Journal of Ion Exchange

Show abstractHide abstract

A new separation and adsorption material for metal ions was synthesized. Certain kinds of solvent extraction reagents such as H₂bbpen or Schiff base were loaded onto a silica gel or combined banana fiber. The H₂bbpen derivatives of the reagent for solvent extraction, such as (N, N'-bis-(5-chloro-2-ydroxybenzyl)-N,N'-bis(2-methylpyridyl)-ethylenediamine) (H₂Clbbpen) were loaded onto silica gel which was introduced as octadecyl groups. Ga³⁺ and In³⁺ was extracted into 1,2-dichloroethane with H₂Clbbpen at acidic solution. The separation and adsorption materials carried out the adsorption of Ga³⁺ and In³⁺ in the acidic region as same as a result of the solvent extraction. The separation and adsorption materials that carried out the chemical bond of the Schiff base to banana fiber were synthesized. Transition metal ions can be adsorbed from weak acidic solution into banana fiber that was introduced as Schiff base. Cs⁺ and Sr²⁺ were also adsorbed by untreated banana fiber.

View full abstract

Download PDF (1691K)

One of the most important tasks for recovering living area contaminated by the accident at the Fukushima Daiichi Nuclear Power Station is to secure a safe water supply. Therefore, we developed a Cs adsorbent wherein ammonium 12-molybdophosphate (AMP) was loaded by radiation-induced graft polymerization on a fibrous trunk material and crosslinked to form a structure wherein the loaded AMP is stable. To optimize the synthesis of this Cs adsorbent, a 9G (G: dimethacrylate) polyethylene glycol dimethacrylate (PEGDM) was used as a crosslinking reagent and the adding volume was adjusted to 1mol% in a monomer solution to synthesize the Cs adsorbent with a 200% degree of grafting. Our evaluation of the adsorption performance of the Cs adsorbent indicates that it can be applied to a standard pH range for drinking water (from pH 5.8 to 8.6) and captures sufficient Cs, even in a solution containing 1mg/L of K, Ca, Mg, and Na ions, to yield a Cs concentration comparable to that of stream water.

View full abstract

Register with J-STAGE for free!