Photocatalytic Materials and Mechanisms for Environmental Remediation

Photocatalytic processes harness light energy to drive chemical transformations that detoxify water and air, offering a sustainable route to tackle pollutants ranging from heavy metals and dyes to pharmaceuticals and plastic residues. Central to this approach are semiconductor materials that absorb photons to generate electron–hole pairs; these charge carriers migrate to active sites where they produce reactive species capable of oxidising or reducing contaminants. Innovations in material design—such as constructing heterojunctions to improve charge separation, engineering internal electric fields at the molecular level, and incorporating plasmonic nanostructures—have markedly enhanced photocatalytic efficiency under visible light. Metal oxides, carbon nitrides, metal–organic frameworks and emerging molecular photosystems each contribute unique optoelectronic properties. Contemporary research explores S-scheme architectures, directional charge steering and tailored surface chemistries to extend catalyst lifetimes and broaden spectral absorption. These advances underpin practical applications in wastewater treatment, air purification and resource recovery, underscoring the global significance of photocatalysis for environmental remediation.

Research from Nature Portfolio

Recent studies have demonstrated the power of molecular engineering to boost charge separation and redox potential. Monolayer nanosheets bearing carboxyl functionalities exhibit reinforced internal electric fields that drive electron migration to catalytic sites, achieving unprecedented hydrogen evolution rates and enhanced pollutant reduction under visible light. Separately, two-dimensional Janus bilayers formed by oriented assembly of distinct semiconductor monolayers steer photo-induced carriers via an internal field, yielding ultralong carrier lifetimes and superior solar-to-chemical conversion. These foundational designs highlight the importance of atomic-level control over interfacial properties to suppress recombination and elevate photocatalytic performance.

Photocatalytic Materials and Mechanisms for Environmental Remediation publication trend

The graph below shows the total number of articles in photocatalytic materials and mechanisms for environmental remediation across all publications each year (not limited to Nature Index journals).

Technical terms

Photocatalyst: A material that accelerates chemical reactions upon light absorption without being consumed.

Electron–hole pair: A photo-excited electron and its corresponding positive charge (hole) created in a semiconductor.

Heterojunction: An interface between two semiconductors with different band structures that enhances charge separation.

S-scheme charge transfer: A heterojunction mode where electrons and holes migrate in opposite directions to maintain strong redox potential.

Plasmonic effect: Amplification of local electromagnetic fields by metal nanostructures to enhance light absorption and carrier generation.

References

1. Perylenetetracarboxylic acid nanosheets with internal electric fields and anisotropic charge migration for photocatalytic hydrogen evolution. Nature Communications (2022).
2. Superior visible light hydrogen evolution of Janus bilayer junctions via atomic-level charge flow steering. Nature Communications (2016).
3. A plasmonic S-scheme Au/MIL-101(Fe)/BiOBr photocatalyst for efficient synchronous decontamination of Cr(VI) and norfloxacin antibiotic. eScience (2024).
4. Constructing Cd0.5Zn0.5S/Bi2WO6 S-scheme heterojunction for boosted photocatalytic antibiotic oxidation and Cr(VI) reduction. Advanced Powder Materials (2023).