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瀬古 典明; 天田 春代; 保科 宏行; 池川 淳史*; 畑中 宏支*
no journal, ,
Fibrous glucamine chelate adsorbent (GA) for boron removal was synthesized by pre-irradiation method of radiation-induced grafting of glycydyl methacrylate onto a nonwoven polyethylene fabric and the subsequent chemical modification. We have adopted the emulsion grafting technique which realized high yield of grafting degree in comparison with general organic solvent grafting system. Furthermore, the chemical modification solvent was also determined to be a water to minimize the environmental pollution. In the grafting process, the grafting degree (Dg) reached 221% at the minimized irradiation dose of 20 kGy for 1 h at 40C. To evaluate GA, the effect of the co-existence ions such neodymium (Nd) and dysprosium (Dy) on boron adsorption was investigated to determine the possibility of Nd/Dy recycle as industrial future resources. GA with 2.3 mmol/g-adsorbent was tested by batch mode adsorption of boron with Nd and Dy. As a result, the recovery of boron was more than 90% in the presence of extremely high concentrations of Nd and Dy.
保科 宏行; 瀬古 典明; 池川 淳史*; 畑中 宏支*
no journal, ,
2-Ethylhexyl hydrogen-2-ethylhexylphosphonate (EHEP) is commonly used as a metal solvent extraction because it has a particular affinity for rare-earth elements like dysprosium (Dy). To create an efficient adsorbent for Dy, EHEP was introduced by using the Radiation Induced Graft Polymerization (RIGP) technique into the polymeric material without changing its characteristics. In this study, the adsorbent for Dy recovery was prepared by RIGP of octadecyl methacrylate (OMA) onto a nonwoven fabric and subsequent introduction of EHEP. The EHEP was successfully introduced into the nonwoven fabric by hydrophobic interaction between the long-chain alkyl group in the OMA and that of EHEP by soaking the grafted fabric in the EHEP solutions. To evaluate the adsorption performance for Dy, column adsorption test was carried out with 1 mg/L of Dy solution at SV (Space Velocity) 250 h. As a result, more than 95% of Dy in the solution could be absorbed by the EHEP adsorbent until BV (Bed Volume) reached 1,000. This result established that the EHEP adsorbent could collect Dy effectively and has high adsorption capacity for Dy.