摘要本文以 HTCC(2-羟丙基三甲基氯化铵壳聚糖)作为聚电解质阳离子层，以 PAA(聚丙 烯酸)作为聚电解质阴离子层，在 PES(聚醚砜)超滤膜制成的基膜上通过层层自组装交替 沉积的方法，制备了荷正电的(HTCC/PAA)nHTCC 纳滤膜，并在此基础上采用光还原技术 在复合膜表面负载纳米银颗粒以提高其抗污染性能。本文采用 FTIR(傅里叶红外光谱)、 接触角、XRD (X 射线衍射)等进行了表征。此外本文通过研究 PAA 浓度、pH 等对膜截留 性能的影响，确定了最佳制膜条件，探讨了截留分子量、荷电性、亲水性，并对该复合 膜的抗菌性能进行了评价。78380

(HTCC/PAA)nHTCC 复合纳滤膜的最佳制备条件为：HTCC 铸膜液浓度为 5。0 g/L， PAA 铸膜液浓度为 1。0g/L，加入 0。05 g/L 的 NaCl 作支撑盐，制备(HTCC/PAA)4HTCC， 交联剂 ECH(环氧氯丙烷)的体积分数为 1。2%，交联时间为 21 h。该复合纳滤膜的截留分 子量为 1508，对无机盐溶液的截留顺序为 MgCl2>NaCl>KCl>Na2SO4>K2SO4，结果也反 映了复合纳滤膜荷有正电。(HTCC/PAA)4HTCC-Ag 复合纳滤膜对实验中所用的不同细菌 的抑制作用顺序为：E。coli Rosetta>Bacillus subtilis，表明荷正电纳滤膜对革兰氏阴性菌的 抑制能力更强，且(HTCC/PAA)4HTCC-Ag 复合膜的抑菌性能明显优于(HTCC/PAA)4HTCC 复合膜及 PES 基膜。

毕业论文关键词 HTCC 荷正电复合纳滤膜 层层自组装 纳米银抗菌

毕业设计 说 明 书 外 文 摘 要

Title Preparation  and  characterization  of  quaternary chitosan/ polyacrylic acid composite membrane

Abstract In this paper, HTCC (2- hydroxypropyl trimethyl chitosan chloride) as a cationic polyelectrolyte layer to PAA (polyacrylic acid) as an anionic polyelectrolyte layer, in an ultrafiltration membrane made of PES (polyether sulfone) as base film layer。The positively charged (HTCC/PAA)nHTCC membrane has been prepared by self-assembly of alternating deposition。 Furthermore, to develop the anti pollution performance, we used optical technology to load silver nanoparticles onto the composite membrane surface。 In this paper, FTIR (Fourier transform infrared spectroscopy), contact angle, XRD (X-ray diffraction) were characterized。

Additionally by studying how different PAA concentration, pH and other properties impact on membrane interception, we defined the optimum film forming conditions, discussed the MWCO(molecular weight cutoff), characteristic of charge, hydrophilic and antimicrobial properties of the composite film were evaluated。

The optimal forming conditions of (HTCC/PAA)nHTCC composite nanofiltration membrane is: the concentration of HTCC casting solution is 5。0 g/L, the concentration of PAA casting solution is 1。0g/L, we added 0。05 g/L of NaCl salt into the solution for support, the best membrane is (HTCC/PAA)4HTCC, the volume fraction of crosslinking agent ECH (epichlorohydrin) is 1。2%, crosslinking time is 21 h。 The MWCO(molecular weight cutoff) of composite nanofiltration membrane is 1508, the order of inorganic salt solution's interception is MgCl2> NaCl> KCl> Na2SO4> K2SO4, the results also reflect the composite nanofiltration membrane is positive charged。 (HTCC/PAA)4HTCC-Ag composite nanofiltration membrane shows better antibacterial properties with E。coli Rosetta than Bacillus subtilis, illustrate positively charged nanofiltration membrane has a better antibacterial ability with Gram-negative bacteria, and (HTCC/PAA)4HTCC-Ag composite nanofiltration membrane has a much more better

antibacterial performance compared with (HTCC/PAA)4HTCC and PES base film。

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