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Surface mechanism of the boron adsorption on alumina in aqueous solutions

  • 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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Author:Antri Demetriou, Ioannis Pashalidis, Athanassios V. Nicolaides, Michael Uwe KumkeORCiDGND
ISSN:1944-3994 (print)
ISSN:1944-3986 (online)
Parent Title (English):Desalination and water treatment : science and engineering
Publisher:Taylor & Francis Group
Place of publication:Philadelphia
Document Type:Article
Year of first Publication:2013
Year of Completion:2013
Release Date:2017/03/26
Tag:Alumina; Boric acid; DFT calculations; Formation constant; Raman spectroscopy; Surface complexes
First Page:6130
Last Page:6136
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie
Peer Review:Referiert