Date of Award
Hematite, adsorbed Fe(II), adsorbed Fe(II) kinetics
The reaction of hexabromocyclododecane (HBCDD), a widely used brominated flame retardant, was studied in a heterogenous mixture containing reactive Fe(II) adsorbed to the iron oxide hematite. The adsorbed Fe(II)/iron oxide system has shown to be a potent reductant in the transformation of organic contaminants with relatively water soluble organic contaminants. There currently aren’t many studies involving hydrophobic organic contaminants, such as HBCDD, in this reducing Fe(II)/iron oxide system. The results indicate that across the pHs 6.86, 6.95, 7.15 and 7.35 γ and β-HBCDD are degraded within a couple days. The pseudo-first order rate constants at pH 6.95 are 0.049 hr-1 for β-HBCDD and 0.043 hr-1 γ-HBCDD, reaching their half-life within 15 hours of the reaction. These experiments also illustrate the isomers experience slightly different reactivities with different pHs with α-HBCDD reacting the slowest.
Roopnarine, Kristian K., "The study of the degradation of hexabromocyclododecane in a heterogeneous system containing Fe(II) adsorbed to the iron oxide Hematite." (2018). CUNY Academic Works.