Synthesis, Structure, and Photocatalytic Activity of TiO<sub>2</sub>-Montmorillonite Composites
In the present study, TiO<sub>2</sub>-montmorillonite (MMT) composites were synthesized hydrothermally under variable conditions, including the TiO<sub>2</sub>/MMT mass ratio, reaction pH, reaction temperature, and dwelling time. These samples were determined by X-ray photoel...
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MDPI AG
2022-04-01
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| Online Access: | https://www.mdpi.com/2073-4344/12/5/486 |
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| author | Yonghui Zhang Baoji Miao Qiuling Chen Zhiming Bai Yange Cao Basandorj Davaa |
| author_facet | Yonghui Zhang Baoji Miao Qiuling Chen Zhiming Bai Yange Cao Basandorj Davaa |
| author_sort | Yonghui Zhang |
| collection | DOAJ |
| description | In the present study, TiO<sub>2</sub>-montmorillonite (MMT) composites were synthesized hydrothermally under variable conditions, including the TiO<sub>2</sub>/MMT mass ratio, reaction pH, reaction temperature, and dwelling time. These samples were determined by X-ray photoelectron spectrometry (XPS), ultraviolet–visible spectroscopy% (UV-Vis DRS), electrochemical impedance spectroscopy (EIS), transient photocurrent responses, photoluminescence (PL) spectra, electron paramagnetic resonance (EPR), and N<sub>2</sub> adsorption–desorption isotherms. The photocatalytic activity was evaluated as the ability to promote the visible-light-driven degradation of 30 mg/L of aqueous methylene blue, which was maximized for the composite with a TiO<sub>2</sub> mass ratio of 30 wt% prepared at a pH of 6, a reaction temperature of 160 °C, and a dwelling time of 24 h (denoted as 30%-TM), which achieved a methylene blue removal efficiency of 95.6%, which was 4.9 times higher than that of pure TiO<sub>2</sub>. The unit cell volume and crystallite size of 30%-TM were 92.43 Å<sup>3</sup> and 9.28 nm, respectively, with a relatively uniform distribution of TiO<sub>2</sub> particles on the MMT’s surface. In addition, 30%-TM had a large specific surface area, a strong light absorption capacity, and a high Ti<sup>3+</sup> content among the studied catalysts. Thus, the present study provides a basis for the synthesis of composites with controlled structures. |
| first_indexed | 2024-03-10T03:11:38Z |
| format | Article |
| id | doaj.art-78b24d6dcb92401787dc0f5fce99bc2d |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-10T03:11:38Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
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| series | Catalysts |
| spelling | doaj.art-78b24d6dcb92401787dc0f5fce99bc2d2023-11-23T10:25:34ZengMDPI AGCatalysts2073-43442022-04-0112548610.3390/catal12050486Synthesis, Structure, and Photocatalytic Activity of TiO<sub>2</sub>-Montmorillonite CompositesYonghui Zhang0Baoji Miao1Qiuling Chen2Zhiming Bai3Yange Cao4Basandorj Davaa5Henan International Joint Laboratory of Nano-Photoelectric Magnetic Materials, Henan University of Technology, Zhengzhou 450001, ChinaHenan International Joint Laboratory of Nano-Photoelectric Magnetic Materials, Henan University of Technology, Zhengzhou 450001, ChinaHenan International Joint Laboratory of Nano-Photoelectric Magnetic Materials, Henan University of Technology, Zhengzhou 450001, ChinaAdvanced Ceramic Materials Technology Innovation Center, Hefei Innovation Research Institute of Beihang University, Hefei 230012, ChinaHenan International Joint Laboratory of Nano-Photoelectric Magnetic Materials, Henan University of Technology, Zhengzhou 450001, ChinaWater Research Center, Mongolian University of Science and Technology, Khoroo 8, Sukhbaatar District, Ulaanbaatar 14191, MongoliaIn the present study, TiO<sub>2</sub>-montmorillonite (MMT) composites were synthesized hydrothermally under variable conditions, including the TiO<sub>2</sub>/MMT mass ratio, reaction pH, reaction temperature, and dwelling time. These samples were determined by X-ray photoelectron spectrometry (XPS), ultraviolet–visible spectroscopy% (UV-Vis DRS), electrochemical impedance spectroscopy (EIS), transient photocurrent responses, photoluminescence (PL) spectra, electron paramagnetic resonance (EPR), and N<sub>2</sub> adsorption–desorption isotherms. The photocatalytic activity was evaluated as the ability to promote the visible-light-driven degradation of 30 mg/L of aqueous methylene blue, which was maximized for the composite with a TiO<sub>2</sub> mass ratio of 30 wt% prepared at a pH of 6, a reaction temperature of 160 °C, and a dwelling time of 24 h (denoted as 30%-TM), which achieved a methylene blue removal efficiency of 95.6%, which was 4.9 times higher than that of pure TiO<sub>2</sub>. The unit cell volume and crystallite size of 30%-TM were 92.43 Å<sup>3</sup> and 9.28 nm, respectively, with a relatively uniform distribution of TiO<sub>2</sub> particles on the MMT’s surface. In addition, 30%-TM had a large specific surface area, a strong light absorption capacity, and a high Ti<sup>3+</sup> content among the studied catalysts. Thus, the present study provides a basis for the synthesis of composites with controlled structures.https://www.mdpi.com/2073-4344/12/5/486hydrothermal synthesisTiO<sub>2</sub>-montmorillonitephotocatalysissynthetic conditions |
| spellingShingle | Yonghui Zhang Baoji Miao Qiuling Chen Zhiming Bai Yange Cao Basandorj Davaa Synthesis, Structure, and Photocatalytic Activity of TiO<sub>2</sub>-Montmorillonite Composites Catalysts hydrothermal synthesis TiO<sub>2</sub>-montmorillonite photocatalysis synthetic conditions |
| title | Synthesis, Structure, and Photocatalytic Activity of TiO<sub>2</sub>-Montmorillonite Composites |
| title_full | Synthesis, Structure, and Photocatalytic Activity of TiO<sub>2</sub>-Montmorillonite Composites |
| title_fullStr | Synthesis, Structure, and Photocatalytic Activity of TiO<sub>2</sub>-Montmorillonite Composites |
| title_full_unstemmed | Synthesis, Structure, and Photocatalytic Activity of TiO<sub>2</sub>-Montmorillonite Composites |
| title_short | Synthesis, Structure, and Photocatalytic Activity of TiO<sub>2</sub>-Montmorillonite Composites |
| title_sort | synthesis structure and photocatalytic activity of tio sub 2 sub montmorillonite composites |
| topic | hydrothermal synthesis TiO<sub>2</sub>-montmorillonite photocatalysis synthetic conditions |
| url | https://www.mdpi.com/2073-4344/12/5/486 |
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