Magnetic chitosan-GO nanocomposite: Synthesis, characterization and batch adsorber design for Cr(VI) removal

Sushanta Debnath; Arjun Maity; Kriveshini Pillay

doi:10.1016/j.jece.2014.03.012

Magnetic chitosan-GO nanocomposite: Synthesis, characterization and batch adsorber design for Cr(VI) removal

Sushanta Debnath, Arjun Maity, Kriveshini Pillay

Chemical Sciences

Research output: Contribution to journal › Article › peer-review

129 Citations (Scopus)

Abstract

Abstract A magnetically modified graphene oxide-chitosan composite was synthesized and exploited for removal of chromium(VI). The composite material was characterized by BET, SEM, TEM, XRD and FTIR. The optimum pH was 3.0 (±0.1). Film diffusion and pseudo-second-order equation governs the overall kinetics. Langmuir and Redlich-Peterson isotherms describe the experimental data. Negative ΔG° (-15.49 to -15.67 kJ mol^-1) with positive ΔH° (11.29 kJ mol^-1) indicated spontaneous and endothermic reaction. Optimum regenerate solution is 0.05 M NaOH and spent adsorbents could be reused up to 5th cycle of regeneration, where the composite retained its adsorption capacity ̃92% of its original. A single stage batch adsorber is proposed for removal of Cr(VI) concentration up to 0.05 mg L ^-1.

Original language	English
Pages (from-to)	963-973
Number of pages	11
Journal	Journal of Environmental Chemical Engineering
Volume	2
Issue number	2
DOIs	https://doi.org/10.1016/j.jece.2014.03.012
Publication status	Published - Jun 2014

Keywords

Chromium(VI)
Isotherm
Kinetics
Magnetic chitosan graphene composite
Regeneration
Single stage batch adsorber

ASJC Scopus subject areas

Chemical Engineering (miscellaneous)
Waste Management and Disposal
Pollution
Process Chemistry and Technology

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10.1016/j.jece.2014.03.012

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title = "Magnetic chitosan-GO nanocomposite: Synthesis, characterization and batch adsorber design for Cr(VI) removal",

abstract = "Abstract A magnetically modified graphene oxide-chitosan composite was synthesized and exploited for removal of chromium(VI). The composite material was characterized by BET, SEM, TEM, XRD and FTIR. The optimum pH was 3.0 (±0.1). Film diffusion and pseudo-second-order equation governs the overall kinetics. Langmuir and Redlich-Peterson isotherms describe the experimental data. Negative ΔG° (-15.49 to -15.67 kJ mol-1) with positive ΔH° (11.29 kJ mol-1) indicated spontaneous and endothermic reaction. Optimum regenerate solution is 0.05 M NaOH and spent adsorbents could be reused up to 5th cycle of regeneration, where the composite retained its adsorption capacity{\~ }92% of its original. A single stage batch adsorber is proposed for removal of Cr(VI) concentration up to 0.05 mg L -1.",

keywords = "Chromium(VI), Isotherm, Kinetics, Magnetic chitosan graphene composite, Regeneration, Single stage batch adsorber",

author = "Sushanta Debnath and Arjun Maity and Kriveshini Pillay",

year = "2014",

month = jun,

doi = "10.1016/j.jece.2014.03.012",

language = "English",

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pages = "963--973",

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TY - JOUR

T1 - Magnetic chitosan-GO nanocomposite

T2 - Synthesis, characterization and batch adsorber design for Cr(VI) removal

AU - Debnath, Sushanta

AU - Maity, Arjun

AU - Pillay, Kriveshini

PY - 2014/6

Y1 - 2014/6

N2 - Abstract A magnetically modified graphene oxide-chitosan composite was synthesized and exploited for removal of chromium(VI). The composite material was characterized by BET, SEM, TEM, XRD and FTIR. The optimum pH was 3.0 (±0.1). Film diffusion and pseudo-second-order equation governs the overall kinetics. Langmuir and Redlich-Peterson isotherms describe the experimental data. Negative ΔG° (-15.49 to -15.67 kJ mol-1) with positive ΔH° (11.29 kJ mol-1) indicated spontaneous and endothermic reaction. Optimum regenerate solution is 0.05 M NaOH and spent adsorbents could be reused up to 5th cycle of regeneration, where the composite retained its adsorption capacity ̃92% of its original. A single stage batch adsorber is proposed for removal of Cr(VI) concentration up to 0.05 mg L -1.

AB - Abstract A magnetically modified graphene oxide-chitosan composite was synthesized and exploited for removal of chromium(VI). The composite material was characterized by BET, SEM, TEM, XRD and FTIR. The optimum pH was 3.0 (±0.1). Film diffusion and pseudo-second-order equation governs the overall kinetics. Langmuir and Redlich-Peterson isotherms describe the experimental data. Negative ΔG° (-15.49 to -15.67 kJ mol-1) with positive ΔH° (11.29 kJ mol-1) indicated spontaneous and endothermic reaction. Optimum regenerate solution is 0.05 M NaOH and spent adsorbents could be reused up to 5th cycle of regeneration, where the composite retained its adsorption capacity ̃92% of its original. A single stage batch adsorber is proposed for removal of Cr(VI) concentration up to 0.05 mg L -1.

KW - Chromium(VI)

KW - Isotherm

KW - Kinetics

KW - Magnetic chitosan graphene composite

KW - Regeneration

KW - Single stage batch adsorber

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DO - 10.1016/j.jece.2014.03.012

M3 - Article

AN - SCOPUS:84897459167

SN - 2213-2929

VL - 2

SP - 963

EP - 973

JO - Journal of Environmental Chemical Engineering

JF - Journal of Environmental Chemical Engineering

IS - 2

ER -

Magnetic chitosan-GO nanocomposite: Synthesis, characterization and batch adsorber design for Cr(VI) removal

Abstract

Keywords

ASJC Scopus subject areas

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