Photocatalytic BiOX mortars under visible light irradiation: Compatibility, NOx efficiency and nitrate selectivity
| Autor: | Marta Castellote, Maria Grande, Azael Martínez de la Cruz, Magaly Y. Nava-Núñez, Eva Jimenez-Relinque |
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| Přispěvatelé: | Consejo Nacional de Ciencia y Tecnología (México) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Oxide Cement chemistry.chemical_element 02 engineering and technology NOx lcsh:Chemical technology 010402 general chemistry 01 natural sciences Catalysis Bismuth lcsh:Chemistry Absorbance chemistry.chemical_compound lcsh:TP1-1185 Physical and Theoretical Chemistry Photocatalysis selectivity BiOCl 021001 nanoscience & nanotechnology 0104 chemical sciences lcsh:QD1-999 chemistry Chemical engineering Visible BiOI 0210 nano-technology Selectivity Visible spectrum |
| Zdroj: | Catalysts, Vol 10, Iss 2, p 226 (2020) Digital.CSIC. Repositorio Institucional del CSIC instname Catalysts Volume 10 Issue 2 |
| Popis: | This article belongs to the Special Issue Innovative Catalytic and Photocatalytic Systems for Environmental Remediation. The use of new photocatalysts active under visible light in cement-based building materials represents one interesting alternative to improve the air quality in the urban areas. This work undertakes the feasibility of using BiOX (X = Cl and I) as an addition on mortars for visible-light-driven NOx removal. The interaction between BiOX photocatalysts and cement matrix, and the influence of their addition on the inherent properties of the cement-based materials was studied. The NO removal by the samples ranking as follows BiOCl-cem > BiOI-cem > TiO2-cem. The higher efficiency under visible light of BiOCl-cem might be ascribed to the presence of oxygen vacancies together with a strong oxidation potential. BiOI-cem suffers a phase transformation of BiOI in alkaline media to an I-deficient bismuth oxide compound with poor visible light absorbance capability. However, BiOI-cem showed considerably higher nitrate selectivity that resulted in the highest NOx global removal efficiency. These results can make its use more environmentally sustainable than TiO2 and BiOCl cement composites. We wish to thank to CONACYT for its invaluable financial support through scholarship to Magaly Yajaira Nava Núñez. |
| Databáze: | OpenAIRE |
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