摘要
研究氨基膦酸树脂吸附Eu3 + 的性能及其机理。溶液体系采用HAc -NaAc缓冲溶液 ,解吸剂采用 2 0mol·L- 1 的HCl溶液。结果表明 :氨基膦酸树脂对Eu3 + 的吸附在pH =5 7时最佳 ,2 5℃时静态饱和吸附容量为 2 48mg/g树脂 ;用 2 0mol·L- 1HCl解吸率为 89 3 % ;等温吸附服从Freundlich经验式 ;吸附的热焓为ΔH0 =41 0kJ·mol- 1 ,APAR对Eu3 + 的表观吸附活化能为2 3 3kJ·mol- 1 ;树脂功能基与Eu3 + 的配位比为 2∶1。用化学法和红外光谱等探讨了吸附机理 ,树脂功能基中的N原子与O原子与Eu3 + 配位成键形成配合物。用氨基膦酸树脂吸附Eu3 +
The ability and mechanism of Eu 3+ adsorption with amino metylene phosphonic acid resin(APAR)is investigated by using chemical method and IR spectrometry.Eu 3+ is optimally adsorbed by amino methylene phosphonic acid resin in a medium of pH=5 7;the statically saturated adsorption capacity at 25℃ is 248mg/g·resin.The elution rate of Eu 3+ adsorbed on APAR is 89 3% with 2 0mol·L -1 HCl.The adsorption behavior of APAR for Eu 3+ coincides with the Freundlich isotherm formula.The adsorption entrapy change of APAR for Eu 3+ is 41 0kJ·mol -1.The apparent adsorption activation energy of APAR for Eu 3+ is 23 3kJ·mol -1.The coordination molar ratio of the functional group of APAR to Eu 3+ is 2∶1.The adsorption mechanism of APAR for Eu 3+ is examined by using chemical method and IR spectrometry.The complex compound forms by combination of N and O atoms in the functional group of APAR and Eu 3+.
出处
《有色金属》
CSCD
2001年第3期13-16,共4页
Nonferrous Metals
基金
浙江省高校中青年学科带头人基金资助项目 ( 972 11)
关键词
铕
氨基磷酸脂
吸附机理
湿法冶金
amino methylene phosphonic acid resin
europium
sorption mechanism
