Photocatalytic Techniques for Chromium(VI) Reduction

Photocatalytic reduction of hexavalent chromium (Cr(VI)) has emerged as an environmentally benign route to convert toxic Cr(VI) into the less harmful trivalent form (Cr(III)) under light irradiation. Central to this approach is the design of semiconductor-based materials—often functionalised with ligands, heterojunctions or porous supports—to harness solar or visible light, generate electron–hole pairs and drive redox reactions on the catalyst surface. Key performance parameters include light-absorption range, charge-carrier separation efficiency, surface area and catalyst stability. Advances in material architectures such as metal–organic frameworks (MOFs), spinel ferrite heterostructures, doped oxides and carbonaceous composites have broadened the toolbox for effective Cr(VI) detoxification. Mechanistic insights reveal that optimising band-edge positions and interfacial contacts mitigates charge recombination and facilitates rapid electron transfer to adsorbed Cr(VI) species. Beyond fundamental materials optimisation, practical deployment under natural sunlight and in complex wastewater matrices highlights the global significance of photocatalytic Cr(VI) techniques for industrial effluent treatment and remediation of contaminated water bodies.

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Photocatalytic Techniques for Chromium(VI) Reduction publication trend

The graph below shows the total number of articles in photocatalytic techniques for chromium(vi) reduction across all publications each year (not limited to Nature Index journals).

Technical terms

Photocatalyst: A material that absorbs light to generate electron–hole pairs, driving redox reactions without being consumed.

Heterojunction: An interface between two semiconductors with differing band structures, designed to promote charge separation and transfer.

Metal–organic framework (MOF): A porous crystalline network of metal nodes and organic linkers, often used to support or enhance photocatalytic activity.

Band gap: The energy difference between a semiconductor’s valence and conduction bands that determines its light-absorption threshold.

Cr(VI) reduction: The electron-driven conversion of toxic hexavalent chromium to its less toxic trivalent state, a key detoxification process.

References

1. Advances in photocatalytic reduction of hexavalent chromium: From fundamental concepts to materials design and technology challenges. Journal of Water Process Engineering (2022).
2. Mesoporous Composite Networks of Linked MnFe2O4 and ZnFe2O4 Nanoparticles as Efficient Photocatalysts for the Reduction of Cr(VI). Catalysts (2021).
3. Porphyrin Modified UiO-66-NH2 for Highly Efficient Photoreduction of Cr(VI) under Visible Light. Catalysts (2023).
4. Application of modified pumice particles with a metal-organic composite prepared by m-phenylenediamine an Iron (II) for photoreduction of Cr(VI) under visible light. Environmental Technology & Innovation (2024).