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Journal Articles

Adsorption efficiency of a new adsorbent towards uranium and vanadium ions at low concentrations

Kavakli, P. A.*; Seko, Noriaki; Tamada, Masao; G$"u$ven, O.*

Separation Science and Technology, 39(7), p.1631 - 1643, 2005/00

 Times Cited Count:52 Percentile:84.2(Chemistry, Multidisciplinary)

A new type of fibrous adsorbent with excess amidoxime groups was synthesized by radiation-induced graft polymerization. Glycidyl methacrylate (GMA) was first radiation-grafted on polyethylene-coated polypropylene nonwoven fabrics and chemically modified with 3,30-iminodipropionitrile [NH (-CH$$_{2}$$-CH$$_{2}$$-CN)$$_{2}$$] (IDPN), which was further reacted with hydroxylamine to obtain graft chains containing two amidoxime groups per graft repeating units. The adsorption properties of this new adsorbent for uranium (U), vanadium (V), lead (Pb), copper (Cu), and cobalt (Co) ions at low concentrations (3.3-1000 ppb).

Journal Articles

Rapid removal of arsenic(V) by zirconium(IV) loaded phosphoric chelate adsorbent synthesized by radiation induced graft polymerization

Seko, Noriaki; Basuki, F.*; Tamada, Masao; Yoshii, Fumio

Reactive and Functional Polymers, 59(3), p.235 - 241, 2004/07

 Times Cited Count:52 Percentile:83.84(Chemistry, Applied)

Fibrous arsenic(As) adsorbent was synthesized by loading zirconium(Zr) on fibrous phosphoric adsorbent which was directly synthesized by radiation-induced grafting of 2-hydroxyethyl methacrylate phosphoric acid on polyethylene-coated polypropylene nonwoven fabric. Zirconium reacted with phosphoric acid grafted in the polyethylene layer. Zirconium density of the resulting adsorbent was 4.1 mmol/g. The breakthrough curve of As(V) adsorption was independent of the flow rate up to 1300 h$$^{-1}$$ in space velocity. The total capacity of As(V) was 2.0 mmol/ g-adsorbent at pH of 2. The adsorbed Zr(IV) could be evaluated by 0.4 M sodium hydroxide solution because no Zr(IV) could be found in the eluted solution. Anions of chloride and nitrate interfered the breakthrough capacity.

Oral presentation

Alkaline durable 2-methyl-1-vinylimidazolium-based anion exchange membranes prepared by radiation-induced grafting for hydrazine hydrate fuel cells

Yoshimura, Kimio; Koshikawa, Hiroshi; Yamaki, Tetsuya; Shishitani, Hideyuki*; Yamaguchi, Susumu*; Tanaka, Hirohisa*; Maekawa, Yasunari

no journal, , 

Since anion-conducting electrolyte membrane fuel cells (AEMFCs) such as direct hydrazine fuel cells operated under high temperature and highly basic condition, it is required to develop alkaline durable AEMs. In this work, we synthesized AEM with poly 2-methyl-1-vinylimidazolium grafts by radiation-induced graft coplymerizaiton to protect 2-position of imidazolium ring from alkaline hydroxide ion attack. The AEM with an ion-exchange capacity (IEC) of 1.80 mmol g$$^{-1}$$ exhibited ionic conductivity of 123 mS cm$$^{-1}$$ at 60$$^{circ}$$C. The durability of the membrane was evaluated. The excellent long-term alkaline stability of the prepared AEM was confirmed in 1M KOH at 80$$^{circ}$$C. Therefore, the protection of 2-position by methyl group suppresses ring opening degradation reactions, resulting in the improvement of the alkaline durability of imidazolium-type AEMs.

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