search
for
 About Bioline  All Journals  Testimonials  Membership  News  Donations


International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 12, No. 5, 2015, pp. 1569-1580
Bioline Code: st15146
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 12, No. 5, 2015, pp. 1569-1580

 en Removal of hexavalent chromium from aqueous solutions using barks of Acacia albida check for this species in other resources and leaves of Euclea schimperi
Gebrehawaria, G.; Hussen, A. & Rao, V.M.

Abstract

Removal of hexavalent chromium ions [Cr(VI)] from aqueous solutions by adsorbents prepared from barks of Acacia albida check for this species in other resources of Fabaceae family and leaves of Euclea schimperi of Ebenaceae family has been studied by batch adsorption technique. Double-beam UV–visible spectrophotometer was used to monitor the concentration of Cr(VI). The influence of contact time, initial chromium ion concentration, pH and adsorbent dose on the efficiency of adsorption process was studied. Among the studied parameters, pH was found to be the most influential. At the optimum pH (pH 2), 98.47 and 97.39 % removal of Cr(VI) was achieved using the adsorbents prepared from barks of A. albida and leaves of E. schimperi, respectively. After determining the optimal conditions for maximum adsorption, the applicability of the biosorbents was tested on real samples. The results indicate that these adsorbents can be employed as low-cost alternatives to commercial adsorbents for the removal of Cr(VI) from effluents. Adsorption isotherms and kinetic parameters were also studied. The results showed that the adsorption of Cr(VI) by these adsorbents follow Langmuir adsorption isotherm. The kinetics of the adsorption process follows the pseudo-second-order kinetic model.

Keywords
Heavy metals; Isotherms; Kinetics; Natural adsorbents

 
© Copyright 2015 - International Journal of Environment Science and Technology
Alternative site location: http://www.ijest.org

Home Faq Resources Email Bioline
© Bioline International, 1989 - 2017, Site last up-dated on 16-Oct-2017.
Site created and maintained by the Reference Center on Environmental Information, CRIA, Brazil
System hosted by the Internet Data Center of Rede Nacional de Ensino e Pesquisa, RNP, Brazil