CAJ | 학술논문

研究了硅基季铵化分离材料(SiR_4N)在硝酸溶液中对Pu(Ⅳ)的吸附性能和机理.结果表明,SiR_4N对Pu(Ⅳ)的吸附等温线基本符合Langmuir吸附等温线,吸附为放热反应,ΔH＝-7.23 kJ/mol.机理研究结果表明,分配比D与树脂功能基团SiR_4N~+的关系式为:lg D=3.43+1.74lg n(SiR_4N~+),其配位比接近于2,由此可推测SiR_4N在硝酸溶液体系主要吸附的是[Pu(NO_3)_6]~(2-).
연구료규기계안화분리재료(SiR_4N)재초산용액중대Pu(Ⅳ)적흡부성능화궤리.결과표명,SiR_4N대Pu(Ⅳ)적흡부등온선기본부합Langmuir흡부등온선,흡부위방열반응,ΔH＝-7.23 kJ/mol.궤리연구결과표명,분배비D여수지공능기단SiR_4N~+적관계식위:lg D=3.43+1.74lg n(SiR_4N~+),기배위비접근우2,유차가추측SiR_4N재초산용액체계주요흡부적시[Pu(NO_3)_6]~(2-).
The adsorption performance and mechanism of silica-based quaternary ammonium material (SiR_4N) were investigated by adsorption of Pu(Ⅳ) in 4 mol/L nitric acid solution. The adsorption isotherm of Pu(Ⅳ)on SiR_4N could be simulated well using Langmuir isotherm. According to Clausius-Claperon equation, adsorption heat estimated from the slope of ln K_d vs 1/T plot is ΔH＝-7.23 kJ/mol, which is exothermic reaction. Distribution ratios (D) and the amount of functional group can be expressed as lg D=3.43+1.74lg n(SiR_4N~+), and the slope is close to 2. It is concluded that the adsorption of Pu(Ⅳ) on SiR_4N in nitric acid solution belongs to anion ion exchange, and most of ［Pu(NO_3)_6］~(2-) are absorbed on SiR_4N.