首页  |  本刊简介  |  编委会  |  投稿须知  |  订阅指南  |  联系我们  |  微信  |  出版道德声明  |  Ei收录本刊数据
Cu( Ⅱ )印迹壳聚糖交联膜的表征及其吸附热力学特性
摘要点击 1654  全文点击 794  投稿时间:2011-09-27  修订日期:2012-01-11
查看HTML全文 查看全文  查看/发表评论  下载PDF阅读器
中文关键词  印迹交联壳聚糖膜  表征  吸附  热力学
英文关键词  imprinted chitosan crosslinked membrane  characterization  adsorption  thermodynamics
作者单位E-mail
张玉红 大连理工大学环境学院,工业生态与环境工程教育部重点实验室,大连 116024 yuhongwp@163.com 
张爱丽 大连理工大学环境学院,工业生态与环境工程教育部重点实验室,大连 116024 zal58@163.com 
周集体 大连理工大学环境学院,工业生态与环境工程教育部重点实验室,大连 116024  
孙筱雨 大连理工大学环境学院,工业生态与环境工程教育部重点实验室,大连 116024  
中文摘要
      为处理低浓度重金属废水,采用分子印迹、化学预交联及交联方法,制备了一种新型的Cu(Ⅱ)印迹壳聚糖交联膜(IMCu(Ⅱ)-E-CTS),对该膜的孔隙率、溶胀率、氨基含量、表面形态、官能团以及结晶性等性能进行了表征.考察了该膜对低浓度(20~70 mg·L-1)Cu(Ⅱ)的吸附热力学特性.结果表明,IMCu(Ⅱ)-E-CTS孔隙率、溶胀率和氨基含量分别为76.9%、 109%、 4.26 mmol·g-1; 与壳聚糖膜(CTS)相比,IMCu(Ⅱ)-E-CTS溶胀率降低了44.0%、孔隙率升高了528%、氨基含量降低了16.5%; 与壳聚糖交联膜(E-CTS)相比,其氨基含量升高了24.6%; 与CTS和E-CTS相比,IMCu(Ⅱ)-E-CTS的表面形态发生了显著的变化,内部结构变得疏松; 与CTS相比,IMCu(Ⅱ)-E-CTS分子链具有不规整性,结晶能力降低.在含等浓度Cu(Ⅱ)、Ni(Ⅱ)、Zn(Ⅱ)混合溶液中,IMCu(Ⅱ)-E-CTS对Cu(Ⅱ)表现出具有良好的选择性.IMCu(Ⅱ)-E-CTS对Cu(Ⅱ)浓度为20~70 mg·L-1的吸附符合Freundlich等温曲线(R2>0.99),该吸附是自发、放热、熵减小的过程.
英文摘要
      A new type of Cu(Ⅱ)-imprinted chitosan crosslinked membrane (IMCu(Ⅱ)-E-CTS) was prepared via molecular imprinting technology, chemical pre-crosslinking and crosslinking methods for treatment of wastewater containing low concentration of copper ion. IMCu(Ⅱ)-E-CTS was characterized by porosity, swelling ratio, amino group content, surface morphology, functional group and crystallinity. The thermodynamic properties of Cu (Ⅱ) adsorption on the as-synthesized membrane at the low concentration (20-70 mg·L-1) were studied. It is found that porosity, swelling ratio and amino group contents of IMCu(Ⅱ)-E-CTS are 76.9%、 109% and 4.26 mmol·g-1, respectively. Compared to the pristine chitosan membrane (CTS), 44.0% lower swelling ratio, 528% higher of porosity, 16.5% lower of amino group content are found with IMCu(Ⅱ)-E-CTS. Compared to crosslinked chitosan membranes (E-CTS), 24.6% higher amino group content is found with IMCu(Ⅱ)-E-CTS. Compared to CTS and E-CTS, the membrane morphology of IMCu(Ⅱ)-E-CTS has undergone significant changes, and the internal structure became loose. Compared with CTS, molecular chain of IMCu(Ⅱ)-E-CTS is irregular and its crystallinity ability is lowered. IMCu(Ⅱ)-E-CTS adsorbs more Cu(Ⅱ) than that of the other two metal cations [Ni(Ⅱ) and Zn(Ⅱ)]. The adsorption of copper ion on IMCu(Ⅱ)-E-CTS for 20-70 mg·L-1 of initial Cu(Ⅱ) concentration follows the Freundlich adsorption isotherm(R2>0.99). The adsorption is a spontaneous, exothermic, and entropy-decreased process.

您是第19841131位访客
主办单位:中国科学院生态环境研究中心 单位地址:北京市海淀区双清路18号
电话:010-62941102,62849343 传真:010-62849343 邮编:100085 E-mail: hjkx@rcees.ac.cn
本系统由北京勤云科技发展有限公司设计  京ICP备05002858号-2