Preparation and Photocatalytic Properties of Ti_1−xZr_xO₂ Solid Solution

Abstract

A series of Ti 1-x Zr x O 2 materials were synthesized through a multistep sol-gel process. The structural characteristics were investigated using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman measurements. The experimental results showed that a solid solution could be obtained at low Zr/(Ti＋Zr) molar ratios (x ≤0.319). Raman measurements exhibited that the presence of zirconium in the solid solutions greatly retarded the amorphous-anatase and anatase-rutile transitions. The diffuse reflectance UV-Vis spectra revealed that the bandgap of the solid solution was enlarged gradually with the increment of incorporated zirconium content. The Ti 1-x Zr x O 2 solid solutions exhibited higher photocatalytic activity than pure TiO 2 for the degradation of 4-chlorophenol aqueous solution.

Photocatalytic Nanoparticulate ZrxTi1‐xO2 Coatings with Controlled Homogeneity of Elemental Composition

“…In general, one could expect the band gap variation in this binary oxide from well known 3.2 eV of anatase TiO 2 to 5.1 eV of ZrO 2 . This tendency has been confirmed in previous studies of these mixed oxide solids . Our spectral measurements presented in Figure showed no significant variation of the band gap energy of Zr x Ti 1‐x O 2 with the increase of x from 0 to 0.3, while a stronger increase of E g appeared at a higher Zr content x>0.4.…”

Kinetics for the Reaction between Potassium Ferricyanide and Cobalt Chloride in Aqueous Solution and Microemulsion

“…The value of ΔΑ is independent on the influence of the absorption and light scatting of cobalt-iron PBAs when the absorbance due to the absorption and scattering of PBAs at each of the three wavelengths is linear with the wavelength. [17][18][19][20][21][22] Thus proper choices of the setting absorption wavelengths are crucial, which are required to ensure that the absorbance of cobalt-iron PBAs due to the absorption and scattering in the wavelength range between λ 1 and λ 3 is linear with the wavelength and the values of ΔΑ for K 3 Fe(CN) 6 are sufficiently large. The values of λ 1 and λ 3 were carefully selected to be 410 nm and 440 nm respectively in our study.…”

“…Chow et al [5] reported spherical cobalt-iron PBAs nanoparticles in water-in-oil (w/o) microemulsions containing nonionic surfactants. Vaucher et al [6] obtained cobalt hexacyanoferrate nanoparticles which are well-defined and uniform in size within the range of (12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) nm in microemulsion containing anionic surfactant sodium bis(2-ethylhexy) sulfosuccinate (aerosol OT or AOT). Zhao and co-worker synthesized nanoscale cobalt-iron PBAs with shapes of hollow, cube, and sphere in w/o microemulsions containing nonionic surfactant polyoxyethylen tertocthlphenyl ether (Triton X-100) and cationic surfactant cetyltrimethyl ammonium bromide (CTAB).…”

“…Therefore, the corrections for these interferences in the investigation of the kinetics of the reaction by spectrophotometric method are required. The method of three-wavelength spectrophotometry has been effectively used to eliminate these interferences [17][18][19] and successfully used in the study of the chemical reactions in critical solutions. [20][21][22] In this paper, we use three-wavelength spectrophotometry method to study the kinetics of the reaction between K 3 Fe(CN) 6 and CoCl 2 in both aqueous solution and water/AOT/isooctane microemulsion with various molar ratios (ω) of water to AOT at a given AOT concentration, from which the second order rate constants are deduced and discussed.…”

Visible-light-driven photocatalytic performance of nitrogen-doped Ti1−xZrxO2 solid solution

“…It is well known that the photocatalytic activity of transition metal ion doped TiO 2 had a complex relationship with the dopant concentration, the d electronic configuration, the distribution of dopant, etc. [19][20][21][22]. Undoubtedly, the photocatalytic mechanism of co-doped samples would be more complicated and desire of further exploration.…”