壳聚糖复合水凝胶对水溶液中铜离子(Ⅱ)的高效吸附  

Preparation of Chitosan Composite Hydrogels and Its Effective Adsorption of Copper(Ⅱ) Ions from Aqueous Solutions

作　　者：郭逗逗[1,2,3] 庞浩[1,2] 刘海露[1,2] 徐莉莉[1,2] 郑景新[1,2] 廖兵[1,2] 

机构地区：[1]中国科学院广州化学研究所 [2]中国科学院纤维素化学重点实验室,广东广州510650 [3]中国科学院大学,北京100049

出　　处：《林产化学与工业》2014年第1期8-12,共5页Chemistry and Industry of Forest Products

摘　　要：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4000 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。A series of adsorbents synthesized from chitosan-grafted-methacrylic acid/acrylamide/sodium allyl sulfonate （ CTS-g-MAA/AM/SAS） composite hydrogels with various amounts of SAS were prepared. The effects of particle size, dosage of composite hydrogel, the pH value and initial concentration of Cu2＋ in solution on the adsorption capacity were investigated. The results showed that a adsorption capacity of the CTS-g-MAA/AM/SAS composite hydrogels was increased with the increasing of pH value. A maximum absorption amount of Cu2＋ of 823 mg/g was observed using 0. 1 g/25 mL absorbent with particle size of 0.074-0. 2 mm under pH value of 6. 0. Freundlich, Langmuir plots and their isotherm coefficients for the adsorption of Cu2＋indicated a multilayer adsorption behavior using this adsorbent.

关 键 词：壳聚糖 改性 水凝胶 吸附剂 铜离子 

分 类 号：TQ35[化学工程]