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

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dc.contributor.author Wambu, Enos W
dc.contributor.author Muthakia, Gerald K
dc.contributor.author wa-Thiong’o, Joseph K
dc.contributor.author Shiundu, Paul M
dc.date.accessioned 2015-05-22T15:13:34Z
dc.date.available 2015-05-22T15:13:34Z
dc.date.issued 2011
dc.identifier.citation Bulletin of the Chemical Society of Ethiopia, Vol 25, No 2 (2011) en_US
dc.identifier.uri http://www.ajol.info/index.php/bcse/article/view/65857
dc.identifier.uri http://hdl.handle.net/123456789/1043
dc.description.abstract This 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 methyl-ethyl ketone. 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.language.iso en en_US
dc.subject Kinetics en_US
dc.subject Thermodynamics en_US
dc.subject Copper adsorption isotherms en_US
dc.subject Spent bleaching earth en_US
dc.title Kinetics and thermodynamics of aqueous Cu(II) adsorption on heat regenerated spent bleaching earth en_US
dc.type Article en_US

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