Equilibrium and kinetic studies of biosorption of Cr (III) and Cd (II) by activated carbon prepared from Spirulina algae

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Research Paper 01/09/2015
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Equilibrium and kinetic studies of biosorption of Cr (III) and Cd (II) by activated carbon prepared from Spirulina algae

Engy Elhaddad, Sekina T.A. Tantawy
J. Bio. Env. Sci.7( 3), 132-140, September 2015.
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The Spirulina algae were converted into activated carbon to remove heavy metal by low cost and innocuous material in the water. The sorption behavior of Chromium (III) and Cadmium (II) cations by Spirulina was studied to uptake the heavy metal cations from aqueous solution. The removal of these metals was investigated by batch method experiment. The main factors that affect Cd2+ and Cr3+ sorption on Spirulina, the influences of pH (2–7) and contact time (5-120 min) have been investigated. The percent removal of Cr3+ and Cd2+cations reached maximum at 35 and 45 min respectively. The binding sorption sites were strongly influenced by pH and the optimum pH for Cd2+ and Cr3+cations were 5. The percentage of up taking Cr3+ and Cd2+cations reached maximum to 94.3% and 83.8%, respectively. The sorption efficiency of activated carbon prepared from Spirulina for chromium is greater than cadmium metal and the Langmuir module is fitted the results better than other models. Kinetic studies presented that a pseudo-second order model was more appropriate than the pseudo first order model. It is concluded that the activated carbon prepared from Spirulina cloud be used as an effective sorbent for uptake of Cr3+ and Cd 2+ from wastewater.


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