氨基膦酸树脂吸附钴的研究

Cobalt Sorption With Amino Methylene Phosphate Resin

研究氨基膦酸树脂在HAc NaAc缓冲体系中对钴离子的吸附及解吸行为。在pH =5 73时吸附效果最佳 ,静态饱和吸附容量为 12 7mg·g- 1 (树脂 ) ,用 1 0～ 4 0mol·L- 1 HCl可定量洗脱 ,吸附速率常数为 4 17× 10 - 5s- 1 ,表观活化能为 2 3 9kJ·mol- 1 。吸附过程服从Freundlich经验式 ,ΔH =11 3kJ·mol- 1 ,ΔG =-1 62kJ·mol- 1 ,ΔS=43 3J·mol- 1 ·K- 1 ,功能基与Co2 +摩尔比约为 1∶1。树脂功能基中的氮、氧原子与Co2 +配位成键 ,P

The sorption behavior and mechanism of Amino Methylene Phosphate Resin (APAR) for Co(Ⅱ) is investigated. The optimal result is obtained in the HAc NaAc medium at pH=5.73. The statically saturated sorption capacity is 127mg·g -1 ·resin. Co(Ⅱ)adsorbed on APAR can be stripped quantitatively by using 1 0～4 0mol·L -1 hydrochloric acid. The apparent rate constant and activation energy are 4 17×10 -5 s -1 and 23 9 kJ· mol -1 , respectively. The sorption process of APAR for Co(Ⅱ) is consonant with the Freundlich isotherm equation. The sorption thermodynamic parameters, ΔH, andΔG are 11 3, -1 62 kJ·mol -1 respectively, ΔS is 0 0433 kJ·mol -1 ·K -1 . The coordination molar ratio of the functional group of APAR to Co(Ⅱ) is nearly 1:1. The N and O atoms in the functional group of APAR are complexed with the Co(Ⅱ) ions, and the H atom in the P-OH is exchanged with the Co(Ⅱ) ion.