Porphyrin-Based Photocatalytic Systems for Organic Contaminant Degradation

Porphyrin macrocycles, renowned for their intense light absorption and tunable redox properties, have emerged as versatile photosensitisers in heterogeneous photocatalysis for water treatment. By coupling porphyrins with semiconductor supports—such as titanium dioxide, zinc oxide or polymeric matrices—researchers extend photoactivity into the visible spectrum, harnessing solar irradiation to drive oxidation of organic pollutants. Upon light excitation, porphyrins inject electrons into the conduction band of the support or transfer energy to molecular oxygen, generating reactive oxygen species that mineralise dyes, pesticides and pharmaceutical residues. Immobilisation strategies range from covalent anchoring on polymer beads to axial‐ligand coordination on oxide surfaces, balancing strong binding with efficient charge separation. These composites combine high turnover, recyclability and low secondary pollution, offering sustainable routes to degrade emerging contaminants in diverse water sources. Continued innovation in porphyrin design and support engineering promises to enhance light harvesting, broaden contaminant scope and facilitate scalable remediation technologies with global relevance.

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Porphyrin-Based Photocatalytic Systems for Organic Contaminant Degradation publication trend

The graph below shows the total number of articles in porphyrin-based photocatalytic systems for organic contaminant degradation across all publications each year (not limited to Nature Index journals).

Technical terms

Porphyrin: A conjugated organic macrocycle bearing four pyrrole subunits, notable for strong visible-light absorption and metal‐binding ability.

Photocatalysis: A light-driven process in which a semiconductor or dye generates reactive species that oxidatively decompose organic molecules.

Heterogeneous catalyst: A solid material that facilitates chemical transformations of dissolved substrates without dissolving itself, enabling easy separation and reuse.

Visible-light sensitisation: Extension of photocatalyst activity into the visible spectrum by incorporating dyes or complexes that absorb longer-wavelength photons.

Reactive oxygen species: Highly reactive intermediates such as singlet oxygen or hydroxyl radicals formed during photoexcitation, responsible for degrading pollutants.

References

1. Catalytic activity of Mn(III) porphyrin complex supported onto cross linked polymers in the green oxidation of malathion with hydrogen peroxide in aqueous solution. Arabian Journal of Chemistry (2023).
2. Surface Modification of ZnO with Sn(IV)-Porphyrin for Enhanced Visible Light Photocatalytic Degradation of Amaranth Dye. Molecules (2023).
3. Titanium(IV) oxide nanoparticles functionalized with various meso-porphyrins for efficient photocatalytic degradation of ibuprofen in UV and visible light. Journal of Environmental Chemical Engineering (2022).