Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-11-26T12:42:20.575Z Has data issue: false hasContentIssue false
  • English
  • Français

Surface Charge Variation in Aging Ferric Hydroxide

Published online by Cambridge University Press:  01 July 2024

R. W. Lahann
R. W. Lahann*
Affiliation:
Department of Geological Sciences, State University of New York at Binghamton, Binghamton, NY 13901, USA
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The variation with time of exchangeable surface charge of amorphous ferric hydroxide in aqueous suspension was monitored by a titration technique. After 120 days, the surface charge of suspensions with initial pH from 8.5 to 10.5 was about one-fourth of the initial value, and goethite had formed from the ferric hydroxide. After the same time interval, the exchangeable surface charge of suspensions with initial pH from 5.5 to 8.0 was about two thirds the original value and the ferric hydroxide was still largely amorphous. The initial rate of crystallization and surface charge reduction increased with initial pH for suspensions with pH from 8.5 to 10.5, whereas the rate of surface charge reduction appeared to be independent of pH for suspensions with initial pH between 5.5 and 8.0. Based on these results it is suggested that at pH from 8.5 to 10.5 ferric hydroxide ages to goethite via a solution stage involving the Fe(OH)4- ion, whereas at pH values below 8.5 ferric hydroxide aging proceeds via mechanisms which do not involve the particle surface or bulk solution.

Type
Research Article
Information
Clays and Clay Minerals , Volume 24 , Issue 6 , December 1976 , pp. 320 - 326
Copyright
Copyright © 1976 The Clay Minerals Society

References

American Public Health Association (1971) Standard Methods for the Examination of Waste and Wastewater, 13th Edn, APHA, New York.Google Scholar
Atkinson, R. J., Posner, A. M. and Quirk, J. P. (1967) Adsorption of potential-determining ions at the ferric oxide-aqueous electrolyte interface: J. Phys. Chem. 71, 550–558.CrossRefGoogle Scholar
Black, A. P. (1967) Electrokinetic characteristics of hydrous oxides of aluminum and iron in Principles and Applications of Water Chemistry (Edited by Faust, S. D. and Hunter, J. V.) . Wiley, New York.Google Scholar
Fischer, W. R. and Schwertmann, U. (1975) The formation of hematite from amorphous iron (III) hydroxide: Clays & Clay Minerals 23, 33–37.CrossRefGoogle Scholar
Fripiat, J. J. and Pennequin, M. (1965) Evolution de la composition et du poids moléculair des hydroxydes d'aluminium et de fer purifiés par dialyse: Bull. Soc. chim. Fr. 244, 1655–1660.Google Scholar
Gastuche, M. C. (1964) The octahedral layer: 12th Nat. Cong. Clays & Clay Mins., pp. 471–493.Google Scholar
Gastuche, M. C., Bruggenwert, T. and Mortland, M. M. (1964) Crystallization of mixed iron and aluminum gels: Soil Sci. 98(5), 281–289.CrossRefGoogle Scholar
Hingston, F. J., Atkinson, R. J., Posner, A. M. and Quirk, J. P. (1968) Specific adsorption of anions on goethite: 9th. Int. Con. Soil. Sci. Trans., pp. 669–667.Google Scholar
Landa, E. R. and Gast, R. G. (1973) Evaluation of crystallinity in hydrated ferric oxides: Clays & Clay Minerals 21, 121–130.CrossRefGoogle Scholar
MacKenzie, R. C. (1957) The Differential Thermal Investigation of Clays. Mineralogical Society, London.Google Scholar
MacKenzie, R. C. and Meldau, R. (1959) The aging of sesquioxide gels—I. Iron oxide gels: Mineralog. Mag. 32, 153–165.Google Scholar
Parks, G. A. (1965) The isoelectric points of solid oxides, solid hydroxides and aqueous hydroxo complex systems: Chem. Rev. 65, 177–198.CrossRefGoogle Scholar
Parks, G. A. (1967) Aqueous surface chemistry of oxides and complex oxide minerals. Equilibrium Concepts in Natural Water Chemistry (Edited by Gould, R. F.) . Adv. Chem. Ser. 67.Google Scholar
Parks, G. A. and DeBruyn, P. L. (1962) The zero-point-of-charge of oxides: J. Phys. Chem. 66, 967–973.CrossRefGoogle Scholar
Schellman, W. (1959) Experimentelle Untersuchungen über die sedimentaire bildung von Goethite und Hematit: Chemie Erde 20, 104–135.Google Scholar
Schwertmann, U. (1969) Die Bildung von Eisenoxidmineralen: Fortschr. Miner. 46, 274–285.Google Scholar
Schwertmann, U. and Fischer, W. R. (1966) Zur Bildung von α-FeOOH und α-Fe2O3 aus amorphen Wisen (III)-hydroxide: Z. anorg. allg. Chem. 346, 137–142.CrossRefGoogle Scholar
Schwertmann, U. and Fischer, W. R. (1973) Natural ‘amorphous’ ferric hydroxide: Geoderma 10, 237–247.CrossRefGoogle Scholar