氨基酸改性壳聚糖基金属离子吸附材料的制备和性能

发布时间：2018-07-20 19:17

【摘要】：以壳聚糖(CS)为基体、以1-(3-二甲氨基丙基)-3-乙基碳二亚胺盐酸盐(EDC.HCl)为缩合剂、N-羟基-丁二酰亚胺(NHS)为偶联剂,将L-精氨酸固载到CS大分子上,L-精氨酸接枝壳聚糖CS-L-Arginine(CA),通过单因素实验优化接枝工艺,制备出一种天然高分子基重金属螯合材料。应用元素分析、红外光谱(FT-IR)、拉曼光谱(RAM)和X-射线衍射(XRD)等手段表征了产物的结构组成,研究了接枝机理。用坂口反应并结合凯氏定氮法测定了产物的接枝率GR。结果表明,当反应物物质的量比为n CS:n Arg:n EDC=1:1:1、n EDC:n NHS=3:1、反应时间12 h、体系的pH值=5时,接枝率(GR)可达16.85%。调整反应物的投入比,可制备出接枝率不同的接枝产物。吸附实验结果表明,与CS相比,CA(GR=16.85%)使高浓度溶液中的Cu~(2+)、Ni~(2+)离子的去除率显著提高,CA的抗菌性比CS也显著增强,GR为16.85%的CA几乎完全抑制了大肠杆菌和金黄色葡萄球菌的生长。
[Abstract]:Chitosan (CS) was used as matrix and 1- (3-dimethylaminopropyl) -3-ethyl carbodiimide (EDC.HCl) as coupling agent. L- arginine was immobilized on CS macromolecule and L-arginine was grafted with chitosan CS-L-Arginine (CA). A natural polymer based heavy metal chelate material was prepared by single factor experiment. Elemental analysis, infrared spectroscopy (FT-IR), Raman spectroscopy (RAM) and X-ray diffraction (XRD) were used to characterize the structure of the product, and the grafting mechanism was studied. The grafting rate of GR was determined by Sakaguchi reaction and Kjeldahl method. The results show that when the molar ratio of reactants is n CS: n Arg:n EDC1: 1: 1: 1 n EDCW n NHSN 3: 1, the reaction time is 12 h, the pH value of the system is 5, the graft ratio (gr) can reach 16.85%. The graft product with different grafting rate can be prepared by adjusting the input ratio of reactants. The results of adsorption experiment showed that compared with CS, CA (GRN 16.85%) significantly increased the removal rate of Cu2 + Ni2 ions in high concentration solution. Compared with CS, CA with 16.85% GR inhibited the growth of Escherichia coli and Staphylococcus aureus almost completely.
【作者单位】：天津工业大学;
【基金】：国家自然科学基金5150030497 国家级现代农业产业技术体系专项CARS-44-D资助项目~~
【分类号】：X703;TQ424

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