Enhanced photocatalytic oxidation of free cyanide using hydrogen-treated TiO2: effect of reduction temperature
Hydrogen-treated titanium dioxide (grey TiO _2 ) crystals were synthesized through a temperature-programmed reduction of commercial TiO _2 under an H _2 /Ar mixed gas flow at elevated temperatures ranging from 600 to 800 °C. Analytical techniques, including Raman spectroscopy and x-ray Photoelectron...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | Materials Research Express |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2053-1591/ad0af0 |
| _version_ | 1797462647175643136 |
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| author | Mitzy Y Pérez-Patiño José M Barrera-Andrade Elizabeth Rojas-García Lina A Calzada Jhon Harrison Sierra-Uribe Ciro Falcony Miguel A Valenzuela Elim Albiter |
| author_facet | Mitzy Y Pérez-Patiño José M Barrera-Andrade Elizabeth Rojas-García Lina A Calzada Jhon Harrison Sierra-Uribe Ciro Falcony Miguel A Valenzuela Elim Albiter |
| author_sort | Mitzy Y Pérez-Patiño |
| collection | DOAJ |
| description | Hydrogen-treated titanium dioxide (grey TiO _2 ) crystals were synthesized through a temperature-programmed reduction of commercial TiO _2 under an H _2 /Ar mixed gas flow at elevated temperatures ranging from 600 to 800 °C. Analytical techniques, including Raman spectroscopy and x-ray Photoelectron Spectroscopy (XPS), were employed to probe the presence of oxygen vacancies in the grey TiO _2 and to track the variation in Ti ^3+ species concentration as a function of temperature. The reduced samples obtained at different temperatures were used as photocatalysts to oxidize free cyanide ions under UV light illumination. Among these, the photocatalysts reduced at 600 °C demonstrated superior activity, converting 30 ppm of free cyanide to cyanate ions within 120 min. This reaction time represents a significant enhancement in efficiency as compared to untreated TiO _2 , which necessitated over 240 min to accomplish the same conversion. The improved performance of grey TiO _2 is ascribed to its elevated photocurrent and the positive shift in the flat band energy, which together accelerate electron transfer and limit electron–hole recombination rates. |
| first_indexed | 2024-03-09T17:39:34Z |
| format | Article |
| id | doaj.art-565a6a1d99c8423b86b4f41f86f9cc8c |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-09T17:39:34Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-565a6a1d99c8423b86b4f41f86f9cc8c2023-11-24T11:41:58ZengIOP PublishingMaterials Research Express2053-15912023-01-01101111550710.1088/2053-1591/ad0af0Enhanced photocatalytic oxidation of free cyanide using hydrogen-treated TiO2: effect of reduction temperatureMitzy Y Pérez-Patiño0José M Barrera-Andrade1https://orcid.org/0000-0003-0527-8143Elizabeth Rojas-García2Lina A Calzada3https://orcid.org/0000-0003-4910-5359Jhon Harrison Sierra-Uribe4Ciro Falcony5Miguel A Valenzuela6Elim Albiter7https://orcid.org/0000-0002-1065-5401Laboratorio de Catálisis y Materiales, ESIQIE-Instituto Politécnico Nacional, Zacatenco, 07738 CDMX, MexicoLaboratorio de Catálisis y Materiales, ESIQIE-Instituto Politécnico Nacional, Zacatenco, 07738 CDMX, MexicoLaboratorio de Catálisis y Materiales, ESIQIE-Instituto Politécnico Nacional, Zacatenco, 07738 CDMX, Mexico; Área de Ingeniería Química, Universidad Autónoma Metropolitana-Iztapalapa , Av. San Rafael Atlixco186, Col. Vicentina, Iztapalapa, 09340 CDMX, MexicoLaboratorio de Catálisis y Materiales, ESIQIE-Instituto Politécnico Nacional, Zacatenco, 07738 CDMX, MexicoDepartamento de Química, Universidad Autónoma Metropolitana-Iztapalapa , Av. San Rafael Atlixco186, Col. Vicentina, Iztapalapa, 09340 CDMX, MexicoCentro de Investigación y Estudios Avanzados del Instituto Politécnico Nacional, A.P.14-740, 07360, CDMX, MexicoLaboratorio de Catálisis y Materiales, ESIQIE-Instituto Politécnico Nacional, Zacatenco, 07738 CDMX, MexicoLaboratorio de Catálisis y Materiales, ESIQIE-Instituto Politécnico Nacional, Zacatenco, 07738 CDMX, MexicoHydrogen-treated titanium dioxide (grey TiO _2 ) crystals were synthesized through a temperature-programmed reduction of commercial TiO _2 under an H _2 /Ar mixed gas flow at elevated temperatures ranging from 600 to 800 °C. Analytical techniques, including Raman spectroscopy and x-ray Photoelectron Spectroscopy (XPS), were employed to probe the presence of oxygen vacancies in the grey TiO _2 and to track the variation in Ti ^3+ species concentration as a function of temperature. The reduced samples obtained at different temperatures were used as photocatalysts to oxidize free cyanide ions under UV light illumination. Among these, the photocatalysts reduced at 600 °C demonstrated superior activity, converting 30 ppm of free cyanide to cyanate ions within 120 min. This reaction time represents a significant enhancement in efficiency as compared to untreated TiO _2 , which necessitated over 240 min to accomplish the same conversion. The improved performance of grey TiO _2 is ascribed to its elevated photocurrent and the positive shift in the flat band energy, which together accelerate electron transfer and limit electron–hole recombination rates.https://doi.org/10.1088/2053-1591/ad0af0oxygen vacancyhydrogen reductionphotocatalysishydrogenated TiO2 anatase |
| spellingShingle | Mitzy Y Pérez-Patiño José M Barrera-Andrade Elizabeth Rojas-García Lina A Calzada Jhon Harrison Sierra-Uribe Ciro Falcony Miguel A Valenzuela Elim Albiter Enhanced photocatalytic oxidation of free cyanide using hydrogen-treated TiO2: effect of reduction temperature Materials Research Express oxygen vacancy hydrogen reduction photocatalysis hydrogenated TiO2 anatase |
| title | Enhanced photocatalytic oxidation of free cyanide using hydrogen-treated TiO2: effect of reduction temperature |
| title_full | Enhanced photocatalytic oxidation of free cyanide using hydrogen-treated TiO2: effect of reduction temperature |
| title_fullStr | Enhanced photocatalytic oxidation of free cyanide using hydrogen-treated TiO2: effect of reduction temperature |
| title_full_unstemmed | Enhanced photocatalytic oxidation of free cyanide using hydrogen-treated TiO2: effect of reduction temperature |
| title_short | Enhanced photocatalytic oxidation of free cyanide using hydrogen-treated TiO2: effect of reduction temperature |
| title_sort | enhanced photocatalytic oxidation of free cyanide using hydrogen treated tio2 effect of reduction temperature |
| topic | oxygen vacancy hydrogen reduction photocatalysis hydrogenated TiO2 anatase |
| url | https://doi.org/10.1088/2053-1591/ad0af0 |
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