甲壳素对铜的吸附性能研究

Studies on the Adsorption Behavior of Chitin for Copper(Ⅱ)

研究了甲壳素吸附铜离子的过程。结果表明:甲壳素对铜离子的吸附在pH=4.46时最佳,在298 K下测得静态饱和吸附容量为317.2 mg/g(树脂)。用1.0 mol/L HCl可洗脱,洗脱率达97.4%;测得表观速率常数k298=1.34×10-4/s;表观活化能Ea=26.1 kJ/mol;等温吸附服从Freundlich经验式;吸附热力学参数△H=11.3 kJ/mol,△S=42.6 J/(mol.K),△G=-1.4 kJ/mol。

The adsorption behavior of chitin for Cu2＋ is investigated. Chitin has a good adsorption ability for Cu2＋ in the HAc-NaAc medium at pH=4.56 The statically saturated sorption capacity is 317.2 g/gresin. Cu2＋ adsorbed on chitin can be eluted quantitatively by using 1.0-2.0 mol/L hydrochloric acid as an eluant. The apparent rate constant is k298=1.34×10^-4/s. The apparent activation energy of chitin for Cu2＋ is 26.0 kJ/mol. The adsorption behavior chitin for Cu2＋ obeys the Freundlich isotherm. The adsorption thermodynamic parameters of chitin for Cu2＋ are enthalpy change △H=11.3 kJ/mol, free energy change △G=-1.4 kJ/mol, entropy change △S=42.6 J/（mol· K）.