Iron-Modified Titanate Nanorods for Oxidation of Aqueous Ammonia Using Combined Treatment with Ozone and Solar Light Irradiation
Sodium titanate nanorods were synthesized by a hydrothermal method and subsequently modified with an iron precursor. For comparison, Fe<sub>2</sub>O<sub>3</sub> nanocubes were also obtained through a similar hydrothermal treatment. Pristine, Fe-modified nanorods and Fe<sub...
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MDPI AG
2022-06-01
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| Online Access: | https://www.mdpi.com/2073-4344/12/6/666 |
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| author | Silviu Preda Polona Umek Maria Zaharescu Crina Anastasescu Simona Viorica Petrescu Cătălina Gîfu Diana-Ioana Eftemie Razvan State Florica Papa Ioan Balint |
| author_facet | Silviu Preda Polona Umek Maria Zaharescu Crina Anastasescu Simona Viorica Petrescu Cătălina Gîfu Diana-Ioana Eftemie Razvan State Florica Papa Ioan Balint |
| author_sort | Silviu Preda |
| collection | DOAJ |
| description | Sodium titanate nanorods were synthesized by a hydrothermal method and subsequently modified with an iron precursor. For comparison, Fe<sub>2</sub>O<sub>3</sub> nanocubes were also obtained through a similar hydrothermal treatment. Pristine, Fe-modified nanorods and Fe<sub>2</sub>O<sub>3</sub> nanocubes were suspended in diluted ammonia solutions (20 ppm) and exposed to ozone and simulated light irradiation. Ammonia abatement, together with the resulting nitrogen-containing products (NO<sub>3</sub><sup>−</sup>), was monitored by ion chromatography measurements. The generation of reactive oxygen species (·OH and O<sub>2</sub><sup>−</sup>) in the investigated materials and their photoelectrochemical behaviour were also investigated. Morphological and structural characterizations (SEM, XRD, XRF, UV–Vis, H<sub>2</sub>-TPR, NH<sub>3</sub>-TPD, PL, PZC) of the studied catalysts were correlated with their activity for ammonia degradation with ozone- and photo-assisted oxidation. An increase in ammonia conversion and a decreasing amount of NO<sub>3</sub><sup>−</sup> were achieved by combining the above-mentioned processes. |
| first_indexed | 2024-03-10T00:11:39Z |
| format | Article |
| id | doaj.art-f84ff4de8f1740eca1ea67491959f07e |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-10T00:11:39Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-f84ff4de8f1740eca1ea67491959f07e2023-11-23T16:00:15ZengMDPI AGCatalysts2073-43442022-06-0112666610.3390/catal12060666Iron-Modified Titanate Nanorods for Oxidation of Aqueous Ammonia Using Combined Treatment with Ozone and Solar Light IrradiationSilviu Preda0Polona Umek1Maria Zaharescu2Crina Anastasescu3Simona Viorica Petrescu4Cătălina Gîfu5Diana-Ioana Eftemie6Razvan State7Florica Papa8Ioan Balint9“Ilie Murgulescu” Institute of Physical-Chemistry of the Romanian Academy, 202 Splaiul Independentei, 060021 Bucharest, RomaniaJožef Stefan Institute, Jamova Cesta 39, 1000 Ljubljana, Slovenia“Ilie Murgulescu” Institute of Physical-Chemistry of the Romanian Academy, 202 Splaiul Independentei, 060021 Bucharest, Romania“Ilie Murgulescu” Institute of Physical-Chemistry of the Romanian Academy, 202 Splaiul Independentei, 060021 Bucharest, Romania“Ilie Murgulescu” Institute of Physical-Chemistry of the Romanian Academy, 202 Splaiul Independentei, 060021 Bucharest, RomaniaNational Research and Development Institute for Chemistry and Petrochemistry, 060021 Bucharest, Romania“Ilie Murgulescu” Institute of Physical-Chemistry of the Romanian Academy, 202 Splaiul Independentei, 060021 Bucharest, Romania“Ilie Murgulescu” Institute of Physical-Chemistry of the Romanian Academy, 202 Splaiul Independentei, 060021 Bucharest, Romania“Ilie Murgulescu” Institute of Physical-Chemistry of the Romanian Academy, 202 Splaiul Independentei, 060021 Bucharest, Romania“Ilie Murgulescu” Institute of Physical-Chemistry of the Romanian Academy, 202 Splaiul Independentei, 060021 Bucharest, RomaniaSodium titanate nanorods were synthesized by a hydrothermal method and subsequently modified with an iron precursor. For comparison, Fe<sub>2</sub>O<sub>3</sub> nanocubes were also obtained through a similar hydrothermal treatment. Pristine, Fe-modified nanorods and Fe<sub>2</sub>O<sub>3</sub> nanocubes were suspended in diluted ammonia solutions (20 ppm) and exposed to ozone and simulated light irradiation. Ammonia abatement, together with the resulting nitrogen-containing products (NO<sub>3</sub><sup>−</sup>), was monitored by ion chromatography measurements. The generation of reactive oxygen species (·OH and O<sub>2</sub><sup>−</sup>) in the investigated materials and their photoelectrochemical behaviour were also investigated. Morphological and structural characterizations (SEM, XRD, XRF, UV–Vis, H<sub>2</sub>-TPR, NH<sub>3</sub>-TPD, PL, PZC) of the studied catalysts were correlated with their activity for ammonia degradation with ozone- and photo-assisted oxidation. An increase in ammonia conversion and a decreasing amount of NO<sub>3</sub><sup>−</sup> were achieved by combining the above-mentioned processes.https://www.mdpi.com/2073-4344/12/6/666titanate nanorodsFe-modified titanateFe<sub>2</sub>O<sub>3</sub> nanocubesammonia catalytic ozonation assisted by solar light |
| spellingShingle | Silviu Preda Polona Umek Maria Zaharescu Crina Anastasescu Simona Viorica Petrescu Cătălina Gîfu Diana-Ioana Eftemie Razvan State Florica Papa Ioan Balint Iron-Modified Titanate Nanorods for Oxidation of Aqueous Ammonia Using Combined Treatment with Ozone and Solar Light Irradiation Catalysts titanate nanorods Fe-modified titanate Fe<sub>2</sub>O<sub>3</sub> nanocubes ammonia catalytic ozonation assisted by solar light |
| title | Iron-Modified Titanate Nanorods for Oxidation of Aqueous Ammonia Using Combined Treatment with Ozone and Solar Light Irradiation |
| title_full | Iron-Modified Titanate Nanorods for Oxidation of Aqueous Ammonia Using Combined Treatment with Ozone and Solar Light Irradiation |
| title_fullStr | Iron-Modified Titanate Nanorods for Oxidation of Aqueous Ammonia Using Combined Treatment with Ozone and Solar Light Irradiation |
| title_full_unstemmed | Iron-Modified Titanate Nanorods for Oxidation of Aqueous Ammonia Using Combined Treatment with Ozone and Solar Light Irradiation |
| title_short | Iron-Modified Titanate Nanorods for Oxidation of Aqueous Ammonia Using Combined Treatment with Ozone and Solar Light Irradiation |
| title_sort | iron modified titanate nanorods for oxidation of aqueous ammonia using combined treatment with ozone and solar light irradiation |
| topic | titanate nanorods Fe-modified titanate Fe<sub>2</sub>O<sub>3</sub> nanocubes ammonia catalytic ozonation assisted by solar light |
| url | https://www.mdpi.com/2073-4344/12/6/666 |
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