Fig 1.
Scanning electron micrographs of isolate SAR1 before and after treatment with Cr.
a: Control; b: After treatment with Cr.
Fig 2.
Effect of pH on bioremoval of Cr SAR1.
Fig 3.
Effect of biomass dosage on bioremoval of Cr.
Fig 4.
Effect of Cr concentration on bioreduction and uptake by SAR1.
Fig 5.
Adsorption isotherm for isolate SAR1 after Cr biosorption A: Langmuir isotherm; B: Freundlich isotherm.
Fig 6.
a. The plot of Q vs √t; Weber and Morris for the rate-limiting step; b. The plot of log Q vs 0.5 log t; Weber and Morris for the mechanism of adsorption.
Fig 7.
FTIR Spectra of isolate SAR1 A: before Control (–) and B: after Cr biosorption (–).
Table 1.
Change of IR absorption bands after treatment of isolate SAR1 with chromium.
Fig 8.
Steps in chromium biotransformation mechanism.
a. Adsorption of Cr (VI) to exopolysaccharide, lipopolysaccharide, lipoproteins, peptidoglycans; b. Biotransformation of Cr (VI) to Cr (III); c. Release of Cr III into the solution.