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为改善壳聚糖的耐酸性及对Pb(Ⅱ)的吸附容量,将壳聚糖与丙烯酰胺接枝,再与戊二醛进行交联,制备出了壳聚糖改性聚合物(G-CAM)。研究了制备条件对接枝率和接枝效率的影响,结果表明,在T=70℃;单体浓度(m壳聚糖:m丙烯酰胺)为1:3;引发剂浓度为0.10g;接枝反应时间为4h时,可制得较为满意的接枝壳聚糖产物。对交联剂的用量通过耐酸性实验和Pb2+吸附实验进行了考察,结果表明,当m壳聚糖:m丙烯酰胺=1:3(m壳聚糖=1g)时,交联剂戊二醛的加入量为0.6mL,得到的产物制备成的吸附剂不但有较好的耐酸性,而且对Pb(Ⅱ)吸附效果最佳。经吸附剂再生实验,G-CAM对Pb(Ⅱ)的吸附量变化幅度小于1%,可重复使用。
In order to improve the acid resistance of chitosan and the adsorption capacity of Pb (Ⅱ), chitosan and acrylamide were grafted and then crosslinked with glutaraldehyde to prepare chitosan modified polymer (G- CAM). The effects of preparation conditions on graft ratio and grafting efficiency were studied. The results showed that the initiator concentration was 0.10g at T = 70 ℃, monomer concentration (m-chitosan: m-acrylamide) was 1: 3, When the reaction time was 4h, the grafted chitosan product could be obtained satisfactorily. The amount of crosslinking agent was investigated by acid resistance test and Pb2 + adsorption experiment. The results showed that when m chitosan: m acrylamide = 1: 3 (m chitosan = 1g), the crosslinking agent glutaraldehyde Of the added amount of 0.6mL, the resulting product prepared adsorbent not only has better acid resistance, and the best adsorption of Pb (Ⅱ). After sorbent regeneration experiments, the adsorption amount of G (superscript 2 +) by Pb (Ⅱ) changed less than 1%, which could be reused.