A novel solution for hydroxylated PAHs removal by oxidative coupling reaction using Mn oxide.
In this study, removals of 1-naphthol by oxidative-coupling reaction using birnessite, one of the natural Mn oxides present in soil, was investigated in various experimental conditions (reaction time, Mn oxide loadings, pH). The removal efficiency of 1-naphthol by birnessite was high in all the experimental conditions, and UV-visible and mass spectrometric analyses on the supernatant after reaction confirmed that the reaction products were oligomers formed by oxidative-coupling reaction. Pseudo-first order rate constants, k, for the oxidative transformation of 1-naphthol by birnessite was derived from the kinetic experiments under various amounts of birnessite loadings, and using the observed pseudo-first order rate constants with respect to birnessite loadings, the surface area normalised specific rate constant, k(surf), was also determined to be 9.3 x 10(-4) (L/m(2).min) for 1-naphthol. In addition, the oxidative transformation of 1-naphthol was found to be dependent on solution pH, and the pseudo-first order rate constants were increased from 0.129 at pH 10 to 0.187 at pH 4.
Kang
Ki-Hoon
KH
Technology Research Institute, Daelim Industrial Co. Ltd., Seoul, Korea. khkang@daelim.co.kr
Lim
Dong-Min
DM
Shin
Hyun-Sang
HS
D002851:Chromatography, High Pressure Liquid; D002853:Chromatography, Liquid; D007202:Indicators and Reagents; D007700:Kinetics; D017895:Manganese Compounds; D013058:Mass Spectrometry; D009284:Naphthols; D010084:Oxidation-Reduction; D010087:Oxides; D011084:Polycyclic Aromatic Hydrocarbons / Q000302:isolation & purification*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D018508:Water Purification / Q000379:methods
D007202:Indicators and Reagents; D017895:Manganese Compounds; D009284:Naphthols; D010087:Oxides; D011084:Polycyclic Aromatic Hydrocarbons; C505018:birnessite; C029350:1-naphthol; C027424:manganese oxide