Izvorni znanstveni članak
https://doi.org/10.15255/CABEQ.2016.872
Effective Removal of Hexavalent Chromium from Aqueous Solutions Using Ionic Liquid Modified Graphene Oxide Sorbent
A. Nasrollahpour
; Young Researchers and Elite Club, Sari Branch, Islamic Azad University, Sari, Iran
S. E. Moradi
orcid.org/0000-0002-6729-5646
; Young Researchers and Elite Club, Sari Branch, Islamic Azad University, Sari, Iran
J. Khodaveisi
; Department of Science, Sari Branch, Islamic Azad University, Sari, Iran
Sažetak
Ionic liquid modified reduced graphene oxide (IL-rGO) was prepared and examined for chromate removal. The sorbent was characterized by N2 adsorption-desorption measurement (BET), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) analysis. The sorption behavior of
chromate on the ionic liquid modified reduced graphene oxide sorbent from an aqueous medium was studied by varying the parameters such as contact time, initial chromate concentration, pH, and agitation speed. The results showed that sorption kinetics of chromate by IL-rGO follows the pseudo second order, which indicates that the sorption mechanism is both chemical and physical interaction. The sorption isotherm studies revealed that Langmuir model provided the best fit to all the experimental data with an adsorption capacity of 232.55 mg g–1 for IL-rGO. Thermodynamic parameters, such as
Gibbs free energy (–2.85 kJ mol–1 at 298 K), enthalpy (55.41 kJ mol–1), and entropy (11.64 J mol–1 K–1) of sorption of the chromate on ionic liquid modified reduced graphene oxide was evaluated, and it was found that the reaction was spontaneous and endothermic in nature.
This work is licensed under a Creative Commons Attribution 4.0 International License.
Ključne riječi
Langmuir isotherm; ionic liquid; reduced graphene oxide; chromate; removal
Hrčak ID:
187144
URI
Datum izdavanja:
4.10.2017.
Posjeta: 1.013 *