Mn-based catalysts for sulfate radical-based advanced oxidation processes: A review

Area of Science:

• Environmental Chemistry
• Materials Science
• Catalysis

Background:

• Sulfate radical-based advanced oxidation processes (AOPs) are gaining prominence for water treatment.
• Manganese-based materials are efficient catalysts for activating peroxymonosulfate (PMS) and peroxydisulfate (PDS).

Purpose of the Study:

• To comprehensively review Mn-based materials for PMS and PDS activation.
• To summarize activation mechanisms, influencing factors, characterization, and experimental considerations.

Main Methods:

• Review of existing literature on Mn-based catalysts for PMS/PDS activation.
• Analysis of radical and non-radical degradation pathways.
• Discussion of factors affecting catalytic performance.

Main Results:

• Various Mn-based materials (MnO_x, hybrids, composites) activate PMS/PDS through diverse mechanisms, including free radical and non-radical pathways.
• Factors like pH, ions, NOM, and temperature significantly influence catalytic activity.
• Characterization techniques and experimental design considerations are crucial for understanding performance.

Conclusions:

• Mn-based catalysts offer versatile pathways for PMS/PDS activation in AOPs.
• Optimizing catalyst design and experimental conditions is key for efficient contaminant removal.
• Further research should focus on cost-effective material development and mechanistic insights.