ZIF‐67‐Derived 3D Hollow Mesoporous Crystalline Co₃O₄ Wrapped by 2D g‐C₃N₄ Nanosheets for Photocatalytic Removal of Nitric Oxide

Abstract

ZIF‐67‐derived 3D hollow mesoporous crystalline Co3O4 wrapped by 2D graphitic carbon nitride (g‐C3N4) nanosheets are prepared by low temperature annealing, and are used for the photocatalytic oxidation of nitric oxide (NO) at a concentration of 600 ppb. The p–n heterojunction between Co3O4 and g‐C3N4 forms a spatial conductive network frame and results in a broad visible light response range. The hollow mesoporous structure of Co3O4 contributes to the circulation and adsorption of NO, and the large specific surface area exposes abundant active sites for the reaction of active species. A maximum NO degradation efficiency of 57% is achieved by adjusting the mass of the Co3O4 precursor. Cycling tests and X‐ray diffraction indicate the high stability and recyclability of the composite, making it promising in environmental purification applications.

C3N4 modified with single layer ZIF67 nanoparticles for efficient photocatalytic degradation of organic pollutants under visible light

“…1(a), the diffraction peaks of the black pattern at 7.3°, 10.3°, 12.6°, 17.8°, 24.2°, and 26.4° are assigned to zeolite 4A (Co) (ZIF67, PDF#43-0144) crystal planes of (100), (110), (111), (211), (311), and (320), respectively. This is in line with the former studies [29,36]. For C3N4, which is shown as red pattern in the figure, the diffraction peaks at 15.9° and 27.7° are typically indexed to the crystal planes of (100) and (110) of carbon nitrate (C3N4, PDF#50-1250).…”

“…It is worth noting that the diffraction peak at 27.7° of ZIF67-C3N4 was a little wider than that of C3N4. According to the study by Liu and co-workers [29], the strong peak at 27.7° is identified as the conjugated aromatic rings of the interlayer of C3N4. In this case, the insertion of ZIF67 may affect the aromatic rings of C3N4.…”

“…In recent years, metal-organic-frameworks (MOFs) that consist of metal ions and organic ligands emerged and proved to be preeminent templates with super large surface area and excellent porous structure. MOFs have attracted great interest in various applications such as energy storage, separation, and catalysis [26][27][28][29][30]. To date, MOFs have already been employed in the reduction of CO2 [31,32] and O2 [33], and the electrocatalytic evolution of H2 [34] in the past few years.…”

Recent Innovation of Metal-Organic Frameworks for Carbon Dioxide Photocatalytic Reduction

“…In 2019, Wang et al designed a congregated photocatalyst from template zeolitic imidazolate framework-67 (ZIF-67) and Co 3 O 4 of hollow multi-shelled structures (HoMSs) through sequential templating approach (STA) to obtain improved catalytic performance by controlling structure and facets (111) of the catalyst [157]. Given that periodically organized metal atom is filled in ZIF-67 (Co) [307], it is noteworthy that utilizing this MOF as a template results in a profound effect on the overall catalytic activity. Since ZIF-67 is formerly constructed from regularly organized Co metal atom (which has a topological resemblance to Co atom in Co 3 O 4 of HoMSs) and organic ligand, this will assist metal atoms sites and space to associate HoMSs, respectively.…”

The 2D/2D p–n heterojunction of ZnCoMOF/g‐C3N4 with enhanced photocatalytic hydrogen evolution under visible light irradiation

“…At present, several MOFs like ZIF-8, MIL-53, MIL-100, MIL-101, MIL-125, MIL-88B, UiO-66, CuBTC, and BUC-21 are reported to form some binary heterojunction composites with g-C 3 N 4 , which show enhanced photocatalytic performance for water splitting, CO 2 reduction, Cr (VI) reduction, and different organic pollutants degradation. [32][33][34][35] The fact shows that preparation of MOFs/g-C 3 N 4 heterojunction is an effective way to improve the photocatalytic activity of g-C 3 N 4 .…”