Zhang Xiai, Zhang Wenquan, Zhang Xinwei, Li Jun, Wang Tong, Fan Qikui, Zhu Hao, Yang Zhimao, Kong Chuncai
Ministry of Education Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter, Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic Physics, School of Physics, Xi'an Jiaotong University, Xi'an 710049, P.R. China.
Shaanxi Coal and Chemical Industry Technology Development Center Co., Ltd., Xi'an 710100, Shaanxi, P.R. China.
iScience. 2023 Sep 26;26(10):108054. doi: 10.1016/j.isci.2023.108054. eCollection 2023 Oct 20.
Peroxymonosulfate (PMS)-based advanced oxidation processes in liquid phase systems can actively degrade toluene. In this work, the catechol structural surfactant was introduced to synthesize the dispersed and homogeneous CoFeO nanospheres and embedded into MoS nanoflowers to form magnetically separable heterojunction catalysts. The innovative approach effectively mitigated the traditionally low reduction efficiency of transition metal ions during the heterogeneous activation process. In CoFeO/MoS/PMS system, the toluene removal efficiency remained 95% within 2 h. The contribution of SO, ·O, ·OH, and O was revealed by radical quenching experiment and electron paramagnetic resonance spectroscopy. The results illustrated that MoS offers ample reduction sites for facilitating PMS activation via Fe/Fe redox interactions. Furthermore, an investigation into the toluene degradation pathway within the CoFeO/MoS/PMS system revealed its capability to suppress the formation of toxic byproducts. This ambient-temperature liquid-phase method presented promising route for the removal of industrial volatile organic pollutants.
基于过一硫酸盐（PMS）的液相体系高级氧化过程能够有效降解甲苯。在本研究中，引入了具有儿茶酚结构的表面活性剂来合成分散均匀的CoFeO纳米球，并将其嵌入MoS纳米花中，形成具有磁分离性能的异质结催化剂。这种创新方法有效缓解了传统多相活化过程中过渡金属离子还原效率较低的问题。在CoFeO/MoS/PMS体系中，2小时内甲苯去除率保持在95%。通过自由基猝灭实验和电子顺磁共振光谱揭示了SO、·O、·OH和O的贡献。结果表明，MoS通过Fe/Fe氧化还原相互作用为促进PMS活化提供了充足的还原位点。此外，对CoFeO/MoS/PMS体系中甲苯降解途径的研究表明，该体系能够抑制有毒副产物的形成。这种常温液相方法为去除工业挥发性有机污染物提供了一条有前景的途径。
