Amidoxime fibers

T. Kato, T. Kago, K. Kusakabe, S. Morooka and H. Egawa, Preparation of Amidoxime Fibers for Recovery of Uranium from Seawater, J. Chem. Eng. Japan, 23 (1990) 744. 

Industrial applications include ion-exchange fibers, made by treating acrylic fiber with NH2OH and NaOH to produce amidoxime fiber, used for removing uranium from seawater [576,577], and hydrazine-treated acrylic fibers have been used for removal of other heavy metals [578]. Fundamental studies of treatment methods have also appeared in the literature [579,580,581-584]. 

Kago, T., et al.. Preparation and performance of amidoxime fiber adsorbents for recovery of uranium from seawater, Ind. Eng. Chem. Res., 31(1), 204-209 (1992). 

Kabay, N., Preparation of amidoxime-fiber adsorbents based on poly(methacrylonitrile) for recovery of uranium from seawater, Sep. Sci. Technol., 29(3), 375-384 (1994). 

A recovery system for uranium in seawater using amidoxime (AO) fibers is promising in that the ocean current forces seawater to easily move through an adsorption bed charged with AO fibers. A research group at the Shikoku National Industrial Research Institute has... 

The amount of uranium adsorbed in the submerged mode of operation at an ocean site for 20 days of contact is shown in Figure 22 as a function of the weight ratio of AN to MAA in the monomer mixture. The AO fibers prepared by cografting MAA with AN at a weight ratio of AN to MAA of 60/40 and sub quent amidoximation exhibited a maximum... 

S. Katoh, K. Sugasaka, K. Sakane, N. Takai, H. Takahashi, Y. Umezawa and K. Itagaki, Enhancement of the Adsorptive Property of Amidoxime-Group-Containing Fiber by Alkaline Treatment, Nippon Kagaku Kaishi, (1982) 1455. 

K. Saito, K. Uezu, T. Hori, S. Furusaki, T. Sugo and J. Okamoto, Recovery of Uranium from Seawater Using Amidoxime Hollow Fibers, AIChE J., 34 (1988) 411. 

Chen et al. (2009) functionahzed polyacrylonitrile (PAN) nanofibers so as to enable their use in the development of self-detoxifying chemical protection fabrics. The authors reacted PAN nanofibers with excess of hydroxylamine in methanol at 70 °C. The oximation of the nanofiber mats resnlted in the formation of polyaciylamidoxime on the snrface of the fibers. The authors proved that the functionalized nanofibers snccessfully hydrolyzed diisopropyl fluorophosphate (DFP) in the presence of water. The rate constant of the pseudo-first order reactions was found to increase with the presence of water in the nanofiber mats. According to the authors, the water in the mats facihtates the nucleophilic attack of amidoximes to accelerate the decomposition of DFP." ... 

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