Synthesis, Characterization and Sonocatalytic Activity of Co/N/Er<sup>3+</sup> : Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub> /TiO2 Film for the Degradation of Organic Dyes
The sonocatalytic degradation of organic dyes (C.I. 50040, C.I. Reactive Red 1, C.I. Acid Orange 7) catalysed by Co/N/Er<sup>3+</sup> : Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>/TiO<sub>2</sub> films was studied. For the preparation of Co/N...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Croatian Society of Chemical Engineers
2015-07-01
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| Series: | Kemija u Industriji |
| Subjects: | |
| Online Access: | http://pierre.fkit.hr/hdki/kui/vol64/broj7-8/339.pdf |
| Summary: | The sonocatalytic degradation of organic dyes (C.I. 50040, C.I. Reactive Red 1, C.I. Acid Orange 7) catalysed by Co/N/Er<sup>3+</sup> : Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>/TiO<sub>2</sub> films was studied. For the preparation of Co/N/Er<sup>3+</sup> : Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>/TiO<sub>2</sub> films, the sol-gel coating process was used. The phase composition, morphology, precursor at different temperatures and emitting light properties of the calcined powders were analysed by X-ray diffraction (XRD), absorption spectra and upconversion emission spectra. The X-ray diffraction of powder samples of Co/N/Er<sup>3+</sup> : Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>/TiO<sub>2</sub> took on anatase mine peaks and upconversion luminous agent, respectively. Analysis of absorption spectra of amorphous Co/N/Er<sup>3</sup>+ : Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>/TiO<sub>2</sub> showed that doping N stretching vibration peak of water or hydroxyl adsorption, Co<sup>2+</sup> ion had very strong absorption in 1.0–1.7 μm wavelength range, the transition luminescence of Er<sup>3+</sup> ions was just on Co<sup>2+</sup> ions absorption band. The emission spectrum indicated that Co/N/Er<sup>3+</sup> : Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>/TiO<sub>2</sub> could launch green 500–560 nm and red 650–700 nm, 525, 550 and 660 nm peaks corresponding to 2H11/2, 4S3/2 → 4I15/2 and 4H9/2 → 4I15/2 transition of Er<sup>3+</sup>. Doping Co and N enhanced the upconversion luminescence and absorption effect. Sonocatalytic degradation effect of organic dyes loading Co/N/Er<sup>3+</sup> : Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>/TiO<sub>2</sub> was better when ultrasonic intensity was equal to 15 W cm<sup>–2</sup>. The degradation ratios of aqueous solutions of these three kinds of organic dyes by ultrasonic irradiation were obviously lower than by ultrasonic irradiation together with Co/N/Er<sup>3+</sup> : Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>/TiO<sub>2</sub> films in the same conditions. Degradation kinetics of organic dyes by ultrasonic irradiation and by ultrasonic irradiation cooperating with Co/N/Er<sup>3+</sup> : Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>/TiO<sub>2</sub> films followed the first-order reaction. |
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| ISSN: | 0022-9830 1334-9090 |