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Cadmium and Zinc Adsorption onto Activated Carbon: Influence of Temperature, pH and Metal/Carbon Ratio
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1996
Year
EngineeringBio-based SorbentChemistryZinc AdsorptionWastewater TreatmentChemical EngineeringEnvironmental ChemistryMetal/carbon RatioAdsorption CharacteristicsSurface Complex FormationChemisorptionScf ConstantAdsorptionWaste ManagementExtractive MetallurgyEnvironmental EngineeringWater PurificationEnvironmental RemediationActivated Carbon
The adsorption characteristics of cadmium and zinc onto a granular activated carbon were studied. Cadmium and zinc removals increased on raising pH and temperature, and decreased on raising the molar metal/carbon ratio. The adsorption processes were modelled using the surface complex formation (SCF) Triple Layer Model (TLM) with an overall bidentate species. A dependence of the SCF constant on pH, the molar metal/carbon ratio and temperature was observed, and a correlation for log Kads was determined. The SCF model successfully predicted cadmium and zinc removals.