<em>β</em>-环糊精修饰的壳聚糖对氯酚吸附的动力学和热力学

引用本文: 周良春, 孟祥光, 李建梅, 胡伟, 刘波, 杜娟. β-环糊精修饰的壳聚糖对氯酚吸附的动力学和热力学[J]. 物理化学学报, 2012, 28(07): 1615-1622. doi: 10.3866/PKU.WHXB201204282 shu

Citation: ZHOU Liang-Chun, MENG Xiang-Guang, LI Jian-Mei, HU Wei, LIU Bo, DU Juan. Kinetics and Thermodynamics of Adsorption of Chlorophenols onto β-Cyclodextrin Modified Chitosan[J]. Acta Physico-Chimica Sinica, 2012, 28(07): 1615-1622. doi: 10.3866/PKU.WHXB201204282 shu

β-环糊精修饰的壳聚糖对氯酚吸附的动力学和热力学

周良春 ^1, ,
孟祥光 ^1, ,
李建梅 ^1, ,
胡伟 ^2, ,
刘波 ^1, ,
杜娟 ^1,

基金项目:
国家自然科学基金(21073126) (21073126)

四川省自贡市科学技术局重点基金(10X01)资助项目 (10X01)

摘要:

制备了β-环糊精(β-CD)修饰的壳聚糖(CS)—β-环糊精-6-壳聚糖(CS-CD), 并用傅里叶变换红外(FT-IR)光谱仪, 扫描电镜(SEM), X 射线衍射(XRD)仪和比表面分析仪(BET)进行了表征. 详细研究了其对2-氯酚(2-CP)、2,4-二氯酚(DCP)和2,4,6-三氯酚(TCP)的吸附行为和机理. 研究表明其吸附较好地满足Langmuir 和Freundlich 吸附模型, β-环糊精的引入能够较大地提高吸附效率, 2-CP、DCP和TCP在CS-CD上吸附的最大吸附量分别为14.51、50.68和74.29 mg·g^-1. 动力学研究表明其吸附速率快, 在1 h内能达到吸附平衡, 并符合假二级动力学模型. 计算出了热力学参数ΔG⁰、ΔH⁰和ΔS⁰的值, ΔG⁰为负值表明吸附剂对氯酚的吸附是一个自发的过程. 电解质和溶液pH值对吸附的影响说明在吸附过程中主要是氯酚与吸附剂之间形成了氢键, 并进一步讨论了可能的吸附机理. 改性吸附剂易重复利用, 重复使用六次后的质量和吸附效率与初次相比分别保持在90%和82%以上, 然而CS的质量有较大的损失, 吸附效率也明显降低.

关键词:

壳聚糖
/ β-环糊精
/ 吸附
/ 氯酚
/ 热力学
/ 动力学

English

Kinetics and Thermodynamics of Adsorption of Chlorophenols onto β-Cyclodextrin Modified Chitosan

1.
1College of Chemistry, Sichuan University, Chengdu 610064, P. R. China;
2. School of Chemistry and Pharmaceutical Engineering, Sichuan University of Science & Engineering, Zi ng 643000, Sichuan Province, P. R. China
Received Date: 05 March 2012
Available Online: 07 June 2012
Fund Project:
国家自然科学基金(21073126)

四川省自贡市科学技术局重点基金(10X01)资助项目

Abstract:

β-Cyclodextrin (β-CD) modified chitosan (CS), β-cyclodextrin-6-chitosan (CS-CD), was prepared and subsequently characterized by Fourier transform-infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), and Brunauer-Emmett-Teller (BET) analysis. The CS-CD was used as an adsorbent for the adsorption of 2-chlorophenol (2-CP), 2,4-dichlorophenol (DCP), and 2,4,6-tuichlorophenol (TCP) from aqueous solutions. The Langmuir and Freundlich models were applied to describe the adsorption isotherms of the chlorophenols. The adsorption parameters have also been evaluated. The calculated maximum adsorption capacities for 2-CP, DCP, and TCP on CS-CD were 14.51, 50.68, and 74.29 mg·g^-1, respectively, indicating that the introduction of the β-CD moiety greatly increased the adsorption efficiency. Kinetic studies showed that the adsorptions were fast, in that all of the adsorption equilibria were reached within one hour, and that the adsorption processes followed a pseudosecond- order kinetic model. The thermodynamic parameters ΔG⁰, ΔH⁰, and ΔS⁰ were also calculated. The negative ΔG⁰ values indicated that all of the adsorption processes were spontaneous. A possible adsorption mechanism has been provided and discussed. The effects of electrolytes and pH values on adsorption revealed that hydrogen bonding between the chlorophenols and CS-CD dominated the adsorption process, which was further confirmed by FT-IR analysis. The adsorbent could be regenerated by washing with ethanol. Following six cycles of usage and regeneration, the mass and adsorption efficiency of the CS-CD remained at 90% and 82%, respectively. CS, however, showed greater mass loss and efficiency reduction following regeneration.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

β-环糊精修饰的壳聚糖对氯酚吸附的动力学和热力学

English

Kinetics and Thermodynamics of Adsorption of Chlorophenols onto β-Cyclodextrin Modified Chitosan

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

β-环糊精修饰的壳聚糖对氯酚吸附的动力学和热力学

English

Kinetics and Thermodynamics of Adsorption of Chlorophenols onto β-Cyclodextrin Modified Chitosan

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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