Photocatalytic Air Purification Using Functional Polymeric Carbon Nitrides

Area of Science:

• Environmental Science
• Materials Science
• Catalysis

Background:

• Air pollution poses significant threats to human health and the environment.
• Polymeric carbon nitride (PCN) based photocatalysts have emerged as a key technology for addressing air pollution.
• Existing literature lacks a systematic review of PCN applications in air pollutant degradation.

Purpose of the Study:

• To review the research progress of functional PCN-based composite materials for photocatalytic air pollutant removal.
• To elucidate the working mechanisms behind PCN enhancement modifications.
• To provide perspectives on future challenges, directions, and design strategies for PCN photocatalysts.

Main Methods:

• Comprehensive literature review of PCN-based photocatalysts for air purification.
• Analysis of structural modifications (nanostructure, molecular, composite) and their impact on photocatalytic performance.
• Discussion of mechanisms including light absorption, reactant adsorption, charge kinetics, and reactive oxygen species production.

Main Results:

• PCN photocatalysts demonstrate enhanced performance through visible light harvesting, layered/defective structures, functional groups, tunable band positions, and Lewis basic sites.
• Various structural modifications significantly influence light absorption, reactant adsorption, charge transfer, and reactive oxygen species generation.
• PCN-based photocatalysis offers a pathway to convert harmful pollutants into valuable or less toxic substances.

Conclusions:

• PCN-based photocatalysts are effective for heterogeneous catalysis of air pollutants, offering environmental remediation benefits.
• Understanding structure-activity relationships is crucial for optimizing PCN photocatalyst design.
• Further research into PCN design strategies is needed to overcome current challenges in air purification.