Metalated carbon nitrides were designed and prepared by metalation of carbon nitrides with alkali metal ions, and the metalated carbon nitrides with potassium act as efficient base catalysts for hydrolysis of COS at low temperature.
The techniques for the production of the environment have received attention because of the increasing air pollution, which results in a negative impact on the living environment of mankind. Over the decades, burgeoning interest in polymeric carbon nitride (PCN) based photocatalysts for heterogeneous catalysis of air pollutants has been witnessed, which is improved by harvesting visible light, layered/defective structures, functional groups, suitable/adjustable band positions, and existing Lewis basic sites. PCN-based photocatalytic air purification can reduce the negative impacts of the emission of air pollutants and convert the undesirable and harmful materials into value-added or nontoxic, or low-toxic chemicals. However, based on previous reports, the systematic summary and analysis of PCN-based photocatalysts in the catalytic elimination of air pollutants have not been reported. The research progress of functional PCN-based composite materials as photocatalysts for the removal of air pollutants is reviewed here. The working mechanisms of each enhancement modification are elucidated and discussed on structures (nanostructure, molecular structue, and composite) regarding their effects on light-absorption/utilization, reactant adsorption, intermediate/product desorption, charge kinetics, and reactive oxygen species production. Perspectives related to further challenges and directions as well as design strategies of PCN-based photocatalysts in the heterogeneous catalysis of air pollutants are also provided.
A major challenge in the nitride‐based materials for photocatalytic oxidation reaction is their low stability under oxidizing and acidic environment. To solve these problems, highly crystallized hexagonal boron carbon nitride (BCN) with more homogeneous mixing of B, C, and N atoms is achieved by pyrolysis of precursor materials in the presence of NaOH as a crystallization promoter. The high crystallinity and chemical homogeneity features of the fabricated BCN reduce the structural defects and accelerate the interfacial charge transfer and separation, thus inhibiting the self‐oxidation and endowing it with a superior oxidation resistance. With these prominent advantages, the highly crystallized BCN exhibits markedly enhanced photocatalytic activity and long‐term anticorrosion stability under oxygen and self‐generated acidic condition, far beyond polycrystalline BCN. This work offers new insights into the catalyst design of crystalline BCN and demonstrates its great promise for solar energy applications.
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