Efficient reduction-oxidation coupling degradation of nitroaromatic compounds in continuous flow processes.

Area of Science:

• Environmental Chemistry
• Materials Science
• Catalysis

Background:

• Nitroaromatic compounds (NACs) are persistent pollutants requiring effective degradation methods.
• Advanced oxidation processes (AOPs) show promise but face challenges in NAC ring-opening and large-scale application.

Purpose of the Study:

• To design a reduction-oxidation coupling (ROC) process for efficient NAC degradation.
• To investigate the role of Cu doping in LaFeO3 on carbon fiber cloth (LFCO@CFC) for enhanced NAC removal.

Main Methods:

• Development of a LaFe0.95Cu0.05O3@carbon fiber cloth (LFCO@CFC) catalyst.
• Implementation of a continuous flow system utilizing the LFCO@CFC catalyst, peroxymonosulfate (PMS), and visible light (Vis).
• Analysis of the degradation pathways involving photoreduction and subsequent oxidation by radicals and non-radicals.

Main Results:

• The ROC process effectively removed and mineralized NACs under environmental conditions.
• Cu doping facilitated photoelectron transfer, promoting -NO2 photoreduction and ring opening.
• The LFCO@CFC catalyst demonstrated superior performance, lower cost, and higher processing capacity compared to existing catalysts.

Conclusions:

• The designed ROC process is a highly effective and scalable method for degrading NACs.
• The LFCO@CFC catalyst exhibits excellent durability and catalytic activity for practical environmental applications.
• This study presents a promising approach for tackling refractory pollutants in wastewater treatment.