDSA) as the amine monomer in aqueous solution and trimesoyl chloride (TMC) as the organic monomer in n-hexane。

The optimized membrane TFC-1。0 showed excellent rejection towards different inorganic electrolyte solutions in the following order: Na2SO4 > MgSO4> NaCl > MgCl2, indicating the negatively charged nature of the membrane。 Surface properties were evaluated by Fourier-transform infrared (FT-IR), field emission scanning electron microscopy (FE-SEM), and contact angle measurements, and the results indicated a smooth and moderately hydrophobic surface。

What’s more, the rejection for two organic dyes solution, Congo red and Methylene blue was also higher than 99%, which is expected in the application of industrial wastewater treatment。

Keywords    Interfacial Polymerization    polyamide    Thin Film Composite

目 次

1 引言 1

1。1 纳滤膜介绍 1

1。2 界面聚合法制备纳滤膜 3

1。3 本课题研究意义及研究内容 4

2 实验部分 6

2。1 实验材料 6

2。2 实验设备 6

2。3 复合纳滤膜（TFC）的制备方法 7

2。4 TFC 分离性能 7

2。5 TFC 性能表征方法