Coordination kinetics of different modified polyacrylonitrile fibers and Fe~(3+)

To optimize the preparation of the modified polyacrylonitrile( PAN) fiber-Fe complexes,low and high conversion amidoxime modified PAN fibers( L-AO-PAN) and( H-AO-PAN) and mix modified PAN fibers( M-PAN) were used to coordinate with Fe3 +,respectively,to produce the modified PAN fiberFe complexes. The kinetics of the coordination of the three different modified PAN fibers and Fe3 +were studied,and their kinetic parameters were compared. The results indicated that the coordination of the three modified PAN fibers and Fe3 +is consistent with the first order kinetic model,and well described by Langmuir adsorption model. The saturated coordinate capacity,reaction rate constant and activation energy of H-AO-PAN to Fe3 +were higher than those of L-AO-PAN or M-PAN to Fe3 +. Raising the temperature benefits the coordination of the three different modified PAN fibers,especially H-AO-PAN and Fe3 +.