GO crosslinked hydrogel nanocomposites of chitosan/carboxymethyl cellulose – A versatile adsorbent for the treatment of dyes contaminated wastewater

Hemant Mittal, Ali Al Alili, Pranay P. Morajkar, Saeed M. Alhassan

Research output: Contribution to journalArticlepeer-review

96 Scopus citations

Abstract

Graphene oxide (GO) crosslinked nanocomposites hydrogels (NCH) of chitosan (CS) and carboxymethyl cellulose (CMC) were synthesized and the feasibility of its application as a versatile adsorbent for the remediation of cationic (methylene blue, MB) as well as anionic (methyl orange, MO) dyes contaminated wastewater was explored. Initially, GO was functionalized with vinyltriethoxysilane which was subsequently used as a chemical crosslinker to synthesize the NCH of CS and CMC (CS/CMC-NCH) with the polymeric mixture of diallyldimethylammonium chloride and 2-acrylamido-2-methyl-1-propanesulfonic acid. About 99% dye was adsorbed from 50 mg/L dye solution of MB dye with 0.4 g/L of CS/CMC-NCH at pH 7, whereas, for MO about 82% dye was adsorbed with 0.6 g/L of CS/CMC-NCH at pH 3. The Adsorption of both dyes is well explained using pseudo-second-order and Langmuir models with the maximum adsorption capacities of 655.98 mgdye/gads for MB and 404.52 mgdye/gads for MO. Thermodynamics studies suggested spontaneous and exothermic nature of the adsorption process with values of ΔS < 0 and ΔH > 0. Furthermore, CS/CMC-NCH showed excellent regeneration capacity for continuous twenty cycles of adsorption-desorption. Therefore, the synthesized CS/CMC-NCH is a versatile adsorbent that can treat both anionic and cationic dyes contaminated wastewater.

Original languageBritish English
Pages (from-to)1248-1261
Number of pages14
JournalInternational Journal of Biological Macromolecules
Volume167
DOIs
StatePublished - 15 Jan 2021

Keywords

  • Adsorption isotherm
  • Dyes adsorption
  • Hydrogel nanocomposites

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