Preparation of Amidoxime-Fiber Adsorbents Based on Poly(Methacrylonitrile) for Recovery of Uranium from Seawater∗
Makaleler > Tam Makale · 1994
Yazarlar: Nalan Kabay
Separation Science and Technology, Uluslararası, 1994, cilt 29, ss 375-384
DOI: 10.1080/01496399408002489
Özet
Polymerization of methacrylonitrile was performed with anionic initiators as reported in the literature. The molecular weight of the polymer produced using BuLi as initiator at 0 ± 2°C was on the order of 105. Maximum conversion was 97% with BuLi initiator. For comparison, methacrylonitrile was polymerized with diethylmagnesium in dioxane at 70°C. High-molecular weight polymers with 50–60% conversions were produced by diethylmagnesium initiator. The polymethacrylonitrile obtained by BuLi initiator was used for the fiber production process. The conversion of nitrile was performed by treatment with 3% NH2OH in MeOH at 80°C. The amidoxime-fiber adsorbent gave a large adsorption rate, such as 176 μg of U/g of adsorbent/day, in a batchwise seawater adsorption test.