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摘要本文使用改性剂2,3-环氧丙基三甲基氯化铵(GTMAC)，将壳聚糖改性为2-羟丙基三甲基氯化铵壳聚糖(HTCC)，和PSS(聚苯乙烯磺酸钠)分别作为聚阳离子和聚阴离子层，层层自组装作为一种新型的方法，本文使用来制备出带正电的HTCC-PSS/PES复合纳滤膜。28487
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通过扫描电子显微镜、傅立叶红外光谱、接触角这些检测方法对复合膜进行了表征。研究了制膜过程中的沉浸顺序、铸膜液浓度、自组装层数、支撑盐种类及浓度对最终膜性能的影响。并且检测了复合膜的一些基本性能，如：纯水渗透系数、截留分子量、荷电性、对PPCPs的处理效果以及抗菌性等性能。
实验结果表明，(HTCC/PESS)n(HTTC)复合纳滤膜的最好的条件为：铸膜液浓度为5g/L，用0.1g/L的NaCl作为支撑盐，组装四层半复合膜，将基膜先沉浸在HTCC溶液中，交联时间在21h左右。膜的纯水渗透系数为17.925 kg•m-2•h-1•MPa-1，截留分子量为1412，；对三种PPCPs的去除效果分别为阿替洛尔>卡马西平>布洛芬，这些反映了该复合纳滤膜的荷正电特性。并且随着复合膜层数的增加，对细菌的抑制作用也逐渐增加，对细菌的抑制作用顺序为：E.coli DH5a(G-ve)>E.coli Rosetta(G-ve)>Bacillus subtilis(G+ve)。
毕业论文关键词 2-羟丙基三甲基氯化铵壳聚糖 复合纳滤膜 层层自组装 膜性能
毕业设计说明书外文摘要
Title Preparation of chitosan NF membrane by layer by layer Self assembly .
Abstract
Using 2,3-epoxy-trimethyl ammonium chloride (GTMAC) as the modifier, change chitosan into 2-hydroxypropyl Ammonium Chloride, and with PSS (polystyrene sulfonate) as the surfactant layer. LBL self-assembly as a new method，Using this method to prepare a positively charged composite nanofiltration membrane.
The prepared NF membrane was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and Contact angle. The effect of preparation conditions such as the concentration of HTCC and NaCl,the rejection of three PPCPs, ect.
The results indicated that the (HTCC/PESS)n(HTTC) composite membrane from 5g/L HTCC casting solution, 0.1g/L NaCl as the supporting salt, Four semi-assembled composite film, The film first immersed in HTCC solution, cross-linked about 21h was found to have optimum performance.The pure water permeability of the membrane is 17.925 kg•m-2•h-1•MPa-1, its MWCO is about 1412(in nanofiltration range). The rejection of three PPCPs follows the decreasing order of Atenolol, Carbamazepine, Ibuprofen, those showing the positively charged characteristic of the membrane. In addition, the antibacterial ability of the composite membranes enhanced along with the increasing layer of the membrane, and these membranes show greater antibacterial activity against G-ve bacteria E.coli than G+ve bacteria Bacillus subtilis.
Keywords HTCC composite NF membrane layer-by-layer self-assembly membrane performance
目 次
1 绪论1
1.1 壳聚糖的研究 1
1.1.1 壳聚糖的应用与改性.1
1.1.2 壳聚糖季铵化 1
1.2 纳滤膜技术的进展.1
1.2.1 纳滤膜的技术介绍 1
1.2.2 纳滤膜的制备方法介绍2
1.3 自主装制模技术.2
1.3.1 自主装技术的原理.2
1.3.2 层层自主装制模技术的研究 3
1.3.3 聚电解质层层自主装技术的发展与应用3
2 实验部分 5
2.1 实验所用试剂 5
2.2 实验所用仪器 6
2.3 HTCC的制备方法与步骤6
2.4 HTCC/PSS复合纳滤膜的制备 7
2.5 HTCC/PSS复合纳滤膜的表征 7
2.5.1 扫描电镜测试 7
2.5.2 傅立叶红外 7