A Piezo‐Fenton System with Rapid Iron Cycling and Hydrogen Peroxide Self‐Supply Driven by Ultrasound

• Published in: Chemistry : a European journal 2022-12, Vol.28 (71), p.e202202494-n/a
• Main Authors: Ge, Lin, Xiao, Jie, Liu, Wencheng, Ren, Guolan, Zhou, Chi, Liu, Junan, Zou, Ji‐Jun, Yang, Zixin
• Format: Article
• Language: English
• Subjects: antibacterial compounds; Carbon nitride; Catalysts; Catalytic activity; Chemistry; Conversion; Degradation; E coli; Free radicals; g-C3N4; Hydrogen peroxide; Hydrogen Peroxide - chemistry; Hydroxyl Radical; Hydroxyl radicals; Iron; Iron - chemistry; Leaching; Methylene blue; Oxidation; Oxidation-Reduction; Piezo-Fenton reactions; piezocatalysis; Rate constants; Sterilization; Systems design; Ultrasonic imaging; Ultrasonic processing; Ultrasound
• ISSN: 0947-6539; 1521-3765
• DOI: 10.1002/chem.202202494

The piezo‐Fenton system has attracted attention not only because it can enhance the Fenton reaction activity by mechanical energy input, but also because it is expected to realize a class of stimuli‐responsive advanced oxidation systems by regulating energy input and hydrogen peroxide self‐supply, thus greatly enriching the application possibilities of Fenton chemistry. In this work, a series of Fe‐doped g‐C3N4 (g‐C3N4‐Fe) as a piezo‐Fenton system were synthesized where the iron stably immobilized through Fe−N interaction. The piezo‐induced electrons generate on g‐C3N4 matrix support the conversion of Fe(III) to Fe(II) and promote rate‐limiting step of Fenton reaction. With the optimal Fe loading, g‐C3N4‐0.5Fe can achieve methylene blue (MB) degradation under ultrasonic treatment with first‐order kinetic rate constants of 75×10−3 min−1. Most importantly, the g‐C3N4‐Fe can maintain good catalytic activity in a wide pH range (pH=2.0∼9.0) and be cyclic used without iron leaching to solution (