本文以壳聚糖（CTS）的接枝共聚物 2-羟丙基三甲基氯化铵壳聚糖（HTCC）为聚电 解质阳离子，聚丙烯酸（PAA）为聚电解质阴离子，以环氧氯丙烷（ECH）为交联溶剂， 利用静电-交联协同作用，在聚醚砜(PES)基膜上运用层层自组装技术制备荷正电的 (HTCC/PAA)nHTCC 复合纳滤膜。73777

对复合纳滤膜的纯水渗透性能、截留分子量、荷电性进行了探讨，改变铸膜液 PAA 的浓度及酸碱条件、无机盐种类及浓度、PPCPs 种类等因素对膜的分离性能和机理进行 了研究。最佳制膜条件是：HTCC 浓度为 5。0 g/L，PAA 浓度为 1。0 g/L（调节 pH=6~8）， 加入 0。05 g/LNaCl，制备 4。5 个双层，ECH 浓度 2%，交联 21 h。(HTCC/PAA)4HTCC 的 纯水渗透系数为 18。39 L·m-2·h-1，截留分子量是 1508 Da，对无机盐的截留高低顺序为： MgCl2＞NaCl＞KCl＞Na2S04＞K2S04，对 4 种 PPCPs 的去除率高低顺序为：马来酸氨氯 地平＞阿替洛尔＞马西平＞布洛芬。

毕业论文关键词 HTCC 层层自组装 复合纳滤膜 分离性能

毕 业 设 计 说 明 书 外 文 摘 要

Title Study on the sepration performance of lbl self-assembly Of chitosan composite menmbrane

Abstract A positively charged (HTCC/PAA)nHTCC composite nanofiltration membrane was prepared by using 2-Hydroxypropyltrimethyl ammonium chloride chitosan(HTCC) as cationic polyelectrolyte,Polyacrylic Acid(PAA) as anionic polyelectrolyte,epichlorohydrin(ECH) as cross-linking reagent and alternate deposited on ultrafiltration(PES) membrane by electrostatic-crosslinking synergism。The pure water permeability,molecular-weight cut-off(MWCO),electric charge of (HTCC/PAA)nHTCC membrane were tested。The performance and mechanism of membrane separation were studied by changing the concentration of casting solution PAA,pH condition of PAA, inorganic salt types and concentration and PPCPs types。 The results indicated that the (HTCC/PAA)nHTCC membrane from 5 g/L HTCC casting solution, 1。0 g/L PAA casting solution(regulation pH=6～8),0。005g/L NaCl as a supporting salt, 4。5 bilayers, cross-linked 21 h,then the membrane had optimum performance。The pure water permeability of the (HTCC/PAA)4HTCC composite membrane is 18。39 L·m-2·h-1·MPa-1, its MWCO is about 1508 (in nanofiltration range)。The rejection of salt solutions follows the decreasing orde of MgCl2, NaCl, KCl, Na2SO4, K2SO4,revealing the positively charged characteristic of the membrane。The rejection of PPCPs follows the decreasing order of Amlodipine Maleate,Atenolol,Carbamazepine, Ibuprofen。

Keywords HTCC layer-by-layer self-assembly composite nanofiltration membrane separation performanc

本科毕业设计说明书 第 Ⅰ 页

目 次

1 绪论 1

1。1 前言 1

1。2 PPCPs 去除技术 1

1。3 海水淡化技术 2

1。4 纳滤膜 3

1。5 论文研究意义及研究内容 5

2 实验部分 7