壳聚糖纳微粒棉织物表面平衡吸附研究  

Equilibrium Studies on the Adsorption of Chitosan Nano-/ Micro-particles onto Cotton Fabric Surfaces

作　　者：王明熙[1] 佘远斌[1,2] 肖作兵[3] 付海燕[4] 

机构地区：[1]北京工业大学环境与能源工程学院,北京100124 [2]浙江工业大学化学工程学院,杭州310014 [3]上海应用技术学院香料香精技术与工程学院,上海201418 [4]中南民族大学药学院,武汉430074

出　　处：《科学技术与工程》2015年第17期4-9,共6页Science Technology and Engineering

基　　金："十二五"国家科技攻关计划项目(2011BAD23B01);国家自然科学基金(21276157;21276006;21476270);上海香料香精工程技术研究中心项目(12DZ2251400)资助

摘　　要：通过热重分析法（TGA）系统地研究了不同温度下壳聚糖纳微粒（CNs）在棉织物表面的平衡吸附行为,并借助Langmuir、Freundlich及Dubinin-Radushkevich等温模型拟合曲线计算了吸附过程热力学参数.结果发现,三种等温吸附模拟均可对CNs棉织物表面平衡附着行为进行一定程度地描述,且在5～75℃下无交联剂吸附过程的标准吉布斯自由能变（△Go）、焓变（△H0）及熵变（△S0）均小于0,表明CNs在棉织物表面的附着行为是一个自发、放热且体系混乱度降低的过程.同时随着温度的降低,吸附过程的平均附着能（E）及△Go绝对值均不断增大,表明温度下降有利于吸附反应的进行,CNs与棉织物间的结合作用增强,且逐渐表现出化学吸附特性.The equilibrium adsorption behaviors of the chitosan nano/micro-particles （CNs） onto cotton fabric surfaces were studied by Thermo Gravimetric Analysis （TGA） under different temperatures. Additionally, the fitting curves of Langmuir, Freundlich, and Dubinin-Radushkevich isotherm models were employed to calculate the adsorption thermodynamics parameters. The results suggested that the three isotherm models were also viable for de- scribing the equilibrium adsorption of CNs onto cotton fabrics. In addition, the negative values of the standard Gibbs free energy changes （ AG~） , enthalpy changes （ AH~） , and entropy changes （ AS~） of the adsorption at 5 75 ~C indicated that the process of CNs onto cotton fabric surfaces was exothermic and spontaneous with a decrease in randomness. Furthermore, the absolute values of the average energies （E） and △G0 of the adsorption process progressively increased with the decreasing temperature. This finding confirmed that more powerful interactions could be formed between CNs and cotton fabrics, and the adsorption process exhibit chemisorption properties under a low temperature.

关 键 词：壳聚糖纳微粒 棉织物 无交联剂吸附 平衡吸附 热力学 

分 类 号：O636.1[理学—高分子化学]