Hydroxynaphthoic acid isomer sorption onto goethite.

ABSTRACT: This study used batch and attenuated total reflectance-Fourier-transform infrared (ATR-FTIR) flow-through techniques, along with computational chemistry, to probe the sorption of hydroxynaphthoic acid (HNA) isomers at the goethite-water interface. The HNA isomers employed in this study, 1-hydroxy-2-naphthoic acid and 2-hydroxy-3-naphthoic acid, possessed an intramolecular hydrogen bond (IHB) between their carboxyl and hydroxyl groups, which resulted in coupled vibrational modes. Complimentary information from batch and ATR-FTIR studies suggested surface complexation via a bidentate structure, involving both the carboxylate and phenolate groups, as the dominant mode of sorption. A secondary HNA surfaces species noted only at pH 4 appeared to sorb via the carboxylate group, with the phenolic

SUBMITTER: Cooper EM 

PROVIDER: S-EPMC3638210 | biostudies-literature | 2009 May

REPOSITORIES: biostudies-literature