Fine Fibrous Amidoxime Adsorbent Synthesized by Grafting and Uranium Adsorption-Elution Cyclic Test with Seawater

Fibrous amidoxime adsorbents were prepared by radiation-induced co-grafting of acrylonitrile (AN) and methacrylic acid (MAA) and subsequent amidoximation. Adsorption of uranium in seawater was evaluated by pumping seawater into the adsorbent column. The best monomer ratio of AN and MAA was 7:3 for c...

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Published inSeparation science and technology Vol. 39; no. 16; pp. 3753 - 3767
Main Authors Seko, Noriaki, Katakai, Akio, Tamada, Masao, Sugo, Takanobu, Yoshii, Fumio
Format Journal Article
LanguageEnglish
Published Taylor & Francis Group 01.01.2004
Subjects
Adsorption
Alkaline treatment
Amidoxime adsorbent
Co-grafting
Cyclic test
Tartaric acid
Uranium
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Summary:Fibrous amidoxime adsorbents were prepared by radiation-induced co-grafting of acrylonitrile (AN) and methacrylic acid (MAA) and subsequent amidoximation. Adsorption of uranium in seawater was evaluated by pumping seawater into the adsorbent column. The best monomer ratio of AN and MAA was 7:3 for continual usage of uranium adsorption. Though hydrochloric acid is an effective eluting agent for the metals adsorbed on the adsorbent, amidoxime groups were simultaneously damaged after five cycles of adsorption-desorption. This deterioration was reduced by an alkaline treatment of the adsorbents after each elution. Furthermore, various organic acids were examined as elution agents. It was found that the 80% of adsorption activity was still maintained after five cycles of adsorption-desorption when tartaric acid was used for eluting agent.
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ISSN:0149-6395
1520-5754
DOI:10.1081/SS-200042997