Efficient surface Hydroxyl-to-Hydroxyl radical conversion on layered double hydroxide via High-Efficiency hydroxyl...

Area of Science:

• Materials Science
• Environmental Chemistry
• Photocatalysis

Background:

• Activating hydroxyl groups in layered double hydroxides (LDHs) for photocatalytic hydroxyl radical (·OH) generation is crucial.
• Pristine LDHs require structural modification to convert surface hydroxyl groups to ·OH under visible light.

Purpose of the Study:

• To develop a novel composite material for efficient ·OH generation from LDHs under visible light.
• To investigate the mechanism of ·OH generation and its application in environmental pollutant oxidation.

Main Methods:

• Synthesis of a composite material combining nickel-iron layered double hydroxide (NiFe-LDHs) with bismuth oxycarbonate (BOC).
• Utilized in-situ spectroscopic analyses and theoretical simulations to elucidate the reaction mechanism.
• Evaluated the photocatalytic performance for nitrogen monoxide (NO) oxidation.

Main Results:

• The BOC/NiFe-LDHs composite demonstrated sustained and efficient transformation of NiFe-LDHs hydroxyl groups into ·OH.
• Visible light illumination induced hot holes in BOC to capture and convert surface OH⁻ from NiFe-LDHs into ·OH.
• Achieved a NO removal efficiency of 54.5%, which is 2.23 times higher than that of pristine BOC.

Conclusions:

• The developed BOC/NiFe-LDHs composite is a promising material for visible-light-driven photocatalysis.
• The synergistic effect between BOC and NiFe-LDHs significantly enhances ·OH generation and pollutant degradation.
• This strategy offers a new pathway for designing advanced photocatalysts for environmental applications.