Biosorption of aqueous metal ions and metal ion mixtures onto ground peanut hulls

WCU Author/Contributor (non-WCU co-authors, if there are any, appear on document)
Melisa Glatte (Creator)
Institution
Western Carolina University (WCU )
Web Site: http://library.wcu.edu/
Advisor
Carmen Huffman

Abstract: The purpose of this research project was to investigate the adsorption of heavy metals onto unmodified and modified ground peanut hulls to determine their compatibility as a biosorbent for heavy metal containing aqueous environments. The adsorptions of copper and cadmium were assessed individually, and in combination, through a series of batch studies to investigate the metal specific adsorption capacities and competition between metal ions for binding sites using unmodified and modified 125-250 µm, 250-500 µm, and 500-1000 µm hulls. The results from unmodified and modified hulls were compared to determine that modified hulls have higher adsorption capacities for copper and cadmium than unmodified hulls of similar size due to increased porosity following the bleaching process. In single metal solutions, there was not a significant difference in the adsorption capacities for copper and cadmium. However, hulls have higher adsorption capacities for copper than cadmium in binary metal solutions, which may be attributed to kinetics. The factors that influence the adsorption of copper and cadmium onto ground peanut hulls are the nature of the ion, including polarizing power and ionic radius, and the material used as the sorbent, with the type of material playing the largest role in determining the adsorption of metals.

Additional Information

Publication
Thesis
Language: English
Date: 2017
Keywords
adsorption, bioremediation, Biosorption, Cadmium, Copper, peanut hulls

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