Nithya Priya, V and Rajkumar, M. and Mobika, J and Linto Sibi, S P (2022) Adsorption of As (V) ions from aqueous solution by carboxymethyl cellulose incorporated layered double hydroxide/reduced graphene oxide nanocomposites: Isotherm and kinetic studies. Environmental Technology & Innovation. pp. 1-15. ISSN 2352-1864

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Abstract

Efficient nanocomposite adsorbents were synthesized based on carboxymethyl cellulose
(CE) incorporated Fe–Al layered double hydroxide/reduced graphene oxide (FAH-rGO/CE)
for the adsorption of Arsenate (As (V)) ions in wastewater. Synthesized products were
characterized by XRD (X-ray diffraction), FESEM (Field Emission Scanning Electron
Microscopy), HRTEM (High Resolution Transmission Electron Microscopy), FTIR (Fourier
Transform Infrared spectroscopy) and N2 adsorption–desorption analysis. The incorporation of CE moieties on FAH-rGO composites evidently improved the active sites on
boundary layer and As (V) removal capacity (98%) thereby enhancing the surface area
of composites (156.24 m2
g
−1
). Various parameters affecting the adsorption such as
adsorbent dosages (0.01–0.1 g/L), contact time of adsorption (60–600 min) and effect
of pH (2–11) were optimized using batch adsorption techniques. Adsorption isotherms
were well fitted to the Langmuir isotherm model (correlation coefficient R2≥ 0.9991) to
prove the monolayer adsorption of As (V) ions on the adsorbent surface. The maximum
adsorption capacity (qmax) of FAH-rGO, FAH-rGO/CE-1 and FAH-rGO/CE-4 were found to
be 115.39, 170.36 and 258.39 mg g−1
, respectively. Adsorption kinetics was calculated by
following the pseudo-second-order model with high correlation coefficient (R2≥ 0.9996)
value. In addition, the effect of pH, FTIR and EDS analysis revealed that the possible
mechanism between the As (V) and CE composites was the electrostatic interactions with
-OH and -COOH groups. Furthermore, FAH-rGO/CE adsorbent exposed good reusability
even after five consecutive cycles (from 96% to 88%) with high stability. Thus, synthesized
FAH-rGO/CE composites could be potentially used as an efficient adsorbent for As (V)
adsorption in wastewater.

Item Type: Article
Uncontrolled Keywords: Reduced graphene oxide Layered double hydroxide Carboxymethyl cellulose As (V) adsorption Isotherms and kinetics
Divisions: PSG College of Arts and Science > Department of Physics
Depositing User: Mr Team Mosys
Date Deposited: 20 Oct 2022 07:04
Last Modified: 20 Oct 2022 07:04
URI: http://ir.psgcas.ac.in/id/eprint/1608

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