<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Various microbial biomasses have been employed as biosorbents. Bacterial biomass has added advantages because of easy in production at a low cost. The study investigated the biosorption of iron from aqueous solutions by <italic>Bacillus subtilis</italic>. An optimum biosorption capacity of 7.25 mg of the metal per gram of the biosorbent was obtained by the Inductive Coupled Plasma Optical Emission Spectroscopy (ICP-OES) under the experimental conditions of initial metal concentration of 100 mg/l, pH 4.5, and biomass dose of 1 g/l at 30°C for 24 hrs. The data showed the best fit with the Freundlich isotherm model while following pseudo-first-order kinetics. Scanning Electron Microscope (SEM) and Energy Dispersive X-ray (EDX) analysis confirmed iron biosorption as precipitates on the bacterial surface, and as a peak in the EDX spectrum. The functional hydroxyl, carboxyl, and amino groups that are involved in biosorption were revealed by the Fourier Transform Infrared spectroscopy (FTIR). The amorphous nature of the biosorbent for biosorption was indicated by the X-ray Diffraction (XRD) analysis. The biomass of <italic>B. subtilis</italic> exhibited a point zero charge (pH<sub>pzc</sub>) at 2.0.</p></abstract>

Various microbial biomasses have been employed as biosorbents. Bacterial biomass has added advantages because of easy in production at a low cost. The study investigated the biosorption of iron from aqueous solutions by Bacillus subtilis. An optimum biosorption capacity of 7.25 mg of the metal per gram of the biosorbent was obtained by the Inductive Coupled Plasma Optical Emission Spectroscopy (ICP-OES) under the experimental conditions of initial metal concentration of 100 mg/l, pH 4.5, and biomass dose of 1 g/l at 30°C for 24 hrs. The data showed the best fit with the Freundlich isotherm model while following pseudo-first-order kinetics. Scanning Electron Microscope (SEM) and Energy Dispersive X-ray (EDX) analysis confirmed iron biosorption as precipitates on the bacterial surface, and as a peak in the EDX spectrum. The functional hydroxyl, carboxyl, and amino groups that are involved in biosorption were revealed by the Fourier Transform Infrared spectroscopy (FTIR). The amorphous nature of the biosorbent for biosorption was indicated by the X-ray Diffraction (XRD) analysis. The biomass of B. subtilis exhibited a point zero charge (pHpzc) at 2.0.

Structural Changes of <italic>Bacillus subtilis</italic> Biomass on Biosorption of Iron (II) from Aqueous Solutions: Isotherm and Kinetic Studies

Polish Journal of Microbiology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Structural Changes of  Biomass on Biosorption of Iron (II) from Aqueous Solutions: Isotherm and Kinetic Studies

Various microbial biomasses have been employed as biosorbents. Bacterial biomass has added advantages because of easy in production at a low cost. The study...

Structural Changes of Bacillus subtilis Biomass on Biosorption of Iron (II) from Aqueous Solutions: Isotherm and Kinetic Studies

Article Category: original-paper

Published Online: Dec 05, 2019

Page range: 549 - 558

Received: Jun 09, 2019

Accepted: Nov 11, 2019

DOI: https://doi.org/10.33073/pjm-2019-057

Keywords
biosorption, iron, isotherms, kinetics

© 2019 Sri Lakshmi Ramya Krishna Kanamarlapudi and Sudhamani Muddada et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Structural Changes of Bacillus subtilis Biomass on Biosorption of Iron (II) from Aqueous Solutions: Isotherm and Kinetic Studies

Article Category: original-paper

Published Online: Dec 05, 2019

Page range: 549 - 558

Received: Jun 09, 2019

Accepted: Nov 11, 2019

DOI: https://doi.org/10.33073/pjm-2019-057

Keywordsbiosorption, iron, isotherms, kinetics

© 2019 Sri Lakshmi Ramya Krishna Kanamarlapudi and Sudhamani Muddada et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Keywords
biosorption, iron, isotherms, kinetics