Cyanoremediation of heavy metals (As( <scp>v</scp> ), Cd( <scp>ii</scp> ), Cr( <scp>vi</scp> ), Pb( <scp>ii</scp> )) by live cyanobacteria ( <i>Anabaena variabilis</i> , and <i>Synechocystis</i> sp.): an eco-sustainable technology
Md. Sabbir Hossain, Tatsufumi Okino
Abstract
, dry biomass, chlorophyll a, and carotenoid production for both strains. Fourier transform infrared spectrum (FT-IR) analysis revealed the existence of diverse surface binding sites for HM adsorption, stemming from proteins and polysaccharides. Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) confirmed the presence of HMs on the surface of the cyanobacterial cells. Finally, the zeta potential results indicating alterations in the surface negative charges elucidated the adsorption mechanisms involved in the HM removal by both cyanobacteria. These results provided a comprehensive understanding of the HM adsorption mechanism by cyanobacteria, offering valuable theoretical insights that can be extrapolated to enhance our comprehension of the cyanoremediation mechanisms by various other cyanobacterial strains.