壳聚糖印迹聚合物对Zn^(2+)的吸附动力学  

Kinetics of adsorption of Zn^(2+) on imprinted chitosan polymer

作　　者：洪英[1] 钟泽辉[1] 郭宾[2] 

机构地区：[1]湖南工业大学科技学院,湖南株洲412008 [2]湖南师范大学化学生物学及中药分析教育部重点实验室,湖南长沙410081

出　　处：《化工进展》2011年第6期1296-1301,共6页Chemical Industry and Engineering Progress

基　　金：湖南省教育厅项目(08C293);湖南省科技厅项目(2010SK3041)

摘　　要：以Zn2+作为模板,加入分散剂石蜡、预交联剂甲醛、交联剂环氧氯丙烷,制得特性壳聚糖印迹聚合物,用X射线衍射仪表征了聚合物的结构,考察了聚合物用量、温度等对吸附Zn2+的影响,研究了印迹聚合物对Zn2+的吸附动力学、等温吸附特性。结果表明,印迹聚合物合成过程中打破了壳聚糖原有晶体的规整性,增加了大量的配位基团,使聚合物的吸附容量大大增加,同时聚合物对Zn2+有很好的选择吸附性,对Zn2+、Cd2+、Mg2+、Mn2+溶液的分离因子均大于1.5;印迹聚合物能快速吸附溶液中Zn2+,整个吸附过程符合拟二级动力学模型:t/Qt=8.1744+2.0186t,相关系数为0.998,吸附平衡容量模型计算值与实验值较为吻合;印迹聚合物对Zn2+的等温吸附过程符合Langmuir吸附等温吸附模型:Ce/Qe=1.3297+0.02701Ce,最大吸附容量为37.023 mmol/g,吸附过程主要以单分子层的吸附形式进行。Zn2＋ was used as template with paraffin as dispersant agent,formaldehyde as pre-crosslinking agent,and epichlorohydrin as crosslinking agent to prepare a imprinted chitosan polymer.The structure of the polymer was characterized by X ray diffractometer（XRD）.The dosage of the polymer and the influence of temperature on the adsorption of Zn2＋ were studied.Studies on the kinetics of the adsorption of Zn2＋ by the imprinted polymer and the isothermal adsorption properties were also performed.The result showed that the regularity of the chitosan crystals was broken in the preparation of the imprinted polymer,adding a large amount of coordination group which enlarged adsorption capacity.Meanwhile the polymer acquired a highly selective adsorption capacity to Zn2＋,and the separation factor of Zn2＋,Cd2＋,Mg2＋,Mn2＋ were all greater than 1.5.The imprinted polymer adsorbed the Zn2＋ rapidly,and the whole adsorption process fitted the pseudo-second-order kinetic model well,t/Qt=8.1744＋2.0186t and the correlation coefficient was 0.998.The calculated equilibrium adsorption capacity was satisfactory compared with the experiment data.The adsorption process at a constant temperature fitted the Langmuir equation of isothermal adsorption：Ce/Qe=1.3297＋0.02701Ce and the maximum adsorption capacity was 37.023 mmol/g.The adsorption mainly proceeded in the form of monolayer.

关 键 词：壳聚糖 印迹 吸附 Zn2+ 动力学 

分 类 号：O636.1[理学—高分子化学]