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Photocatalytic Reduction of $CO_{2}$ with N-Doped $TiO_{2}$-Based Photocatalysts Obtained in One-Pot Supercritical Synthesis
| Content Provider | MDPI |
|---|---|
| Author | Ver, ónica Rodríguez Fabiola, Martínez Carlos, Jiménez Jesusa, Rincón Andrade, Óscar R. Camarillo, Rafael |
| Copyright Year | 2022 |
| Description | The objective of this work was to analyze the effect of carbon support on the activity and selectivity of N-doped $TiO_{2}$ nanoparticles. Thus, N-doped $TiO_{2}$ and two types of composites, N-doped $TiO_{2}$/CNT and N-doped $TiO_{2}$/rGO, were prepared by a new environmentally friendly one-pot method. CNT and rGO were used as supports, triethylamine and urea as N doping agents, and titanium (IV) tetraisopropoxide and ethanol as Ti precursor and hydrolysis agent, respectively. The as-prepared photocatalysts exhibited enhanced photocatalytic performance compared to $TiO_{2}$ P25 commercial catalyst during the photoreduction of $CO_{2}$ with water vapor. It was imputed to the synergistic effect of N doping (reduction of semiconductor band gap energy) and carbon support (enlarging $e^{−}-h^{+}$ recombination time). The activity and selectivity of catalysts varied depending on the investigated material. Thus, whereas N-doped $TiO_{2}$ nanoparticles led to a gaseous mixture, where $CH_{4}$ formed the majority compared to CO, N-doped $TiO_{2}$/CNT and N-doped $TiO_{2}$/rGO composites almost exclusively generated CO. Regarding the activity of the catalysts, the highest production rates of CO (8 $µmol/gTiO_{2}$/h) and $CH_{4}$ (4 $µmol/gTiO_{2}$/h) were achieved with composite N^{1}$/TiO_{2}$/rGO and N^{1}$/TiO_{2}$ nanoparticles, respectively, where superscript represents the ratio mg N/g $TiO_{2}$. These rates are four times and almost forty times higher than the CO and $CH_{4}$ production rates observed with commercial $TiO_{2}$ P25. |
| Starting Page | 1793 |
| e-ISSN | 20794991 |
| DOI | 10.3390/nano12111793 |
| Journal | Nanomaterials |
| Issue Number | 11 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-05-24 |
| Access Restriction | Open |
| Subject Keyword | Nanomaterials Applied Chemistry Titania Nitrogen Doping Carbon Nanotubes Reduced Graphene Oxide Carbon Dioxide Conversion |
| Content Type | Text |
| Resource Type | Article |
