REMOVAL OF NO BY COORDINATION TO IRON(II) IMMOBILIZED CHELATE RESINS

The equilibrium constants for coordination of NO to the resin-immobilized Fe(II) complex in an aqueous slurry and to the iminodiacetato-Fe(II) complex in an aqueous solution were measured at different pHs and temperatures. The equilibrium constant in the resin phase was about 1/ 20th of that in the liquid phase but is still about 20 times as large as that in the absence of iminodiacetic acid. It is difficult to avoid oxidation of Fe(II) in the course of thermal regeneration of spent Fe(II) immobilized chelate resins, so it seems to be more realistic to recover only chelate resins from spent absorbent and immobilize Fe(II) again to them. © 1990, American Chemical Society. All rights reserved.