Binding mechanism of arsenate on rutile (110) and (001) planes studied using grazing-incidence EXAFS measurement and DFT calculation

Zhang, M, He, G and Pan, G ORCID: https://orcid.org/0000-0003-0920-3018, 2015. Binding mechanism of arsenate on rutile (110) and (001) planes studied using grazing-incidence EXAFS measurement and DFT calculation. Chemosphere, 122, pp. 199-205. ISSN 0045-6535

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Abstract

Characterization of contaminant molecules on different exposed crystal planes is required to conclusively describe its behavior on mineral surfaces. Here, the structural properties and relative stability of arsenate adsorbed on rutile TiO2 (110) and (001) surfaces were investigated using grazing-incidence extended X-ray absorption fine structure (GI-EXAFS) spectra and periodic density functional theory (DFT) calculation. The combined results indicated that arsenate mainly formed inner-sphere bidentate binuclear (BB) and monodentate mononuclear (MM) complexes on both surfaces, but the orientational polar angles of arsenate on the (110) surface were commonly smaller than that on the (001) surface for the two adsorption modes. The DFT calculation showed that the (110) plane had a higher affinity toward arsenate than the (001) plane, suggesting that, for a given adsorption mode (i.e., MM or BB structure), a small polar angle was more favorable for arsenate stabilized on the rutile surfaces.

Item Type:	Journal article
Publication Title:	Chemosphere
Creators:	Zhang, M., He, G. and Pan, G.
Publisher:	Pergamon Press
Date:	March 2015
Volume:	122
ISSN:	0045-6535
Identifiers:	Number Type 10.1016/j.chemosphere.2014.11.053 DOI
Divisions:	Schools > School of Animal, Rural and Environmental Sciences
Record created by:	Jonathan Gallacher
Date Added:	13 Jun 2016 07:46
Last Modified:	09 Jun 2017 14:03
URI:	https://irep.ntu.ac.uk/id/eprint/27960

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