scholarly journals Simple Preparation of Ceramic-Like Materials Based on 1D-Agx(x=0, 5, 10, 20, 40 mM)/TiO2 Nanostructures and Their Photocatalysis Performance

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1024
Author(s):  
Noura Al Suliman ◽  
Chawki Awada ◽  
Adil Alshoaibi ◽  
Nagih M. Shaalan

Vertical Agx/TiO2 nanorods were successfully grown by a simple oxidation method of a Ti-Ag coating. The samples were grown in the phase of ceramic-like materials, which can be reusable for many cycles for photocatalysis applications. These ceramic-like Agx/TiO2 nanostructures were prepared by the spin-coating of silver nitrate onto Ti sheets. The presence of silver on the surface of the Ti sheet during the oxidation process helped in the growth of one-dimensional nanostructures. The physical properties of the fabricated ceramic-like nanostructures were studied by varying the concentration of silver on the Ti-sheet before the oxidation. One-dimensional nanostructures with an average size varying within the range of 200–500 nm were grown. The presence of silver made the nanostructure vertically directed. The nanorods were dense at the low and medium concentrations of 5, 10, and 20 mM of silver in contrary to high silver concentrations, where the nanorods were very sparse at 40 mM. Structural analysis showed the anatase and rutile structure of pure TiO2 with distinguishing diffraction lines A(101) and R(110); however, Agx/TiO2 showed a dominant orientation of A(101), confirming the 1D growth. Raman spectra confirmed the presence of TiO2 via the observation of its corresponding phonon modes. The photocatalysis properties of the fabricated ceramic-like nanostructures were performed on methylene blue (MB) as a known target dye. The low- and medium-silver-concentration samples showed a high photocatalytic activity compared to the pure and high-silver-concentration samples.

2013 ◽  
Vol 850-851 ◽  
pp. 78-81 ◽  
Author(s):  
Peng Guo ◽  
Ling Tao Meng ◽  
Chang Hua Wang

Heterojunction photocatalyst containing one dimensional nanostructures exhibits interesting size, shape and material-dependent photocatalytic properties compared to single-component counterpart. In this work, we develop a simple two-step strategy to WO3/TiO2 heterojunction based on WO3 nanorods and TiO2 nanoparticles. The as-obtained heterojunction features core-shell morphology and has the advantage of extended solar light response, enhanced chemical stability and easy recyclability. As such, it exhibits high photocatalytic activity toward organic pollutants degradation including rodamine B dye and gaseous acetaldehyde.


Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1234
Author(s):  
Petronela Pascariu ◽  
Corneliu Cojocaru ◽  
Anton Airinei ◽  
Niculae Olaru ◽  
Irina Rosca ◽  
...  

Ag–TiO2 nanostructures were prepared by electrospinning, followed by calcination at 400 °C, and their photocatalytic and antibacterial actions were studied. Morphological characterization revealed the presence of one-dimensional uniform Ag–TiO2 nanostructured nanofibers, with a diameter from 65 to 100 nm, depending on the Ag loading, composed of small crystals interconnected with each other. Structural characterization indicated that Ag was successfully integrated as small nanocrystals without affecting much of the TiO2 crystal lattice. Moreover, the presence of nano Ag was found to contribute to reducing the band gap energy, which enables the activation by the absorption of visible light, while, at the same time, it delays the electron–hole recombination. Tests of their photocatalytic activity in methylene blue, amaranth, Congo red and orange II degradation revealed an increase by more than 20% in color removal efficiency at an almost double rate for the case of 0.1% Ag–TiO2 nanofibers with respect to pure TiO2. Moreover, the minimum inhibitory concentration was found as low as 2.5 mg/mL for E. coli and 5 mg/mL against S. aureus for the 5% Ag–TiO2 nanofibers. In general, the Ag–TiO2 nanostructured nanofibers were found to exhibit excellent structure and physical properties and to be suitable for efficient photocatalytic and antibacterial uses. Therefore, these can be suitable for further integration in various important applications.


2015 ◽  
Vol 19 (6) ◽  
pp. 484-497 ◽  
Author(s):  
Chuang Han ◽  
Siqi Liu ◽  
Zi-Rong Tang ◽  
Yi-Jun Xu

2021 ◽  
pp. 108128652110134
Author(s):  
B. Zhang ◽  
X.H. Wang ◽  
L. Elmaimouni ◽  
J.G. Yu ◽  
X.M. Zhang

In one-dimensional hexagonal piezoelectric quasi-crystals, there exist the phonon–phason, electro–phonon, and electro–phason couplings. Therefore, the phonon–phason coupling and piezoelectric effects on axial guided wave characteristics in one-dimensional hexagonal functionally graded piezoelectric quasi-crystal (FGPQC) cylinders are investigated by utilizing the Legendre polynomial series method. The dispersion curves and cut-off frequencies are illustrated. Wave characteristics in three hollow cylinders with different quasi-periodic directions are comparatively studied. Some new wave phenomena are revealed: the phonon–phason coupling and piezoelectric effects on the longitudinal and torsional phonon modes ( N = 0) vary as the quasi-periodic direction changes; the phonon–phason coupling effect on flexural–torsional modes in the r-, z-FGPQC hollow cylinders, and on flexural–longitudinal modes in ϑ-FGPQC hollow cylinders increases as N increases. The corresponding results obtained in this work lay the theoretical foundation for the design and manufacture of piezoelectric transducers with high resolution and energy-conversion efficiency.


2014 ◽  
Vol 250 ◽  
pp. 148-156 ◽  
Author(s):  
Xiaomin Guo ◽  
Xiangting Dong ◽  
Jinxian Wang ◽  
Wensheng Yu ◽  
Guixia Liu

2010 ◽  
Vol 13 (7) ◽  
pp. B69 ◽  
Author(s):  
Christiane de Arruda Rodrigues ◽  
Norma R. de Tacconi ◽  
Wilaiwan Chanmanee ◽  
Krishnan Rajeshwar

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