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Toward scaling-up photocatalytic process for multiphase environmental applications

Mohamed Gar Alalm, Ridha Djellabi, Daniela Meroni, Carlo Pirola, Claudia Letizia Bianchi and Daria Camilla Boffito

Article (2021)

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Abstract

Recently, we have witnessed a booming development of composites and multi-dopant metal oxides to be employed as novel photocatalysts. Yet the practical application of photocatalysis for environmental purposes is still elusive. Concerns about the unknown fate and toxicity of nanoparticles, unsatisfactory performance in real conditions, mass transfer limitations and durability issues have so far discouraged investments in full-scale applications of photocatalysis. Herein, we provide a critical overview of the main challenges that are limiting large-scale application of photocatalysis in air and water/wastewater purification. We then discuss the main approaches reported in the literature to tackle these shortcomings, such as the design of photocatalytic reactors that retain the photocatalyst, the study of degradation of micropollutants in different water matrices, and the development of gas-phase reactors with optimized contact time and irradiation. Furthermore, we provide a critical analysis of research–practice gaps such as treatment of real water and air samples, degradation of pollutants with actual environmental concentrations, photocatalyst deactivation, and cost and environmental life-cycle assessment.

Uncontrolled Keywords

air pollution; photocatalysis; reactors; wastewater; water matrix; scaling up

Subjects: 1000 Civil engineering > 1006 Hydrologic engineering
1500 Environmental engineering > 1500 Environmental engineering
1500 Environmental engineering > 1503 Air and noise pollution
1800 Chemical engineering > 1800 Chemical engineering
Department: Department of Chemical Engineering
Funders: Fonds de recherche du Québec–Nature et technologies (FRQNT), Velux Stiftung Foundation, Canada Research Chair program
Grant number: 2021-PR-284416
PolyPublie URL: https://publications.polymtl.ca/9375/
Journal Title: Catalysts (vol. 11, no. 5)
Publisher: MDPI
DOI: 10.3390/catal11050562
Official URL: https://doi.org/10.3390/catal11050562
Date Deposited: 07 Dec 2022 14:31
Last Modified: 08 Apr 2024 13:17
Cite in APA 7: Alalm, M. G., Djellabi, R., Meroni, D., Pirola, C., Bianchi, C. L., & Boffito, D. C. (2021). Toward scaling-up photocatalytic process for multiphase environmental applications. Catalysts, 11(5), 562 (23 pages). https://doi.org/10.3390/catal11050562

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