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Biosorptive uptake of Fe(2+), Cu(2+) and As(5+) by activated biochar derived from Colocasia esculenta: Isotherm, kinetics, thermodynamics, and cost estimation.

Banerjee S, Mukherjee S, LaminKa-Ot A, Joshi SR, Mandal T, Halder G - J Adv Res (2016)

Bottom Line: Adsorption of Fe(2+), Cu(2+) and As(5+) on to SSAB was found to be governed by pseudo-second order kinetic model.Regeneration of metal desorbed SSAB with 1 N sodium hydroxide maintained its effectiveness towards multiple metal adsorption cycles.Cost estimation of SSAB production substantiated its cost effectiveness as compared to commercially available activated carbon.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical Engg, National Institute of Technology Durgapur, West Bengal, India.

ABSTRACT
The adsorptive capability of superheated steam activated biochar (SSAB) produced from Colocasia esculenta was investigated for removal of Cu(2+), Fe(2+) and As(5+) from simulated coal mine wastewater. SSAB was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and Brunauer-Emmett-Teller analyser. Adsorption isotherm indicated monolayer adsorption which fitted best in Langmuir isotherm model. Thermodynamic study suggested the removal process to be exothermic, feasible and spontaneous in nature. Adsorption of Fe(2+), Cu(2+) and As(5+) on to SSAB was found to be governed by pseudo-second order kinetic model. Efficacy of SSAB in terms of metal desorption, regeneration and reusability for multiple cycles was studied. Regeneration of metal desorbed SSAB with 1 N sodium hydroxide maintained its effectiveness towards multiple metal adsorption cycles. Cost estimation of SSAB production substantiated its cost effectiveness as compared to commercially available activated carbon. Hence, SSAB could be a promising adsorbent for metal ions removal from aqueous solution.

No MeSH data available.


SEM image of (a) raw adsorbent and after adsorption of (b) Fe2+ (c) Cu2+ and (d) As5+.
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f0005: SEM image of (a) raw adsorbent and after adsorption of (b) Fe2+ (c) Cu2+ and (d) As5+.

Mentions: Surface morphological analysis of the adsorbent before and after adsorption was performed in a scanning electron microscope (SEM) (JEOL JSM-6030, Kolkata, India). Before analysis, the samples were coated with palladium (8 nm of thickness) at an application rate of 30 mA for 30 s. Coating of sample was done to enhance the conductivity of the sample under SEM. The sample was coated inside an auto fine coater (JEOL JFC 1600, JEOL INDIA PVT. Ltd., Kolkata, India) followed by drying of the sample using infra red (IR) lamp before it was analysed. SEM images as shown in Fig. 1a–d of SSAB both before and after adsorption for each of Fe2+, Cu2+ and As5+ provide a clear image of numerous pores and greyish crystals of metal ion bonds present on the surface of SSAB. After superheated steam activation, the adsorbent surface was modified with irregular clusters of numerous minute honey comb-like structures making wide space for adhesion. The honey comb-like structures formed were void in nature and were filled with metal ions all along the pores present on the adsorbent surface.


Biosorptive uptake of Fe(2+), Cu(2+) and As(5+) by activated biochar derived from Colocasia esculenta: Isotherm, kinetics, thermodynamics, and cost estimation.

Banerjee S, Mukherjee S, LaminKa-Ot A, Joshi SR, Mandal T, Halder G - J Adv Res (2016)

SEM image of (a) raw adsorbent and after adsorption of (b) Fe2+ (c) Cu2+ and (d) As5+.
© Copyright Policy - CC BY-NC-ND
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4933041&req=5

f0005: SEM image of (a) raw adsorbent and after adsorption of (b) Fe2+ (c) Cu2+ and (d) As5+.
Mentions: Surface morphological analysis of the adsorbent before and after adsorption was performed in a scanning electron microscope (SEM) (JEOL JSM-6030, Kolkata, India). Before analysis, the samples were coated with palladium (8 nm of thickness) at an application rate of 30 mA for 30 s. Coating of sample was done to enhance the conductivity of the sample under SEM. The sample was coated inside an auto fine coater (JEOL JFC 1600, JEOL INDIA PVT. Ltd., Kolkata, India) followed by drying of the sample using infra red (IR) lamp before it was analysed. SEM images as shown in Fig. 1a–d of SSAB both before and after adsorption for each of Fe2+, Cu2+ and As5+ provide a clear image of numerous pores and greyish crystals of metal ion bonds present on the surface of SSAB. After superheated steam activation, the adsorbent surface was modified with irregular clusters of numerous minute honey comb-like structures making wide space for adhesion. The honey comb-like structures formed were void in nature and were filled with metal ions all along the pores present on the adsorbent surface.

Bottom Line: Adsorption of Fe(2+), Cu(2+) and As(5+) on to SSAB was found to be governed by pseudo-second order kinetic model.Regeneration of metal desorbed SSAB with 1 N sodium hydroxide maintained its effectiveness towards multiple metal adsorption cycles.Cost estimation of SSAB production substantiated its cost effectiveness as compared to commercially available activated carbon.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical Engg, National Institute of Technology Durgapur, West Bengal, India.

ABSTRACT
The adsorptive capability of superheated steam activated biochar (SSAB) produced from Colocasia esculenta was investigated for removal of Cu(2+), Fe(2+) and As(5+) from simulated coal mine wastewater. SSAB was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and Brunauer-Emmett-Teller analyser. Adsorption isotherm indicated monolayer adsorption which fitted best in Langmuir isotherm model. Thermodynamic study suggested the removal process to be exothermic, feasible and spontaneous in nature. Adsorption of Fe(2+), Cu(2+) and As(5+) on to SSAB was found to be governed by pseudo-second order kinetic model. Efficacy of SSAB in terms of metal desorption, regeneration and reusability for multiple cycles was studied. Regeneration of metal desorbed SSAB with 1 N sodium hydroxide maintained its effectiveness towards multiple metal adsorption cycles. Cost estimation of SSAB production substantiated its cost effectiveness as compared to commercially available activated carbon. Hence, SSAB could be a promising adsorbent for metal ions removal from aqueous solution.

No MeSH data available.