Electrochemical Synthesis of Nanocrystalline Bi_(12)Ti0_(20) Powders and their Photocatalytic Ability under Visible Light

摘要

Nanocrystalline Bi_(12)TiO_(20) powders were successfully synthesized using an electrochemical method, where Bi and Ti plates were used as the anode and the cathode. Their crystallization and dispersion strongly rely on the H_3PO_4 amount in the electrolytic solution. Only large-sized Bi_(12)Ti0_(20) microspheres can be obtained without H_3PO_4, while adding H_3PO_4 in an electrolytic solution will destroy the dense microspheres and weaken the adhesion among primary particles, forming well-dispersed nanocrystalline Bi_(12)TiO_(20). XRD and HRTEM evidenced the coexistence of body-centered cubic phase Bi_(12)TiO_(20) with the face-centered cubic phase in nanocrystalline samples, and ultraviolet-Vis absorption and photodegradation data verified their good response to visible light and excellent photocatalytic ability.