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.
出处
《矿物学报》
CAS
CSCD
北大核心
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)
