Journal of Industrial and Engineering Chemistry, Vol.25, 131-137, May, 2015
Influence of mechanical activation on the reactivity of natural pyrite in lead (II) removal from aqueous solutions
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Reactivity of mechanically activated natural pyrite in the adsorption of Pb2+ was investigated. The results proved that the exothermic adsorption of Pb2+ onto pyrite changed to an endothermic adsorption onto mechanically activated pyrite. The thermodynamic studies revealed that pyrite reactivity has improved by mechanical activation. Entropy variations verified that the adsorption affinity of Pb2+ onto the mechanically activated pyrite was more than the pyrite. The adsorption isotherm modeling revealed that the Langmuir isotherm fitted well with Pb2+ adsorption onto 20 min mechanically activated pyrite, while the Freundlich isotherm matched Pb2+ adsorption onto natural and mechanically activated pyrite for 100 min.
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