Consideration of Photoactivity of TiO<sub>2</sub> Pigments via the Photodegration of Methyl Orange under UV Irradiation
Developing a rapid and reliable method for measuring the photoreactivity of TiO<sub>2</sub> pigments is of great importance for industrial application. The photoactivity of industrial TiO<sub>2</sub> pigments were evaluated via the photodegradation of a model azo dye, methyl...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-09-01
|
| Series: | Materials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1944/15/17/6044 |
| _version_ | 1797494510099365888 |
|---|---|
| author | Shuolin Zhou Junzhuo Bai Keying Huang Xinlu Ye Yingqing Peng Min Lei |
| author_facet | Shuolin Zhou Junzhuo Bai Keying Huang Xinlu Ye Yingqing Peng Min Lei |
| author_sort | Shuolin Zhou |
| collection | DOAJ |
| description | Developing a rapid and reliable method for measuring the photoreactivity of TiO<sub>2</sub> pigments is of great importance for industrial application. The photoactivity of industrial TiO<sub>2</sub> pigments were evaluated via the photodegradation of a model azo dye, methyl orange (MO), in the present work. The TiO<sub>2</sub> pigments were characterized by Fourier-transform infrared spectroscopy (FTIR), ultraviolet–visible (UV–vis) spectroscopy, scanning electron microscopy (SEM), and photoluminescence (PL) spectroscopy. The photoactivity test results showed that the anatase TiO<sub>2</sub> pigment was responsible for accelerating MO degradation, while the rutile pigment acted as a stabilizer, and effective UV absorber retarded the photodegradation of MO. It was found that the photodegradation of MO was driven mainly by photoholes (h<sup>+</sup>) and hydroxyl radicals (•OH), in the presence of TiO<sub>2</sub> pigment with high photoactivity. With the help of the degradation intermediates during the photodegradation process and the calculated data, the preliminary degradation mechanism including azo bond cleaving, h<sup>+</sup> oxidation, and hydroxylated products’ generation for MO was also elucidated. The photoactivity of TiO<sub>2</sub> pigments can be rapidly evaluated in this work, which would be an efficient approach for assessing the product quality control and the end-use performance of TiO<sub>2</sub> pigments. |
| first_indexed | 2024-03-10T01:35:20Z |
| format | Article |
| id | doaj.art-39e10ee4853b4a0186adae951d1d79a6 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T01:35:20Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-39e10ee4853b4a0186adae951d1d79a62023-11-23T13:34:36ZengMDPI AGMaterials1996-19442022-09-011517604410.3390/ma15176044Consideration of Photoactivity of TiO<sub>2</sub> Pigments via the Photodegration of Methyl Orange under UV IrradiationShuolin Zhou0Junzhuo Bai1Keying Huang2Xinlu Ye3Yingqing Peng4Min Lei5School of Elementary Education, Changsha Normal University, South Campus, No. 9, Xingshateli Road, Changsha 410100, ChinaSchool of Elementary Education, Changsha Normal University, South Campus, No. 9, Xingshateli Road, Changsha 410100, ChinaSchool of Elementary Education, Changsha Normal University, South Campus, No. 9, Xingshateli Road, Changsha 410100, ChinaSchool of Elementary Education, Changsha Normal University, South Campus, No. 9, Xingshateli Road, Changsha 410100, ChinaSchool of Elementary Education, Changsha Normal University, South Campus, No. 9, Xingshateli Road, Changsha 410100, ChinaSchool of Elementary Education, Changsha Normal University, South Campus, No. 9, Xingshateli Road, Changsha 410100, ChinaDeveloping a rapid and reliable method for measuring the photoreactivity of TiO<sub>2</sub> pigments is of great importance for industrial application. The photoactivity of industrial TiO<sub>2</sub> pigments were evaluated via the photodegradation of a model azo dye, methyl orange (MO), in the present work. The TiO<sub>2</sub> pigments were characterized by Fourier-transform infrared spectroscopy (FTIR), ultraviolet–visible (UV–vis) spectroscopy, scanning electron microscopy (SEM), and photoluminescence (PL) spectroscopy. The photoactivity test results showed that the anatase TiO<sub>2</sub> pigment was responsible for accelerating MO degradation, while the rutile pigment acted as a stabilizer, and effective UV absorber retarded the photodegradation of MO. It was found that the photodegradation of MO was driven mainly by photoholes (h<sup>+</sup>) and hydroxyl radicals (•OH), in the presence of TiO<sub>2</sub> pigment with high photoactivity. With the help of the degradation intermediates during the photodegradation process and the calculated data, the preliminary degradation mechanism including azo bond cleaving, h<sup>+</sup> oxidation, and hydroxylated products’ generation for MO was also elucidated. The photoactivity of TiO<sub>2</sub> pigments can be rapidly evaluated in this work, which would be an efficient approach for assessing the product quality control and the end-use performance of TiO<sub>2</sub> pigments.https://www.mdpi.com/1996-1944/15/17/6044titanium dioxide pigmentmethyl orangephotoactivityphotodegradationmechanism |
| spellingShingle | Shuolin Zhou Junzhuo Bai Keying Huang Xinlu Ye Yingqing Peng Min Lei Consideration of Photoactivity of TiO<sub>2</sub> Pigments via the Photodegration of Methyl Orange under UV Irradiation Materials titanium dioxide pigment methyl orange photoactivity photodegradation mechanism |
| title | Consideration of Photoactivity of TiO<sub>2</sub> Pigments via the Photodegration of Methyl Orange under UV Irradiation |
| title_full | Consideration of Photoactivity of TiO<sub>2</sub> Pigments via the Photodegration of Methyl Orange under UV Irradiation |
| title_fullStr | Consideration of Photoactivity of TiO<sub>2</sub> Pigments via the Photodegration of Methyl Orange under UV Irradiation |
| title_full_unstemmed | Consideration of Photoactivity of TiO<sub>2</sub> Pigments via the Photodegration of Methyl Orange under UV Irradiation |
| title_short | Consideration of Photoactivity of TiO<sub>2</sub> Pigments via the Photodegration of Methyl Orange under UV Irradiation |
| title_sort | consideration of photoactivity of tio sub 2 sub pigments via the photodegration of methyl orange under uv irradiation |
| topic | titanium dioxide pigment methyl orange photoactivity photodegradation mechanism |
| url | https://www.mdpi.com/1996-1944/15/17/6044 |
| work_keys_str_mv | AT shuolinzhou considerationofphotoactivityoftiosub2subpigmentsviathephotodegrationofmethylorangeunderuvirradiation AT junzhuobai considerationofphotoactivityoftiosub2subpigmentsviathephotodegrationofmethylorangeunderuvirradiation AT keyinghuang considerationofphotoactivityoftiosub2subpigmentsviathephotodegrationofmethylorangeunderuvirradiation AT xinluye considerationofphotoactivityoftiosub2subpigmentsviathephotodegrationofmethylorangeunderuvirradiation AT yingqingpeng considerationofphotoactivityoftiosub2subpigmentsviathephotodegrationofmethylorangeunderuvirradiation AT minlei considerationofphotoactivityoftiosub2subpigmentsviathephotodegrationofmethylorangeunderuvirradiation |