Kinetics and thermodynamics of aqueous Cu(II) adsorption on heat regenerated spent bleaching earth

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dc.contributor.authorWambu, E.W.
dc.contributor.authorMuthakia, Gerald K.
dc.contributor.authorWa-Thiong’o, Joseph K.
dc.contributor.authorShiundu, Paul M.
dc.date.accessioned2014-09-29T12:32:25Z
dc.date.available2014-09-29T12:32:25Z
dc.date.issued2011
dc.descriptionhttp://dx.doi.org/10.4314/bcse.v25i2.65857en_US
dc.description.abstractThis study investigated the kinetics and thermodynamics of copper(II) removal from aqueous solutions using spent bleaching earth (SBE). The spent bleaching earth, a waste material from edible oil processing industries, was reactivated by heat treatment at 370 oC after residual oil extraction in excess methylethylketone. Copper adsorption tests were carried out at room temperature (22±3 ºC) using 5.4 x 10-3 M metal concentrations. More than 70% metal removal was recorded in the first four hours although adsorption continued to rise to within 90% at 42 hours. The pH, adsorbent dosage and initial concentrations were master variables affecting RSBE adsorption of Cu(II) ions. The adsorption equilibrium was adequately described by the Dubinin- Radushkevich (D-R) and the Temkin isotherms and the maximum sorption capacity derived from the D-R isotherm was compared with those of some other low cost adsorbents. The adsorption process was found to follow Lagergren Pseudo-second order kinetics complimented by intra-particle diffusion kinetics at prolonged periods of equilibration. Based on the D-R isotherm adsorption energy and the thermodynamic adsorption free energy _G, it was suggested that the process is spontaneous and based on electrostatic interactions between the metal ions and exposed active sites in the adsorbent surface.en_US
dc.identifier.citationBulletin of the Chemical Society of Ethiopia2011, 25(2), 181-190.en_US
dc.identifier.issn1011-3924
dc.identifier.other1726-801X
dc.identifier.urihttp://www.ajol.info/index.php/bcse/article/viewFile/65857/53576
dc.identifier.urihttp://ir-library.ku.ac.ke/handle123456789/11290
dc.language.isoenen_US
dc.publisherChemical Society of Ethiopiaen_US
dc.subjectKineticsen_US
dc.subjectThermodynamicsen_US
dc.subjectCopper adsorption isothermsen_US
dc.subjectSpent bleaching earthen_US
dc.titleKinetics and thermodynamics of aqueous Cu(II) adsorption on heat regenerated spent bleaching earthen_US
dc.typeArticleen_US
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