壳聚糖锰配合物的吸附动力学

Study on Adsorption Kinetics of the Chelate of Chitosan with Manganese

为了更好地发挥壳聚糖与锰本身独特的生物活性,将壳聚糖与锰盐反应,制备了壳聚糖锰配合物。采用分光光度法测定了锰的含量,研究了壳聚糖对锰的吸附动力学行为。结果表明,在一定浓度范围内,壳聚糖(CTS)对锰的吸附符合Langmuir和Freundlich等温吸附模型,pH=3.5时吸附20h的饱和吸附量为Qmax=3.099g/g,吸附平衡常数K=120.4L/g,吸附焓变ΔH=16.81kJ/mol。在35℃时,壳聚糖对锰的吸附符合吸附动力学一级反应方程,且求得吸附表观活化能Ea=29.08kJ/mol,初始锰质量浓度为1g/L时,Langmuir一级速率常数k为0.396h-1。试验为壳聚糖锰配合物的进一步应用研究工作,提供了一些基础理论数据。

In order to make full use of chitosan and manganese, in this paper the isothermal adsorption kinetics of chitosan with manganese was investigated by adsorption method. The study of the adsorption kinetics showed that the rate of adsorption effect of manganese on chitosan could be interpreted in term of first order reaction. The experimental data of adsorption equilibrium from manganese solutions were satisfied with the Langmuir and Fruendlich isotherm equation. The results showed that Mn with chitosan was chelate. The adsorption saturation value was 3.099 g/g at pH=3.5, the adsorption balance constant was 120.4 L/g and the adsorption enthalpy variety was 16.81 kJ/mol. The apparent adsorption activation energy was 29.08 kJ/mol and the sorption rate constant of the Lagergren-one-order sorption was 0.396 h -1 at 35℃. This study will provide some basis theoretic data for application of the chelate of chitosan with manganese.