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Boron Release and Sorption by Fly Ash as Affected by pH and Particle Size
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1988
Year
Chemical EngineeringEnvironmental ChemistryEngineeringChemisorptionAnalytical ChemistryFly AshParticle TechnologyAdsorptionChemistryParticle SizeAsh Particle SizeBio-based SorbentMineral ProcessingChemical KineticsBoron ReleaseLigand Exchange
Abstract The effect of ash particle size, pH, and Ca(OH) 2 presence on the dissolution and adsorption of B by fly ash in aqueous media was studied. Most of the soluble B was found in the small particles of ash. Dissolution of B was independent of the dissolution of Ca from fly ash. Decreasing the pH from 12.5 to 6 increased both the solubility and the extractability of B. A small amount of B was adsorbed by fly ash at pH 7; this was attributed to a ligand exchange mechanism. Sorption of B increased with increasing pH, up to 12, which could not be explained by ligand exchange but rather with coprecipitation with CaCO 3 .