C-800氨基羧酸树脂对铬(Ⅲ)的吸附性能研究

STUDIES ON THE ADSORPTION OF C-800 AMINOCARBOXYLIC ACID RESIN FOR Cr(Ⅲ)

研究了C-800树脂对Cr(Ⅲ)离子的吸附性能。结果表明,在pH=4.0时树脂对Cr(Ⅲ)的吸附效果最佳,等温吸附服从Freundlich经验式,静态饱和吸附容量为212.4 mg/g,吸附反应的表观活化能Ea=27.1 kJ/mol,热力学函数ΔH=7.39 kJ/mol,ΔG298=-2.65 kJ/mol。用2 mol/L盐酸溶液能定量洗脱。树脂功能基上的N与Cr(Ⅲ)发生配位键合,配位摩尔比为2:3。

The adsorption properties of C-800 resin for Cr （ Ⅵ） were studied. Experimental results showed that C-800 resin has a good adsorption ability for Cr（ Ⅲ） at pH = 4. 0 in the HAc - NaAc mediurm. The adsorption behavior of resin for Cr （ Ⅲ ） is in accord with Freundlich adsorption isotherm. The statically saturated adsorption capacity is 212. 4 mg/g resin. The apparent activation energy of adsorption reaction, Ea ,is 27.1 kJ/mol, and the thermodynamic parameters are △H = 7.39 kJ/mol, and △G298 = -2. 65 kJ/mol. Cr （ Ⅲ ） adsorbed on resin can be eluted by 2 mol/L hydrochloric acid on a quantitative basis. Infrared spectra and adsorption mechanism showed that the functional group of resin is coordinated with Cr（ Ⅲ ） to form a co-ordination compound. The coordination molar ratio of the functional group of resin to Cr（ Ⅲ ） is 2：3 .