Comparison of Photocatalytic Activities of Anatase and Rutile Titania Nanostructures Synthesized by Microwave Irradiation

2013 ◽  
Vol 1 (6) ◽  
pp. 65 ◽  
Author(s):  
Haizel G. Roy
Keyword(s):  
Microwave Irradiation ◽  
Photocatalytic Activities ◽  
Titania Nanostructures ◽  
Rutile Titania

Microwave-Assisted Synthesis of a Series of Ag/ZnO Nanocomposites and Evaluation of Their Photocatalytic Activities under Multi-Mode Photodegradation

2015 ◽  
Vol 68 (5) ◽  
pp. 774 ◽  
Author(s):  
Li Li ◽  
Xiandan Huang ◽  
Yu Gao ◽  
Wenzhi Zhang ◽  
Xiuli Zhang ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Diffuse Reflectance Spectroscopy ◽  
Nitrogen Adsorption ◽  
Microwave Assisted Synthesis ◽  
X Ray Diffraction ◽  
Surface Areas ◽  
Photocatalytic Activities ◽  
Surface Physicochemical Properties ◽  
Adsorption Desorption ◽  
Multi Mode

A series of Ag/ZnO nanocomposites were prepared under microwave irradiation of different powers (100, 200, and 300 W). The crystal structure, morphology, and surface physicochemical properties of the as-synthesized samples were characterized by X-ray diffraction, UV–visible diffuse reflectance spectroscopy, scanning electron microscopy, and nitrogen adsorption–desorption analyses. Compared with the Ag/ZnO prepared by conventional sedimentation process, the crystal structures of Ag and ZnO did not exhibit any transformation after microwave irradiation; however, slight increases or decreases were observed in their absorption spectra and the specific surface areas. Moreover, the morphologies of all Ag/ZnO samples were changed dramatically by microwave irradiation, showing morphologies such as octagonal nano-pyramidal and multi-angled nano-pyramidal. The multi-mode photocatalytic degradation studies showed that the photocatalytic activities of the Ag/ZnO nanocomposites prepared under microwave irradiation of different powers were enhanced to different extents and were much higher than that of P25, ZnO, and Ag/ZnO prepared in the absence of microwave irradiation.

Maintaining particle size in the transformation of anatase to rutile titania nanostructures

2008 ◽  
Vol 69 (11) ◽  
pp. 2898-2906 ◽  
Author(s):  
Andrew Ogden ◽  
James A. Corno ◽  
Jung-Il Hong ◽  
Andrei Fedorov ◽  
James L. Gole
Keyword(s):  
Particle Size ◽  
Titania Nanostructures ◽  
Rutile Titania

Synthesis of ZnO/ZnFe2O4 nanocomposites in organic-free media and their photocatalytic activity under natural sunlight

2020 ◽  
Vol 14 (2) ◽  
pp. 6801-6810
Author(s):  
Rahmayeni Rahmayeni ◽  
Zulhadjri Zulhadjri ◽  
Yeni Stiadi ◽  
Agusnar Harry ◽  
Syukri Arief
Keyword(s):  
Electron Microscopy ◽  
Hexagonal Wurtzite Structure ◽  
Rice Grain ◽  
X Ray Diffraction ◽  
Homogeneous Sphere ◽  
Natural Sunlight ◽  
Transmission Electron ◽  
Photocatalytic Activities ◽  
Free Media ◽  
Photocatalytic Applications

Nanocomposite ZnO/ZnFe2O4 photocatalysts with different proportions of ZnFe2O4 were synthesized in organic-free media using metal nitric as precursors. The ZnO phase with hexagonal wurtzite structure and low crystallinity of ZnFe2O4 was confirmed using XRD (X-Ray diffraction). Different morphologies of the nanocomposites were obtained ranging from rice grain-like with a porous surface to homogeneous sphere-like nanoparticles as shown in Scanning Electron Microscopy (SEM) and TEM Transmission Electron Microscopy (TEM) studies. Magnetic properties measured by Visible Sampler Magnetometer (VSM) showed diamagnetic and paramagnetic behavior for the nanocomposites. Analysis with Diffuse Reflectance Spectrophotometer (DRS) UV-vis showed an increase the composition of ferrite in composites increasing its ability to absorb visible light. Photocatalytic activities of ZnO/ZnFe2O4 nanocomposites on the degradation of Rhodamine B dye reached 95.6% after 3 h under natural sunlight suggesting their suitability for sunlight driven photocatalytic applications. 

Eco-Friendly Synthesis of Pyrazoline Derivatives

2017 ◽  
Vol 9 (04) ◽  
Author(s):  
Mahesh G. Kharatmol ◽  
Deepali Jagdale
Keyword(s):  
Ionic Liquids ◽  
Microwave Irradiation ◽  
Organic Synthesis ◽  
Ultrasonic Irradiation ◽  
Minimal Energy ◽  
Anticancer Activities ◽  
Conventional Methods

Pyrazoline class of compounds serve as better moieties for an array of treatments, they have antibacterial, antifungal, antiinflammatory, antipyretic, diuretic, cardiovascular activities. Apart from these they also have anticancer activities. So, pertaining to its importance, many attempts are made to synthesize pyrazolines. Since conventional methods of organic synthesis are energy and time consuming. There are elaborate pathways for green and eco-friendly synthesis of pyrazoline derivatives including microwave irradiation, ultrasonic irradiation, grinding and use of ionic liquids which assures the synthesis of the same within much lesser time and by use of minimal energy

Preparation and Photocatalytic Activities of Y3+ or Nd3+-doped TiO2 Nanofibres

2010 ◽  
Vol 25 (4) ◽  
pp. 379-385 ◽  
Author(s):  
Jin-Xian WANG ◽  
Yue-Qiu GUO ◽  
Xiang-Ting DONG ◽  
Zhi-Guo LI ◽  
Gui-Xia LIU
Keyword(s):  
Photocatalytic Activities
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