Engineering S-Scheme Heterojunction via MOF-on-MOF for Photocatalytic Nitroarene Hydrogenation

Area of Science:

• Materials Science
• Catalysis
• Nanotechnology

Background:

• Photocatalytic nitroarene reduction is key for sustainable aniline production.
• S-scheme heterostructures enhance photocatalyst performance via efficient charge transfer.
• Metal-organic frameworks (MOFs) offer tunable structures for heterojunction construction.

Purpose of the Study:

• To construct a 2D-on-3D MOF S-scheme heterojunction for improved photocatalysis.
• To investigate the photocatalytic performance of the novel heterojunction for nitroarene reduction.
• To explore the structure-activity relationship in MOF-based S-scheme systems.

Main Methods:

• Synthesized a 2D Pd-PPF-1/3D Pd-PCN-222 S-scheme heterojunction using presurface modification.
• Characterized the catalyst's morphology and structure.
• Evaluated the photocatalytic activity for nitroarene hydrogenation.

Main Results:

• The Pd-PPF-1/Pd-PCN-222 catalyst exhibited superior photocatalytic performance compared to individual components and physical mixtures.
• The S-scheme heterojunction effectively separated photogenerated carriers while retaining redox capabilities.
• The catalyst displayed a unique 2D nanoflower on 3D rod morphology.

Conclusions:

• The 2D-on-3D MOF S-scheme heterojunction design is a viable strategy for high-performance photocatalysis.
• This approach offers controllable morphology and enhanced photocatalytic activity for sustainable chemical synthesis.
• The study provides a constructive route for designing advanced MOF-based photocatalysts.