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

    11 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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    title = "Synthesis and characterization of Al2O3 nanoparticles by flame spray pyrolysis (FSP): Role of Fe ions in the precursor",
    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 -