壳聚糖丙烯酸共聚物的制备及其吸附性研究  

Preparation and adsorption behavior of graft copolymer by chitosan with acrylic acid

作　　者：蒋林斌[1] 张艳艳[1] 梁达星[1] 汤善刚[1] 袁霞[1] 廖丹葵[1] 

机构地区：[1]广西大学化学化工学院,广西石化资源加工及过程强化技术重点实验室,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2013年第3期515-520,共6页Journal of Guangxi University（Natural Science Edition）

基　　金：广西自然科学基金资助项目(桂科自2011GXNSFD018012);广西教育厅科研基金资助项目(200807MS009)

摘　　要：以壳聚糖(CTS)和丙烯酸(AA)为原料,采用过硫酸铵引发接枝共聚反应,制备了壳聚糖与丙烯酸的接枝共聚物(CTS-g-AA),考察了丙烯酸的用量、引发剂质量、反应温度和反应时间对接枝共聚反应的影响。用红外光谱仪对产物结构进行了表征,并研究了接枝共聚物对Cr3+、Pb2+的吸附性能。实验结果表明,接枝聚合反应的最佳反应条件:丙烯酸用量3.5 mL,引发剂质量0.2 g,反应温度65℃,反应时间4 h。红外光谱显示其有明显的—COOH峰,即壳聚糖成功接枝了丙烯酸;接枝共聚物和壳聚糖对Cr3+的吸附容量分别为144.7、116.4 mg/g,对Pb2+的吸附容量分别为38.1、18.2 mg/g,接枝共聚物对两离子都有吸附作用,且明显好于壳聚糖,其中对Cr3+的吸附远远强于对Pb2+的吸附,两者最大吸附容量相差约4倍;溶液的pH值对吸附有明显的影响,可通过控制溶液pH值对金属离子进行吸附或脱附处理,故共聚物可应用于废水中金属离子回收处理。Graft copolymer （CTS-g-AA） was prepared by grafting copolymerization of chitosan （CTS） with acrylic acid （AA） using ammonium persulfate as initiator. The effects of the amount of AA, initiator, reaction temperature and reaction time on the graft copolymerization were investiga- ted, respectively. The structure of graft copolymer was characterized by FT-IR and adsorption behaviors of graft copolymer on Cr^3＋ and Pb^2＋ were researched. The results show that the optimal reaction conditions of graft copolymerization were 3.5 mL of AA, 0.2 g of （NH4）2S2Os, reaction temperature at 65℃ and reaction time in 4 h, respectively. The -COOH peaks of graft copolymer were visibly revealed on infrared spectra, showing that chitosan was successfully grafted on to the acrylic acid. The adsorption capacities for Cr^3＋ on graft copolymer and chitosan were 144.7 mg/g and 116. 4 mg/g and for Pb2＋ were 38.1 mg/g and 18.2 rag/g, respectively. The graft copolymer has satisfactory adsorption effect for Cr^3＋ and Pbz ＋ and better than that of chitosan. Among them, it had stronger adsorption for Cr^3＋ with the maximum adsorption capacityfor Cr^3＋ being about four times as high as for Pb^2＋. The adsorption capacity was affected by the pH value of solution. Thus it was pos-sible to recycle the metal ions of waste water by adjusting the pH value to control the absorption and desorption of the melal ions

关 键 词：壳聚糖 丙烯酸 接枝共聚 吸附 

分 类 号：TQ342.8[化学工程—化纤工业]