Sorption of Heavy Metals from Elecroplating Effluents by Low-Cost Adsorbents II: Use of Waste Tea, Coconut Shell and Coconut Husk
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Date
2007-12
Authors
Olayinka, K. O.
Adu, T.
Alo, B. I.
Journal Title
Journal ISSN
Volume Title
Publisher
ANSInet
Abstract
Present research focuses on the use of waste tea, coconut shell and coconut husk as potential low-cost adsorbents for removal of heavy metals chromium (Cr), zinc (Zn) and nickel (Ni)) from three different electroplating plant effluents. The traditional activated carbon was also compared for objective assessment of the efficiency of the low cost adsorbents. The adsorbents were used in batch tests with electroplating effluents, its metal binding capacity, pH dependence of metal uptake and kinetics of metal adsorption were investigated. The study showed most of the metal uptake was within the first 60 min of exposure for all the adsorbents. Cr (VI) was optimally bound to the adsorbents at pH 3-4 and Zn(II) and Ni(II) at pH 7-9. The metal binding capacity differed for the adsorbents. Coconut shell was more effective for Ni ( 97.36% removal). All the three showed high rate of adsorption Zn (coconut shell, 99.74%, coconut husk 99.76% and waste tea 90.74% removal). All three satisfied the Freundlich Adsorption Isotherm.
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Keywords
Research Subject Categories::NATURAL SCIENCES::Chemistry::Analytical chemistry::Separation methods , Adsorption , Coconut husk , Coconut shell , Electroplating effluent , Heavy metals
Citation
Olayinka, K. O., Alo, B. I., & Adu, T. (2007). Sorption of Heavy Metals from Elecroplating Effluents by Low-Cost Adsorbents II: Use of Waste Tea, Coconut Shell and Coconut Husk. Journal of Applied Sciences, 7, 2307-2313.