ISSN 2630-0583 (Print)

ISSN 2630-0656 (Online)

JCST

Journal of Current Science and Technology

http://jcst.rsu.ac.th

Rangsit Journal of Arts and Sciences. Vol.4 No.1 , January - June 2014.

Biosynthesis of elliptical hematite microparticles and their photocatalytic performance

Bashir Ahmmad, Kensaku Kanomata, Fumihiko Hirose, Junichi Kurawaki, and Takahiro Ohkubo

Abstract

          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.

Keywords: iron oxide, hydroxyl radical, green tea, green synthesis.

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