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<p>In this study, the Cu-SA/g-C<sub>3</sub>N<sub>4</sub>@2MI(2) catalyst was synthesized using a preassembly strategy; briefly, 2-methylimidazole acts as a structure-directing agent to disperse and immobilize copper in the carbon nitride precursor through bridging. Subsequently, this catalyst was combined with H<sub>2</sub>O<sub>2</sub> to construct a heterogeneous Fenton—like reaction system for the treatment of RhB wastewater. The microscopic morphology and physicochemical properties of the catalyst were characterized by SEM, TEM, XRD, FTIR and XPS. The results show that Cu-SA/g-C<sub>3</sub>N<sub>4</sub>@2MI(2) exhibits a tubular structure with a specific surface area of 77.15&#xa0;m<sup>2</sup>/g, and copper exists in the Cu<sup>+</sup> valence state. The Cu-SA/g-C<sub>3</sub>N<sub>4</sub>@2MI(2) catalyst exhibited the maximum Fenton-like catalytic performance under neutral conditions, with 94.5% degradation of 50&#xa0;mg/L RhB within 1&#xa0;<i>h</i>. The catalyst maintains excellent catalytic performance in a wide pH range (3–11) and has good stability after being recycled for 5 times. The free radical trapping experiments and EPR results showed that <sup>1</sup>O<sub>2</sub> and O<sub>2</sub><sup>•⁻</sup> were the main active species in the degradation process. Based on the characterization analysis and experimental results, a possible pre-assembly strategy for synthesizing the catalyst and the pollutant degradation mechanism are proposed. This innovative synthesis strategy of transition metal doped carbon nitride catalysts based on imidazole ligands provides a new method for rational design of efficient H<sub>2</sub>O<sub>2</sub> activation systems with clear active sites, and establishes a theoretical model basis for the study of metal-nitrogen coordination regulation degradation mechanisms.</p> Graphical Abstract <p></p>

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Monoatomic copper anchored on tubular carbon nitride with high carbon/oxygen abundance via 2-methylimidazole direction: synthesis and catalytic performance

  • 期刊论文

  • 发表日期：

    2025年12月6日

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  • Jianghe Chen,
  • Qingfang Zhang,
  • Xia Zhao,
  • Tianfeng Wang,
  • Yabin Li,
  • Zuoyan Chen,
  • Wenjing Xu,
  • Linhai Yang

摘要

In this study, the Cu-SA/g-C3N4@2MI(2) catalyst was synthesized using a preassembly strategy; briefly, 2-methylimidazole acts as a structure-directing agent to disperse and immobilize copper in the carbon nitride precursor through bridging. Subsequently, this catalyst was combined with H2O2 to construct a heterogeneous Fenton—like reaction system for the treatment of RhB wastewater. The microscopic morphology and physicochemical properties of the catalyst were characterized by SEM, TEM, XRD, FTIR and XPS. The results show that Cu-SA/g-C3N4@2MI(2) exhibits a tubular structure with a specific surface area of 77.15 m2/g, and copper exists in the Cu+ valence state. The Cu-SA/g-C3N4@2MI(2) catalyst exhibited the maximum Fenton-like catalytic performance under neutral conditions, with 94.5% degradation of 50 mg/L RhB within 1 h. The catalyst maintains excellent catalytic performance in a wide pH range (3–11) and has good stability after being recycled for 5 times. The free radical trapping experiments and EPR results showed that 1O2 and O2•⁻ were the main active species in the degradation process. Based on the characterization analysis and experimental results, a possible pre-assembly strategy for synthesizing the catalyst and the pollutant degradation mechanism are proposed. This innovative synthesis strategy of transition metal doped carbon nitride catalysts based on imidazole ligands provides a new method for rational design of efficient H2O2 activation systems with clear active sites, and establishes a theoretical model basis for the study of metal-nitrogen coordination regulation degradation mechanisms.

Graphical Abstract