TITLE:
Synthesis of Highly-Selective Fibrous Adsorbent by Introducing 2-Ethylhexyl Hydrogen-2-Ethylhexylphosphonate for Scandium Adsorption
AUTHORS:
Hiroyuki Hoshina, Yuji Ueki, Seiichi Saiki, Noriaki Seko
KEYWORDS:
Fibrous Adsorbent, Scandium, Radiation-Induced Graft Polymerization, Selective Adsorption, 2-Ethylhexyl Hydrogen-2-Ethylhexylphosphonate
JOURNAL NAME:
International Journal of Organic Chemistry,
Vol.4 No.3,
September
17,
2014
ABSTRACT: 2-ethylhexyl hydrogen-2-ethylhexylphosphonate (EHEP) is commonly used as a metal extractant because it has a particular affinity for rare-earth metals like Scandium (Sc). To develop a highly-selective adsorbent of Sc(III), EHEP was introduced as a functional group onto a polyethylene fabric with radiation-induced graft polymerization(RIGP). The adsorption performances for Sc(III) were evaluated with aqueous solutions containing Sc(III) and Fe(III) in bath and column tests. As a result of column test, the adsorption capacities of Sc(III) and Fe(III) until the bed volume reached 5000 were 5.22 and 0.12 mg/g, respectively. It means that the amount of collected Sc(III) by the EHEP adsorbent was approximately 44 times higher than that of Fe(III). These results indicate that the grafted adsorbent containing EHEP has an extremely high selectivity for Sc(III) adsorption.