High Performance Piezocatalytic H2o2 Production Under Magnetic Stirring and In-Situ Utilization in a Cascade Reaction for Pollutant Degradation

Piezocatalytic H2O2 production was severely restricted by the slow production rate. To increase the yield, high-energy and noisy ultrasound was commonly employed as the mechanical force. In this work, O-atoms doped MoS2 was prepared in a low-temperature hydrothermal reaction (MoS2-xOx-T). Piezocatalytic property was largely improved via destroying symmetry structure by doped O-atoms. H2O2 yield over MoS2-xOx-180 was 3.1 mM/g/h at 600 rpm and even comparable to reported piezocatalysts under ultrasound. Mechanism study revealed that one-step two-electron O2 reduction reaction was responsible for H2O2 generation. Considering the difficult purification process and self-decomposition characteristics of H2O2, a cascade reaction was designed by combining piezocatalytic reaction with Fenton reaction, where H2O2 was in-situ activated to be •OH for pollutant degradation. 91.5% of rhodamine B was degraded within 10 min. This work provides a new method for piezocatalytic H2O2 production with exceptional performance, that can be directly applied to the environmental remediation field.