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Nanoparticles of noble metals, such as silver and gold, have been investigated as one way to hinder the recombination of electrons and holes produced by irradiated semiconductors. However, the exact role silver plays in hindering electron–hole recombination is unclear. In order to assess the role of ionic silver, Ag⁺, and metallic silver, Ag⁰, on the potential photocatalytic activity of a titanosilicate ETS-10 semiconductor (i.e., a means to extend light absorption into the visible range, a means to form a Schottky barrier to hinder electron–hole recombination, as a catalyst for the production of oxygen radicals, as a means to capture electron through species reduction, etc.) the photosensitization of methylene blue (MB) was investigated under visible light irradiation. Visible light irradiation was chosen so as to decouple the effects silver nanoparticles play in this photosensitized reaction from the complexities of electron …