Green synthesis of mesoporous hematite (α-Fe2O 3) nanoparticles and their photocatalytic activity

Bashir Ahmmad; Kwati Leonard; Md Shariful Islam; Junichi Kurawaki; Manickavachagam Muruganandham; Takahiro Ohkubo; Yasushige Kuroda

doi:10.1016/j.apt.2012.04.005

Green synthesis of mesoporous hematite (α-Fe₂O ₃) nanoparticles and their photocatalytic activity

Bashir Ahmmad, Kwati Leonard, Md Shariful Islam, Junichi Kurawaki, Manickavachagam Muruganandham, Takahiro Ohkubo, Yasushige Kuroda

Research output: Contribution to journal › Article › peer-review

233 Citations (Scopus)

Abstract

A green synthesis method for the preparation of mesoporous α-Fe ₂O₃ nanoparticles has been developed using the extract of green tea (camellia sinensis) leaves. This simple and one-step method can suitably be scaled up for large-scale synthesis. The as-prepared mesoporous nanoparticles were characterized by SEM, TEM, XRD, XPS, Raman, UV-visible spectroscopy and N₂ adsorption analysis. The nanoparticles were highly pure and well crystallized with an average particle size of 60 nm. The photocatalytic activity of nanoparticles was evaluated by the amount of hydroxyl radical formation under visible light irradiation detected by fluorescence spectroscopy. The as-prepared α-Fe₂O₃ showed two times higher activity than commercial α-Fe₂O₃ in term of hydroxyl radical formation and enhanced performance in a photoelectrochemical cell. Also, a plausible mechanism for the formation of mesoporous α-Fe₂O₃ has been suggested.

Original language	English
Pages (from-to)	160-167
Number of pages	8
Journal	Advanced Powder Technology
Volume	24
Issue number	1
DOIs	https://doi.org/10.1016/j.apt.2012.04.005
Publication status	Published - Jan 2013

Keywords

Biosynthesis
Green tea
Hydroxyl radical
Iron oxide
Solar cell

ASJC Scopus subject areas

Chemical Engineering(all)
Mechanics of Materials

Access to Document

10.1016/j.apt.2012.04.005

Cite this

@article{217243d599974e80b9d614efb61439d3,

title = "Green synthesis of mesoporous hematite (α-Fe2O 3) nanoparticles and their photocatalytic activity",

abstract = "A green synthesis method for the preparation of mesoporous α-Fe 2O3 nanoparticles has been developed using the extract of green tea (camellia sinensis) leaves. This simple and one-step method can suitably be scaled up for large-scale synthesis. The as-prepared mesoporous nanoparticles were characterized by SEM, TEM, XRD, XPS, Raman, UV-visible spectroscopy and N2 adsorption analysis. The nanoparticles were highly pure and well crystallized with an average particle size of 60 nm. The photocatalytic activity of nanoparticles was evaluated by the amount of hydroxyl radical formation under visible light irradiation detected by fluorescence spectroscopy. The as-prepared α-Fe2O3 showed two times higher activity than commercial α-Fe2O3 in term of hydroxyl radical formation and enhanced performance in a photoelectrochemical cell. Also, a plausible mechanism for the formation of mesoporous α-Fe2O3 has been suggested.",

keywords = "Biosynthesis, Green tea, Hydroxyl radical, Iron oxide, Solar cell",

author = "Bashir Ahmmad and Kwati Leonard and {Shariful Islam}, Md and Junichi Kurawaki and Manickavachagam Muruganandham and Takahiro Ohkubo and Yasushige Kuroda",

note = "Funding Information: This work was partly supported by Grant-in-Aid for Scientific Research (No. 21020030). One of the authors (B.A.) acknowledges the financial support by the Sasakawa Scientific Research Grant from the Japan Science Society. The authors also wish to thank Mr. Masao Arima of Kagoshima prefecture for providing fresh green tea leaves and Ms. Mika Arima for helping to prepare the green tea extract. ",

year = "2013",

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AU - Leonard, Kwati

AU - Shariful Islam, Md

AU - Kurawaki, Junichi

AU - Muruganandham, Manickavachagam

AU - Ohkubo, Takahiro

AU - Kuroda, Yasushige

N1 - Funding Information: This work was partly supported by Grant-in-Aid for Scientific Research (No. 21020030). One of the authors (B.A.) acknowledges the financial support by the Sasakawa Scientific Research Grant from the Japan Science Society. The authors also wish to thank Mr. Masao Arima of Kagoshima prefecture for providing fresh green tea leaves and Ms. Mika Arima for helping to prepare the green tea extract.

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N2 - A green synthesis method for the preparation of mesoporous α-Fe 2O3 nanoparticles has been developed using the extract of green tea (camellia sinensis) leaves. This simple and one-step method can suitably be scaled up for large-scale synthesis. The as-prepared mesoporous nanoparticles were characterized by SEM, TEM, XRD, XPS, Raman, UV-visible spectroscopy and N2 adsorption analysis. The nanoparticles were highly pure and well crystallized with an average particle size of 60 nm. The photocatalytic activity of nanoparticles was evaluated by the amount of hydroxyl radical formation under visible light irradiation detected by fluorescence spectroscopy. The as-prepared α-Fe2O3 showed two times higher activity than commercial α-Fe2O3 in term of hydroxyl radical formation and enhanced performance in a photoelectrochemical cell. Also, a plausible mechanism for the formation of mesoporous α-Fe2O3 has been suggested.

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