Biosorption of Cr (VI), Cr (III), Pb (II) and Cd (II) from aqueous solutions by Sargassum wightii and Caulerpa racemosa algal biomass |
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Authors: | Narayanaswamy Tamilselvan Kumar Saurav Krishnan Kannabiran |
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Institution: | (1) Discipline of Marine Biotechnology and Ecology, Central Salt and Marine Chemicals Research Institute, Bhavnagar, 364 002, Gujarat, India |
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Abstract: | Heavy metal pollution is one of the most important environmental problems today. Biosorption is an innovative technology that
employs biological materials to accumulate heavy metals from waste water through metabolic process or physicochemical pathways
of uptake. Even though several physical and chemical methods are available for removal of heavy metals, currently many biological
materials such as bacteria, algae, yeasts and fungi have been widely used due to their good performance, low cost and large
quantity of availability. The aim of the present study is to explore the biosorption of toxic heavy metals, Cr(VI), Cr(III),
Pb(II) and Cd(II) by algal biomass obtained from algae Sargassum wightii (brown) and Caulerpa racemosa (green). Biosorption of algal biomass was found to be biomass concentration- and pH-dependent, while the maximal biosorption
was found at pH 5.0 and with the metal concentration of 100 mg L−1. S. wightii showed the maximal metal biosorption at the biomass concentration of 25 g L−1, followed by C. racemosa with the maximal biosorption at 30 g L−1. S. wightii showed 78% biosorption of Cr(VI), Cr(III), Pb(II) and Cd(II) ions. C. racemosa exhibited 85% biosorption of Cd(II) and Cr(VI), and 50% biosorption of Cr(III) and Pb(II). The results of our study suggest
that seaweed biomass can be used efficiently for biosorption of heavy metals. |
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Keywords: | heavy metals biosorption brown algae green algae bioaccumulation sea weeds |
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