交联壳聚糖树脂吸附阿司匹林的动力学和热力学研究  

Study on adsorption kinetics and thermodynamics of aspirin on crosslinked chitosan resin

作　　者：刘玲[1] 梁海燕[1] 

机构地区：[1]肇庆学院化学化工学院,广东肇庆526061

出　　处：《食品工业科技》2016年第15期96-100,共5页Science and Technology of Food Industry

基　　金：广东省教育厅科技创新项目(2013KJCX0194)

摘　　要：以壳聚糖为原料,戊二醛为交联剂,通过水相均匀交联法制备出交联壳聚糖树脂,用红外光谱对其结构进行表征,并利用交联壳聚糖树脂对乙醇溶液中阿司匹林进行了吸附动力学和热力学研究。结果表明,在50 m L质量浓度为200 mg·L^(-1)的阿司匹林溶液中,交联壳聚糖投加量0.3 g、p H4.0、吸附温度293 K、搅拌速率150 r/min时,吸附动力学符合准二级动力学方程,表观吸附活化能为25.96 k J·mol^(-1),等温吸附更符合Freundlich方程。在293~333 K、阿司匹林吸附量为10~20 mg·g^(-1)条件下,吸附焓、自由能变及吸附熵变分别为-19.81^-13.80 k J·mol^(-1)、-1.83^-1.54 k J·mol^(-1)和-61.36^-36.81 J·mol^(-1)·K^(-1)。吸附过程为自发的不可逆放热熵减过程,且低温有利于吸附。为交联壳聚糖树脂吸附阿司匹林提供了理论基础。With chitosan as raw materials, g lutaraldehyde as crosslinked agent, crosslinked chitosan resin was made through the water phase homogeneous crosslinking, its structure was characterized with infrared spectrum, and the adsorption kinetics and thermodynamics of aspirin in ethanol solution was investigated using the crosslinked chitosan resin.Results showed that when the initial concentration of aspirin solution was 200 mg. L-1, pH was 4.0, adsorption temperature was 293 K, the stirring speed was 150 r/min, adsorbent dosage was 0.3 g/50 mL, adsorption kinetics accorded with quasi secondary dynamics equation, the apparent adsorption activation energy was 25.96 k J-mol-1. Isothermal adsorption conformed more to the Freundlich equation.When aspirin adsorption capacity was 10-20 mg·g-1, adsorption enthalpy, free energy change and adsorption entropy were -19.81- -13.80 kd-mol -1 ,-1.83--1.54 kJ. mo1-1 , and -61.36--36.81 d · mol -1· K-1 at 293~333 K, respectively.Adsorption process was thought to be spontaneous irreversible exothermic process,the system entropy was decreased and low temperature was good for adsorption, which provided a theoretical base for cross-linked chitosan resin absorption aspirin.

关 键 词：交联壳聚糖树脂 戊二醛 阿司匹林 吸附 动力学 热力学 

分 类 号：TS201.1[轻工技术与工程—食品科学]