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pH-Dependent Boron Adsorption by Na-Montmorillonite¹

ABSTRACT

A simple phenomenological equation was derived and applied to boron adsorption by Na-montmorillonite as a function of pH and boron concentration in solution. The equation, which is based on the assumption that B(OH)₃, B(OH)₄^-, and OH^- are all competing for the same adsorption sites, includes constants related to the binding energy K_HB, K_B, and K_OH for the three species as well as the total boron adsorption capacity factor, T. Results of boron adsorption at three pH's were used to estimate the values of these parameters. Estimated values of T, K_HB, K_B, and K_OH were 6.02 x 10^–6 mol/g, 194, 1,745, and 25,803 liters/mol, respectively. It was found that these values for the parameters could in turn be used to predict boron adsorption on Na-montmorillonite systems at other pH values and boron concentrations. Results found for Na-montmorillonite were consistent with those found by others in that boron adsorption varied with both pH and boron concentration, with maximum adsorption occurring at pH 9.3.

¹ Contribution from the Institute of Soils & Water, Agric. Research Organization, The Volcani Center, Bet Dagan, Israel. No. 290-E, 1979 series. This research was supported by a grant from the United States-Israel Binational Science Foundation (BSF), Jerusalem, Israel.

² Soil Scientist, Institute of Soils & Water, ARO, The Volcani Center, Bet Dagan, Israel; Professor and Head, Dep. of Agronomy, Univ. of Nebraska, Lincoln, Nebr.; and Soil Scientist, Institute of Soils & Water, ARO, The Volcani Center, Bet Dagan, Israel, respectively.

Received for publication January 11, 1980. Accepted for publication September 29, 1980.

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