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

SRI LAKSHMI RAMYA KRISHNA KANAMARLAPUDI

SRI LAKSHMI RAMYA KRISHNA KANAMARLAPUDI

Department of Biotechnology, Koneru Lakshmaiah Education Foundation (KLEF)Greenfields, Vaddeswaram, Guntur, Andhra Pradesh, India
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KRISHNA KANAMARLAPUDI, SRI LAKSHMI RAMYA
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SUDHAMANI MUDDADA

SUDHAMANI MUDDADA

Department of Biotechnology, Koneru Lakshmaiah Education Foundation (KLEF)Greenfields, Vaddeswaram, Guntur, Andhra Pradesh, India
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MUDDADA, SUDHAMANI
  
05 dic 2019
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Categoria dell'articolo: original-paper
Pubblicato online: 05 dic 2019
Pagine: 549 - 558
Ricevuto: 09 giu 2019
Accettato: 11 nov 2019
DOI: https://doi.org/10.33073/pjm-2019-057
Parole chiave
© 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.

Fig. 1.

Effect of initial concentration on biosorption of Fe (II) by Bacillus subtilis at a biomass concentration of 1 g/l, pH 4.5, and 100 rpm.
Effect of initial concentration on biosorption of Fe (II) by Bacillus subtilis at a biomass concentration of 1 g/l, pH 4.5, and 100 rpm.

Fig. 2.

Effect of contact time on biosorption Fe (II) by Bacillus subtilis at a biomass concentration of 1 g/l, pH 4.5, 20 mg/l of Fe (II) and 100 rpm.
Effect of contact time on biosorption Fe (II) by Bacillus subtilis at a biomass concentration of 1 g/l, pH 4.5, 20 mg/l of Fe (II) and 100 rpm.

Fig. 3.

Effect of biosorbent dose on biosorption Fe (II) by Bacillus subtilis at initial metal ion concentration of 20 mg/l, pH 4.5, and 100 rpm.
Effect of biosorbent dose on biosorption Fe (II) by Bacillus subtilis at initial metal ion concentration of 20 mg/l, pH 4.5, and 100 rpm.

Fig. 4.

SEM image, EDX spectra and elemental composition of unloaded (control) biomass of B. subtilis.
SEM image, EDX spectra and elemental composition of unloaded (control) biomass of B. subtilis.

Fig. 5.

SEM image, EDX spectra and elemental composition of B. subtilis biosorbed with Fe (II) ions.
SEM image, EDX spectra and elemental composition of B. subtilis biosorbed with Fe (II) ions.

Fig. 6a.

FTIR spectra of unloaded (control) biomass of B. subtilis.
FTIR spectra of unloaded (control) biomass of B. subtilis.

Fig. 6b.

FTIR spectra of Fe (II) ion biosorbed by B. subtilis biomass.
FTIR spectra of Fe (II) ion biosorbed by B. subtilis biomass.

Fig. 7a.

X-ray diffraction pattern of B. subtilis before biosorption with Fe (II) ions.
X-ray diffraction pattern of B. subtilis before biosorption with Fe (II) ions.

Fig. 7b.

X-ray diffraction pattern of B. subtilis after biosorption with Fe (II) ions.
X-ray diffraction pattern of B. subtilis after biosorption with Fe (II) ions.

Fig. 8.

Point zero charge (pHpzc) of B. subtilis.
Point zero charge (pHpzc) of B. subtilis.

Constants of Langmuir, Freundlich and Temkin isotherm models used for the biosorption of Fe (II) ions onto B_ subtilis biomass_

Langmuir isothermFreundlich isothermTemkin isotherm
qmax (mg/g)3.831n3.425B (J/mol)1.3583
KL (l/mg)1.845KF (mg/g)2.766A (l/g)6.78 g/l
R20.9353R20.9057R20.8715
RL0.013

Constants of pseudo-first and pseudo-second-order kinetic models obtained for the biosorption of Fe (II) ions onto B_ subtilis_

Pseudo-first-order kinetic modelPseudo-second-order kinetic model
qe (mg/g),K1 (min–1)R2qe (mg/g)K2 (gmg–1 min–1)R2
10.60.20010.920117.760.00420.7154
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