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Titre: | Flower‑Like Layered Double Hydroxides for the Adsorption of Azocarmine G: Kinetic, Isotherm, and Thermodynamic Studies |
Auteur(s): | Meguellati, Zineb Ghemmi, Naima Brahimi, Razika |
Mots-clés: | Adsorption Azo carmine G Clay materials Isotherm modals Layered double hydroxide |
Date de publication: | 2023 |
Editeur: | Springer |
Collection/Numéro: | Water Air Soil Pollut (2023);pp. 234-621 |
Résumé: | The current research includes the adsorp-
tion behavior of two flower-like layered double
hydroxides (MgAl-LDH and MgFe-LDH) synthe-
sized via co-precipitation method for the environ-
mental remediation. The synthesized materials were
characterized by several techniques like X-ray diffrac-
tion (XRD), Fourier Transform Infrared spectrom-
etry (FTIR), scanning electron microscopy (SEM),
Thermogravimetric analysis (TGA), differential ther-
mogravimetry (DTG), and differential scanning calo-
rimetry (DSC). The materials were also characterized
by Brunauer-Emmett-Teller (BET) technique, and the
obtained surface areas were 65.50 m2
·g−1 and 51.43
m2
·g−1 for MgAl-LDH and MgFe-LDH, respectively.
The materials were tested for the adsorption removal
of azocarmine G dye from aqueous medium; the
experimental parameters, including the pH, the initial
concentration, the adsorbent dose, and the time, were
optimized to attain a maximum adsorption capacity of
105.9 mg·g−1 and 101.6 mg·g−1 for MgAl-LDH and
MgFe-LDH, respectively, which confirms that the
materials can be used for the effective dye removal.
The kinetic study revealed that the pseudo-second
order fitted well the adsorption process, and the iso-
therms conformed well to the Langmuir model. The
effect of temperature allowed to calculate the follow-
ing thermodynamic parameters: ΔHMgAl°=12.083
KJ·mol−1
; ΔHMgFe°=25.053 KJ·mol−1
; ΔSMgAl°=43.81
JK−1
·mol−1
; and ΔSMgFe°=87.75 JK−1
·mol−1
. |
URI/URL: | https://doi.org/10.1007/s11270-023-06565-5 http://dlibrary.univ-boumerdes.dz:8080/handle/123456789/13298 |
Collection(s) : | Publications Nationales
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