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 |