Mesoporous SiC-Based Photocatalytic Membranes and Coatings for Water Treatment
Photocatalytically active silicon carbide (SiC)-based mesoporous layers (pore sizes between 5 and 30 nm) were synthesized from preceramic polymers (polymer-derived ceramic route) on the surface and inside the pores of conventional macroporous α-alumina supports. The hybrid membrane system obtained,...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-07-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/13/7/672 |
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| author | Karla Begonia Cervantes-Diaz Martin Drobek Anne Julbe André Ayral Julien Cambedouzou |
| author_facet | Karla Begonia Cervantes-Diaz Martin Drobek Anne Julbe André Ayral Julien Cambedouzou |
| author_sort | Karla Begonia Cervantes-Diaz |
| collection | DOAJ |
| description | Photocatalytically active silicon carbide (SiC)-based mesoporous layers (pore sizes between 5 and 30 nm) were synthesized from preceramic polymers (polymer-derived ceramic route) on the surface and inside the pores of conventional macroporous α-alumina supports. The hybrid membrane system obtained, coupling the separation and photocatalytical properties of SiC thin films, was characterized by different static and dynamic techniques, including gas and liquid permeation measurements. The photocatalytic activity was evaluated by considering the degradation efficiency of a model organic pollutant (methylene blue, MB) under UV light irradiation in both diffusion and permeation modes using SiC-coated macroporous supports. Specific degradation rates of 1.58 × 10<sup>−8</sup> mol s<sup>−1</sup> m<sup>−2</sup> and 7.5 × 10<sup>−9</sup> mol s<sup>−1</sup> m<sup>−2</sup> were obtained in diffusion and permeation modes, respectively. The performance of the new SiC/α-Al<sub>2</sub>O<sub>3</sub> materials compares favorably to conventional TiO<sub>2</sub>-based photocatalytic membranes, taking advantage of the attractive physicochemical properties of SiC. The developed synthesis strategy yielded original photocatalytic SiC/α-Al<sub>2</sub>O<sub>3</sub> composites with the possibility to couple the ultrafiltration SiC membrane top-layer with the SiC-functionalized (photocatalytic) macroporous support. Such SiC-based materials and their rational associations on porous supports offer promising potential for the development of efficient photocatalytic membrane reactors and contactors for the continuous treatment of polluted waters. |
| first_indexed | 2024-03-11T00:51:18Z |
| format | Article |
| id | doaj.art-e81d4b3001254d38956d41f83057c87f |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-11T00:51:18Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-e81d4b3001254d38956d41f83057c87f2023-11-18T20:26:43ZengMDPI AGMembranes2077-03752023-07-0113767210.3390/membranes13070672Mesoporous SiC-Based Photocatalytic Membranes and Coatings for Water TreatmentKarla Begonia Cervantes-Diaz0Martin Drobek1Anne Julbe2André Ayral3Julien Cambedouzou4Institut Européen des Membranes, IEM–UMR 5635, Univ Montpellier, CNRS, ENSCM, 34095 Montpellier, FranceInstitut Européen des Membranes, IEM–UMR 5635, Univ Montpellier, CNRS, ENSCM, 34095 Montpellier, FranceInstitut Européen des Membranes, IEM–UMR 5635, Univ Montpellier, CNRS, ENSCM, 34095 Montpellier, FranceInstitut Européen des Membranes, IEM–UMR 5635, Univ Montpellier, CNRS, ENSCM, 34095 Montpellier, FranceInstitut Européen des Membranes, IEM–UMR 5635, Univ Montpellier, CNRS, ENSCM, 34095 Montpellier, FrancePhotocatalytically active silicon carbide (SiC)-based mesoporous layers (pore sizes between 5 and 30 nm) were synthesized from preceramic polymers (polymer-derived ceramic route) on the surface and inside the pores of conventional macroporous α-alumina supports. The hybrid membrane system obtained, coupling the separation and photocatalytical properties of SiC thin films, was characterized by different static and dynamic techniques, including gas and liquid permeation measurements. The photocatalytic activity was evaluated by considering the degradation efficiency of a model organic pollutant (methylene blue, MB) under UV light irradiation in both diffusion and permeation modes using SiC-coated macroporous supports. Specific degradation rates of 1.58 × 10<sup>−8</sup> mol s<sup>−1</sup> m<sup>−2</sup> and 7.5 × 10<sup>−9</sup> mol s<sup>−1</sup> m<sup>−2</sup> were obtained in diffusion and permeation modes, respectively. The performance of the new SiC/α-Al<sub>2</sub>O<sub>3</sub> materials compares favorably to conventional TiO<sub>2</sub>-based photocatalytic membranes, taking advantage of the attractive physicochemical properties of SiC. The developed synthesis strategy yielded original photocatalytic SiC/α-Al<sub>2</sub>O<sub>3</sub> composites with the possibility to couple the ultrafiltration SiC membrane top-layer with the SiC-functionalized (photocatalytic) macroporous support. Such SiC-based materials and their rational associations on porous supports offer promising potential for the development of efficient photocatalytic membrane reactors and contactors for the continuous treatment of polluted waters.https://www.mdpi.com/2077-0375/13/7/672silicon carbidemesoporous membranephotocatalysismembrane reactor |
| spellingShingle | Karla Begonia Cervantes-Diaz Martin Drobek Anne Julbe André Ayral Julien Cambedouzou Mesoporous SiC-Based Photocatalytic Membranes and Coatings for Water Treatment Membranes silicon carbide mesoporous membrane photocatalysis membrane reactor |
| title | Mesoporous SiC-Based Photocatalytic Membranes and Coatings for Water Treatment |
| title_full | Mesoporous SiC-Based Photocatalytic Membranes and Coatings for Water Treatment |
| title_fullStr | Mesoporous SiC-Based Photocatalytic Membranes and Coatings for Water Treatment |
| title_full_unstemmed | Mesoporous SiC-Based Photocatalytic Membranes and Coatings for Water Treatment |
| title_short | Mesoporous SiC-Based Photocatalytic Membranes and Coatings for Water Treatment |
| title_sort | mesoporous sic based photocatalytic membranes and coatings for water treatment |
| topic | silicon carbide mesoporous membrane photocatalysis membrane reactor |
| url | https://www.mdpi.com/2077-0375/13/7/672 |
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