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Artificial Solar Light-Driven $APTES/TiO_{2}$ Photocatalysts for Methylene Blue Removal from Water
| Content Provider | MDPI |
|---|---|
| Author | Sienkiewicz, Agnieszka Rokicka-Konieczna, Paulina Wanag, Agnieszka Kusiak-Nejman, Ewelina Morawski, Antoni W. |
| Copyright Year | 2022 |
| Description | A visible-light photocatalytic performance of 3-aminopropyltriethoxysilane (APTES)-modified $TiO_{2}$ nanomaterials obtained by solvothermal modification under elevated pressure, followed by calcination in an argon atmosphere at 800–1000 °C, is presented for the first time. The presence of silicon and carbon in the $APTES/TiO_{2}$ photocatalysts contributed to the effective delay of the anatase-to-rutile phase transformation and the growth of the crystallites size of both polymorphous forms of $TiO_{2}$ during heating. Thus, the calcined APTES-modified $TiO_{2}$ exhibited higher pore volume and specific surface area compared with the reference materials. The change of $TiO_{2}$ surface charge from positive to negative after the heat treatment increased the adsorption of the methylene blue compound. Consequently, due to the blocking of active sites on the $TiO_{2}$ surface, the adsorption process negatively affected the photocatalytic properties. All calcined photocatalysts obtained after modification via APTES showed a higher dye decomposition degree than the reference samples. For all 3 modifier concentrations tested, the best photoactivity was noted for nanomaterials calcined at 900 °C due to a higher specific surface area than materials calcined at 1000 °C, and a larger number of active sites available on the $TiO_{2}$ surface compared with samples annealed at 800 °C. It was found that the optimum concentration for $TiO_{2}$ modification, at which the highest dye decomposition degree was noted, was 500 mM. |
| Starting Page | 947 |
| e-ISSN | 14203049 |
| DOI | 10.3390/molecules27030947 |
| Journal | Molecules |
| Issue Number | 3 |
| Volume Number | 27 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-01-30 |
| Access Restriction | Open |
| Subject Keyword | Molecules Environmental Engineering Environmental Sciences Photocatalytic Water Treatment Titanium Dioxide Aptes Artificial Solar Light Methylene Blue Decomposition |
| Content Type | Text |
| Resource Type | Article |
