Magnetic N-doped graphene with multiple catalytic sites for efficient activiation of peroxymonosulfate

YANG liu; LIU Dan; LIU Shi-ang; WU Xi-lin; CHEN Jian-rong

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China Environmental Science ›› 2021, Vol. 41 ›› Issue (9) : 4127-4134.

Water Pollution Control

Magnetic N-doped graphene with multiple catalytic sites for efficient activiation of peroxymonosulfate

YANG liu, LIU Dan, LIU Shi-ang, WU Xi-lin, CHEN Jian-rong

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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.

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adsorption / advanced oxidation process / graphene / peroxymonosulfate / single-atom catalysis

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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[J]. China Environmental Science. 2021, 41(9): 4127-4134

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