ISSN 2630-0583 (Print)
ISSN 2630-0656 (Online)
Journal of Current Science and Technology
Rangsit Journal of Arts and Sciences. Vol.4 No.1 , January - June 2014.
Biosynthesis of elliptical hematite microparticles and their photocatalytic performance
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.