Biosorption of heavy metals by a lead (Pb) resistant bacterium, Staphylococcus hominis strain AMB‐2
2019
Rahman, Zeeshanur | Thomas, Lebin | Singh, Ved Pal
In the present study, a lead (Pb)‐resistant bacterium, Staphylococcus hominis strain AMB‐2 was isolated from Mandoli industrial area, Delhi and selected for heavy metal biosorption considering multiple heavy metal resistance. In the batch experiment, both living and dead biomasses of strain AMB‐2 showed biosorption of Pb and cadmium (Cd) in single and binary systems as analyzed through Inductively coupled plasma‐optical emission spectrometry. Living biomass exhibited more biosorption of metals than dead biomass in both single and binary systems. However, in the binary system, metals competed for the attachment sites on the bacterial surface, where Pb got more preference over Cd for the same. The underlying mechanism for the biosorption was attachment of the metal ions through functional groups onto the surface of the biomass as revealed by scanning electron microscope‐energy‐dispersive X‐ray spectroscopy, Fourier‐transform infrared spectroscopy, and X‐ray diffraction. Conclusively, this study displayed an effective biotreatment of Pb and Cd from aqueous medium using a low‐cost biosorbent prepared from S. hominis strain AMB‐2 considering biosafety of microorganisms and an eco‐friendly approach.
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