Size and shape controlled of α-Fe2O3 nanoparticles prepared via sol–gel technique and their photocatalytic activity

Muneer M. Ba-Abbad, Mohd Sobri Takriff, Abdelbaki Benamor, Abdul Wahab Mohammad

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Abstract: Haematite (α-Fe2O3) nanoparticles (NPs) of different sizes and morphologies were prepared from two different iron precursors (iron acetate (A) and iron nitrate (N)) using the sol–gel technique, through a reaction with oxalic acid. A pure α-Fe2O3 phase (rhombohedral) that contained particles of different sizes and shapes were obtained from both iron precursors. Transmission electron microscope measurements showed average sizes of 23 ± 2 and 30 ± 2 nm for α-Fe2O3 (A) and α-Fe2O3 (N) formed NPs, respectively. The observed uniform spherical shape for the α-Fe2O3 (A) formed NPs is due to the presence of carboxylic acid (acetic acid) used to control the nucleation and growth process of α-Fe2O3 NPs. However, quasi-spherical particle shapes for α-Fe2O3 (N) were produced in the presence of a mineral acid (nitric acid), which caused the particles to be constrained during their growth step. However, the optical analysis showed that the band gaps of α-Fe2O3 (A) and α-Fe2O3 (N) as 2.63 and 2.60 eV were found, respectively. The surface area results exhibited that both α-Fe2O3 NPs were a porous material with a higher area for α-Fe2O3 (A), which resulted from the uniform shape and smaller size of particles. The magnetic properties were observed to be slightly different for both α-Fe2O3 NPs, which were also attributed to the different particle size of the NPs. Higher photocatalytic activity for congo red dye and 4-chlorophenol degradation under sunlight was achieved by α-Fe2O3 (A), which was attributed to the smaller size and higher surface area compared to α-Fe2O3 (N) NPs. Graphical Abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)1-14
Number of pages14
JournalJournal of Sol-Gel Science and Technology
DOIs
Publication statusAccepted/In press - 20 Oct 2016

Fingerprint

Nanoparticles
nanoparticles
Iron
iron
Oxalic Acid
Congo Red
Nitric Acid
oxalic acid
Oxalic acid
Hematite
nitric acid
porous materials
sunlight
Nitric acid
hematite
Carboxylic Acids
Carboxylic acids
acetic acid
Acetic acid
carboxylic acids

Keywords

  • Nanoparticles
  • Photocatalytic activity
  • Sol–gel
  • Sunlight
  • α-FeO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Chemistry(all)
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

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title = "Size and shape controlled of α-Fe2O3 nanoparticles prepared via sol–gel technique and their photocatalytic activity",
abstract = "Abstract: Haematite (α-Fe2O3) nanoparticles (NPs) of different sizes and morphologies were prepared from two different iron precursors (iron acetate (A) and iron nitrate (N)) using the sol–gel technique, through a reaction with oxalic acid. A pure α-Fe2O3 phase (rhombohedral) that contained particles of different sizes and shapes were obtained from both iron precursors. Transmission electron microscope measurements showed average sizes of 23 ± 2 and 30 ± 2 nm for α-Fe2O3 (A) and α-Fe2O3 (N) formed NPs, respectively. The observed uniform spherical shape for the α-Fe2O3 (A) formed NPs is due to the presence of carboxylic acid (acetic acid) used to control the nucleation and growth process of α-Fe2O3 NPs. However, quasi-spherical particle shapes for α-Fe2O3 (N) were produced in the presence of a mineral acid (nitric acid), which caused the particles to be constrained during their growth step. However, the optical analysis showed that the band gaps of α-Fe2O3 (A) and α-Fe2O3 (N) as 2.63 and 2.60 eV were found, respectively. The surface area results exhibited that both α-Fe2O3 NPs were a porous material with a higher area for α-Fe2O3 (A), which resulted from the uniform shape and smaller size of particles. The magnetic properties were observed to be slightly different for both α-Fe2O3 NPs, which were also attributed to the different particle size of the NPs. Higher photocatalytic activity for congo red dye and 4-chlorophenol degradation under sunlight was achieved by α-Fe2O3 (A), which was attributed to the smaller size and higher surface area compared to α-Fe2O3 (N) NPs. Graphical Abstract: [Figure not available: see fulltext.]",
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author = "Ba-Abbad, {Muneer M.} and Takriff, {Mohd Sobri} and Abdelbaki Benamor and Mohammad, {Abdul Wahab}",
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TY - JOUR

T1 - Size and shape controlled of α-Fe2O3 nanoparticles prepared via sol–gel technique and their photocatalytic activity

AU - Ba-Abbad, Muneer M.

AU - Takriff, Mohd Sobri

AU - Benamor, Abdelbaki

AU - Mohammad, Abdul Wahab

PY - 2016/10/20

Y1 - 2016/10/20

N2 - Abstract: Haematite (α-Fe2O3) nanoparticles (NPs) of different sizes and morphologies were prepared from two different iron precursors (iron acetate (A) and iron nitrate (N)) using the sol–gel technique, through a reaction with oxalic acid. A pure α-Fe2O3 phase (rhombohedral) that contained particles of different sizes and shapes were obtained from both iron precursors. Transmission electron microscope measurements showed average sizes of 23 ± 2 and 30 ± 2 nm for α-Fe2O3 (A) and α-Fe2O3 (N) formed NPs, respectively. The observed uniform spherical shape for the α-Fe2O3 (A) formed NPs is due to the presence of carboxylic acid (acetic acid) used to control the nucleation and growth process of α-Fe2O3 NPs. However, quasi-spherical particle shapes for α-Fe2O3 (N) were produced in the presence of a mineral acid (nitric acid), which caused the particles to be constrained during their growth step. However, the optical analysis showed that the band gaps of α-Fe2O3 (A) and α-Fe2O3 (N) as 2.63 and 2.60 eV were found, respectively. The surface area results exhibited that both α-Fe2O3 NPs were a porous material with a higher area for α-Fe2O3 (A), which resulted from the uniform shape and smaller size of particles. The magnetic properties were observed to be slightly different for both α-Fe2O3 NPs, which were also attributed to the different particle size of the NPs. Higher photocatalytic activity for congo red dye and 4-chlorophenol degradation under sunlight was achieved by α-Fe2O3 (A), which was attributed to the smaller size and higher surface area compared to α-Fe2O3 (N) NPs. Graphical Abstract: [Figure not available: see fulltext.]

AB - Abstract: Haematite (α-Fe2O3) nanoparticles (NPs) of different sizes and morphologies were prepared from two different iron precursors (iron acetate (A) and iron nitrate (N)) using the sol–gel technique, through a reaction with oxalic acid. A pure α-Fe2O3 phase (rhombohedral) that contained particles of different sizes and shapes were obtained from both iron precursors. Transmission electron microscope measurements showed average sizes of 23 ± 2 and 30 ± 2 nm for α-Fe2O3 (A) and α-Fe2O3 (N) formed NPs, respectively. The observed uniform spherical shape for the α-Fe2O3 (A) formed NPs is due to the presence of carboxylic acid (acetic acid) used to control the nucleation and growth process of α-Fe2O3 NPs. However, quasi-spherical particle shapes for α-Fe2O3 (N) were produced in the presence of a mineral acid (nitric acid), which caused the particles to be constrained during their growth step. However, the optical analysis showed that the band gaps of α-Fe2O3 (A) and α-Fe2O3 (N) as 2.63 and 2.60 eV were found, respectively. The surface area results exhibited that both α-Fe2O3 NPs were a porous material with a higher area for α-Fe2O3 (A), which resulted from the uniform shape and smaller size of particles. The magnetic properties were observed to be slightly different for both α-Fe2O3 NPs, which were also attributed to the different particle size of the NPs. Higher photocatalytic activity for congo red dye and 4-chlorophenol degradation under sunlight was achieved by α-Fe2O3 (A), which was attributed to the smaller size and higher surface area compared to α-Fe2O3 (N) NPs. Graphical Abstract: [Figure not available: see fulltext.]

KW - Nanoparticles

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KW - Sol–gel

KW - Sunlight

KW - α-FeO

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