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

Kanamarlapudi, Sri Lakshmi Ramya Krishna; Muddada, Sudhamani

doi:10.33073/pjm-2019-057

Cited by 19 publications

(6 citation statements)

References 33 publications

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“…In this study, based on the R 2 constant of pseudo-first and pseudo-second-order kinetics equations, the adsorption of lead and cadmium ions by extracted EPS has a heterogeneous diffusion manner. Similar results indicating that the adsorption process occurs by an ion-exchange mechanism (electron transfer) that affects the overall adsorption rate ( 41 , 55 – 58 ), which is compatible with the results of this study.…”

Section: Discussionsupporting

confidence: 93%

“…The

coefficient of the Freundlich model that is a criterion for adsorption intensity ( 52 ), indicates appropriate adsorption under experimental conditions and showed an acceptable adsorption process. Various other studies have reported that Freundlich isotherm models are better to explain the adsorption behavior of microorganisms ( 53 – 55 ). In this study, based on the R 2 constant of pseudo-first and pseudo-second-order kinetics equations, the adsorption of lead and cadmium ions by extracted EPS has a heterogeneous diffusion manner.…”

Section: Discussionmentioning

confidence: 99%

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Biosorption of Cd+2 and Pb+2 by Exopolysaccharide Extracted from Lactobacillus fermentum 6b; Adsorption Isotherm and Kinetic Studies

Kermanshahi¹,

Khaniki²,

Goudarzi³

2023

ijph

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Background: In recent years, the biosorption of heavy metals by Lactobacillus strains has received attention from researchers. We aimed to remove of heavy metals lead and cadmium from L. fermentum 6b exopolysaccharide in 2021. Methods: Extracellular exopolysaccharide was first extracted from selected probiotic strain, and then the effect of variables such as pH, the extracted exopolysaccharide adsorbent dose, contact time, heavy metal concentration, and temperature on the adsorption rate was investigated. The adsorption isotherms of Langmuir and Freundlich were also examined. Pseudo-first and pseudo-second-order kinetics equations were also investigated for the desired surface adsorption. Results: The adsorption process at pH=6.5, contact time=80 min, pollutant concentration=100 mg.L-1, adsorbent dose (extracted exopolysaccharide) =1500 mg.L-1, temperature=35°C for cadmium; pH= 6, contact time=60 min, contaminant concentration of 100 mg.L-1, adsorbent dose (extracted exopolysaccharide) =1500 mg.L-1 temperature=of 35 °C for lead had optimum condition. The adsorption process corresponded to Freundlich isotherm with R2=0.958 and R2=0.988, and pseudo-second-order kinetic with R2=0.99 and R2=0.85 for cadmium and lead, respectively. Conclusion: The exopolysaccharide extracted from L. fermentum 6b isolate can have an acceptable removal potential for lead and cadmium heavy metals.

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Section: Discussionsupporting

confidence: 93%

“…The

Section: Discussionmentioning

confidence: 99%

Biosorption of Cd+2 and Pb+2 by Exopolysaccharide Extracted from Lactobacillus fermentum 6b; Adsorption Isotherm and Kinetic Studies

Kermanshahi¹,

Khaniki²,

Goudarzi³

2023

ijph

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“…The results were in agreement with other studies which was also reported the Freundlich isotherm model to be well-fitted for Bacillus sp. ( Liu et al, 2013 ; Kanamarlapudi and Muddada, 2019 ). In another study, the same model was also observed to be opted by Lactobacillus fermentum for the biosorption of Cu ions ( Kargar and Shirazi, 2020 ).…”

Section: Discussionmentioning

confidence: 99%

Harnessing the Potential of Bacillus altitudinis MT422188 for Copper Bioremediation

et al. 2022

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The contamination of heavy metals is a cause of environmental concern across the globe, as their increasing levels can pose a significant risk to our natural ecosystems and public health. The present study was aimed to evaluate the ability of a copper (Cu)-resistant bacterium, characterized as Bacillus altitudinis MT422188, to remove Cu from contaminated industrial wastewater. Optimum growth was observed at 37°C, pH 7, and 1 mm phosphate, respectively. Effective concentration 50 (EC50), minimum inhibitory concentration (MIC), and cross-heavy metal resistance pattern were observed at 5.56 mm, 20 mm, and Ni > Zn > Cr > Pb > Ag > Hg, respectively. Biosorption of Cu by live and dead bacterial cells in its presence and inhibitors 1 and 2 (DNP and DCCD) was suggestive of an ATP-independent efflux system. B. altitudinis MT422188 was also able to remove 73 mg/l and 82 mg/l of Cu at 4th and 8th day intervals from wastewater, respectively. The presence of Cu resulted in increased GR (0.004 ± 0.002 Ug−1FW), SOD (0.160 ± 0.005 Ug−1FW), and POX (0.061 ± 0.004 Ug−1FW) activity. Positive motility (swimming, swarming, twitching) and chemotactic behavior demonstrated Cu as a chemoattractant for the cells. Metallothionein (MT) expression in the presence of Cu was also observed by SDS-PAGE. Adsorption isotherm and pseudo-kinetic-order studies suggested Cu biosorption to follow Freundlich isotherm as well as second-order kinetic model, respectively. Thermodynamic parameters such as Gibbs free energy (∆G°), change in enthalpy (∆H° = 10.431 kJ/mol), and entropy (∆S° = 0.0006 kJ/mol/K) depicted the biosorption process to a feasible, endothermic reaction. Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), and Energy-Dispersive X-Ray Spectroscopy (EDX) analyses revealed the physiochemical and morphological changes in the bacterial cell after biosorption, indicating interaction of Cu ions with its functional groups. Therefore, these features suggest the potentially effective role of B. altitudinis MT422188 in Cu bioremediation.

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“…Similarly, the removal e ciency of Cd (II) by the dead pellet was signi cantly higher than live pellet. The increase in biosorbent dosage may aggregate or overlap, which means reducing the available binding sites, leading to decreased adsorption capacity [41]. The active sites on the cell surface cannot be fully applied, which has also decreased the adsorption capacity of the biosorbents [42].…”

Section: Effect Of Adsorption Parameters On Biosorptionmentioning

confidence: 99%

Adsorption of Cd (II) by a novel living and non-living Cupriavidus necator GX_5: optimization, equilibrium and kinetic Studies

Xiao

Shao

et al. 2023

Preprint

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Biosorbents have been extensively studied for heavy metal adsorption due to their advantages of low cost and high efficiency. In the study, the living and non-living biomass of Cupriavidus necator GX_5 previously isolated were evaluated for their adsorption capacity and/or removal efficiency for Cd (II) through batch experiments, SEM and FT-IR investigations. The maximum removal efficiency rates for the live and dead biomass were 60.51% and 78.53%, respectively, at an optimum pH of 6, a dosage of 1 g/L and an initial Cd (II) concentration of 5 mg/L. The pseudo-second-order kinetic model was more suitable for fitting the experimental data, indicating that the rate-limiting step might be chemisorption. The Freundlich isotherm model fit better than the Langmuir isotherm model, implying that the adsorption process of both biosorbents was heterogeneous. FT-IR observation reflected that various functional groups were involved in Cd (II) adsorption: -OH, -NH, C=O, C-O and C-C groups for the living biomass and -OH, -NH, C-H, C=O, C-N and N-H groups for the dead biomass. Our results imply that non-living biosorbents have a higher capacity and stronger strength for absorbing Cd (II) than living biomass. Therefore, we suggest that dead GX_5 is a promising adsorbent and can be used in Cd (II)-contaminated environments.

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

Cited by 19 publications

References 33 publications

Biosorption of Cd+2 and Pb+2 by Exopolysaccharide Extracted from Lactobacillus fermentum 6b; Adsorption Isotherm and Kinetic Studies

Biosorption of Cd+2 and Pb+2 by Exopolysaccharide Extracted from Lactobacillus fermentum 6b; Adsorption Isotherm and Kinetic Studies

Harnessing the Potential of Bacillus altitudinis MT422188 for Copper Bioremediation

Adsorption of Cd (II) by a novel living and non-living Cupriavidus necator GX_5: optimization, equilibrium and kinetic Studies

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