SYNTHESIS, CHARACTERIZATION AND PHOTOCATALYTIC ACTIVITIES OF Ba2YbZrO5.5 NANOPARTICLES UNDER SOLAR IRRADIATION

NANO ◽  
2011 ◽  
Vol 06 (03) ◽  
pp. 279-286 ◽  
Author(s):  
V. RATHEESH KUMAR ◽  
V. S. PRASAD ◽  
P. R. S. WARIAR ◽  
J. KOSHY
Keyword(s):  
Combustion Process ◽  
Visible Spectrum ◽  
Single Step ◽  
Solar Irradiation ◽  
X Ray Diffraction ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Photocatalytic Activities ◽  
20 Nm ◽  
First Time

The complex perovskite Ba2YbZrO5.5 has been successfully synthesized as nanoparticles through a single step combustion process for the first time. The X-ray diffraction analysis revealed that the combustion product is phase-pure and has an ordered cubic perovskite structure. Transmission electron microscopy results indicated that the particle sizes are 10–20 nm. The selected area electron diffraction pattern has shown that as-prepared powder is polycrystalline in nature. The UV–visible spectrum analysis confirmed that the optical absorption edge of Ba2YbZrO5.5 is around 340 nm, corresponding to a band gap of ~ 3.65 eV. Photocatalytic activity of Ba2YbZrO5.5 nanoparticles is investigated for the degradation of methyl orange under solar irradiation.

scholarly journals Hydrothermal Synthesis of Iodine-Doped Nanoplates with Enhanced Visible and Ultraviolet-Induced Photocatalytic Activities

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Jiang Zhang ◽  
Zheng-Hong Huang ◽  
Yong Xu ◽  
Feiyu Kang
Keyword(s):  
Photocatalytic Activity ◽  
Photoelectron Spectroscopy ◽  
Oxygen Vacancies ◽  
Diffuse Reflectance Spectroscopy ◽  
Synergetic Effect ◽  
X Ray Diffraction ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Photocatalytic Activities

The iodine-doped Bi2WO6(I-BWO) photocatalyst was prepared via a hydrothermal method using potassium iodide as the source of iodine. The samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and selected area electron diffraction (SAED), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The photocatalytic activity of I-BWO for the degradation of rhodamine B (RhB) was higher than that of pure BWO and I2-BWO regardless of visible light (>420 nm) or ultraviolet light (<400 nm) irradiation. The results of DRS analysis showed that the I-BWO and I2-BWO catalysts had narrower band gaps. XPS analysis proved that the multivalent iodine species including I0and were coadsorbed on the defect surface of Bi2WO6in I-BWO. The enhanced PL intensity revealed that a large number of defects of oxygen vacancies were formed by the doping of iodine. The enhanced photocatalytic activity of I-BWO for degradation of RhB was caused by the synergetic effect of a small crystalline size, a narrow band gap, and plenty of oxygen vacancies.

The High Thickness Ni Layer on Single-Walled Carbon Nanotubes Prepared by an Electroless Coating Process

2010 ◽  
Vol 148-149 ◽  
pp. 1607-1610
Author(s):  
Wei Xue Li ◽  
Dun Dong Wang ◽  
Hui Jin ◽  
Jian Feng Dai ◽  
Qing Wang
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Deposition Process ◽  
X Ray Diffraction ◽  
Electroless Coating ◽  
Single Walled Carbon ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
20 Nm ◽  
Walled Carbon Nanotubes

The Single-walled carbon nanotubes were coated with Ni-P layers by an electroless plating technique. A Ni-P layers are thick and smooth and on individual nanotube with thickness of 20 nm can be obtained after the deposition process. The Single-walled carbon nanotubes were obtained in the suspension of purification solution. The samples have been characterized by X-ray diffraction, selected area electron diffraction, transmission electron microscopy and energy dispersive spectrometry.The coating layers after heat-treatment convert the amorphous Ni-P coated layers into the nanocrystalline Ni-P layers.

Adsorption Performances and Electrochemical Properties of Methyl Blue onto CoFe2O4 Nanoparticles

2021 ◽  
Vol 21 (4) ◽  
pp. 2203-2211 ◽  
Author(s):  
Xiang-Jun Zhou ◽  
Yan-Yan Wang ◽  
Zhou Wang
Keyword(s):  
Electrochemical Properties ◽  
Methyl Blue ◽  
Anhydrous Ethanol ◽  
X Ray Diffraction ◽  
Process Data ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Average Grain Size ◽  
Pseudo Second Order ◽  
20 Nm

Magnetic CoFe2O4 nanoparticles were successfully manufactured through the process of nitrate combustion using anhydrous ethanol as fuel, they together with their intermediate were characterized by thermo gravimetric (TG) analysis, selected area electron diffraction (SAED), transmission electron microscope (TEM), vibrating sample magnetometer (VSM), and X-ray diffraction (XRD). These results indicated a phenomenon that the magnetic CoFe2O4 nanoparticles could be formed at 400 °C, the average grain size, the specific magnetization, and the specific surface area of magnetic CoFe2O4 nanoparticles fabricated at 400 °C for 2 h with 30 mL anhydrous ethanol were corresponding 20 nm, 78.0 Am2/kg and 83.2 m2/kg. Magnetic CoFe2O4 nanoparticles were in application to adsorb methyl blue (MB) of wastewater, and their adsorption performances and electrochemical properties were investigated, the adsorption process data well agreed with the pseudo-second-order kinetics model in concentration ranging from 100 mg/L to 400 mg/L of MB. Compared with Freundlich model, Langmuir model (correlation coefficient R2 = 0.9976) could evaluate the adsorption equilibrium state of MB onto CoFe2O4 nanoparticles at indoor temperature, so the monomolecular layer adsorption mechanism was demonstrated to be the mechanism of the MB molecules' adsorption onto CoFe2O4 nanoparticles.

scholarly journals Synthesis of nanomaterials using expired medicines: an eco-friendly option

2012 ◽  
Vol 2 (1) ◽  
pp. 7 ◽  
Author(s):  
Anal K. Jha ◽  
Kamal Prasad
Keyword(s):  
Single Step ◽  
Molecular Organization ◽  
Cds Nanoparticles ◽  
X Ray Diffraction ◽  
Green Approach ◽  
Transmission Electron ◽  
Novel Method ◽  
Molecular Forces ◽  
First Time ◽  
Expired Medicines

Expired medicines are a burden to the environment. In this paper, a novel method is suggested to reutilize expired medicines in order to assess the possibilities of synthesizing a variety of nanomaterials. To this end, expired flouroquinolone (norfloxacin) and tinidazole combinations were used to synthesize metal (Au), oxide (ZrO<sub>2</sub>) and chalcognide (CdS) nanoparticles using for the first time a green chemistry approach. Au, ZrO<sub>2</sub> and CdS nanoparticles are available in convenient sizes of 6 nm, 26 nm and 18 nm, respectively, and remain stable for at least six months. This novel procedure is possible thanks to their molecular organization and elements. The inclusion of a fluorine atom in a drug molecule may influence both the disposition of the drug and its interaction with its pharmacological target; for example, the effects of fluorine substitution on the inter- and intra-molecular forces that affect binding of ligands. The presence of sulfur in the tinidazole molecules may also have contributed towards synthesis through proton withdrawal. The nanomaterials synthesized in this way were characterized using X-ray diffraction analysis and transmission electron microscopy to identify the formation of the desired nanoparticles. This single-step green approach is very convenient, simple and can be extended to synthesize a variety of nanomaterials that might find new technological and pharmaceutical applications.

Synthesis and characterization of 3D Cu0.45Mn0.55O2 nanoflowers with novel photoluminescence and magnetic properties

2014 ◽  
Vol 28 (09) ◽  
pp. 1450071
Author(s):  
Arbab Mohammad Toufiq ◽  
Fengping Wang ◽  
Qurat-ul-ain Javed ◽  
Quanshui Li ◽  
Yan Li
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Three Dimensional ◽  
Ferromagnetic Behavior ◽  
X Ray Diffraction ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Growth Method ◽  
First Time

In this paper, three-dimensional (3D) Cu 0.45 Mn 0.55 O 2 nanoflowers self-assembled by interconnecting dense stacked single-crystalline nanoplates have been prepared using the template-free hydrothermal growth method. The morphology, phase structure and composition of the as-prepared nanomaterial were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) with selected area electron diffraction (SAED) and energy-dispersive X-ray spectroscopy (EDX). FESEM and TEM analyses show that the size of 3D Cu 0.45 Mn 0.55 O 2 nanoflowers is in the range of 1–1.5 μm and the thickness of interconnected nanoplates is about 40 nm on the average. The photoluminescence (PL) spectra of the as-prepared Cu 0.45 Mn 0.55 O 2 nanostructures at room temperature exhibits prominent emission bands located in red–violet spectral region. Moreover, magnetic investigations revealed the weak ferromagnetic behavior of the as-prepared Cu 0.45 Mn 0.55 O 2 nanoflowers and reported for the first time using vibrating sample magnetometer (VSM).

MOLTEN SALT SYNTHESIS OF La2O2SO4 NANOSHEETS AND THEIR LUMINESCENT PROPERTIES WITH Eu3+ DOPING

2013 ◽  
Vol 06 (02) ◽  
pp. 1350019 ◽  
Author(s):  
XIAO-ZHU HUANG ◽  
ZHEN LIU ◽  
YIYI YANG ◽  
YANG TIAN
Keyword(s):  
Molten Salt ◽  
Molten Salts ◽  
Luminescent Properties ◽  
Molten Salt Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
High Resolution Tem ◽  
First Time

Two-dimensional nanosheets of lanthanum oxysulfates ( La2O2SO4 ) are prepared for the first time by a facile, effective molten salt synthesis route at a low temperature (400°C). Transmission electron microscopy (TEM) shows that the nanosheets are 100 nm to 200 nm thick and several micrometers in in-plane size. The intrinsic crystallography of the nanosheets is characterized by X-ray diffraction, high-resolution TEM, and selected area electron diffraction. The composition of the sample is studied by energy dispersive X-ray spectroscopy. The formation process of the nanosheets in molten salts is also investigated. The luminescence properties of the obtained La2O2SO4 nanosheets are investigated by doping with Eu3+ at different concentrations. The nanosheets are found to exhibit good monochromaticity with high color saturation.

scholarly journals Template-Free Synthesis of Porous Cu2O Nanospheres at Room Temperature and Investigation on Their Adsorption Property

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Ying Zhang ◽  
Dong Wang ◽  
Xu Zhang ◽  
Fengyu Qu
Keyword(s):  
Electron Microscopy ◽  
Ir Spectrum ◽  
Room Temperature ◽  
Adsorption Property ◽  
X Ray Diffraction ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Ft Ir ◽  
20 Nm ◽  
Adsorption Desorption

Porous cuprous oxide (Cu2O) nanospheres composed of small nanoparticles with diameters at 10~20 nm were successfully synthesized without surfactant at room temperature within 5 min. The products were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), N2adsorption-desorption, and Fourier transform infrared (FT-IR) spectrum. The adsorption ability of the as-prepared products towards methyl orange (MO) as the pollutant was investigated and FT-IR spectrum was employed to identify the adsorbed species. In addition, the reusability of the as-prepared products was studied as well.

Cu(OH)2/N-TiO2 Compound Heterojunction Photcocatalyst: Preparation, Characterization and Photocatalytic Properties

2013 ◽  
Vol 652-654 ◽  
pp. 774-778
Author(s):  
Xiao Song Zhou ◽  
Bei Jin ◽  
Bin Yang
Keyword(s):  
Visible Light ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spherical Structure ◽  
Visible Light Range ◽  
Transmission Electron ◽  
Photocatalytic Activities ◽  
20 Nm

Cu(OH)2/N-TiO2compound heterojunction photcocatalyst was prepared via a facile precipitation method. The as-synthesized samples were characterized by means of X-ray diffraction (XRD), field-emission transmission electron microscope (FE-SEM), ultraviolet-visible light (UV-vis) absorbance spectra technologies. The results suggest the as-obtained samples are spherical structure with the diameter of approximately 10-20 nm, the absorbance intensity in the visible light range increased with the amount of deposited increased. Photocatalytic activities of samples were investigated under visible light and methyl orange (MO) acted as simulation pollutants. The catalytic ablity of the synthesized photocatalysts under visible light irradiation showed higher than that of N-P25(TiO2). The remarkable photocatalytic activities are due to the high-quality of composites structure and the driving force for electron transfer in nanoparticle.

Controlled Synthesis of Hierarchical Flower-Like CuS Spheres by a Facile Microwave Hydrothermal Method

2012 ◽  
Vol 512-515 ◽  
pp. 265-268 ◽  
Author(s):  
Hui Qi ◽  
Jian Feng Huang ◽  
Li Yun Cao ◽  
Jian Peng Wu
Keyword(s):  
Electron Microscopy ◽  
Cetyltrimethylammonium Bromide ◽  
Controlled Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Hydrothermal ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Average Size ◽  
20 Nm

–Hierarchical flower–like CuS spheres have been synthesized by a facile microwave hydrothermal (MH) method using cetyltrimethylammonium bromide (CTAB) as the surfactant. The as–prepared CuS crystallites under different CTAB contents were characterized by X–ray diffraction (XRD), field–emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and selected area electron diffraction (SAED). Results show that the CTAB–assisted CuS particles have hierarchical flower–like microstructures that were assembled by thin nanoflakes with thickness of 10~20 nm. The corresponding HRTEM images reveal that these nanoflakes are composed of many nanoparticles with average size of about 7 nm. Moreover, when increasing the CTAB contents from 0 g⁄mL to 0.02 g⁄mL, the as–prepared CuS particles were found to have better dispersion stability with decreased average sizes of the hierarchical flower–like spheres. Comparing with the bulk CuS particles, the related UV–vis absorption spectrum of the as–prepared crystallites exhibits an obvious red shift with the absorption peak at 739 nm.

scholarly journals Biosynthesis of Silver Nanoparticles from Desmodium triflorum: A Novel Approach Towards Weed Utilization

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Naheed Ahmad ◽  
Seema Sharma ◽  
V. N. Singh ◽  
S. F. Shamsi ◽  
Anjum Fatma ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Visible Spectrum ◽  
Silver Ions ◽  
Single Step ◽  
Water Soluble ◽  
Novel Approach ◽  
Transmission Electron ◽  
Antioxidative Agents ◽  
Ascorbic Acids ◽  
20 Nm

A single-step environmental friendly approach is employed to synthesize silver nanoparticles. The biomolecules found in plants induce the reduction of Ag+ ions from silver nitrate to silver nanoparticles (AgNPs). UV-visible spectrum of the aqueous medium containing silver ions demonstrated a peak at 425 nm corresponding to the plasmon absorbance of silver nanoparticles. Transmission electron microscopy (TEM) showed the formation of well-dispersed silver nanoparticles in the range of 5–20 nm. X-ray diffraction (XRD) spectrum of the AgNPs exhibited 2θ values corresponding to the silver nanocrystal. The process of reduction is extracellular and fast which may lead to the development of easy biosynthesis of silver nanoparticles. Plants during glycolysis produce a large amount of H+ ions along with NAD which acts as a strong redoxing agent; this seems to be responsible for the formation of AgNPs. Water-soluble antioxidative agents like ascorbic acids further seem to be responsible for the reduction of AgNPs. These AgNPs produced show good antimicrobial activity against common pathogens.

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