Study of Nitrogen-Modified Titanium Dioxide as an Adsorbent for Azo Dyes
The removal of two azo dyes from aqueous solution was investigated using a highly active nitrogen-modified titanium dioxide (TiO 2 /N). This photocatalyst was prepared by pressure modification of a commercial sample of anatase, TiO 2 (supplied by Zaklady Chemiczne Police SA, Poland). The adsorption...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SAGE Publications
2008-09-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263-6174.26.7.501 |
| _version_ | 1797285278734352384 |
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| author | Magdalena Janus Julia Choina Ewelina Kusiak Antoni W. Morawski |
| author_facet | Magdalena Janus Julia Choina Ewelina Kusiak Antoni W. Morawski |
| author_sort | Magdalena Janus |
| collection | DOAJ |
| description | The removal of two azo dyes from aqueous solution was investigated using a highly active nitrogen-modified titanium dioxide (TiO 2 /N). This photocatalyst was prepared by pressure modification of a commercial sample of anatase, TiO 2 (supplied by Zaklady Chemiczne Police SA, Poland). The adsorption of two azo dyes (Reactive Red 198 — a monoazo dye and Direct Green 99 — a polyazo dye) onto the unmodified and nitrogen-modified TiO 2 surface was determined. Adsorption onto unmodified TiO 2 led to an isotherm which could be described by the Freundlich model, whereas that onto the nitrogen-modified TiO 2 surface was best described by the Langmuir model. The adsorption isotherms of Direct Green 99 onto TiO 2 /N from aqueous solutions at various pH values were compared with those onto unmodified TiO 2 during dye removal under UV irradiation. Such a comparison is important since it provides information as to how solutes interact with adsorbents. Zeta potential measurements of TiO 2 provided an explanation for the observed behaviour in terms of the surface charge. The IR spectrum of the photocatalyst obtained exhibited new absorption bands at 1430–1440 cm −1 which were attributed to the bending vibrations of NH + 4 and at 1535 cm −1 associated with NH 2 groups or NO 2 and NO groups. |
| first_indexed | 2024-03-07T18:00:53Z |
| format | Article |
| id | doaj.art-a1f3ab0a86554a2aba6ec3fbe23cde1b |
| institution | Directory Open Access Journal |
| issn | 0263-6174 2048-4038 |
| language | English |
| last_indexed | 2024-03-07T18:00:53Z |
| publishDate | 2008-09-01 |
| publisher | SAGE Publications |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj.art-a1f3ab0a86554a2aba6ec3fbe23cde1b2024-03-02T10:52:09ZengSAGE PublicationsAdsorption Science & Technology0263-61742048-40382008-09-012610.1260/0263-6174.26.7.501Study of Nitrogen-Modified Titanium Dioxide as an Adsorbent for Azo DyesMagdalena Janus0Julia Choina1Ewelina Kusiak2Antoni W. Morawski3 Department of Water Technology and Environment Engineering, Institute of Chemical and Environment Engineering, Szczecin University of Technology, ul. Pulaskiego 10, 70-322 Szczecin, Poland Department of Water Technology and Environment Engineering, Institute of Chemical and Environment Engineering, Szczecin University of Technology, ul. Pulaskiego 10, 70-322 Szczecin, Poland Department of Water Technology and Environment Engineering, Institute of Chemical and Environment Engineering, Szczecin University of Technology, ul. Pulaskiego 10, 70-322 Szczecin, Poland Department of Water Technology and Environment Engineering, Institute of Chemical and Environment Engineering, Szczecin University of Technology, ul. Pulaskiego 10, 70-322 Szczecin, PolandThe removal of two azo dyes from aqueous solution was investigated using a highly active nitrogen-modified titanium dioxide (TiO 2 /N). This photocatalyst was prepared by pressure modification of a commercial sample of anatase, TiO 2 (supplied by Zaklady Chemiczne Police SA, Poland). The adsorption of two azo dyes (Reactive Red 198 — a monoazo dye and Direct Green 99 — a polyazo dye) onto the unmodified and nitrogen-modified TiO 2 surface was determined. Adsorption onto unmodified TiO 2 led to an isotherm which could be described by the Freundlich model, whereas that onto the nitrogen-modified TiO 2 surface was best described by the Langmuir model. The adsorption isotherms of Direct Green 99 onto TiO 2 /N from aqueous solutions at various pH values were compared with those onto unmodified TiO 2 during dye removal under UV irradiation. Such a comparison is important since it provides information as to how solutes interact with adsorbents. Zeta potential measurements of TiO 2 provided an explanation for the observed behaviour in terms of the surface charge. The IR spectrum of the photocatalyst obtained exhibited new absorption bands at 1430–1440 cm −1 which were attributed to the bending vibrations of NH + 4 and at 1535 cm −1 associated with NH 2 groups or NO 2 and NO groups.https://doi.org/10.1260/0263-6174.26.7.501 |
| spellingShingle | Magdalena Janus Julia Choina Ewelina Kusiak Antoni W. Morawski Study of Nitrogen-Modified Titanium Dioxide as an Adsorbent for Azo Dyes Adsorption Science & Technology |
| title | Study of Nitrogen-Modified Titanium Dioxide as an Adsorbent for Azo Dyes |
| title_full | Study of Nitrogen-Modified Titanium Dioxide as an Adsorbent for Azo Dyes |
| title_fullStr | Study of Nitrogen-Modified Titanium Dioxide as an Adsorbent for Azo Dyes |
| title_full_unstemmed | Study of Nitrogen-Modified Titanium Dioxide as an Adsorbent for Azo Dyes |
| title_short | Study of Nitrogen-Modified Titanium Dioxide as an Adsorbent for Azo Dyes |
| title_sort | study of nitrogen modified titanium dioxide as an adsorbent for azo dyes |
| url | https://doi.org/10.1260/0263-6174.26.7.501 |
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