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A study of adsorption and absorption mechanisms of copper in palygorskite

Published online by Cambridge University Press:  09 July 2018

Y. F. Cai  and
J. Y. Xue
Y. F. Cai*
Affiliation:
State Key Laboratory of Mineral Deposits Research, Nanjing University, Nanjing, 210093, P. R. China Department of Earth Sciences, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210093, P. R. China
J. Y. Xue
Affiliation:
Department of Earth Sciences, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210093, P. R. China
*
*E-mail: [email protected]
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Abstract

Desorption experiments performed on four Cu-adsorbed palygorskites suggest that the leached Cu2+ ion originates at the surface and/or net-like interstice of the palygorskite fibres. The leached fraction, calculated from the quantities of adsorbed Cu2+ before and after desorption, is <1%. This may indicate that the majority of Cu is in inaccessible structural sites. X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared (FTIR) spectroscopy and electron spin resonance (ESR) were used to determine the mineralogical character of the Cu-adsorbed palygorskite. Two photoelectron lines at 932.5 and/or 933.7 eV in the narrow scan Cu 2p3/2 spectra show that Cu adsorbed on the surface of palygorskite is in the Cu+ and Cu2+ state. The stretching vibrations of the octahedral cation shift ~3–5 cm–1 towards a greater wavenumber in the FTIR spectra of Cu-adsorbed palygorskite. It can be deduced that the Cu2+ is trapped in the channel of the palygorskite structure. The ESR spectra of the palygorskite give g values of 2.34, 2.12, 2.08 and 2.05, suggesting that some Cu ions cannot be reached by H+. These results confirm that Cu is adsorbed by palygorskite via three possible mechanisms: (1) the Cu is adsorbed onto the surface or in a net-like interstice, and its oxidation states are +1 and +2; (2) Cu forms a complex ion – [Cu(H2O)4]2+ or [Cu(H2O)6]2+, and is trapped in the channel; or (3) Cu enters into the hexagonal channel of the tetrahedral sites or the unoccupied octahedral sites of palygorskite.

Keywords

palygorskiteCuadsorbed siteadsorptionabsorptionXPSFTIRESRXRD
Type
Research Article
Information
Clay Minerals , Volume 43 , Issue 2 , June 2008 , pp. 195 - 203
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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