TY  - JOUR
A1  - Demetriou, Antri
A1  - Pashalidis, Ioannis
A1  - Nicolaides, Athanassios V.
A1  - Kumke, Michael Uwe
T1  - Surface mechanism of the boron adsorption on alumina in aqueous solutions
JF  - Desalination and water treatment : science and engineering
N2  - 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.
KW  - Boric acid
KW  - Alumina
KW  - Raman spectroscopy
KW  - DFT calculations
KW  - Surface complexes
KW  - Formation constant
Y1  - 2013
U6  - https://doi.org/10.1080/19443994.2013.764354
SN  - 1944-3994
SN  - 1944-3986
VL  - 51
IS  - 31-33
SP  - 6130
EP  - 6136
PB  - Taylor & Francis Group
CY  - Philadelphia
ER  -