Volume 6, Number 1
 
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Science International Vol. 6 (1), 2018
Review Article
Microscopic Investigations on the Biosorption of Heavy Metals by Bacterial Cells: A Review
Duraisamy Ramya and A. Joseph Thatheyus
 
Abstract: Industry has been the major contributor of pollution since decades, destroying the environment and natural resources. Among the types of pollutants, heavy metals are engendering major threat to the biosphere. A significant number of biosorption studies on the removal of heavy metals from aqueous solutions have been conducted worldwide. Nearly all of them have been aimed at optimizing biosorption parameters to obtain the highest removal efficiency while the rest of them are concerned with the biosorption mechanism. The mechanism and chemical nature of heavy metal sequestration by bacteria were investigated by scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis and atomic force microscopy (AFM). Atomic force microscopy used in the tapping mode elucidated the morphological changes in bacterial cells following heavy metal binding. Morphological assessment and quantification of heavy metals within the bacterial cells were performed by scanning electron microscopy and energy dispersive X-ray analysis.
 
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