Why is Cr2O3 not active as a photocatalyst?

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Yurii V Geletii

You do not need to cite why something is not active, you must cite if something IS ACTIVE.

Mohamed S. Hamdy

Hi Yurii, it is not only about citation, there are many reference reported the inactivity of Cr2O3 (including 2 of myself), but not a single paper gave a reason for that?

It might be thousands reasons why it is not active. If something active, this is an exception and you have to explain why. Is there anything very similar to Cr2O3, but active? If so you have to explain. Otherwise not. You may spend years to find the answer why something is not active and it will be waste of time. This is my personal opinion. I have found this paper, which might be interesting for you

Synthesis and photocatalytic behaviors of Cr2O3-CNT/TiO2 composite materials under visible light

By Chen, Ming Liang; Cho, Kwang Youn; Oh, Won Chun

From Journal of Materials Science (2010), 45(24), 6611-6616. | Language: English, D

Cr2O3-CNT/TiO2 composites derived from chromium acetylacetonate, multi-walled carbon nanotubes (MWCNT) and titanium n-butoxide (TNB) were prepd., and the photocatalytic activity of the Cr2O3-CNT and CNT/TiO2 composites was examd. The Cr2O3-CNT/TiO2 composites were characterized by BET surface area measurement, X-ray diffraction, TEM, and energy dispersive X-ray anal. The photocatalytic activity was detd. from the decompn. of methylene blue (MB) under visible light irradn. Methylene blue was photodegraded successfully in the presence of the Cr2O3-CNT/TiO2 composite under visible light irradn.

Nguyen LE PHUC

I agree with Yurii V Geletii. By the way, Cr2O3 can have a thousand different types, depends on the preparation method. So, the properties of material could be determined not only by its composition but also its morphology and structure.

BR,

Xianguang Meng

A good semiconductor photocatalyst must has a d10 or d0 electronic figuration. Please refer to the review article published in Chemical Society Review(by prof. Kudo). Cr2O3 is not good because the d orbital of Cr3+ is semi-filled, but Cr3+ is a good dopant to sensitized wide band gap semiconductors into visible light.