Exceptional degradation of organic pollutant through piezoelectric photocatalysis and peroxymonosulfate activation in the designed Bi ₄ O ₅ Br ₂ /BCZT S‐scheme heterojunction

Abstract Peroxymonosulfate (PMS) is commonly used in advanced oxidation processes to degrade organic pollutants in wastewater. In this work, to obtain better PMS activation efficiency, Bi 4 O 5 Br 2 /BCZT (BBT) piezoelectric photocatalyst was designed. Abundant active radicals produced by BBT under visible light irradiation and ultrasonic vibration were used to activate PMS, thereby achieving rapid degradation of high concentration pollutants. With the introduction of BCZT, the catalyst has a strong internal electric field and three‐dimensional lamellar structure, which promotes the separation and transfer of electrons and holes. It is worth noting that under optimal reaction conditions, the degradation rate of ARB reached 93% by BBT15 within 10 min. The catalytic experiment combined with the piezoelectric performance test results revealed the key role of piezoelectric photocatalytic reaction in PMS activation. This provides an important prospect for PMS to effectively deal with the degradation of high concentrations of organic pollutants.