A low-cost and highly efficient Fenton-like catalyst desired to produce the hydroxyl radical (^·OH) and sulfate radical (SO₄^·-) at the same time for environmental applications was successfully fabricated via a noval alcohol-thermal method. Remarkably, the Mn₃O₄/λ-MnO₂ composite exhibited the highly efficient activation for peroxymonosulfate (PMS) and deep mineralization for phenol under visible-light irradiation. The phenol degradation fitted the pseudo-first-order reaction kinetics well with rate constant of 0.0455 min⁻¹ for photo-Fenton-like system and 0.0340 min⁻¹ for Fenton-like system, respectively. Based on the results of radical quantification experiments and electron spin resonance (ESR) tests, ^·OH, SO₄^·- and superoxide radical (^·O₂^–) species played imperative roles during the oxidation process. The active species were mainly derived from the multivalent manganese ions on the surface of Mn₃O₄/λ-MnO₂ composite formed a cyclic loop and reacted with HSO₅^- of PMS, thus significantly enhancing the catalytic performance. Finally, the probable reaction mechanism of Mn₃O₄/λ-MnO₂ catalyst activation of PMS in a Fenton-like system under solar irradiation or in dark were speculated. This work will provide a new idea for the practical application of PMS activation in the treatment of organic matters in the wastewater under solar light irradiation.

通过一种新型醇热法成功制备了一种低成本、高效的类芬顿催化剂，可同时产生羟基自由基（ ^· OH）和硫酸根（SO ₄ ^{· - ），用于环境应用。}值得注意的是，Mn ₃ O ₄ / λ -MnO ₂复合材料在可见光照射下表现出对过氧单硫酸盐 (PMS) 的高效活化和对苯酚的深度矿化。苯酚降解符合伪一级反应动力学，光芬顿类系统的速率常数为 0.0455 min ^{-1 ，而 0.0340 min -1}分别用于类芬顿系统。基于自由基量化实验和电子自旋共振（ESR）测试的结果，^· OH、SO ₄ ^{· -}和超氧自由基（^· O ₂ ^-）物种在氧化过程中起着不可或缺的作用。_{活性物种主要来源于Mn 3} O ₄ / λ -MnO ₂复合材料表面的多价锰离子形成循环环与PMS的HSO ₅ ^-反应，从而显着提高催化性能。_{最后，Mn 3} O ₄的可能反应机理/ λ -MnO ₂催化剂在太阳辐射或黑暗条件下类芬顿体系中 PMS 的活化被推测。该工作将为PMS活化在太阳光照射下废水中有机物处理的实际应用提供新思路。