Preparation of tetrapod‐like ZnO/TiO₂ core‐shell nanostructures as photocatalytic powder

Abstract

The coupling of zinc oxide tetrapods (t-ZnO) with anatase TiO 2 in the form of CVD coatings on ZnO nanotetrapods was investigated. t-ZnO/TiO 2 core-shell structures, consisting of uniformly and completely TiO 2 covered ZnO nanotetrapods, were characterized by scanning electron microscopy, X-ray diffraction and UV-Vis spectra. Photocatalytic activity, determined by degradation of a sodium methyl red solution, was found to be comparable to pure t-ZnO, while improved separation easiness was verified that makes the presented powders promising for wastewater treatment.

Complex ZnO-TiO2 Core–Shell Flower-Like Architectures with Enhanced Photocatalytic Performance and Superhydrophilicity without UV Irradiation

“…For example, immobilized brushlike ZnO-TiO 2 core−shell structures (250 ppm), required more than 300 min UV irradiation (254 nm) to completely remove 10 ppm of Bromo-Pyrogallol Red dye. 52 Similarly, 500 ppm of dispersed ZnO-TiO 2 core−shell tetrapods exhibited only a ∼ 20% decoloration of a 50 ppm of Sodium Methyl Red dye solution after 60 min irradiation (at 254 nm), 53 while ZnO/TiO 2 core−shell fibers (∼330 ppm) removed less than 10% of a ∼ 3.3 ppm Methyl Orange solution after 60 min of UV irradiation. 54 It is noted at this point that the most photoactive core−shell sample (sample ZT2) does not possess the highest surface area (see Table 2).…”

Ab initio study of electronic effects in the ZnO/TiO2core/shell interface: application in dye sensitized solar cells

“…ZnO/TiO 2 core shell structures have been used as DSSC working electrode in different morphologies including nanowires and nanoparticles, also in ultraviolet detectors and photocatalysis. [14][15][16][17][18] In ZnO nanowire/TiO 2 core/shell based DSSCs a small decrease in J sc and an increase in FF and V oc of the cell have been reported. 5,14 There are ab initio studies of DSSC semiconductor electronic states and their contribution to the cell performance.…”

CdS-sensitized ZnO nanorod arrays coated with TiO2 layer for visible light photoelectrocatalysis

“…One of the approaches is to introduce the composite system by incorporating a narrow band gap semiconductor (such as CdS [7][8][9], PbS [10], CdSe [11], and CdTe [12]) serving as the sensitizer. The system, for example TiO 2 /CdS [12][13][14][15], TiO 2 /PbS [16], TiO 2 /CdSe [17], and TiO 2 /ZnO [18][19][20][21][22], has been reported in the quantum-dot-sensitized solar cells and photocatalytic splitting of water. A growing attention has been drawn to the expansive application on environmental purification.…”