Photocatalytic CO2 reduction to high value‐added C2 products (e.g., C2H4) is of considerable interest but challenging. The C2H4 product selectivity strongly hinges on the intermediate energy levels in the CO2 reduction pathway. Herein, Cu–N4 sites anchored phosphorus‐modulated carbon nitride (CuACs/PCN) is designed as a photocatalyst to tailor the intermediate energy levels in the the C2H4 formation reaction pathway for realizing its high production with tunable selectivity. Theoretical calculations combined with experimental data demonstrate that the formation of the C−C coupling intermediates can be realized on Cu–N4 sites and the surrounding doped P facilitates the production of C2H4. Thus, CuACs/PCN exhibits a high C2H4 selectivity of 53.2% with a yielding rate of 30.51 µmol g−1. The findings reveal the significant role of the coordination environment and surrounding microenvironment of Cu single atoms in C2H4 formation and offer an effective approach for highly selective CO2 photoreduction to produce C2H4.

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Bismuth oxyiodide and attapulgite have been proven to be the potential materials for the removal of the emerging contaminants in wastewater. In this work, the bismuth oxyiodide/attapulgite (BIA-x) composites with...

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The cobalt metal–organic framework (Co-MOF) is a kind of crystalline porous material within a periodic network structure, which is formed via the self-assembly of a Co metal center and a bridged organic ligand. In this paper, a Co-MOF was facilely synthesized via an ultrasonic method and applied to enhance the chemiluminescence (CL) emission of the NaIO4-H2O2 system. The synthesized Co-MOF was nanosheet-like in nature and stacked in 2–3-micrometer flower shapes. Compared to the NaIO4-H2O2 system without a Co-MOF, the CL intensity of the Co-MOF-NaIO4-H2O2 system was enhanced about 70 times. This CL mechanism was determined to be a result of the synergistic effects of chemiluminescence resonance energy transfer (CRET) and electron–hole annihilation (EHA). The Co-MOF not only acted as a catalyst to accelerate the generation of reactive oxygen species in the CL reaction, but also worked as an emitter to further enhance the CL. Based on the Co-MOF-NaIO4-H2O2 system, a highly sensitive CL analysis method was established for pyrogallol (PG) detection. Addition of PG into the CL system generated 1O2*, which could transfer energy to the Co-MOF and further enhance the CL response. The enhanced CL was linear with the PG concentration. The CL analysis method exhibited a linear range of 1 × 10−4 M to 1 × 10−7 M, as well as having a linear correlation coefficient of 0.9995 and a limit of detection of (S/N = 3) of 34 nM.