Synthesis and characterization of Al2O3 nanoparticles by flame spray pyrolysis (FSP)

Role of Fe ions in the precursor

Laleh Divband Hafshejani, Sareh Tangsir, Hanna Koponen, Joakim Riikonen, Tommi Karhunen, Unto Tapper, Vesa-Pekka Lehto, Hadi Moazed, Abd Ali Naseri, Abdolrahim Hooshmand, Jorma Jokiniemi (Corresponding Author), Amit Bhatnagar (Corresponding Author), Anna Lähde (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)

Abstract

Iron doped aluminium oxide nanoparticles are of interest for number of applications (e.g. water treatment, catalytic conversion of exhaust gases) due to their high surface area, hardness, catalytic and magnetic properties. In the present study, flame spray pyrolysis (FSP) was employed for the synthesis of Fe/Al2O3 nanoparticles. Precursor solutions of aluminium acetylacetonate (0.2 mol·L-1) and ferrocene (0 to 0.2 mol·L-1) in toluene were used to synthesise pure and iron (Fe) doped Al2O3. The particle composition and morphology were studied and effect of iron concentration was analysed. It was found that in the absence of the iron precursor, FSP produced a mixture of two Al2O3 polymorphs: ?-Al2O3 and ?-Al2O3. The addition of ferrocene as an iron precursor was found to suppress formation of ?-Al2O3. At an iron molar concentration of 0.2 mol·L-1 mainly hercynite, FeAl2O4, was observed. Furthermore, increasing the iron concentration caused a linear shift of the X-ray diffraction peaks from positions corresponding to ?-Al2O3 to those of FeAl2O4. This indicates the formation of a solid solution (FexAl2O3 + x) at intermediated concentrations. It was also found that the primary particle size, which was below 10 nm, did not significantly change with the increased iron concentration and was comparable to the mean crystallite size indicating that size of these single crystalline primaries is determined by the synthesis process rather than the chemistry of the product. However, the hydrodynamic size was around 180 nm indicating that the particles are agglomerates in the water suspension. Additionally, zeta potential of the nanoparticles was found to decrease slightly with increasing iron content, though in all cases it was above 50 mV. Finally, the potential of synthesized nanoparticles was examined for the removal of fluoride because fluoride causes harmful health effects to human health at elevated concentrations. The results of fluoride removal using synthesized nanoparticles produced in this study showed that the highest fluoride removal efficiency was observed for the sample having no iron content.
Original languageEnglish
Pages (from-to)42-49
JournalPowder Technology
Volume298
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

Fingerprint

Spray pyrolysis
Iron
Ions
Nanoparticles
Fluorides
Health
Aluminum
Aluminum Oxide
Toluene
Zeta potential
Crystallite size
Exhaust gases
Polymorphism
Water treatment
Solid solutions
Magnetic properties
Suspensions
Hydrodynamics
Hardness
Particle size

Keywords

  • FeAl2O4
  • Flame spray pyrolysis (FSP)
  • Fluoride removal
  • Lattice parameter

Cite this

Hafshejani, Laleh Divband ; Tangsir, Sareh ; Koponen, Hanna ; Riikonen, Joakim ; Karhunen, Tommi ; Tapper, Unto ; Lehto, Vesa-Pekka ; Moazed, Hadi ; Naseri, Abd Ali ; Hooshmand, Abdolrahim ; Jokiniemi, Jorma ; Bhatnagar, Amit ; Lähde, Anna. / Synthesis and characterization of Al2O3 nanoparticles by flame spray pyrolysis (FSP) : Role of Fe ions in the precursor. In: Powder Technology. 2016 ; Vol. 298. pp. 42-49.
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abstract = "Iron doped aluminium oxide nanoparticles are of interest for number of applications (e.g. water treatment, catalytic conversion of exhaust gases) due to their high surface area, hardness, catalytic and magnetic properties. In the present study, flame spray pyrolysis (FSP) was employed for the synthesis of Fe/Al2O3 nanoparticles. Precursor solutions of aluminium acetylacetonate (0.2 mol·L-1) and ferrocene (0 to 0.2 mol·L-1) in toluene were used to synthesise pure and iron (Fe) doped Al2O3. The particle composition and morphology were studied and effect of iron concentration was analysed. It was found that in the absence of the iron precursor, FSP produced a mixture of two Al2O3 polymorphs: ?-Al2O3 and ?-Al2O3. The addition of ferrocene as an iron precursor was found to suppress formation of ?-Al2O3. At an iron molar concentration of 0.2 mol·L-1 mainly hercynite, FeAl2O4, was observed. Furthermore, increasing the iron concentration caused a linear shift of the X-ray diffraction peaks from positions corresponding to ?-Al2O3 to those of FeAl2O4. This indicates the formation of a solid solution (FexAl2O3 + x) at intermediated concentrations. It was also found that the primary particle size, which was below 10 nm, did not significantly change with the increased iron concentration and was comparable to the mean crystallite size indicating that size of these single crystalline primaries is determined by the synthesis process rather than the chemistry of the product. However, the hydrodynamic size was around 180 nm indicating that the particles are agglomerates in the water suspension. Additionally, zeta potential of the nanoparticles was found to decrease slightly with increasing iron content, though in all cases it was above 50 mV. Finally, the potential of synthesized nanoparticles was examined for the removal of fluoride because fluoride causes harmful health effects to human health at elevated concentrations. The results of fluoride removal using synthesized nanoparticles produced in this study showed that the highest fluoride removal efficiency was observed for the sample having no iron content.",
keywords = "FeAl2O4, Flame spray pyrolysis (FSP), Fluoride removal, Lattice parameter",
author = "Hafshejani, {Laleh Divband} and Sareh Tangsir and Hanna Koponen and Joakim Riikonen and Tommi Karhunen and Unto Tapper and Vesa-Pekka Lehto and Hadi Moazed and Naseri, {Abd Ali} and Abdolrahim Hooshmand and Jorma Jokiniemi and Amit Bhatnagar and Anna L{\"a}hde",
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Hafshejani, LD, Tangsir, S, Koponen, H, Riikonen, J, Karhunen, T, Tapper, U, Lehto, V-P, Moazed, H, Naseri, AA, Hooshmand, A, Jokiniemi, J, Bhatnagar, A & Lähde, A 2016, 'Synthesis and characterization of Al2O3 nanoparticles by flame spray pyrolysis (FSP): Role of Fe ions in the precursor', Powder Technology, vol. 298, pp. 42-49. https://doi.org/10.1016/j.powtec.2016.05.003

Synthesis and characterization of Al2O3 nanoparticles by flame spray pyrolysis (FSP) : Role of Fe ions in the precursor. / Hafshejani, Laleh Divband; Tangsir, Sareh; Koponen, Hanna; Riikonen, Joakim; Karhunen, Tommi; Tapper, Unto; Lehto, Vesa-Pekka; Moazed, Hadi; Naseri, Abd Ali; Hooshmand, Abdolrahim; Jokiniemi, Jorma (Corresponding Author); Bhatnagar, Amit (Corresponding Author); Lähde, Anna (Corresponding Author).

In: Powder Technology, Vol. 298, 2016, p. 42-49.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Synthesis and characterization of Al2O3 nanoparticles by flame spray pyrolysis (FSP)

T2 - Role of Fe ions in the precursor

AU - Hafshejani, Laleh Divband

AU - Tangsir, Sareh

AU - Koponen, Hanna

AU - Riikonen, Joakim

AU - Karhunen, Tommi

AU - Tapper, Unto

AU - Lehto, Vesa-Pekka

AU - Moazed, Hadi

AU - Naseri, Abd Ali

AU - Hooshmand, Abdolrahim

AU - Jokiniemi, Jorma

AU - Bhatnagar, Amit

AU - Lähde, Anna

PY - 2016

Y1 - 2016

N2 - Iron doped aluminium oxide nanoparticles are of interest for number of applications (e.g. water treatment, catalytic conversion of exhaust gases) due to their high surface area, hardness, catalytic and magnetic properties. In the present study, flame spray pyrolysis (FSP) was employed for the synthesis of Fe/Al2O3 nanoparticles. Precursor solutions of aluminium acetylacetonate (0.2 mol·L-1) and ferrocene (0 to 0.2 mol·L-1) in toluene were used to synthesise pure and iron (Fe) doped Al2O3. The particle composition and morphology were studied and effect of iron concentration was analysed. It was found that in the absence of the iron precursor, FSP produced a mixture of two Al2O3 polymorphs: ?-Al2O3 and ?-Al2O3. The addition of ferrocene as an iron precursor was found to suppress formation of ?-Al2O3. At an iron molar concentration of 0.2 mol·L-1 mainly hercynite, FeAl2O4, was observed. Furthermore, increasing the iron concentration caused a linear shift of the X-ray diffraction peaks from positions corresponding to ?-Al2O3 to those of FeAl2O4. This indicates the formation of a solid solution (FexAl2O3 + x) at intermediated concentrations. It was also found that the primary particle size, which was below 10 nm, did not significantly change with the increased iron concentration and was comparable to the mean crystallite size indicating that size of these single crystalline primaries is determined by the synthesis process rather than the chemistry of the product. However, the hydrodynamic size was around 180 nm indicating that the particles are agglomerates in the water suspension. Additionally, zeta potential of the nanoparticles was found to decrease slightly with increasing iron content, though in all cases it was above 50 mV. Finally, the potential of synthesized nanoparticles was examined for the removal of fluoride because fluoride causes harmful health effects to human health at elevated concentrations. The results of fluoride removal using synthesized nanoparticles produced in this study showed that the highest fluoride removal efficiency was observed for the sample having no iron content.

AB - Iron doped aluminium oxide nanoparticles are of interest for number of applications (e.g. water treatment, catalytic conversion of exhaust gases) due to their high surface area, hardness, catalytic and magnetic properties. In the present study, flame spray pyrolysis (FSP) was employed for the synthesis of Fe/Al2O3 nanoparticles. Precursor solutions of aluminium acetylacetonate (0.2 mol·L-1) and ferrocene (0 to 0.2 mol·L-1) in toluene were used to synthesise pure and iron (Fe) doped Al2O3. The particle composition and morphology were studied and effect of iron concentration was analysed. It was found that in the absence of the iron precursor, FSP produced a mixture of two Al2O3 polymorphs: ?-Al2O3 and ?-Al2O3. The addition of ferrocene as an iron precursor was found to suppress formation of ?-Al2O3. At an iron molar concentration of 0.2 mol·L-1 mainly hercynite, FeAl2O4, was observed. Furthermore, increasing the iron concentration caused a linear shift of the X-ray diffraction peaks from positions corresponding to ?-Al2O3 to those of FeAl2O4. This indicates the formation of a solid solution (FexAl2O3 + x) at intermediated concentrations. It was also found that the primary particle size, which was below 10 nm, did not significantly change with the increased iron concentration and was comparable to the mean crystallite size indicating that size of these single crystalline primaries is determined by the synthesis process rather than the chemistry of the product. However, the hydrodynamic size was around 180 nm indicating that the particles are agglomerates in the water suspension. Additionally, zeta potential of the nanoparticles was found to decrease slightly with increasing iron content, though in all cases it was above 50 mV. Finally, the potential of synthesized nanoparticles was examined for the removal of fluoride because fluoride causes harmful health effects to human health at elevated concentrations. The results of fluoride removal using synthesized nanoparticles produced in this study showed that the highest fluoride removal efficiency was observed for the sample having no iron content.

KW - FeAl2O4

KW - Flame spray pyrolysis (FSP)

KW - Fluoride removal

KW - Lattice parameter

U2 - 10.1016/j.powtec.2016.05.003

DO - 10.1016/j.powtec.2016.05.003

M3 - Article

VL - 298

SP - 42

EP - 49

JO - Powder Technology

JF - Powder Technology

SN - 0032-5910

ER -