Photoinduction is widely used to accelerate the Fe³⁺/Fe²⁺ circulation in Fe³⁺/H₂O₂ Fenton oxidation, however, the remained challenges in developing a facile, economical, and efficient synthetic methodology for the preparation of high-performance Fe-based Photo-Fenton catalyst and inevitably forming iron sludge limit its applications. Herein, starch-derived carbon (SC) encapsulated Fe₃O₄ (Fe₃O₄@SC) magnetic nanocomposites are synthesized by mechanical activation treatment combined with high-temperature pyrolysis method using cassava starch as the carbon source. The photoelectrochemical properties of Fe₃O₄@SC are regulated by COFe bonds and oxygen vacancies in Fe₃O₄@SC, as well as graphitization of SC, which effectively accelerate the Fe³⁺/Fe²⁺ circulation in Fe₃O₄@SC + H₂O₂ system under visible light, thus Fe₃O₄@SC shows excellent catalytic performance and superior stability for the degradation of tetracycline hydrochloride, and the initiation rate constant is 2.4 times higher than that in dark. Moreover, quenching experiments and electron spin resonance results confirm that OH, O₂⁻, and h⁺ (OH plays a critical role) are generated in the catalytic system of Fe₃O₄@SC + H₂O₂ + visible light. This work provides new insights into a green and facile approach for the synthesis of Photo-Fenton catalysts, providing new avenue for the acceleration of Fe³⁺/Fe²⁺ cycle under visible light-driven Fenton process.

光诱导被广泛用于加速Fe ³⁺ /H ₂ O ₂ Fenton氧化中的Fe 3+ /Fe 2+ 循环^，然而^，开发一种简便、经济、高效的合成方法来制备高性能的Fe 3+ /Fe 2+ 仍然面临挑战。铁基光芬顿催化剂和不可避免地形成的铁泥限制了其应用。本文以木薯淀粉为碳源，通过机械活化处理结合高温热解方法合成了淀粉源碳（ SC）包覆Fe ₃ O ₄（Fe ₃ O _{4 @SC）磁性纳米复合材料。}Fe的光电化学性质₃ O ₄ @SC受到Fe ₃ O ₄ @SC中C O Fe键和氧空位以及SC石墨化的调控，有效加速了Fe ₃ O ₄ @SC +中Fe ³⁺ /Fe ^{2+的循环Fe} ₃ O ₄ @SC在可见光下形成H ₂ O ₂体系，对盐酸四环素的降解表现出优异的催化性能和优异的稳定性，引发速率常数较暗下提高2.4倍。此外，猝灭实验和电子自旋共振结果证实，OH、O_{在Fe 3} O ₄ @SC + H ₂ O ₂  +可见光催化体系中生成₂ ^-和h ⁺（ OH起关键作用）。这项工作为合成光芬顿催化剂的绿色简便方法提供了新的见解，为可见光驱动芬顿过程下加速Fe ³⁺ /Fe ^{2+循环提供了新途径。}