 Orthorhombic molybdenum trioxide, alpha MOO3, has been found to be an effective inhibitor of photocatalysis by other materials, including titanium dioxide, TiO2, silver bromide, AgBr, zinc oxide, zeno, bismuth oxiodide, BioI, and copper, 2, oxide, Cu2O. This inhibitory effect was observed when these materials were used together with alpha MOO3 in the photodegradation of methyl orange and phenol under ultraviolet A, UVA, and visible light irradiation. The presence of alpha MOO3 significantly reduced the photocatalytic activity of all five materials, but it did not affect the activity of AgBr. This suggests that alpha MOO3 may be an effective and stable inhibitor for evaluating new photocatalysts. Additionally, the lack of inhibition of photocatalytic activity by alpha MOO3 indicates that parallel reactions are taking place alongside the photocatalytic process. This article was authored by Andrew Jolt-Kheves in Nicobardos, Alper Ravis, and others. We are article.tv. Links in the description below.