Adsorption of cadmium from aqueous solution using Rooibos shoots as adsorbent

The use of Rooibos shoots, a natural adsorbent, for cadmium removal from wastewater is proposed. The effects of initial pH, adsorbent dosage, contact time, and initial concentration were investigated in the batch adsorption mode. The optimum pH was found to be 5.5. Isotherm and kinetic data were mod...

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Bibliographic Details
Published in:Toxicological and environmental chemistry 2014-11, Vol.96 (10), p.1452-1462
Main Authors: Kanu, Sheku A., Moyo, Mambo, Khamlich, Saleh, Okonkwo, Jonathan O.
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Aqueous solutions
Biomass
Cadmium
Contact
isotherm
Isotherms
Kinetics
Optimization
Rooibos shoots
Wastewater treatment
Water treatment
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Summary:The use of Rooibos shoots, a natural adsorbent, for cadmium removal from wastewater is proposed. The effects of initial pH, adsorbent dosage, contact time, and initial concentration were investigated in the batch adsorption mode. The optimum pH was found to be 5.5. Isotherm and kinetic data were modeled; the data fitted best to the Freundlich model, and, kinetically, the adsorption was of pseudo-second order as shown by the high R 2 value of 0.9928 along with close agreement between the experimental q e (13.9 mg g −1 ) and calculated q e (14.24 mg g −1 ) values. The studied biomass material was found to be effectively used for removal of cadmium from contaminated mine wastewater.
ISSN:0277-2248
1029-0486
DOI:10.1080/02772248.2015.1030666