Journal
DESALINATION AND WATER TREATMENT
Volume 51, Issue 31-33, Pages 6130-6136Publisher
DESALINATION PUBL
DOI: 10.1080/19443994.2013.764354
Keywords
Boric acid; Alumina; Raman spectroscopy; DFT calculations; Surface complexes; Formation constant
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The adsorption of boron (boric acid) from aqueous solutions on alumina has been investigated at pH 8.0, I=0.1M NaClO4, T=22 +/- 3 degrees C, and under normal atmospheric conditions. The characterization of the adsorbed species was performed by Raman spectroscopy and the spectroscopic speciation was assisted by theoretical DFT calculations. Evaluation of the spectroscopic data points to the formation of inner-sphere surface complexes and indicates the formation of two different types of adsorbed boron species. The theoretical calculations corroborate the spectroscopic data and indicate that at low boron concentration the monodentate surface species dominates, whereas increased boron concentration favors the formation of a bidentate surface species. Assuming low coverage, the conditional formation constant for the monodentate surface species has been evaluated to be log=4.1 +/- 0.1.
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