D301 R树脂吸附金(Ⅲ)的实验  

STUDIES ON SORPTION OF D301 R RESIN FOR AU(Ⅲ)

作　　者：莫建军[1] 施林妹[2] 熊春华 

机构地区：[1]丽水学院化学系,浙江丽水323000 [2]丽水职业技术学院,浙江丽水323000 [3]浙江工商大学食品生物与环境工程学院,浙江杭州310035

出　　处：《矿物学报》2006年第3期272-276,共5页Acta Mineralogica Sinica

基　　金：浙江省高校中青年学科带头人基金;浙江省测试基金资助项目(编号:04094);浙江省教育厅科研项目(编号:20031146);丽水市科研计划项目(编号:200420)

摘　　要：研究了D301R树脂对金(Ⅲ)的吸附性能及其机理,测得在HAc-NaAc体系中pH=3.47时为最佳吸附条件。在298 K的温度下,pH=3.47的HAc-NaAc缓冲体系中树脂对金(Ⅲ)的静态饱和吸附容量为828.36 mg/g;测得吸附热力学参数分别为:ΔH=16.77 kJ/mol,ΔS=59.36J/mol K,ΔG298=-919.28 J/mol;吸附速率常数k298=2.17×10-5s-1,吸附活化能Ea=9.43 kJ/mol;用20%硫脲的丙酮溶液和6 mol/L的HCl溶液以1∶1混合洗脱,洗脱率达到95%以上;等温吸附曲线能很好地遵循Freundlich曲线;树脂的功能基与金(Ⅲ)的配位比接近1∶1。Sorption behavior and mechanism of D301R resin for Au（ Ⅲ ） were investigated. D301R resin has a good adsorptivity for Au（ Ⅲ ） in HAc-NaAc medium at p = 3.47. The statically saturated Au（ Ⅲ ） motion capacity was 828.36 mg/g resin at 298 K in HAc-NaAc medium. The thermodynamic motion parameters,enthalpy change AH,entropy change AS and free energy change △G298 of D301R for Au（ Ⅲ ） were 16.77 kJ/mol, 59.36 J（/mol· K）, and -919.28 J/mol, respectively. The sorption rate constant is k298= 21.7 × 10^5s^-1. The activation energy was Ea = 9.43 kJ/mol.The Au（ Ⅲ ） adsorbed on D301R resin could be eluted by 20%NH2CSNH2-acetone and 6 mol/L HCl and the elufion percentage reached 95% .The adsorption behavior of D301R for Au（ Ⅲ ） obeys the FreuncUich isotherm. The molar coordination ratio of the functional group of D301R to Au（ Ⅲ ） is about 1 ： 1.

关 键 词：D301R树脂 金(Ⅲ) 吸附 解吸 

分 类 号：O614.123[理学—无机化学] TF831[理学—化学]