New direct consecutive formation of spinel phase in (Fe,Co,Ni)Al2O4 composites for enhanced Pd(II) ions removal

N. F.M. Salleh, A. A. Jalil, S. Triwahyono, A. Ripin, S. M. Sidik, N. A.A. Fatah, N. Salamun, N. F. Jaafar, M. H. Hassim

Research output: Research - peer-reviewArticle

Abstract

Spinel (Fe,Co,Ni)Al2O4 composites (FeCoNiAl) were prepared by an introduction of Ni, Co and Fe ions into a γ-Al2O3 framework via a simple electrochemical method. The physicochemical properties of the catalysts were studied by XRD, N2 adsorption-desorption, TEM, MP-AES, FTIR, XPS, ESR, and VSM analyses. The characterization data showed that an altered arrangement of the γ-Al2O3 framework was observed with a different structure, particularly with a formation of metal oxides and spinel phases as a consequence of dealumination, isomorphous substitution and surface oxygen defects that contributed to the magnetism properties. The adsorptivity toward Pd2+ was in the following order: FeCoNiAl > CoNiAl > NiAl. A strong coercive fields possessed by hercynite (FeAl2O4) in the FeCoNiAl was found to play an important role in the adsorption. The detailed adsorption equilibrium isotherms, kinetic, thermodynamics, and optimization were also studied to clarify the related results. The equilibrium data were fitted using the Langmuir model with 0.1 g L−1 FeCoNiAl giving the maximum monolayer adsorption capacity (qm) of 303 mg g−1 at 303 K and pH 5. The adsorption kinetics were best described by the pseudo-first-order model. Thermodynamic studies showed that the adsorption was exothermic and not spontaneous at high temperatures. Optimization by response surface methodology (RSM) with a central composite design (CCD) model supported this result by demonstrating that the reaction temperature played an important role in the adsorption.

LanguageEnglish
Pages744-756
Number of pages13
JournalJournal of Alloys and Compounds
Volume727
DOIs
StatePublished - 15 Dec 2017

Fingerprint

Ions
Adsorption
Composite materials
spinell
Thermodynamics
Kinetics
Temperature
Magnetism
Oxides
Paramagnetic resonance
Isotherms
Monolayers
Desorption
Substitution reactions
X ray photoelectron spectroscopy
Metals
Oxygen
Transmission electron microscopy
Defects
Catalysts

Keywords

  • Adsorption
  • Dealumination
  • Electrochemical
  • Magnetism
  • Spinel
  • Surface oxygen defects

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

New direct consecutive formation of spinel phase in (Fe,Co,Ni)Al2O4 composites for enhanced Pd(II) ions removal. / Salleh, N. F.M.; Jalil, A. A.; Triwahyono, S.; Ripin, A.; Sidik, S. M.; Fatah, N. A.A.; Salamun, N.; Jaafar, N. F.; Hassim, M. H.

In: Journal of Alloys and Compounds, Vol. 727, 15.12.2017, p. 744-756.

Research output: Research - peer-reviewArticle

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abstract = "Spinel (Fe,Co,Ni)Al2O4 composites (FeCoNiAl) were prepared by an introduction of Ni, Co and Fe ions into a γ-Al2O3 framework via a simple electrochemical method. The physicochemical properties of the catalysts were studied by XRD, N2 adsorption-desorption, TEM, MP-AES, FTIR, XPS, ESR, and VSM analyses. The characterization data showed that an altered arrangement of the γ-Al2O3 framework was observed with a different structure, particularly with a formation of metal oxides and spinel phases as a consequence of dealumination, isomorphous substitution and surface oxygen defects that contributed to the magnetism properties. The adsorptivity toward Pd2+ was in the following order: FeCoNiAl > CoNiAl > NiAl. A strong coercive fields possessed by hercynite (FeAl2O4) in the FeCoNiAl was found to play an important role in the adsorption. The detailed adsorption equilibrium isotherms, kinetic, thermodynamics, and optimization were also studied to clarify the related results. The equilibrium data were fitted using the Langmuir model with 0.1 g L−1 FeCoNiAl giving the maximum monolayer adsorption capacity (qm) of 303 mg g−1 at 303 K and pH 5. The adsorption kinetics were best described by the pseudo-first-order model. Thermodynamic studies showed that the adsorption was exothermic and not spontaneous at high temperatures. Optimization by response surface methodology (RSM) with a central composite design (CCD) model supported this result by demonstrating that the reaction temperature played an important role in the adsorption.",
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AU - Salleh,N. F.M.

AU - Jalil,A. A.

AU - Triwahyono,S.

AU - Ripin,A.

AU - Sidik,S. M.

AU - Fatah,N. A.A.

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AU - Jaafar,N. F.

AU - Hassim,M. H.

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N2 - Spinel (Fe,Co,Ni)Al2O4 composites (FeCoNiAl) were prepared by an introduction of Ni, Co and Fe ions into a γ-Al2O3 framework via a simple electrochemical method. The physicochemical properties of the catalysts were studied by XRD, N2 adsorption-desorption, TEM, MP-AES, FTIR, XPS, ESR, and VSM analyses. The characterization data showed that an altered arrangement of the γ-Al2O3 framework was observed with a different structure, particularly with a formation of metal oxides and spinel phases as a consequence of dealumination, isomorphous substitution and surface oxygen defects that contributed to the magnetism properties. The adsorptivity toward Pd2+ was in the following order: FeCoNiAl > CoNiAl > NiAl. A strong coercive fields possessed by hercynite (FeAl2O4) in the FeCoNiAl was found to play an important role in the adsorption. The detailed adsorption equilibrium isotherms, kinetic, thermodynamics, and optimization were also studied to clarify the related results. The equilibrium data were fitted using the Langmuir model with 0.1 g L−1 FeCoNiAl giving the maximum monolayer adsorption capacity (qm) of 303 mg g−1 at 303 K and pH 5. The adsorption kinetics were best described by the pseudo-first-order model. Thermodynamic studies showed that the adsorption was exothermic and not spontaneous at high temperatures. Optimization by response surface methodology (RSM) with a central composite design (CCD) model supported this result by demonstrating that the reaction temperature played an important role in the adsorption.

AB - Spinel (Fe,Co,Ni)Al2O4 composites (FeCoNiAl) were prepared by an introduction of Ni, Co and Fe ions into a γ-Al2O3 framework via a simple electrochemical method. The physicochemical properties of the catalysts were studied by XRD, N2 adsorption-desorption, TEM, MP-AES, FTIR, XPS, ESR, and VSM analyses. The characterization data showed that an altered arrangement of the γ-Al2O3 framework was observed with a different structure, particularly with a formation of metal oxides and spinel phases as a consequence of dealumination, isomorphous substitution and surface oxygen defects that contributed to the magnetism properties. The adsorptivity toward Pd2+ was in the following order: FeCoNiAl > CoNiAl > NiAl. A strong coercive fields possessed by hercynite (FeAl2O4) in the FeCoNiAl was found to play an important role in the adsorption. The detailed adsorption equilibrium isotherms, kinetic, thermodynamics, and optimization were also studied to clarify the related results. The equilibrium data were fitted using the Langmuir model with 0.1 g L−1 FeCoNiAl giving the maximum monolayer adsorption capacity (qm) of 303 mg g−1 at 303 K and pH 5. The adsorption kinetics were best described by the pseudo-first-order model. Thermodynamic studies showed that the adsorption was exothermic and not spontaneous at high temperatures. Optimization by response surface methodology (RSM) with a central composite design (CCD) model supported this result by demonstrating that the reaction temperature played an important role in the adsorption.

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KW - Magnetism

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KW - Surface oxygen defects

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