Piezocatalytic investigation on 0.97(Na0.5Bi0.5)TiO3-0.03Ba(Ni0.5Nb0.5)O3-xLa for dye degradation from water

Abstract

This study explores piezocatalysis in 0.97(Na<inf>0.5</inf>Bi<inf>0.5</inf>)TiO<inf>3</inf>-0.03Ba(Ni<inf>0.5</inf>Nb<inf>0.5</inf>)O<inf>3</inf>-xLa, (NBT-BNN-xLa

x = 0, 0.25, 0.5, 0.75, 1 and 1.25 mol%) ceramic for Rhodamine B (RhB) dye degradation. The dye degradation improved from 47 % to ∼100 % (in 45 min) with La doping from 0 to 1 mol%. The increase in catalytic efficiency arises due to an increasing piezoelectric coefficient (d<inf>33</inf>) and decreasing relative permittivity (ε<inf>r</inf>), which increases the catalytic efficiency of dyes. The radical scavenger experiments validated the major role of superoxide (·O<inf>2</inf>–) and hydroxyl (·OH) radicals in the degradation process. The powder was also used to degrade methylene blue (MB) and methylene orange (MO) at 96 % and 88 % in 45 min. The repeatability test showed ∼100 % degradation of RhB, confirming piezocatalyst stability and reliability. The reusability test also shows good RhB dye degradation. The findings indicate that NBT-BNN-0.01La composition can be a potential piezocatalyst for dyes degradation in wastewater. © 2025 Elsevier B.V., All rights reserved.