Abstract
Abstract We investigated the adsorption and photocatalytic decomposition of methylene blue (MB) by colloidal suspensions of Rh-doped titanate nanosheets ([Ti4−xRhxO9]2−; Ti4NS:Rhx) prepared by exfoliating H2Ti4−xRhxO9 in aqueous tetramethylammonium hydroxide, revealing that doped nanosheets showed a slightly enhanced adsorption capacity compared to their non-doped counterparts. This behavior was ascribed to the elevated ionic charge of doped Ti4NS and the thus increased volume charge density. Accordingly, Ti4NS:Rhx exhibited a higher MB adsorption capacity than previously reported [Ti3−xRhxO7]2−. Moreover, we found that Ti4NS:Rhx catalyzed the photodegradation of MB under UV light irradiation, additionally showing that the activity of this catalyst can be improved by Rh doping, probably due to the large contribution of Rh3+/Rh4+ shuttling to effective MB degradation.
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