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Evidence Supporting Specific Adsorption of Boron on Synthetic Aluminum Hydroxides¹

ABSTRACT

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.

¹ Contribution from the Purdue University Agric. Exp. Stn. Journal Paper no. 9365.

² Graduate Instructor, Associate Professor, Visiting Assist. Professor, Agron. Dep., Purdue Univ., W. Lafayette, IN 47907.

Received for publication March 7, 1983. Accepted for publication October 10, 1983.