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Abstract
A novel one-step preparation of sonochemical method was applied to synthesize Co/Zn co-doped TiO2 nanoparticles using a sonicator of 750 W, 20 kHz for 30 min at room temperature. The formation of the anatase TiO2 phase for all as-prepared samples was observed from XRD results with a crystalline size in nanoscale. The use of ultrasound allowed for the successful doping of both Co and Zn into the TiO2 lattice, which was confirmed by Synchrotron light including X-ray near edge structure (XANES) and Extended X-ray absorption fine structure (EXAFS) spectroscopy. Ti K-edge, Co K-edge, and Zn K-edge XANES spectra exhibited the dominating +4, +2, and +2 valence state of Ti, Co, and Zn in as-prepared samples, respectively. A detailed XANES and EXAFS data analysis give strong evidence that the Co/Zn dopants partially replace the Ti atom of the TiO2 host. The Co/Zn co-doping extends the light absorption of the host to the visible region and restricts the e+/h+ recombination. The photocatalytic activity of samples was tested for degradation of Rhodamine B dye solution under visible light irradiation. The as-synthesized of the co-doped catalyst was presented as highly efficient, with 2.5 and 5 times dye degradation compared with single-doped and bare TiO2.
Highlights
The development of photo-catalyst materials to inactivate pathogenic in aqueous media, degradation of hazardous materials, environmental cleanup, and the purification of pollution in water and air is a matter of growing interest [1]
We have reported the use of the sonochemical method to prepare nanomaterials at room temperature, such as Mn-Zn co-doped TiO2 nanoparticles [28], perovskite ZnTiO3 nanoparticles [29], and Co and Mn-doped ZnTiO3 nanoparticles [30]
Co/Zn co-doped TiO2 was successfully synthesized by a facile onestep sonochemical method at room temperature
Summary
The development of photo-catalyst materials to inactivate pathogenic in aqueous media, degradation of hazardous materials, environmental cleanup, and the purification of pollution in water and air is a matter of growing interest [1]. The use of visible light for driving the photocatalytic activity employing solar light is a great challenge. Of the semiconductor photocatalytic materials, titanium dioxide (TiO2) has been the most extensively premeditated and utilized in various applications due to high chemical stability, great oxidizing strength, cheapness, and environmental friendliness [2,3]. In order to enhance the visible light absorption and to slow down the e−/h+ recombination, one of the approaches is to dope with metal/nonmetal, such as Zn, Mn, Co, Fe, Ni, Cu, V, Cr, Mo, Ce, Zr, Au, Y, F, N, I [5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]
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