Precursor morphology-controlled formation of perovskites CaTiO3 and their photo-activity for As(III) removal

- CaTiO3 with diverse morphologies are prepared by precursor controlled formation.
- CaTiO3 NPs are found to be a promising photocatalyst for As(III) removal.
- Holes (h+) are proposed to be the primary active species in As(III) oxidization.
- A band-gap model is proposed to explain the generation mechanism of active species.