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摘要
A hydrogen type 732 cation-exchange resin (732-CR) was investigated for its ion-exchange behavior with Cu2+ and Ni2+ in aqueous solutions. The ion-exchange isotherm studies show a well fit with the Langmuir model, indicating a monolayer sorption mechanism and a maximum ion-exchange capacity (q(m)) of 1.736 mmol.g(-1) for Cu2+ and 2.876 mmol.g(-1) for Ni2+ at 308 K, respectively. The hydrated structures were proposed to explain the difference in q(m) between Cu2+ and Ni2+. The results show a two-shell six-coordinated-hydrate with eight water molecules for Cu2+ and an octahedral six-coordinated-hydrate with six water molecules for Ni2+ are the effective components for ion exchange. The thermodynamic parameters were calculated to show that the ion-exchange process is favorable, exothermic and spontaneous.
- 出版日期2017-10
- 单位华东理工大学
