Hazardous substances in smoke, such as dust, sulfur dioxide, nitrogen oxides, and others, are primary sources of environmental issues like air pollution, acid rain, and the greenhouse effect. How to effectively remove these substances from smoke is a critical concern.SO2 and nitrogen oxides are causing national concern.

Currently, the most widely used desulfurization technology is the wet flue gas desulfurization process, which boasts high desulfurization efficiency, but is challenging for denitrification. This is because the main component of NOX in flue gas is NO, accounting for over 90% of the total, and it is a colorless, odorless, and inactive gas. It is almost not absorbed in either water or alkaline solutions, except for forming complexes.