Achieving efficient production and activation of H₂O₂ is a promising strategy to enhance the efficiency of heterogeneous Fenton reactions. For this purpose, an ideal heterogeneous Fenton platform was constructed though chemical embedding of carbon nanodots (CDots) onto the surface of iron oxychloride (FeOCl/CDots). Experimental results and theoretical calculations confirmed that CDots acted as the reactive sites for highly effective separation of photogenerated electrons and holes in the FeOCl substrate, whereby the O₂ molecules in solution could be synchronously reduced to H₂O₂ via a two-electron pathway (O₂ → •O₂H → H₂O₂) on the CDots. Under visible light irradiation, the concentration of H₂O₂ accumulated to ∼337.2 μmol L⁻¹ in the FeOCl/CDots system, which was almost ∼14 times higher than that using FeOCl alone. Moreover, the FeOCl substrate with abundant Fe²⁺ could directly capture and activate the H₂O₂ to produce abundant hydroxyl radical (•OH), thereby effectively avoiding the H₂O₂ mass transfer limitation encountered in traditional heterogeneous Fenton reactions. In experiments with a typical organic contaminant (p-chlorophenol), the oxidation rate and mineralization efficiency in this Fenton system were ∼4 and ∼6 times higher than that achieved using FeOCl alone.

实现H ₂ O _2的有效产生和活化是提高异质Fenton反应效率的有前途的策略。为此，通过将碳纳米点（CDots）化学嵌入氧氯化铁（FeOCl / CDots）的表面，构建了理想的异质Fenton平台。实验结果和理论计算证实，CDots可以作为高效分离FeOCl衬底中光生电子和空穴的反应位点，从而溶液中的O ₂分子可以通过双电子途径同步还原为H ₂ O ₂（ O ₂ →•O ₂ H→H ₂ O₂）在CDots上。在可见光照射下，FeOCl / CDots系统中的H ₂ O ₂浓度累积至约337.2μmolL ^-1，几乎是单独使用FeOCl时的约14倍。而且，具有丰富的Fe ²⁺的FeOCl底物可以直接捕获并激活H ₂ O ₂以产生丰富的羟基自由基（•OH），从而有效地避免了H ₂ O _{2的产生。}传统的非均质Fenton反应遇到传质限制。在典型的有机污染物（对氯苯酚）的实验中，该Fenton系统的氧化速率和矿化效率分别比单独使用FeOCl时高约4倍和约6倍。