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15-01-2021 | Original Research

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

Authors: Simin Asadabadi, Zohreh Merati

Published in: Cellulose | Issue 4/2021

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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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Title: A tailored magnetic composite synthesized by graphene oxide, chitosan and aminopolycarboxylic acid for diminishing dye contaminant
Authors: Simin Asadabadi
Zohreh Merati
Publication date: 15-01-2021
Publisher: Springer Netherlands
Published in: Cellulose / Issue 4/2021
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI: https://doi.org/10.1007/s10570-020-03623-7

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