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- Title
The removal of methyl violet dye from wastewater by L-cysteine-reduced graphene oxide nanocomposite: kinetic and thermodynamic studies.
- Authors
Fathalipour, Soghra; Pourbeyram, Sima; Miandoab, Sahar Chodar
- Abstract
In this study, the adsorption of methyl violet (MV) onto biocompatible reduced graphene oxide nanocomposite was investigated. The covalent modification of GO with L-cysteine-hydrochloride in the presence of N, N-dicyclohexylcarbohydramide (DCC) obtained L-cysteine-reduced graphene oxide nanocomposite (L-cys-rGO). Fabricated nanocomposite was analyzed using standard characterization tools and techniques, viz. UV–Vis, XRD, FT-IR, and SEM. FT-IR results confirmed covalent modification of GO with L-cysteine. In adsorption dye studies, the effect of initial dye concentration, adsorbent dosage, contact time, and the temperature was investigated. 91% dye removal was performed by 20 mg/L of nanocomposite at pH 7, contact time of 5 min, MV concentration of 10 μM at 25°C. The kinetic study displayed that the adsorption data were fitted with the quasi-second-order model (0.984), and the equilibrium behavior of the adsorption followed the Langmuir model. Furthermore, the thermodynamic studies revealed that the adsorption of MV using L-cys-rGO nanocomposite is exothermic (ΔH = − 12.972 kJ/mol) and spontaneous (ΔS = − 0.027 kJ/mol.K). According to the obtained results, the synthesized nanocomposite can be used to treat industrial effluents and polluted waters.
- Subjects
GENTIAN violet; GRAPHENE oxide; LANGMUIR isotherms; NANOCOMPOSITE materials; INDUSTRIAL wastes; SEWAGE; LEAD removal (Sewage purification)
- Publication
Journal of the Iranian Chemical Society, 2023, Vol 20, Issue 6, p1395
- ISSN
1735-207X
- Publication type
Article
- DOI
10.1007/s13738-023-02764-3