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A tailored magnetic composite synthesized by graphene oxide, chitosan and aminopolycarboxylic acid for diminishing dye contaminant

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Abstract

This research study aims to remove methyl violet from aqueous solutions with a novel composite. The composite was synthesized by magnetite nanoparticles decorated with amino-silane, graphene oxide, and grafted chitosan-diethylenetriaminepentaacetic acid. The adsorbent was characterized by FT-IR, XRD, FESEM, TEM, EDX, elemental mapping, TGA, VSM, and BET. The Central Composite Design was used for planning the adsorption experiments. The maximum dye removal was equal to 94.87% for an initial dye concentration of 10.0 mg L−1. The coulombic attraction, H-bonding, and pi stacking interactions were proposed as the key factors for dye removal. The initial pH and temperature were fixed at 9.8 and 52.3 °C and the adsorbent dosage was 2.0 g L−1 in the kinetics and equilibrium studies. The adsorption process was almost completed within five min. The modified pseudo-n-order model was the best equation to fit the kinetics data. It was demonstrated that film diffusion was the rate-limiting step at the initial stages of dye removal after which the dye adsorption was the rate-determining step. The equilibrium data was fitted by modified Langmuir–Freundlich isotherm and the maximum equilibrium adsorption was 243.8 mg g−1. Besides, the composite recovery was done by a low amount of acidic eluent. The adsorption efficiency did not change even after five desorption-adsorption cycles.

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Abbreviations

APTES:

3-Aminopropyltriethoxysilane

CS:

Chitosan

DTPA:

Diethylenetriaminepentaacetic acid

GO:

Graphene oxide

MV:

Methyl violet

NHS:

N-hydroxysuccinimide

DCC:

N,N′-dicyclohexylcarbodiimide

DMF:

N,N-dimethylformamide

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Acknowledgments

The authors extend their gratitude to Bu-Ali Sina University for supporting this work.

Funding

This study was funded by Bu-Ali Sina University (Grant No. 95-287).

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Authors and Affiliations

Authors

Contributions

SA: Conceptualization, Methodology, Funding acquisition, Project administration, Writing—original draft, Writing—review and editing. ZM: Investigation, Validation, Writing—original draft.

Corresponding author

Correspondence to Simin Asadabadi.

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The authors declare that they have no conflict of interest.

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It is declared that this manuscript is containing original research, and has not been published in any journal, and is not being simultaneously considered for publication elsewhere. Submission of this paper has been made with full responsibility, based on the journal requirements, and there are no plagiarism and concerns about animal or human experimentation. The manuscript has been approved by authors who have significantly contributed and agreed with its submission to Cellulose.

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Asadabadi, S., Merati, Z. A tailored magnetic composite synthesized by graphene oxide, chitosan and aminopolycarboxylic acid for diminishing dye contaminant. Cellulose 28, 2327–2351 (2021). https://doi.org/10.1007/s10570-020-03623-7

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  • DOI: https://doi.org/10.1007/s10570-020-03623-7

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