REACTIVITY OF FERRATE(V) WITH CARBOXYLIC-ACIDS - A PRE-MIX PULSE-RADIOLYSIS STUDY Academic Article uri icon

abstract

  • Rates of reduction of ferrate(VI) to ferrate(V) by a number of organic acid and ester radicals (monocarboxylic acids, dicarboxylic acids, amino acids, malonic acid esters), generated by the pulse radiolysis technique, vary from 107-109 dm3 mol-1 s-1. The rate at which these radicals reduce ferrate(VI) depends upon the nature of the substituents at the -carbon atom and decrease in the order - C-NH2>-C-OH>-C-H.A similar dependence upon the -C-groups(s) has been observed for the oxidation of the parent organic acid by ferrate(V), for which the rate constants vary from 101-106 dm3 mol-1 s-1. An oxidation mechanism is being proposed in which ferrate(V) oxidizes the carboxylic acid by a two-electron process. The rate of the oxidation process is dependent on the protonation of ferrate(V). For example, in the oxidation of gluconic acid with H2FeVO4-/HFeVO42-; k10(H2FeVO4- + gluconate) = 1.1 106 dm3 mol-1 s-1 and k11(HFeVO42- + gluconate) = 2.0 105dm3 mol-1 s-1. The oxidation mechanisms for malate and asparate by OH radicals and ferrate(V) are compared. 1994.

published proceedings

  • RADIATION PHYSICS AND CHEMISTRY

author list (cited authors)

  • BIELSKI, B., SHARMA, V. K., & CZAPSKI, G.

citation count

  • 69

complete list of authors

  • BIELSKI, BHJ||SHARMA, VK||CZAPSKI, G

publication date

  • November 1994