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USE OF COCONUT FIBRE PITH-BASED PSEUDO-ACTIVATED CARBON FOR CHROMIUM (VI) REMOVAL
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1997
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Chemical EngineeringCarbonizationEngineeringMaximum AdsorptionEnvironmental EngineeringBioremediationWater PurificationEnvironmental RemediationAdsorption ProcessWater TreatmentChemisorptionActivated CarbonAdsorptionBio-based SorbentSecond Order KineticsWastewater Treatment
The ability of coconut fibre pith carbon to remove Cr(VI) from aqueous solution by adsorption was studied. The extent of removal was found to be dependent on sorbent dose, initial concentration, pH and temperature. The adsorption follows a second order kinetics. An empirical relationship has been suggested to predict the percentage Cr(VI) removal at any time for known values of sorbent dose and initial sorbate concentration under observed test conditions. Studies on the diverse ions reveal that the sorption of Cr(VI) is practically unaffected by the presence of diverse ions. The adsorption process is exothermic with a maximum adsorption of 99.2 percent at 30°C for an initial concentration of 50 mgL -1 at pH 2.0. Thermodynamic parameters were evaluated. Desorption studies revealed that the spent adsorbent can be regenerated and reused by alkali treatment.