【摘要】 进行了铅离子在甲壳素上的吸附行为实验,结果表明在pH=4.46时吸附最佳。测得静态饱和吸附容量为478mg.g-1(树脂);用0.5mol.L-1HCl可洗脱,洗脱率达98.8%;测得表观速率常数k298=8.53×10-5s-1;表观活化能Ea=16.54kJ.mol-1;等温吸附服从Freundlich经验式;吸附热力学参数△H=8.70kJ.mol-1,△S=41.7J.mol-1.K-1,△G=-3.71kJ.mol-1。更多还原

【Abstract】 The adsorption behavior of chitin for Pb2+ is investigated.Chitin has a good adsorption ability for Pb2+in the HAc-NaAc medium at pH=4.56 The statically saturated sorption capacity is 478g/g·resin.Pb2+ adsorbed on chitin can be eluted quantitatively by using 0.5mol/L hydrochloric acid as an eluant.The apparent rate constant is k298=8.53×10-5s-1.The apparent activation energy of chitin for Pb2+ is 16.54kJ·mol-1.The adsorption behavior chitin for Pb2+ obeys the Freundlich isotherm.The adsorption thermodynamic parameters of chitin for Pb2+ are enthalpy change △H=8.70kJ·mol-1,free energy change △G=-3.71kJ·mol-1,entropy change △S=41.7J·mol-1·K-1.更多还原