Adsorption of rhenium(VII) on 4-amino-1,2,4-triazole resin

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• 作者：Chunhua Xiong ; Caiping Yao ; Xiangmei Wu
• 关键词：4-amino-1 ; 2 ; 4-triazole resin ; Rhenium(VII) ; Kinetics ; Adsorption
• 刊名：Hydrometallurgy
• 出版年：2008
• 出版时间：February 2008
• 年：2008
• 卷：90
• 期：2-4
• 页码：221-226
• 全文大小：234 K

文摘

The adsorption properties of 4-amino-1,2,4-triazole resin (4-ATR) for Re(VII) were investigated by static and dynamic adsorption–desorption measurements with ultraviolet–visible spectroscopy. The influence of conditions such as temperature, initial solution pH and contact time on the adsorption curve was studied. It was found that the 4-amino-1,2,4-triazole resin was suitable for adsorption of Re(VII). The saturated adsorption capacity was 354 mg·g^{− 1}resin at pH 2.6 in HAc–NaAc medium at 298 K. The adsorption rate constant was k₂₉₈ = 8.2 × 10^{− 5} s^{− 1}. The adsorption behavior of 4-ATR for Re(VII) obeyed the Freundlich empirical equation; whilst changes in adsorption with temperature gave an enthalpy change ΔH = − 11.8 kJ·mol^{− 1}. The molar ratio of the functional group of 4-ATR to Re(VII) was about 2:1. Re(VII) adsorbed on 4-ATR was eluted by 1.0 ~ 5.0 mol·L^{− 1} HCl with 100 % quantitative elution in 4.0 mol·L^{− 1} HCl solution. The resin can be regenerated and reused without apparent decrease in adsorption capacity.