Issue 22, 2018, Issue in Progress
From the journal:

RSC Advances

Eco-friendly synthesis of graphene–chitosan composite hydrogel as efficient adsorbent for Congo red†

Sakineh Omidia  and  Ali Kakanejadifard ORCID logo *a  

* Corresponding authors

a Faculty of Science, Department of Chemistry, Lorestan University, Khorramabad, Iran
E-mail: ali.kakanejadifard@gmail.com

Abstract

A simple approach was utilized to synthesize graphene/chitosan-based hydrogel using glutaraldehyde as crosslinking agent in room temperature. The composite aerogel was used for removal of cationic and anionic dyes from aqueous solution. It showed high adsorption capacity towards Congo red as an anionic dye. Adsorption experiments were performed based on various parameters, such as initial Congo red concentration, solution pH and contact time. The kinetics data were analyzed using four different models and the pseudo-second-order model best described the adsorption of Congo red aerogel. The Equilibrium adsorption isotherm data indicated that equilibrium data were fitted to the Langmuir isotherm. The maximum dye adsorption capacity calculated from the Langmuir isotherm equation was 384.62 mg g−1. Moreover, the aerogel was stable and easily recovered, and adsorption capacity was about 100% of the initial saturation adsorption capacity after being used three times.

Graphical abstract: Eco-friendly synthesis of graphene–chitosan composite hydrogel as efficient adsorbent for Congo red

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Article information

DOI
https://doi.org/10.1039/C8RA00510A
Article type
Paper
Submitted
17 Jan 2018
Accepted
22 Mar 2018
First published
28 Mar 2018
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2018,8, 12179-12189

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Eco-friendly synthesis of graphene–chitosan composite hydrogel as efficient adsorbent for Congo red

S. Omidi and A. Kakanejadifard, RSC Adv., 2018, 8, 12179 DOI: 10.1039/C8RA00510A

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