A review on recent advancements in photocatalytic remediation for harmful inorganic and organic gases

Due to the continuous increase in industrial pollution and modern lifestyle, several types of air contaminants and their concentrations are emerging in the atmosphere. Besides, photocatalysis has gained much attention in the elimination of air pollution. Several ultraviolet and visible light active photocatalysts were tested in air pollutant treatment and thereby, the number of reports was increased in the past few years. In this context, this review describes the photocatalytic treatment of gaseous inorganic contaminants like NOx, H2S, and organic pollutants like formaldehyde, acetaldehyde, and benzene derivatives. Different photocatalysts with their air pollutant removal efficiency were explained. Improving strategies such as metal/non-metal doping, composite formation for photocatalyst activities have been studied. Moreover, an analysis is presented from each of the existing photocatalytic immobilization approaches. Also, factors responsible for effective photocatalysis were explained. Overall, the photocatalytic abatement technique is an auspicious way to eliminate different air contaminants. Besides, existing drawbacks and future challenges are also discussed.

Automated summary

This review discusses the use of photocatalysis in treating air pollutants, focusing on gaseous inorganic contaminants and organic pollutants. Various photocatalysts and their removal efficiency are explained, along with strategies for improving photocatalyst activities. The analysis of existing photocatalytic immobilization approaches and factors affecting effective photocatalysis are also presented. Overall, photocatalytic abatement is a promising technique for eliminating different air contaminants, while existing drawbacks and future challenges are also discussed.