Vacancy pairs regulate BiOBr microstructure for efficient dimethyl phthalate removal under visible light irradiation

Area of Science:

• Environmental Science
• Materials Science
• Catalysis

Background:

• Efficient removal of phthalate esters (PAEs) from water is crucial.
• Current photocatalyst strategies often overlook PAE degradation specifics.
• Photocatalyst modification typically focuses on charge separation.

Purpose of the Study:

• To develop an effective strategy for PAE photodegradation using defect engineering.
• To investigate the role of vacancy pair defects in photocatalysis.
• To enhance the removal efficiency of PAEs in water.

Main Methods:

• Synthesis of BiOBr photocatalyst with "Bi-Br" vacancy pairs.
• Experimental characterization of the photocatalyst.
• Theoretical calculations (e.g., DFT) to understand defect mechanisms.
• Photocatalytic degradation experiments for PAEs.

Main Results:

• The "Bi-Br" vacancy pair BiOBr exhibited excellent photocatalytic activity for PAE removal.
• "Bi-Br" vacancy pairs improved charge separation efficiency.
• Vacancy pairs altered O2 adsorption, accelerating reactive oxygen species (ROS) formation.
• Enhanced adsorption and activation of PAEs on the photocatalyst surface were observed.

Conclusions:

• Introducing "Bi-Br" vacancy pairs is an effective strategy for designing highly active photocatalysts.
• Defect engineering, specifically vacancy pairs, offers a novel approach for PAE treatment in water.
• This work provides insights into optimizing photocatalysts for environmental pollutant degradation.