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This article in SSSAJ

  1. Vol. 48 No. 2, p. 284-287
    Received: Mar 7, 1983
    Accepted: Oct 10, 1983

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Evidence Supporting Specific Adsorption of Boron on Synthetic Aluminum Hydroxides1

  1. C. A. Beyrouty,
  2. G. E. Van Scoyoc and
  3. J. R. Feldkamp2



Aluminum hydroxide gels were precipitated in the presence of boron (B). Both chemical and infrared analyses were used to characterize the B adsorption sites on the Al(OH)3.

The zero point of charge (ZPC) in a gel containing B was 1.6 to 2.1 pH units lower than a gel without B. This reduction was attributed to an increase in the negative charge of the hydroxide surface as a result of specific adsorption of B. Aging studies revealed that adsorbed B in gels retarded crystal growth of the Al(OH)3. The concentration of B in the total gel, in the electrical double layer and on the hydroxide surface was determined colorimetrically. Essentially all adsorbed boron was held onto the hydroxide surface.

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