Hydrothermal Synthesis of Bi‐Doped WO 3 ⋅0.5H 2 O Material with Tetragonal Pyramid‐Like Structure and Its Enhanced Photocatalytic Activity

A novel Bi‐doped WO 3 ⋅0.5H 2 O nanomaterial with a tetragonal pyramid‐like structure was synthesized for the first time by a convenient and green hydrothermal method. The Bi‐doped WO 3 ⋅0.5H 2 O material were successfully obtained and confirmed by XRD, XPS and EDX. Bi‐doped tetragonal pyramid‐like WO 3 ⋅0.5H 2 O material exhibits excellent photocatalytic performance. The 1 mol% of Bi‐doped WO 3 ⋅0.5H 2 O exhibits optimal degradation efficiency for MO, reaching 99.5% after 75 min. The enhancement of photocatalytic activity could be attributed to the doping of Bi. This is because the doping of Bi affects the morphology of WO 3 ⋅0.5H 2 O, improves the crystallinity of the material, expands the light absorption range of the material and causes a slightly increase in oxygen vacancies and carrier density. In addition, the material exhibits excellent reusability under light irradiation. This study not only provides a simple strategy for constructing new metal ion doped composite materials, but also enhances the application potential of WO 3 ‐based photocatalytic materials in the decomposition of harmful organic dyes in wastewater.