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。
The adsorption behavior of chitin for Pbz＊ 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 quantitative- ly by using 0. 5moL/L hydrochloric acid as an eluant. The apparent rate constant is k298 = 8.53×10-5 s-1. The apparent activation en- ergy of chitin for Pb2＋ is 16. 54kJ ·mol-I. The adsorption behavior chitin for Pb2＋ obeys the Freundlich isotherm. The adsorption thermodynamic parameters of chitin for Pbz＋ are enthalpy change AH=8.70kJ· mol-1 ,free energy change AG=-3.71kJ - mol-1 , entropy change AS=41.7J ·mo1-1 · K-1.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2013年第3期336-339,共4页
Chemical Research and Application
基金
浙江省高校中青年学科带头人基金项目资助
浙江省教育厅科研项目(20040551)资助
关键词
甲壳素
铅(Ⅱ)
吸附
chitin
lead （II）
adsorption behavior
