Change in Surface Charge Properties of Nano-Ball Allophane with Different Si/Al Ratios During Competitive Oxalate and Phosphate Adsorption

Mohammed Abdalla Elsheikh, Moses Munthali, Erni Johan, Pardon Muchaonyerwa, Naoto Matsue

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.

Keywords


Surface charge; competitive adsorption; nano-ball allophane; oxalate; phosphate

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