Synthesis and Characterization of ZnO Nanorods and ...
ZnO nanorods and nanodisks were synthesized by solution process using zinc chloride as starting material. The morphology of ZnO crystal changed greatly depending on the concentrations of Zn2+ion and ethylene glycohol (EG) additive in the solution. The effect of thermal treatment on the morphology was investigated. Photocatalytic activities of plate-like Zn5(OH)8Cl2 · H2O and rod-like …
Water | Free Full-Text | Solvothermal Synthesis of ZnO ...
The photocatalytic degradation of organic pollutants is an effective method of controlling environmental pollution. ZnO nanoparticles (ZnO NPs) were prepared by the solvothermal method and characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV–visible diffuse reflectance spectroscopy ...
Impact of ZnO addition on structural, morphological ...
12%BaTiO3/(ZnO)x ceramics (x = 0, 2, 5 and 10 wt%) were produced via solid state reaction by using high energy ball milling. The morphological, structural, spectral, optical, electrical and dielectric properties were systematically investigated. X-ray diffraction indicated that all ceramics crystallize in the tetragonal structure. The grains size increases with ZnO additions. The …
Photocatalytic degradation of methylene blue by C3N4/ZnO ...
The C 3 N 4 /ZnO composite photocatalysts were synthesized by mechanical milling combined with a calcination process. Various ratios of melamine and ZnO powders were milled by a planetary ball mill for 10 h. After heating at 540 ∘ C for 3 h in air, melamine was converted to C 3 N 4 but the formation of C 3 N 4 depended on the ratios of the melamine and ZnO (M/Z) powders.
Methylene Blue Photodegradation under Visible Irradiation ...
Figure 7(a) shows the diffuse reflectance spectrum for both the ZnO and the Ag-doped ZnO thin films. The results show that the ZnO thin films had a high reflectance of approximately 70% after 370 nm. The results show that the ZnO thin films had a …
Preparation, characterization and activity evaluation of p ...
In this paper, p-type ZnO powder was prepared by decomposition of zinc nitrate at 350 °C for 1 h. p-n junction photocatalyst p-ZnO/TiO 2 was prepared by ball milling of TiO 2 in H 2 O solution doped with p-ZnO. The p-n junction photocatalyst p-ZnO/TiO 2 was characterized by UV-vis diffuse reflection spectrum, scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and the ...
Study on the Heterojunction Photocatalyst Nb2WO8/ZnO ...
Orthorhombic Nb2WO8 was synthesized by solid state reaction in Nb2O5-WO3 system. Heterojunction photocatalyst Nb2WO8/ZnO was prepared by ball milling. The structural and optical properties of the photocatalyst were characterized by X-ray powder diffraction, transmission electron microscopy, UV–vis diffuse reflectance spectroscopy, and fluorescence emission spectroscopy.The photocatalytic ...
Properties of mechanochemically synthesised N-doped Fe O ...
Diffuse reflectance spectra 2 UV-vis diffuse reflectance spectra are shown in Fig. 2. A pure ZnO sample could absorb only ultra-violet light. A spectrum of N-doped Fe 2 O 3-ZnO sample demonstrated a reflectance, covering wave-lengths from 200 to 800 nm. A decrease of the reflectance was observed for doped mixed oxide
Increased photocatalytic activity of NiO and ZnO in ...
DRS spectra (diffuse reflectance spectra) of some supported NiO and ZnO semiconductors onto NC were obtained by the following Kubelka-Munk . K = (1-R) 2 /2R In this equation, K is the reflectance transformed and R is the reflectance (%).
Facile and scalable production of heterostructured ZnS-ZnO ...
The UV-visible diffuse reflectance converted absorbance spectrum was recorded to evaluate the optical properties of the resultant Z2G nanohybrids …
Comparison on photocatalytic degradation of gaseous ...
The UV–vis diffuse reflectance spectra of TiO 2 and ZnO samples are displayed in Fig. 4. The TiO 2 and ZnO samples exhibit two absorptions below 400 nm and 387 nm, which correspond to their absorption edges (E g = 3.1 eV for TiO 2 and E g = 3.2 eV for ZnO), respectively.
Simultaneous enhancement of natural sunlight- and ...
Mechanical milling of commercial ZnO and SnO2 was used to produce a ZnO/SnO2 composite with a high density of surface defects; in particular, zinc interstitials (Zni) and oxygen vacancies (VO). To determine the impact of surface defects on photocatalytic activity, the relative concentration ratio of bulk defects to surface defects was modified ...
Processes of microstructural evolution during high-energy ...
Kinetics of microstructural evolution in ZnO and NiO black powder mixture during prolonged high-energy mechanical ball milling were investigated by Scanning Electron Microscopy, Laser Particle Sizer, X-ray diffraction, Electron Paramagnetic Resonance, Fourier Transform Infrared Spectroscopy and UV-vis Diffuse Reflection methods. The use of these methods allows us to control the macrostructural ...
The facile preparation of Ag decorated TiO2/ZnO nanotubes ...
Upon blending ZnO into TiO 2, a new crystallite ZnTiO 3 was formed in addition to the ZnO and TiO 2 crystallites, and the ultra-violet light absorption efficiency was detected using UV-vis diffuse reflectance spectroscopy (DRS). The photocatalytic properties were evaluated using the degradation of methyl orange (MO) dye.
A novel green approach based on ZnO nanoparticles and ...
Novel green photocatalysts based on ZnO in the presence of arabic gum (AGZ) or karaya gum (KGZ) were synthesized by a sol-gel method for photocatalytic performance. The materials were characterized by XRD, FTIR spectroscopy, SEM, nitrogen adsorption/desorption, and PL and …
UV–vis diffuse reflectance spectra of pure ZnO and ZnO:Co ...
Download scientific diagram | UV–vis diffuse reflectance spectra of pure ZnO and ZnO:Co nanorods from publication: A high performance cobalt-doped ZnO visible light photocatalyst and its ...
Synthesis, characterization and photocatalytic activity of ...
Zinc oxide have been produced via a simple green method from zinc nitrate and leaf extract aqueous solutions. Prepared ZnO nanoparticles (NPs) were investigated by employing through UV-Visible diffuse reflectance spectroscopy (UV-DRS), photoluminescence (PL) spectroscopy, X-ray diffraction (XRD), Fourier transform infrared (FTIR), field emission-scanning electron microscope (FE-SEM), and ...
Structural and Diffuse Reflectance Study of Cr-Doped ZnO ...
12%The obtained results referred to ZnO wurtzite hexagonal structure in absence of other ZnO phases or any phases based on chromium. The obtained particles of the investigated samples are uniform rod-like shape with average diameter about 50 nm. The diffuse reflectance measurements exhibited the decrease in NIR reflectance with increasing Cr content.
In Situ g-C3N4@Zno Nanocomposite: One-Pot Hydrothermal ...
In situ g-C 3 N 4 @ZnO nanocomposites (with 0, 1, 3, 5, and 7 wt.% of g-C 3 N 4 in nanocomposite) were synthesized via a one-pot hydrothermal method using precursors of urea, zinc nitrate hexahydrate, and hexamethylenetetramine. The g-C 3 N 4 @ZnO nanocomposites were characterized by X-ray diffraction, scanning electron microscope, diffuse reflectance spectroscopy, …
Preparation, characterization and activity evaluation of p ...
In this paper, p-type ZnO powder was prepared by decomposition of zinc nitrate at 350 °C for 1 h. p–n junction photocatalyst p-ZnO/TiO 2 was prepared by ball milling of TiO 2 in H 2 O solution doped with p-ZnO. The p–n junction photocatalyst p-ZnO/TiO 2 was characterized by UV–vis diffuse reflection spectrum, scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and the ...
(PDF) Phase development during high-energy ball-milling of ...
High-energy ball-milling of powder mixtures of zincite (ZnO) and iron (alpha-Fe) at different weight ratios was performed in air using a planetary ball mill with a stainless steel milling assembly.
Preparation, characterization and activity evaluation of p ...
In this paper, p-type ZnO powder was prepared by decomposition of zinc nitrate at 350 °C for 1 h. p–n junction photocatalyst p-ZnO/TiO2 was prepared by ball milling of TiO2 in H2O solution ...
Preparation, characterization and activity evaluation of p ...
UV–vis diffuse reflection spectra: (a) ball milling time 3 h, (b) ball milling time 6 h, and (c) ball milling time 12 h. In the process of ball milling, the crystal lattices of the CaFe 2 O 4 and ZnO undergo severe plastic deformation, producing stresses and strains.
Standard JCPDS pattern for ZnO (file no: 043-0002) and XRD ...
The reflectance in the ordinate axis of the reflectance spectrum is transformed into Kubelka Munk function (F(R) = (1-R 2 )/2R), Rodwihok et al., 2020, which is equivalent to the absorption ...
Morphology engineering of ZnO nanorod arrays to ...
The TEM images of ZnO-3, ZnO-3a, ZnO-4 and ZnO-4a confirm the formation of rods with a d-spacing of 0.26 to 0.29 nm. The evolution of the flower-like morphology with different growth times (6, 12, 18 and 24 hours) has been discussed based on the different crystallographic habits of wurtzite hexagonal ZnO.
Applications of Metal/Mixed Metal Oxides as Photocatalyst ...
for 1 h. p-n junction photocatalyst p-ZnO/TiO 2 was prepared by ball milling of TiO 2 in H 2 O solution doped with p-ZnO. The p-n junction photocatalyst p-ZnO/ TiO 2 was characterized by UV-Vis diffuse reflection spectrum, scanning electron microscopy (SEM). Namely, the p-n junction photocatalyst p-ZnO/TiO 2 has higher photocatalytic reduction ...
Enhanced Photocatalytic Activity of BiOBr/ZnO ...
3.3. UV-Vis Diffuse Reflection Spectra (DRS) The optical properties of pure ZnO and BiOBr-ZnO composites were performed by UV-Vis diffuse reflection spectra (DRS), which were shown in Figure 5. A sharp decrease existed with increasing irradiation wavelengths greater than a specific value in both of them, which resulted from the band-gap transition.
Modification of TiO2 and ZnO Particles Under Mechanical ...
Abstract. Solid-state process of introducing oxygen vacancies into the structure of TiO 2 and ZnO particles was studied. The phase transformations of metal oxides throughout the process were examined by X-ray diffraction (XRD). The influence of the loaded mechanical stress on the band gap was studied by diffuse reflectance spectroscopy (DRS).
SERBIATRIB '13
ZnO:Fe2O3 = 1:1 before milling. All the diffraction peaks of mechanical activated zinc oxide and 0.3 FZ sample can be well indexed to the hexagonal phase ZnO (JCPDS card no. 36-1451. A decrease in the reflection intensity was observed during milling. As milling proceeds broadening of diffraction peaks is observed due to grain size reduction ...
Enhanced photocatalytic properties of ZnO/Al2O3 nanorod ...
The UV–vis diffuse reflectance spectrum for the synthesized ZnO/Al 2 O 3 heterostructure is presented in figure 5(a). For comparison, the spectra of pure ZnO nanorod arrays is also plotted. Figure 5(b) is the curve of (F(R)*hν) 2 versus photon energy based on the Kubelka-Munk theory, where F(R) = (1−R) 2 /(2 R and R is the diffused ...