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Surface Charge Characteristics of Amorphous Aluminosilicates

Published online by Cambridge University Press:  01 July 2024

K. W. Perrott
K. W. Perrott*
Affiliation:
Soil and Field Research Organisation, Ruakura Agricultural Research Centre, Private Bag, Hamilton, New Zealand
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Abstract

The surface charge characteristics of a range of synthetic amorphous aluminosilicates, hydrous alumina, hydrous silica and two allophanic soil clays were determined by the retention of Na+ and Cl− as counter-ions from 0.1 M NaCl solution. In the pH range investigated (3–9), only negative charges could be detected in the hydrous silica and the most siliceous aluminosilicate [Al/(Al + Si) = 0.29], and only positive charges were detected in the hydrous alumina; whereas both positive and negative charges were detected in the more aluminous aluminosilicates and the soil allo-phanes. In all cases, the surface charges were pH-dependent and in the aluminosilicate series negative charge decreased and positive charge increased with Al/(Al + Si). Consequently, the point of zero charge increased with Al/(Al + Si).

The charge characteristics of the amorphous aluminosilicates could be explained by current models of their structure. Negative charge can be attributed to isomorphous substitution of Al for Si in the silicate structure and to the dissociation of silanol groups in structural and adsorbed silicate. Positive charge is attributed to protonation of hydroxy-aluminum species occupying cation exchange sites.

Type
Research Article
Information
Clays and Clay Minerals , Volume 25 , Issue 6 , December 1977 , pp. 417 - 421
Copyright
Copyright © Clay Minerals Society 1977

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References

Boar, P. L. and Ingram, L. K. (1970) The comprehensive analysis of coal ash and silicate rocks by atomic-absorption spectrophotometry by a fusion technique: Analyst 95, 124–130.CrossRefGoogle Scholar
Bolt, G. H. (1957) Determination of the charge density of silica sols: J. Phys. Chem. 61, 1166–1169.CrossRefGoogle Scholar
Chichester, G. W., Harward, M. E. and Youngberg, C. T. (1970) pH dependent ion exchange properties of soils and clays from Mazama pumice: Clays and Clay Minerals 18, 81–90.CrossRefGoogle Scholar
Cloos, P., Leonard, A. J., Moreau, J. P., Herbillon, A. and Fripiat, J. J. (1969) Structural organisation in amorphous silico-aluminas: Clays and Clay Minerals 17, 279–287.CrossRefGoogle Scholar
de Villiers, J. M. (1969) Pedosesquioxides—composition and colloidal interactions in soil genesis during the Quaternary: Soil Sci. 107, 454–461.CrossRefGoogle Scholar
de Villiers, J. M. and Jackson, M. L. (1967) Cation exchange capacity variations with pH in soil clays: Soil Sci. Soc. Am. Proc. 31, 473–476.CrossRefGoogle Scholar
Fey, M. V. and le Roux, J. (1976) Electric charges on sesquioxidic soil clays: Soil Sci. Soc. Am. J. 40, 359–364.CrossRefGoogle Scholar
Fieldes, M. and Schofield, R. K. (1960) Mechanisms of ion adsorption by inorganic soil colloids: New Zealand J. Sci. 3, 564–579.Google Scholar
Florence, T. M. and Farrer, Y. J. (1971) Spectrophotometric determination of chloride at the parts-per-billion level by the mercury (III) thiocyanate method: Anal. Chim. Acta 54, 373–377.CrossRefGoogle Scholar
Greenland, D. J. (1975) Charge characteristics of some kaolinite–iron hydroxide complexes: Clay Minerals 10, 407–416.Google Scholar
Houng, K. H., Uehara, G. and Sherman, G. D. (1966) On the exchange properties of allophanic clays: Pacific Sci. 20, 507–514.Google Scholar
Hussain, A. and Kyuma, K. (1970) Charge characteristics of soil organomineral complexes and their effect on phosphate fixation: Soil Sci. Plant Nutr. 16, 154–162.CrossRefGoogle Scholar
Iimura, K. (1961) Acidic property and ion exchange in allophane: Clay Sci. 1, 28–32.Google Scholar
Jackson, M. L. (1963) Aluminium bonding in soils: a unifying principle in soil science: Soil Sci. Soc. Am. Proc. 27, 1–9.CrossRefGoogle Scholar
Leonard, A., Suzuki, Sho Fripiat, J. J. and de Kimpe, C. (1964) Structure and properties of amorphous silicoaluminas. I. Structure from X-ray fluorescence spectroscopy: J. Phys. Chem. 68, 2608–2617.CrossRefGoogle Scholar
Milliken, T. H., Mills, G. A. and Oblad, A. G. (1950) The chemical characteristics and structure of cracking catalysts: Discussions Faraday Soc. 8, 279–290.CrossRefGoogle Scholar
Nail, S. L., White, J. L. and Hem, S. L. (1976) Structure of aluminium hydroxide gel II: aging mechanism: J. Pharm. Sci. 65, 1192–1195.CrossRefGoogle ScholarPubMed
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. Isoelectric point and zero point of charge: Adv. Chem. Ser. 67, 121–160.CrossRefGoogle Scholar
Perrott, K. W., Langdon, A. G. and Wilson, A. T. (1974) Sorption of phosphate by aluminium and iron (III)-hydroxy species on mica surfaces: Geoderma 12, 223–231.CrossRefGoogle Scholar
Rajan, S. S. S. (1975) Phosphate adsorption and the displacement of structural silicon in an allophane clay: J. Soil Sci. 26, 250–256.CrossRefGoogle Scholar
Rajan, S. S. S. and Perrott, K. W. (1975) Phosphate adsorption by synthetic amorphous aluminosilicates: J. Soil Sci. 26, 257–266.CrossRefGoogle Scholar
Rajan, S. S. S., Perrott, K. W. and Saunders, W. M. H. (1974) Identification of phosphate-reactive sites of hydrous alumina from proton consumption during phosphate adsorption at constant pH values: J. Soil Sci. 25, 438–447.CrossRefGoogle Scholar
Schofield, R. K. (1949) Effect of pH on electric charges carried by clay particles: J. Soil Sci. 1, 1–8.CrossRefGoogle Scholar
Strazhenko, D. N., Strelko, V. B., Belyakov, V. N. and Rubanik, S. (1974) Mechanism of cation exchange on silica gels: J. Chromatogr. 102, 191–195.CrossRefGoogle Scholar
Sumner, M. E. (1963) Effect of alcohol washing and pH value of leaching solution on positive and negative charges in ferriginous soils: Nature 198, 1018–1019.CrossRefGoogle Scholar
Tamele, M. W. (1950) Chemistry of the surface and the activity of alumina-silica cracking catalyst: Discussions Faraday Soc. 8, 270–279.CrossRefGoogle Scholar
Tonkin, P. J. (1970) Contorted stratification with clay lobes in volcanic ash beds, Raglan-Hamilton region, New Zealand: Earth Sci. J. 4, 129–140.Google Scholar
van Reeuwijk, L. P. and de Villiers, J. M. (1970) A model system for allophane: Agrochemophysica 2, 77–82.Google Scholar
Wada, K. and Harada, Y. (1969) Effects of salt concentration and cation species on the measured cation exchange capacity of soils and clays: Proc. Int. Clay Conf., Tokyo, 1969, Vol. 1, pp. 561–571.Google Scholar
Wada, K. and Harward, M. E. (1974) Amorphous clay constituents of soils: Adv. Agron. 26, 211–260.CrossRefGoogle Scholar