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Abstract
Flavobacterium mizutaii has been isolated from soil samples for efficient removal of two azo dyes that is, napthol blue black (Color Index 20470) and direct red 80 (Color Index 35780). The adsorption behaviors of these azo dyes have been investigated in detail to explore the potentiality of F. mizutaii in pollution control management. Effects of various conditions such as pH, temperature, dye concentrations, and incubation time have been studied to optimize the adsorption process. The process is found to be a function of pH of the solution, with the optimum range being pH 1.0–2.0. The results also establish that 405.82 ± 51.4 µmol of napthol blue black and 253.15 ± 31.8 µmol of direct red 80 are adsorbed per gram of F. mizutaii at optimum conditions. FTIR spectroscopic study and functional groups modifications demonstrates different functional groups viz. carboxyl, amine, and phosphate groups of the cell wall components responsible for adsorption of the dyes. AFM along with TEM analysis demonstrates a conspicuous surface morphology change of the dye-adsorbed biomass.
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ACKNOWLEDGEMENTS
We thank Dr. P. C. Banerjee, Emeritus Scientist, Department of Metallurgical Engineering, Jadavpur University, Kolkata, for his valuable suggestion during identification of bacterial strain. We also thank Dr. Rajat Roy, Central Food Laboratory, Kolkata, for his cooperation during the biochemical test of the isolated strain. Thanks are also due to Mr. S. Majhi, Mr. S. Chakbraborty, and Mr. R. N. Banik of India Association for the Cultivation of Science, for their cooperation during SEM, TEM, and AFM studies, respectively.