_{Spontaneous generation of H2O2 and activation in heterogeneous Fenton is a promising technology for waste-water treatment. Here organic carbon modified Fe3O4/schwertmannite (Fe3O4/Sch/OC) by introducing Fe3O4 in the Acidithiobacillus ferrooxidans-driven Fe2+ oxidation process to give catalysts. In-situ H2O2 could be generated via Fe3O4/Sch/OC-driven oxygen reduction reaction (ORR), moreover, the in-situ H2O2 was disintegrated to produce •OH in Fe3O4/Sch/OC-driven Fenton reaction to degrade the methylene blue (MB). The catalysts were characterized by XRD, SEM, BET and XPS spectroscopy. Oxygen-containing functional groups (e.g., C=O, -COOH, -OH) on Fe3O4/Sch/OC surface could provide more active sites for the adsorption and reduction of O2. The carbon-modification promoted both the selectivity of 2e- ORR and Fe2+ content of catalyst. Thus, Fe3O4/Sch/OC exhibited a higher H2O2 selectivity (∼65%) and MB degradation efficiency (∼81%) than Sch, Fe3O4, or Fe3O4/Sch. In addition, in-situ H2O2 could be produced at a wide initial pH range (3 - 9). The degradation pathways of MB were also proposed based on theoretically calculated and LC-MS data. The finding opens up a new way for developing a cost-effective Sch-based catalyst for producing in-situ H2O2 and degrading pollutants.}

_{在非均质 Fenton 中自发产生 H2O2 和活化是一种很有前途的废水处理技术。这里通过在 氧化亚铁硫杆菌中引入 Fe3O4 有机碳改性 Fe3O4/施维特曼石 (Fe3O4/Sch/OC)驱动的 Fe2+ 氧化过程得到催化剂。Fe3O4/Sch/OC 驱动的氧还原反应 (ORR) 可以原位生成 H2O2，此外，在 Fe3O4/Sch/OC 驱动的 Fenton 反应中原位 H2O2 分解生成•OH 降解亚甲蓝(MB)。通过XRD、SEM、BET和XPS光谱对催化剂进行表征。Fe3O4/Sch/OC 表面的含氧官能团（如C=O、-COOH、-OH）可以为O2 的吸附和还原提供更多的活性位点。碳改性促进了 2e-ORR 的选择性和催化剂的 Fe2+ 含量。因此，Fe3O4/Sch/OC 表现出比 Sch、Fe3O4 或 Fe3O4/Sch 更高的 H2O2 选择性（~65%）和 MB 降解效率（~81%）。此外，可以在较宽的初始 pH 值范围 (3 - 9) 下生产原位 H2O2。还基于理论计算和 LC-MS 数据提出了 MB 的降解途径。这一发现为开发具有成本效益的基于 Sch 的催化剂用于原位生产 H2O2 和降解污染物开辟了一条新途径。}