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In this work, a series of Fe\u2010doped g\u2010C<jats:sub>3<\/jats:sub>N<jats:sub>4<\/jats:sub> (g\u2010C<jats:sub>3<\/jats:sub>N<jats:sub>4<\/jats:sub>\u2010Fe) as a piezo\u2010Fenton system were synthesized where the iron stably immobilized through Fe\u2212N interaction. The piezo\u2010induced electrons generate on g\u2010C<jats:sub>3<\/jats:sub>N<jats:sub>4<\/jats:sub> matrix support the conversion of Fe(III) to Fe(II) and promote rate\u2010limiting step of Fenton reaction. With the optimal Fe loading, g\u2010C<jats:sub>3<\/jats:sub>N<jats:sub>4<\/jats:sub>\u20100.5Fe can achieve methylene blue (MB) degradation under ultrasonic treatment with first\u2010order kinetic rate constants of 75\u00d710<jats:sup>\u22123<\/jats:sup>\u2005min<jats:sup>\u22121<\/jats:sup>. Most importantly, the g\u2010C<jats:sub>3<\/jats:sub>N<jats:sub>4<\/jats:sub>\u2010Fe can maintain good catalytic activity in a wide pH range (pH=2.0\u223c9.0) and be cyclic used without iron leaching to solution (&lt;0.001\u2005\u03bcg\u2009\u22c5\u2009L<jats:sup>\u22121<\/jats:sup>), overcoming the disadvantage of traditional Fe\u2010based Fenton catalysts that can only be applied under acidic conditions and prone to secondary pollution. In addition, g\u2010C<jats:sub>3<\/jats:sub>N<jats:sub>4<\/jats:sub>\u20100.5Fe also exhibits antibacterial properties of <jats:italic>Escherichia coli<\/jats:italic> and <jats:italic>Staphylococcus aureus<\/jats:italic> under ultrasound. Hydroxyl radicals mainly contribute to the degradation of MB and the sterilization process. Our work is an attempt to clarify the role of g\u2010C<jats:sub>3<\/jats:sub>N<jats:sub>4<\/jats:sub>\u2010Fe in the conversion of mechanical energy to ROS and provide inspirations for the piezo\u2010Fenton system design.<\/jats:p>","DOI":"10.1002\/chem.202202494","type":"journal-article","created":{"date-parts":[[2022,9,14]],"date-time":"2022-09-14T11:14:05Z","timestamp":1663154045000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["A Piezo\u2010Fenton System with Rapid Iron Cycling and Hydrogen Peroxide Self\u2010Supply Driven by Ultrasound"],"prefix":"10.1002","volume":"28","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2300-6881","authenticated-orcid":false,"given":"Lin","family":"Ge","sequence":"first","affiliation":[{"name":"College of Science Huazhong Agricultural University  430070 Wuhan P.\u2005R. 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