Abstract
Abstract Core-shell type Fe 3 O 4 @Fe 2 O 3 was dispersed over nano Al 2 O 3 support using aqueous medium co-precipitation method. The Fe 3 O 4 core offers magnetic recoverability, while the shell Fe 2 O 3 , due to its optimal band gap, provides photocatalytic activity in the visible light region. The concentration of Fe 3 O 4 @Fe 2 O 3 was varied and the synthesized materials were characterized using XRD, TEM, XPS, Raman spectroscopy, diffuse reflectance spectroscopy and BET surface area measurement. The synthesized materials were studied for Cr(VI) visible light photoreduction. Oxalic acid was used as a hole scavenger and Cr(VI) was efficiently reduced under visible light in aerobic condition. Even with 5% Fe 3 O 4 @Fe 2 O 3 /Al 2 O 3 the rate of photoreduction was orders of magnitude higher than that of bulk Fe 3 O 4 @Fe 2 O 3 . The obtained rates with the synthesized catalysts were compared with the literature and were found to be superior to the reported catalysts. The 40% Fe 3 O 4 @Fe 2 O 3 /Al 2 O 3 catalyst showed magnetic recoverability and the catalytic efficiency was stable up to 4 cycles.
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