Absorption of nitric oxide into aqueous solutions of [feii(edta)]2- with sodium hypophosphite and reduction kinetics of [feiii(edta)]- by sodium hypophosphite

Abstract

The absorption of NO into aqueous solutions of [FeII(EDTA)]2-and sodium hypophosphite was carried out in a bubble reactor and sodium hypophosphite was used as a reductant to reduce [FeIII(EDTA)]-generated by [FeII(EDTA)]2-oxidation. The results show that sodium hypophosphite can effectively reduce the [FeIII(EDTA)]-and improve the absorption efficiency of NO. The reduction rate of [FeIII(EDTA)]-increases with the increase in temperature and pH. The stoichiometry and reduction kinetics of [FeIII(EDTA)]by sodium hypophosphite was achieved according to the influence of different sodium hypophosphite concentrations, temperature, and pH on the reduction rate. The activation energy of reducing [FeIII(EDTA)]-by sodium hypophosphite is calculated to be 33.172 kJ/mol. The reduction kinetics of [FeIII(EDTA)]-by sodium hypophosphite in the air was obtained, and the agreement between the experimental results and simulation results was excellent.