dc.contributor.author | Wambu, Enos W | |
dc.contributor.author | Muthakia, Gerald K | |
dc.contributor.author | wa-Thiong’o, Joseph K | |
dc.contributor.author | Shiundu, PM | |
dc.date.accessioned | 2013-06-14T12:09:27Z | |
dc.date.available | 2013-06-14T12:09:27Z | |
dc.date.issued | 2011 | |
dc.identifier.citation | Bull. Chem. Soc. Ethiop. 2011, 25(2), 181-190. | en |
dc.identifier.uri | http://www.ajol.info/index.php/bcse/article/view/65857/53576 | |
dc.identifier.uri | http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/33895 | |
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 methylethyl 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 DubininRadushkevich (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 |
dc.language.iso | en | en |
dc.subject | Kinetics | en |
dc.subject | Thermodynamics | en |
dc.subject | Copper adsorption isotherms | en |
dc.subject | Spent bleaching earth | en |
dc.title | Kinetics and thermodynamics of aqueous Cu(II) adsorption on heat regenerated spent bleaching earth | en |
dc.type | Article | en |
local.publisher | Department of Chemistry, University of Nairobi, | en |
local.publisher | Department of Chemistry, Kimathi University College of Technology | en |
local.publisher | Department of Chemistry, Kenyatta University | en |