Layered double hydroxide based materials applied in persulfate based advanced oxidation processes: Property,...

Area of Science:

• Environmental Science
• Materials Science
• Chemistry

Background:

• Persulfate-based advanced oxidation processes (persulfate-AOPs) are effective for refractory contaminant treatment.
• Layered double hydroxides (LDHs) possess advantageous physicochemical properties for catalysis.

Purpose of the Study:

• To review LDHs and their composites as catalysts in persulfate-AOPs.
• To discuss the mechanisms of persulfate activation by LDH-based materials.
• To summarize catalytic performance and propose future research directions.

Main Methods:

• Classification of LDH-based materials based on composite components.
• Detailed discussion of radical and nonradical persulfate activation mechanisms.
• Summary of catalytic performance for contaminant degradation.

Main Results:

• LDH-based materials, including metal and carbonaceous composites, effectively activate persulfate.
• Mechanisms involve bimetallic synergism, carbonaceous material roles, and singlet oxygen production.
• Various LDH-based catalysts demonstrate significant performance in contaminant removal.

Conclusions:

• LDH-based catalysts are promising for persulfate-AOPs in environmental remediation.
• Further research into reaction mechanisms and catalyst development is warranted.
• This review provides insights for advancing LDH-based catalysts in water treatment.