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Photoreduction of Copper Ions Using Silica–Surfactant Hybrid and Titanium (IV) Oxide under Sulfuric Acid Conditions
| Content Provider | MDPI |
|---|---|
| Author | Machida, Shingo Kato, Reo Hasegawa, Kaishi Gotoh, Takahiro Katsumata, Ken-Ichi Yasumori, Atsuo |
| Copyright Year | 2022 |
| Description | Photoreduction of $Cu^{2+}$ ions to Cu metal by titanium(IV) oxide $(TiO_{2}$) was conducted in the presence of a silica–surfactant hybrid under sulfuric acid conditions. After irradiation, a dark-red color, reflections due to Cu metal in the X-ray diffraction pattern, and peaks due to Cu $2p_{1/2}$ and $2p_{3/2}$ in the X-ray photoelectron spectrum indicated the precipitation of Cu metal in the product. In addition, an increase in the Brunauer–Emmett–Teller specific surface area from 36 and 45 $m^{2}$/g for the silica–surfactant and $TiO_{2}$, respectively, to 591 $m^{2}$/g for the product, and a decrease in the intensity of the C-H stretching band in the Fourier–transform infra-red spectra implied the removal of surfactant during the reaction. These characteristics were never observed when $TiO_{2}$ was used solely. Therefore, this study indicated that the photoreduction of $Cu^{2+}$ ions to Cu metal by $TiO_{2}$ was facilitated under the sulfuric acid medium, where the surfactants extracted from silica–surfactant hybrids by protons in the acidic condition were successfully photo-oxidized by $TiO_{2}$. Thus, this study presents a new application of the conversion of a silica–surfactant hybrid into mesoporous silicas. |
| Starting Page | 5132 |
| e-ISSN | 19961944 |
| DOI | 10.3390/ma15155132 |
| Journal | Materials |
| Issue Number | 15 |
| Volume Number | 15 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-07-24 |
| Access Restriction | Open |
| Subject Keyword | Materials Spectroscopy Mesoporous Silica Silica–surfactant Hybrid Heavy Metal Ion Photoreduction Titanium Oxide |
| Content Type | Text |
| Resource Type | Article |
