Biosynthesis of elliptical hematite microparticles and their photocatalytic performance


  • Bashir Ahmmad Graduate School of Science and Engineering, Yamagata University, Yonezawa 992-8510, Japan
  • Kensaku Kanomata Graduate School of Science and Engineering, Yamagata University, Yonezawa 992-8510, Japan
  • Fumihiko Hirose Graduate School of Science and Engineering, Yamagata University, Yonezawa 992-8510, Japan
  • Junichi Kurawaki Department of Chemistry & Bioscience, Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890-0065, Japan
  • Takahiro Ohkubo Department of Chemistry, Graduate School of Science and Technology, Okayama University, Okayama 700-8530, Japan


iron oxide, hydroxyl radical, green tea, green synthesis


A green synthesis method of a-Fe2O3 microparticles has been developed using the extract of green tea (camellia sinensis) leaves. The as-prepared microparticles were characterized by SEM, TEM, XRD, XPS, UV-visible spectroscopy, and N2 adsorption analysis. The crystallized microparticles were elliptical in shape with a diameter and length of 1mm and 2 mm, respectively. The photocatalytic activity of the microparticles was evaluated by the amount of hydroxyl radical formation under visible light irradiation detected by fluorescence spectroscopy. The as-prepared a-Fe2O3 showed similar photocatalytic activity as the commercial a-Fe2O3 in terms of hydroxyl radical formation. The microparticles were easy to separate from the aqueous suspension by gravity settling after water treatment. A plausible mechanism for the formation of a-Fe2O3 microparticles was suggested.


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How to Cite

Bashir Ahmmad, Kensaku Kanomata, Fumihiko Hirose, Junichi Kurawaki, & Takahiro Ohkubo. (2023). Biosynthesis of elliptical hematite microparticles and their photocatalytic performance. Journal of Current Science and Technology, 4(1), 31–38. Retrieved from



Research Article