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以甲基丙烯酸(MAA)、丙烯酰胺(AM)和烯丙基磺酸钠(SAS)同时对壳聚糖进行接枝改性,合成了一系列对水溶液中的二价铜离子具有高效吸附性能的壳聚糖水凝胶。研究了吸附剂粒径、投料量、溶液pH值对吸附容量的影响,同时进行了对金属铜离子的吸附性能研究。结果显示,粒径0.074~0.2 mm的吸附剂,在25 mL铜离子(II)质量浓度4 000 mg/L,pH值6的硝酸铜溶液中,投入量为0.1 g时,壳聚糖复合水凝胶最大吸附量为823 mg/g,同时吸附容量随溶液pH值增加而增加,随投料量的增大而减小。吸附等温线研究表明,Freundlich吸附模型能更好地描述吸附剂对铜离子(II)的吸附行为,说明其吸附过程是不均匀的多分子层吸附过程。
Chitosan was grafted and modified with MAA, AM and SAS, and a series of high performance adsorption of divalent copper ions in aqueous solution were achieved. Chitosan hydrogel. The effects of adsorbent particle size, loading amount and solution pH on the adsorption capacity were studied. Meanwhile, the adsorption properties of copper metal ions were studied. The results showed that when the dosage of 0.1 g was 25 mL copper nitrate solution with the concentration of 4 000 mg / L copper ion (II) and pH 6, the adsorbent with the particle size of 0.074-0.2 mm, the chitosan composite water The maximum adsorption capacity of gel was 823 mg / g, while the adsorption capacity increased with the increase of solution pH, and decreased with the increase of feed amount. Adsorption isotherm studies show that the Freundlich adsorption model can better describe the adsorbent adsorption of copper (II), indicating that the adsorption process is uneven multi-layer adsorption process.