Embedded iron and nitrogen co-doped carbon quantum dots within g-C3N4 as an exceptional PMS photocatalytic activator for sulfamethoxazole degradation: The key role of Fe-N bridge

文献类型： 外文期刊

第一作者： Zhang, Pingping

作者： Zhang, Pingping;Cao, Xiao;Gu, Lin;Yu, Haixiang;Liu, Yifan;Liu, Xinyue;Gao, Yutao;Zhang, Hanlin;Wu, Feiyan;Zhang, Hanlin

作者机构：

关键词： Peroxymonosulfate; Photodegradation; Fe3+/Fe2+cycling; Carbon quantum dots; Graphite-phase carbon nitride

期刊名称：SEPARATION AND PURIFICATION TECHNOLOGY （ 影响因子：8.6； 五年影响因子：7.8 ）

ISSN： 1383-5866

年卷期： 2024 年 342 卷

页码：

收录情况： SCI

摘要： The covalent modification of graphite -phase carbon nitride (g-C3N4 ) by carbon quantum dots (CQDs) is a promising way to improve its photocatalytic performance. Although CQDs can act as charge mediator for electrons storage and transfer, it is crucial to construct efficient interfaces, which serves as active sites for tight connect with g-C3N4 and fast release of electrons. Herein, a novel iron and nitrogen co -doped carbon quantum dots (Fe, N-CQDs) assembled g-C3N4 composite (FNCCN) was constructed via Fe-N bridge by hydrothermal and thermal polymerization methods. The FNCNN rivaled popular nitrogen -doped carbon quantum dots (N-CQDs) combined with g-C3N4 composites for peroxymonosulfate (PMS) activation and degradation of sulfamethoxazole (SMX). The SMX degradation rate (0.0963 min(-1)) is 5.38 and 3.15 times higher than that of g-C3N4 and N-CQDs/ g-C3N4 . The characterization and DFT calculation results suggest that Fe, N-CQDs was successfully incorporated into carbon matrix of g-C3N4 via Fe-N covalent bond, which joints the two counterparts closely and creates electron transport channels for higher electrons transfer efficiency. The Fe-N coordinated structure promotes PMS reduction on Fe2+ of Fe-N sites for center dot HO and SO4 center dot- production and expedited photo carries separation through Fe3+/Fe2+ cycling. In addition, the degradation efficiency, ROS identification, EPR test and degradation pathway of SMX was determined, and the intermediate toxicity of degradation products was predicted. This work constructed a tight atomic -level connection between hydrophobic g-C3N4 and hydrophilic CQDs, which improved an effective strategy for accelerating electron transport and efficient photocatalytic activation of PMS.

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