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Graphitic Carbon Nitride Nanosheets Decorated with Cu-Doped Carbon Dots for the Detection and Degradation of Phenolic Pollutants

文献类型： 外文期刊

作者： Li, Qiulan 1 ; Yang, Dezhi 1 ; Yin, Qinhong 2 ; Li, Wanyi 3 ; Yang, Yaling 1 ;

作者机构： 1.Kunming Univ Sci & Technol, Fac Life Sci & Technol, Kunming 650500, Yunnan, Peoples R China

2.Yunnan Police Coll, Kunming 650223, Yunnan, Peoples R China

3.Yunnan Acad Agr Sci, Inst Med Plants, Kunming 650205, Yunnan, Peoples R China

关键词： copper-doped carbon dots; graphitic carbon nitride; oxidase-like activity; peroxidase-like activity; phenolic substances

期刊名称：ACS APPLIED NANO MATERIALS （ 影响因子：6.14； 五年影响因子：6.104 ）

ISSN：

年卷期： 2022 年 5 卷 2 期

页码：

收录情况： SCI

摘要： The heterogeneous Cu-based solid catalysts have attracted enormous attention of researchers in different potential applications. In this work, a graphitic carbon nitride/copper-doped carbon dots (g-C3N4/Cu-CDs) nanocomposite with both intrinsic peroxidase-and oxidase-like (POD-and OXD-like) activities was successfully prepared. Due to the synergistic catalytic enhancement and electron transmission provided by g-C3N4, both POD-and OXD-like activities of g-C3N4/Cu-CDs were significa n t l y improved compared with those of g-C3N4 and Cu-CDs. Moreover, upon the addition of H2O2, g-C3N4/Cu-CDs could catalyze the oxidation of colorless o-phenylenediamine (OPD) to form a yellow fluorescent product 2,3-diaminophenazine (DAP) with yellow fluorescence. Interestingly, the OPD + H2O2 + g-C3N4/Cu-CDs system could be inhibited by phenolic compounds, which could efliciently decrease the DAP fluorescence. Based on this, a method for the quantitative detection of total phenolic substances was established. Meanwhile, the use of OXD-like activity of nanocomposites was extended for the degradation of phenols (e.g., 2-CP), which showed a good degradation efliciency. Based on the result that the conversion of Cu+/Cu2+/Cu-0 plays pivotal roles in promoting the generation of radicals (i.e., center dot OH and center dot O-2(-)), a possible catalytic mechanism of g-C3N4/Cu-CDs was deduced. These findings showed that the proposed g-C3N4/Cu-CDs exhibit great potential to become a green catalyst for the degradation of phenolic pollutants in the environment.

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