Mixed Metal Oxide W-TiO 2 Nanopowder for Environmental Process: Synergy of Adsorption and Photocatalysis.
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| Title: | Mixed Metal Oxide W-TiO 2 Nanopowder for Environmental Process: Synergy of Adsorption and Photocatalysis. |
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| Authors: | Cheng, Khley1 (AUTHOR) chengkhley@yahoo.com, Heng, Socheata1 (AUTHOR) socheataheng3579@gmail.com, Tieng, Siteng1 (AUTHOR) tiengsiteng@gmail.com, David, Ford1 (AUTHOR) forddavidaus@gmail.com, Dine, Sarah2 (AUTHOR) sarah.dine@lspm.cnrs.fr, Haddad, Oriana2 (AUTHOR) oriana.haddad@cnrs.fr, Colbeau-Justin, Christophe3 (AUTHOR) christophe.colbeau-justin@universite-paris-saclay.fr, Traore, Mamadou2 (AUTHOR) mamadou.traore@lspm.cnrs.fr, Kanaev, Andrei2 (AUTHOR) andrei.kanaev@lspm.cnrs.fr |
| Source: | Nanomaterials (2079-4991). May2024, Vol. 14 Issue 9, p765. 18p. |
| Subjects: | Photocatalysis, Metallic oxides, Adsorption (Chemistry), Industrial wastes, Tungsten trioxide, Visible spectra, Factories, Methylene blue |
| Abstract: | A mixed metal oxide W-TiO2 nanopowder photocatalyst was prepared by using the sol–gel method with a broad range of elemental compositions x = CW/(CW + CTi), including TiO2 and WO3. The material was structurally characterized and evaluated in adsorption and photocatalytic processes by testing its removal capacity of a representative pollutant methylene blue (MB) in aqueous solutions and under UV-A and sunlight illuminations. The nanopowders appeared to be more effective adsorbents than pure TiO2 and WO3 materials, showing a maximum at 15 mol% W, which was set as the tungsten solubility limit in anatase titania. At the same time, the photocatalytic decomposition of MB peaked at 2 mol% W. The examination of different compositions showed that the most effective MB removal took place at 15 mol% W, which was attributed to the combined action of adsorption and heterogeneous photocatalysis. Moreover, MB decomposition under sunlight was stronger than under UV-A, suggesting photocatalyst activation by visible light. The pollutant removal efficiency of the material with 15 mol% W was enhanced by a factor of ~10 compared to pure TiO2 at the beginning of the process, which shows its high potential for use in depollution processes in emergency cases of a great pollutant leak. As a result, a Wx=0.15-TiO2 catalyst could be of high interest for wastewater purification in industrial plants. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | A mixed metal oxide W-TiO2 nanopowder photocatalyst was prepared by using the sol–gel method with a broad range of elemental compositions x = CW/(CW + CTi), including TiO2 and WO3. The material was structurally characterized and evaluated in adsorption and photocatalytic processes by testing its removal capacity of a representative pollutant methylene blue (MB) in aqueous solutions and under UV-A and sunlight illuminations. The nanopowders appeared to be more effective adsorbents than pure TiO2 and WO3 materials, showing a maximum at 15 mol% W, which was set as the tungsten solubility limit in anatase titania. At the same time, the photocatalytic decomposition of MB peaked at 2 mol% W. The examination of different compositions showed that the most effective MB removal took place at 15 mol% W, which was attributed to the combined action of adsorption and heterogeneous photocatalysis. Moreover, MB decomposition under sunlight was stronger than under UV-A, suggesting photocatalyst activation by visible light. The pollutant removal efficiency of the material with 15 mol% W was enhanced by a factor of ~10 compared to pure TiO2 at the beginning of the process, which shows its high potential for use in depollution processes in emergency cases of a great pollutant leak. As a result, a Wx=0.15-TiO2 catalyst could be of high interest for wastewater purification in industrial plants. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 20794991 |
| DOI: | 10.3390/nano14090765 |
