Abstract
The current research is the first to focus on the study of biosorption potential of a novel bacterium Chelatococcus sp. to biosorb metal ions from aqueous samples. An isolated bacterial strain Pb1S1 was characterized for biosorption efficiency for Pb (II) ions. Based on microscopic and phylogenetic analysis, the isolated strain was identified as belonging to the genus Chelatococcus. At optimized experimental conditions, the maximum biosorption efficiency for Pb (II) ion was 86.44% at metal concentration of 100 µg/mL, pH 6.5, biomass dose of 60 mg/L, temperature of 35 °C and incubation of 18 h at 60 rpm. Analysis of biomass by scanning electron microscope and energy-dispersive X-ray shows the morphological changes and alteration in elemental composition attained due to biosorption. Functional groups of biomass involved in biosorption were identified by Fourier transform infrared spectroscopy. The experimental data were fitted well with Langmuir isotherm, while kinetic data showed the best fit with pseudo-first-order kinetic model. At optimized biosorption conditions, Chelatococcus biomass showed good capability for biosorption of Pb (II) from contaminated water sources. Hence, the study interprets that Chelatococcus biomass can be considered as robust, inexpensive and efficient novel biosorbent for the removal of metals.
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