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| Version | Summary | Created by | Modification | Content Size | Created at | Operation |
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| 1 | Jack Zhong | -- | 204 | 2026-09-28 07:31:38 | | | |
| 2 | Jack Zhong | -12 word(s) | 192 | 2026-09-28 07:32:16 | | |
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Heterogeneous photocatalysis is the acceleration of a chemical reaction by light absorbed in a solid that is not consumed, so that the reaction takes place at the surface of the solid rather than in the surrounding phase. Absorption of a photon with energy above the band gap generates an electron-hole pair; if the pair separates and reaches the surface before recombining, it can reduce an acceptor and oxidise a donor there, and the quantum yield is therefore a competition between transfer and recombination. Titanium dioxide remains the reference material, and iron doping has been examined as a way to extend its absorption into the visible and to slow recombination [1]. Doping with rare-earth elements allows the simultaneous removal of an organic dye and of hexavalent chromium under visible light [2]. Whether an observed disappearance is photocatalytic at all needs a control, as the comparison of direct photolysis with photocatalytic treatment of carbamazepine shows [3]. Supporting the oxide on cellulose avoids the recovery step that a slurry requires [4]. Reactor geometry then decides how much of the absorbed light is actually turned into chemistry [5].
References
- Rosa, D.; Abbasova, N.; Di Palma, L. Titanium Dioxide Nanoparticles Doped with Iron for Water Treatment via Photocatalysis: A Review. Nanomaterials 2024, 14, 293. [CrossRef]
- Wang, Y.; Jiang, L.; Feng, C. Visible-light simultaneous photocatalysis of methyl orange and Cr(VI) in water by rare earth modified titanium dioxide. Desalination and Water Treatment 2014, 52, 4802-4809. [CrossRef]
- Im, J.; Son, H.; Kang, Y.; Zoh, K. Carbamazepine Degradation by Photolysis and Titanium Dioxide Photocatalysis. Water Environment Research 2012, 84, 554-561. [CrossRef]
- Garusinghe, U.M.; Raghuwanshi, V.S.; Batchelor, W.; Garnier, G. Water Resistant Cellulose – Titanium Dioxide Composites for Photocatalysis. Scientific Reports 2018, 8, 2306. [CrossRef]
- Mehling, S.; Schnabel, T.; Londong, J. Investigation on Energetic Efficiency of Reactor Systems for Oxidation of Micro-Pollutants by Immobilized Active Titanium Dioxide Photocatalysis. Water 2022, 14, 2681. [CrossRef]
