Deactivation and Regeneration of NaTaO₃ Photocatalyst in Cooperating Dehydrogenation Coupling of Isopropanol and Hydrogenation Coupling of Acetone Reaction System

Abstract

Photocatalyst activity is influenced by many factors, such as adsorption of by-products, runoff of surface hydroxyl groups and carriers. In this study, a simple and efficient photocatalyst regeneration method was developed. Results indicated that NaTaO photocatalyst lost its photoactivity after three cycles of reaction that involves coupling of isopropanol and hydrogenation coupling of acetone reaction system. Runoff of Na on the surface was the main reason for the deactivation of NaTaO photocatalyst. After hydrothermal treatment of the deactivated NaTaO with 10 m NaOH at 180°C for 12 h, its photocatalytic activity was restored to the original level. The photocatalytic activity remained stable even after 10 cycles.

Advances in Z‐scheme semiconductor photocatalysts for the photoelectrochemical applications: A review

“…Furthermore, it is possible to combine properties, such as ferroelectricity or piezoelectricity, with the photocatalytic effect to improve photocatalytic activity. The perovskite photocatalysts can be classified into the following categories: titanates, SrTiO 3 112–118 and BaTiO 3 119–123 ; tantalates, LiTaO 3 , 124 NaTaO 3 125–132 and KTaO 3 133–137 ; niobates, LiNbO 3 , 138,139 NaNbO 3 140–147 and KNbO 3 148–153 ; vanadates, AgVO 3 154–162 ; and ferrites, LaFeO 3 , 164–169 BiFeO 3 170–176 and GaFeO 3 177 . These compounds show great potential for application in visible light‐driven photoreactions.…”