Mechanochemical Synthesis of Visible Light Sensitive Titanium Dioxide Photocatalyst
Phase transition of anatase nanoparticles into the phases TiO2-II and rutile under grinding was studied. The addition of ammonium carbamate to the reaction mixture inhibits the phase conversion and the cold welding of particles. The UV-visible absorption spectrum showed narrowing the band gap width...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2011-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2011/156941 |
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| author | Jan Šubrt Jose M. Criado Lórant Szatmáry Maria J. Diánez-Millán Nataliya Murafa Luis A. Pérez-Maqueda Vlasta Brezová |
| author_facet | Jan Šubrt Jose M. Criado Lórant Szatmáry Maria J. Diánez-Millán Nataliya Murafa Luis A. Pérez-Maqueda Vlasta Brezová |
| author_sort | Jan Šubrt |
| collection | DOAJ |
| description | Phase transition of anatase nanoparticles into the phases TiO2-II and rutile under grinding was studied. The addition of ammonium carbamate to the reaction mixture inhibits the phase conversion and the cold welding of particles. The UV-visible absorption spectrum showed narrowing the band gap width after grinding with an ammonium carbamate additive resulting in shift of the light absorption of the ground sample towards the visible region. By EPR, intensive formation of OH• radical at irradiation of the sample with both UV (λ > 300 nm) and visible (λ > 435 nm) light was observed. High photocatalytic activity of the ground sample in visible light region was demonstrated also by measurement of kinetics of the photocatalytic decomposition of 4-chlorophenol. |
| format | Article |
| id | doaj-art-5c832179af0e4389a8cc79bf38226d25 |
| institution | Kabale University |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2011-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-5c832179af0e4389a8cc79bf38226d252025-02-03T05:44:23ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2011-01-01201110.1155/2011/156941156941Mechanochemical Synthesis of Visible Light Sensitive Titanium Dioxide PhotocatalystJan Šubrt0Jose M. Criado1Lórant Szatmáry2Maria J. Diánez-Millán3Nataliya Murafa4Luis A. Pérez-Maqueda5Vlasta Brezová6Centre of Instrumental Techniques, Institute of Inorganic Chemistry of the AS CR, v.v.i., 250 68 Řež, Czech RepublicDepartment of Mechanochemistry and Reactivity of Materials, Instituto de Ciencias de Materiales de Sevilla C.S.I.C., Americo Vespucio s/n, Isla de la Cartuja, 41092 Sevilla, SpainCentre of Instrumental Techniques, Institute of Inorganic Chemistry of the AS CR, v.v.i., 250 68 Řež, Czech RepublicDepartment of Mechanochemistry and Reactivity of Materials, Instituto de Ciencias de Materiales de Sevilla C.S.I.C., Americo Vespucio s/n, Isla de la Cartuja, 41092 Sevilla, SpainCentre of Instrumental Techniques, Institute of Inorganic Chemistry of the AS CR, v.v.i., 250 68 Řež, Czech RepublicDepartment of Mechanochemistry and Reactivity of Materials, Instituto de Ciencias de Materiales de Sevilla C.S.I.C., Americo Vespucio s/n, Isla de la Cartuja, 41092 Sevilla, SpainInstitute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 812 37 Bratislava, SlovakiaPhase transition of anatase nanoparticles into the phases TiO2-II and rutile under grinding was studied. The addition of ammonium carbamate to the reaction mixture inhibits the phase conversion and the cold welding of particles. The UV-visible absorption spectrum showed narrowing the band gap width after grinding with an ammonium carbamate additive resulting in shift of the light absorption of the ground sample towards the visible region. By EPR, intensive formation of OH• radical at irradiation of the sample with both UV (λ > 300 nm) and visible (λ > 435 nm) light was observed. High photocatalytic activity of the ground sample in visible light region was demonstrated also by measurement of kinetics of the photocatalytic decomposition of 4-chlorophenol.http://dx.doi.org/10.1155/2011/156941 |
| spellingShingle | Jan Šubrt Jose M. Criado Lórant Szatmáry Maria J. Diánez-Millán Nataliya Murafa Luis A. Pérez-Maqueda Vlasta Brezová Mechanochemical Synthesis of Visible Light Sensitive Titanium Dioxide Photocatalyst International Journal of Photoenergy |
| title | Mechanochemical Synthesis of Visible Light Sensitive Titanium Dioxide Photocatalyst |
| title_full | Mechanochemical Synthesis of Visible Light Sensitive Titanium Dioxide Photocatalyst |
| title_fullStr | Mechanochemical Synthesis of Visible Light Sensitive Titanium Dioxide Photocatalyst |
| title_full_unstemmed | Mechanochemical Synthesis of Visible Light Sensitive Titanium Dioxide Photocatalyst |
| title_short | Mechanochemical Synthesis of Visible Light Sensitive Titanium Dioxide Photocatalyst |
| title_sort | mechanochemical synthesis of visible light sensitive titanium dioxide photocatalyst |
| url | http://dx.doi.org/10.1155/2011/156941 |
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