Singlet Oxygen Triggered by Superoxide Radicals in a Molybdenum Cocatalytic Fenton Reaction with Enhanced REDOX Activity in the Environment

单线态氧 化学 激进的 氧化还原 光化学 超氧化物 活性氧 氧气 无机化学 有机化学 生物化学
作者
Qiuying Yi,Jiahui Ji,Bin Shen,Chencheng Dong,Jun Liu,Jinlong Zhang,Mingyang Xing
出处
期刊:Environmental Science & Technology [American Chemical Society]
卷期号:53 (16): 9725-9733 被引量:600
标识
DOI:10.1021/acs.est.9b01676
摘要

As an important reactive oxygen species (ROS) with selective oxidation, singlet oxygen (1O2) has wide application prospects in biology and the environment. However, the mechanism of 1O2 formation, especially the conversion of superoxide radicals (·O2–) to 1O2, has been a great controversy. This process is often disturbed by hydroxyl radicals (·OH). Here, we develop a molybdenum cocatalytic Fenton system, which can realize the transformation from ·O2– to 1O2 on the premise of minimizing ·OH. The Mo0 exposed on the surface of molybdenum powder can significantly improve the Fe3+/Fe2+ cycling efficiency and weaken the production of ·OH, leading to the generation of ·O2–. Meanwhile, the exposed Mo6+ can realize the transformation of ·O2– to 1O2. The molybdenum cocatalytic effect makes the conventional Fenton reaction have high oxidation activity for the remediation of organic pollutants and prompts the inactivation of Staphylococcus aureus, as well as the adsorption and reduction of heavy metal ions (Cu2+, Ni2+, and Cr6+). Compared with iron powder, molybdenum powder is more likely to promote the conversion from Fe3+ to Fe2+ during the Fenton reaction, resulting in a higher Fe2+/Fe3+ ratio and better activity regarding the remediation of organics. Our findings clarify the transformation mechanism from ·O2– to 1O2 during the Fenton-like reaction and provide a promising REDOX Fenton-like system for water treatment.
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