Abstract：The Fe2O3, Fe3N, single-atom Fe (SA-Fe) and N-doped magnetic graphene (Fe-MNG) were prepared by a facile one-pot method and applied for the activation of perpxymonosulfate (PMS). The results show that Fe-MNG/PMS system was efficient for the oxidative degradation of sulfisoxazole (SIZ) over a wide pH range (3~10) with the removal percentages over 99%. After five cycles, degradation percentages of SIZ maintain over 95% by using the recycled Fe-MNG catalyst. The multiple catalytic sites such as SA-Fe and N of Fe-MNG can effectively activate PMS for the generation of various reactive oxygen species (ROS). Quenching experiment and electron paramagnetic resonance spectroscopy showed that SO4·-, HO· and 1O2 were produced in the Fe-MNG/PMS system, demonstrating the co-existence of free radicals and non-radicals processes. In addition, the Fe-MNG possesses large surface area (446.18m2/g), which can pre-concentrate organic micropollutants onto its surface by adsorption, simultaneously producing a large amount of ROS via PMS activation, leading to the in-situ and high-efficiency oxidation and removal of organic micropollutants. The Fe-MNG also possesses magnetic properties which can be easily recycled, indicating its great application potential.
杨柳, 刘丹, 刘世昂, 吴西林, 陈建荣. 多活性位点的磁性氮掺杂石墨烯活化过一硫酸盐研究[J]. 中国环境科学, 2021, 41(9): 4127-4134.
YANG liu, LIU Dan, LIU Shi-ang, WU Xi-lin, CHEN Jian-rong. Magnetic N-doped graphene with multiple catalytic sites for efficient activiation of peroxymonosulfate. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 4127-4134.
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