甲壳素对铥(Ⅲ)吸附行为及机理研究  

Studies on the Adsorption Behavior of Chitin for Thulium(Ⅲ)

作　　者：施林妹[1] 王惠君[2] 高伟彪[3] 

机构地区：[1]丽水职业技术学院,浙江丽水323000 [2]浙江海洋学院海洋科学学院,浙江舟山316004 [3]浙江海洋学院食品与药学学院医学院,浙江舟山316004

出　　处：《稀土》2012年第6期27-31,共5页Chinese Rare Earths

基　　金：浙江省教育厅科研资助项目(20040551)

摘　　要：对甲壳素吸附铥(Ⅲ)的过程及吸附行为进行了研究。考查了溶液介质pH、温度、吸附时间、甲壳素量等因素对吸附行为的影响。实验结果表明,甲壳素对铥的吸附在pH=4.93时为最佳。25℃时静态饱和吸附量为319.2 mg.g-1。用0.5 mol.L-1的HCl溶液作为解吸剂,解吸率为97.6%;甲壳素对铥(Ⅲ)表观吸附活化能Ea=2.61 kJ.mol-1,表观吸附速率常数k298=7.93×10-5s-1,测得热力学参数分别为ΔH=16.5 kJ.mol-1,ΔG=-0.48 kJ.mol-1,ΔS=57.12 J.mol-1.K-1,吸附行为服从Freundlich经验式,并用化学和红外光谱的方法探求甲壳素对铥(Ⅲ)的吸附机理。The adsorption behavior and mechanism of chitin for thulium （ III ） were investigated. The effects of pH, temperature, time and chltin＇s quantity on adsorption behavior of chitin for thulium were measured. Tm is quantitatively adsorbed by chitin in the medium of pH -4.93, the statically saturated adsorption capacity at 25 ℃ is 319.2 mg/g. The elution rate of Tin（ III ） adsorbed by chitin is 97.6% with 0.5 mol · L-1 HCl. The apparent adsorption activation energy of chitin for Tm is 2.61kJ·mol-1. The rate constant is 7.93×10-5s-1. The adsorption behavior of Tm on chitin follows the Freundlich isotherm formula. AH of the adsorption is 16.5 kJ/mol, AG is - 0.48 kJ/mol, AS was 57.12 J·mol-1·K-1. The adsorption mechanism of chitin for Tm was examined by using, chemical method and IR snectrometrv.

关 键 词：甲壳素 吸附行为 吸附机理 铥(Ⅲ) 

分 类 号：TF804.3[冶金工程—有色金属冶金] TF812