Functionalization of magnetic chitosan with graphene oxide for removal of cationic and anionic dyes from aqueous solution. (5th November 2016)

• Record Type: Journal Article
• Authors: Gul, Kashif; Sohni, Saima; Waqar, Muttaqia; Ahmad, Faiza; Norulaini, N.A. Nik; A. K., Mohd. Omar
• Is Part Of: Carbohydrate polymers. Volume 152(2016)
• Page Start: 520
• Page End: 531
• Publication Date: 2016-11-05
• Subjects: Chitosan -- Graphite powder -- Glutaraldehyde -- Potassium permanganate -- Sulfuric acid -- Sodium nitrate -- Sodium hydroxide; Environmental remediation -- Dyes -- Fe3O4 supported chitosan-graphene oxide composite -- Isotherm -- Thermodynamic parameters -- Applications; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2016.06.045
• Languages: English
• ISSNs: 0144-8617

Abstract

Graphical abstract: Highlights: Synthesized Fe3 O4 supported chitosan-graphene oxide composite. Studied removal of both cationic and anionic dyes as textile effluents are complex mixtures. Evaluated kinetic, equilibrium and thermodynamic aspects. From practical utility perspective, ionic strength and recyclability studies were undertaken. Application to the clean-up of spiked real samples showed promising results. Abstract: In the present study, we decorated chitosan (©) with Fe3 O4 nanoparticles followed by cross-linking with GO to prepare Fe3 O4 supported chitosan-graphene oxide composite (Fe3 O4 ©-GO). Different properties of synthesized material were investigated by SEM, XRD, FTIR, TGA and EDX. Batch adsorption experiments were performed to remove toxic cationic and anionic dyes from industrial wastewater. To maximize removal efficiency of composite material, effect of pH (4–12), time (0–80 min), Fe3 O4 ©-GO dosage (2–10 mg), initial dye concentration (2–30 μg mL̄ 1 ) and temperature (303, 313, and 323 K) were studied. The uptake of dyes presented relatively fast adsorption kinetics with pseudo-second-order equation as the best fitting model. To understand the interaction of dye with adsorbent, Langmuir and Freundlich isotherm were applied. Thermodynamic studies were conducted to calculate the changes in free energy (Δ G 0 ), enthalpy (Δ H 0 ) and entropy (Δ S 0 ). In view of practical application, the influence of ionic strength, recycling as well as investigations based on percent recoveries from spiked real water samples were also taken into account.