Piezo-promoted the generation of reactive oxygen species and the photodegradation of organic pollutants

• Published in: Applied catalysis. B, Environmental Environmental, 2019-12, Vol.258, p.118024, Article 118024
• Main Authors: Chen, Yao, Deng, Xiaoming, Wen, Jieya, Zhu, Jian, Bian, Zhenfeng
• Format: Article
• Language: English
• Subjects: Bonding strength; Catalysts; Electric fields; Electron transfer; Environmental degradation; FeTCPP/MoS2; Free radicals; Holes (electron deficiencies); Hydroxyl radicals; Iron; Molybdenum; Molybdenum disulfide; Performance degradation; Photocatalysis; Photodegradation; Photoexcitation; Piezoelectric effect; Piezoelectricity; Pollutants; Porphyrins; Purification; Reactive oxygen species; Recombination; Sulfide; Synergistic effect; Ultrasound
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2019.118024

[Display omitted] •The FeTCPP/MoS2 heterogeneous photocatalyst containing Fe-S bond was successfully prepared.•The Fe-S bond between FeTCPP and MoS2 facilitates electron transport and separation.•The FeTCPP/MoS2 can effectively increase free radicals under the excitation of ultrasound and visible light illumination. Composite of porphyrins and piezoelectric materials is a promising method to overcome the limitation of photocatalytic response of composite catalysts, inhibit photogenerated electron-hole recombination and enhance photocatalytic degradation performance. Here, the Fe-S electronic channel is formed by the combination of MoS2 and iron porphyrin, which enhances the electron transfer performance of iron porphyrin to MoS2 semiconductor. At the same time, two-dimensional MoS2 surface with piezoelectric properties forms an electric field, which further enhances charge separation and piezoelectric catalytic performance. The photoexcitation of porphyrin and the piezoelectric excitation of molybdenum sulfide cooperate with each other under the simultaneous action of light and ultrasound. Oxygen radicals and hydroxyl radicals are enhanced, and the catalytic degradation performance is further enhanced. By strengthening the interaction between porphyrins and piezoelectric materials, especially bonding, a good and stable catalyst for pollutant degradation and purification was prepared.