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Report No.

Adsorption properties of styrenesulfonate-grafted fibrous metal adsorbent

Ueki, Yuji; Saiki, Seiichi; Seko, Noriaki

The dynamic adsorption/elution properties of an ethyl p-styrenesulfonate (EtSS)-based fibrous graft adsorbent having sulfonic acid (SO$$_{3}$$H) groups were evaluated by column-mode adsorption/elution tests for various cations. The EtSS-based fibrous graft adsorbent could work to capture various cations rapidly even under high flow rate conditions, compared with a commercial granular resin. The reason for this difference of adsorption rates was thought to be that the target ions were easily and rapidly transported near the SO$$_{3}$$H groups of graft chains by fluid convection. The affinity order of the fibrous graft adsorbent for cations depended on the cationic size and valence. It was found that the EtSS-based fibrous graft adsorbent preferentially adsorbed more multiply-charged cations having a larger cationic radius. The adsorbed cations could be easily eluted and concentrated by 1 M HNO$$_{3}$$ aqueous solution, and the recovery of each cation was reached over 90%. Based on the above results, it was found that the EtSS-based fibrous graft adsorbent could be available as a sophisticated metal adsorbent in the industrial processes.



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