Abstract
Change in surface charge of nano–ball allophane samples with different Si/Al ratios were studied under varying amounts of phosphate and oxalate adsorption. Cation exchange capacity increased with increase in solution pH and after competitive adsorption of phosphate and oxalate. On the other hand, anion exchange capacity decreased with increase in solution pH, and after competitive adsorption of phosphate and oxalate. Allophane samples after competitive adsorption of phosphate and oxalate with high Si/Al ratio were found to have higher cation exchange capacity than those of lower Si/Al ratio. The findings of this work suggested that increasing pH and competitive adsorption of phosphate and oxalate compounds result in changing the surface charge characteristics of nano–ball allophane.
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