Chitosan/polyethylene glycol impregnated activated carbons: Synthesis, characterization and adsorption performance

doi:10.1007/s11705-017-1650-2

Front. Chem. Sci. Eng.

2017, Vol. 11

Issue (4) : 575-585 https://doi.org/10.1007/s11705-017-1650-2

RESEARCH ARTICLE

Chitosan/polyethylene glycol impregnated activated carbons: Synthesis, characterization and adsorption performance

Ehsan Salehi¹(

), Fereshteh Soroush¹, Maryam Momeni², Aboulfazl Barati¹, Ali Khakpour³

¹. Department of Chemical Engineering, Faculty of Engineering, Arak University, Arak 38156-8-8349, Iran
². Department of Electrical Engineering, Faculty of Engineering, Arak University, Arak 38156-8-8349, Iran
³. Arian Fan Azma Company, Tehran, Iran

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Abstract

Novel modified activated carbons (ACs) with enhanced adsorptive properties were obtained coating by chitosan (CS), polyethylene glycol (PEG) and blends of the two polymers (0:1, 1:0, 1:1, 1:2 and 2:1 wt/wt) on ACs by an impregnation technique. The adsorption performances of the pristine, acidified and polymer-impregnated ACs were studied using methylene blue as a model adsorbate. The adsorbents were characterized using Fourier transform infrared spectroscopy, scanning electron microscopy and abrasion hardness tests. The average coating thicknesses were between 10 to 23 microns. The pore sizes, pore densities and pore capacities of the activated carbons increased as the wt-% PEG in the coating increased. The highest adsorption capacity (424.7 mg/g) was obtained for the chitosan-coated ACs and this adsorption was well described by the Langmuir isotherm model. The kinetic results were best described by the pseudo-second-order kinetic model. The highest rate constant was obtained with the ACs modified with the CS:PEG (2:1) coating and this result was almost 2.6 times greater than that of the unmodified ACs. The CS/PEG impregnated ACs also displayed superior hardness (~90%), compared to unmodified ACs (~85%). Overall the chitosan had a greater effect on improving adsorption capacity whereas the polyethylene glycol enhanced the adsorption rate.

Keywords carbon biocomposites impregnation chitosan polyethylene glycol image processing

Corresponding Author(s): Ehsan Salehi

Just Accepted Date: 14 April 2017 Online First Date: 12 July 2017 Issue Date: 06 November 2017

Cite this article:

Ehsan Salehi,Fereshteh Soroush,Maryam Momeni, et al. Chitosan/polyethylene glycol impregnated activated carbons: Synthesis, characterization and adsorption performance[J]. Front. Chem. Sci. Eng., 2017, 11(4): 575-585.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-017-1650-2
https://academic.hep.com.cn/fcse/EN/Y2017/V11/I4/575

Fig.1 FTIR spectra of (a) AC, (b) Acidified AC, (c) AC/PEG, (d) AC/CS and (e) AC/CS/PEG 1:1

Fig.2 Original SEM micrographs (left) and fragmented processed images (right) for the pristine AC (a), AC/CS (b), AC/PEG (c) and AC/CS/PEG 1:1 (d)

Tab.1 Image processing results for different adsorbents

Tab.2 Separation factor, Gibbs free energy change and attrition hardness for the adsorbents

Fig.3 Removal of methylene blue by AC, AC/PEG, AC/CS and AC/CS/PEG with CS to PEG w/w ratios of 1: 1, 1:2 and 2:1

Fig.4 Isothermal adsorption of MB on different modified activated carbons

Tab.3 Equilibrium constants and correlation coefficients of Langmuir, Freundlich, and Redlich-Peterson isotherms for adsorption of MB on AC absorbents at 25 °C

Tab.4 Fitting results for pseudo-first-order and pseudo-second-order models for the adsorption of MB on various AC adsorbents (T = 25 °C, C₀ = 700 mg/L and pH= 7)

Fig.5 Influence of contact time on MB removal by AC, AC/PEG, AC/CS, AC/CS/PEG 1:1, 1:2 and 2:1 (pH= 7, initial MB concentration: 700 mg/L)

Fig.6 Influence of solution pH on adsorption of MB on AC, AC/CS and AC/CS/PEG 2:1 (C₀ = 50 mg/L)

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