Monoclinic scheelite-type BiVO
4 is currently considered as one of the most promising non-titania photocatalysts, wheras tetragonal zircon-type BiVO
4 is still poorly understood. Herein, a new and simple synthetic approach was applied and nanostructured single-phase zircon-type BiVO
4 was successfully prepared by a controllable ethylene-glycol colloidal route. In addition, nanostructured monoclinic scheelite-type BiVO
4 powders were also fabricated through annealing of the as-prepared samples. A comparative study of the two BiVO
4 polymorphs was conducted and it turned out that the novel synthetic approach had a significant impact on porosity and photocatalytic performance of zircon-structured BiVO
4. All the prepared materials, as-prepared and annealed, were mesoporous, while measured values of specific surface area of some zircon-structured samples (~34?m
2/g) were ~7 times higher than those reported thus far for this phase. Interestingly, for the first time, zircon-type BiVO
4, previously considered to be a poor photocatalyst, exhibited a better overall performance in degradation of methyl orange compared to monoclinic scheelite-type BiVO
4. Hence, it could be expected that the here-presented synthesis and observations will both arouse interest in scarcely studied tetragonal zircon-type BiVO
4 and facilitate as well as speed up further research of its properties.
相似文献