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Article Dans Une Revue Chemical Engineering and Processing: Process Intensification Année : 2020

Study of permeate flux behavior during photo-filtration using photocatalytic composite membranes

Résumé

Photocatalytic PVDF-TiO2 composite membranes were prepared by phase separation method. It was found that the membrane surface became more hydrophilic under UV irradiation, as characterized by a decrease in water contact angle after the membranes were exposed to UV. The photo-induced superhydrophilicity phenomenon of TiO2 was attributed to such increase in membrane hydrophilicity. As a result, when filtration of pure water was performed under UV irradiation (photo-filtration), a gradual increase of permeate flux could be obtained over time. The role of UV irradiation mode on flux behavior during photo-filtration was investigated. Effective flux recovery could only be achieved under UV irradiances equal or higher than a threshold value. A flux “memory” effect was observed, in which the flux remained higher than its initial value for a certain duration even after irradiation was stopped, suggesting that the photo-filtration process could be more efficient if UV irradiation was operated in a on/off basis instead of a full-time one. In the scope of this study, five irradiation modes were selected, and based on the experimental data obtained from our lab-scale photo-filtration system, results of the cost/efficiency balance for a large-scale photo-filtration system were extrapolated. It was found that photo-filtration can be performed efficiently yet still economically.

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hal-03388686 , version 1 (21-07-2022)

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Duc-Trung Tran, Julie Mendret, Jean-Pierre Mericq, Catherine Faur, Stephan Brosillon. Study of permeate flux behavior during photo-filtration using photocatalytic composite membranes. Chemical Engineering and Processing: Process Intensification, 2020, 148, pp.107781. ⟨10.1016/j.cep.2019.107781⟩. ⟨hal-03388686⟩
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