Fabrication of zero valent iron (ZVI) nanotube film via potentiostatic anodization and electroreduction

2009 ◽  
Vol 59 (12) ◽  
pp. 2503-2507 ◽  
Author(s):  
Jun-Won Jang ◽  
Jung-Eui Jun ◽  
Jae-Woo Park
Keyword(s):  
Reduction Process ◽  
Zero Valent Iron ◽  
Iron Film ◽  
Iron Foil ◽  
X Ray Diffraction ◽  
X Ray ◽  
Self Organized ◽  
Reduction Of Iron ◽  
Wide Range ◽  
Scanning Electron

Zero valent iron has been successfully used for the degradation of a wide range of contaminants. However, this reaction of using ZVI particle produces a large quantity of iron sludge. To solve the problem, we report the synthesis of self-organized nanoporous zero valent iron film treated with anodization and electro-reduction of iron foil. The iron nanotubes were fabricated in 1 M Na2SO4 + 0.5 wt% NaF electrolyte by supplying constant electric currents of 50 mV/s, and holding the potential at 20, 40 and 60 V for 20 min. Nanoporous shape was produced by anodic oxidation of iron film. After anodizing process, electro-reduction of nanoporous iron film converted crystallization iron oxide to zero valent iron. Electro-reduction process was carried out by electro-reducing with powersupply to and holding the potential at 20 V for 20 min. The surface of iron nanotube film was examined by BET and the thickness of the oxidized films was evaluated by scanning electron microscope (SEM). The crystalline structures of the fabricated films were evaluated using X-ray diffraction (XRD).

Synthesis of Fe2O3/CNTs for the Fast Removal of Tetracycline from Aqueous Solutions

2014 ◽  
Vol 915-916 ◽  
pp. 933-941 ◽  
Author(s):  
Zhong Jie Zhang ◽  
Chang Yu Lu ◽  
Wei Huang ◽  
Wei Sheng Guan ◽  
Yue Xin Peng
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Magnetic Measurements ◽  
Ferrite Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Wide Range ◽  
Fast Removal ◽  
Scanning Electron

The effective remove to tetracycline still remains a big challenge for scientists. In this work, we used a new method for preparing functional magnetic CNTS with ferrite nanoparticles. A wide range of techniques, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and magnetic measurements were applied to characterize the obtained Fe2O3/CNTs. Moreover, we have also studied the properties of adsorbent to tetracycline. In addition, we have found that the Fe2O3/CNTs are better reusable adsorbent than other traditional adsorbents by magnetic separation recycling method.

Microstructural and Colour Analysis of CuCrO2 Delafossite Obtained by Gelatin Method

2014 ◽  
Vol 798-799 ◽  
pp. 160-164 ◽  
Author(s):  
Asenete Frutuoso Costa ◽  
P.M. Pimentel ◽  
F.M. Aquino ◽  
D.M.A. Melo ◽  
M.A.F. Melo ◽  
...  
Keyword(s):  
Steam Reforming ◽  
Synthesis Process ◽  
Ceramic Pigments ◽  
X Ray Diffraction ◽  
Visible Spectroscopy ◽  
Organic Precursor ◽  
X Ray ◽  
Wide Range ◽  
Uv Visible ◽  
Scanning Electron

In this paper, CuCrO2the compound was synthesized by a route new that uses gelatin as organic precursor in order to application as ceramic pigments. The type of compound delafossite CuCrO2is known for its wide range of application, such as, thermoelectric devices, catalysts for the steam reforming process, ceramic pigments, NiO2 removal, among. The powders resulting from the synthesis process were calcined the 900°C and characterized by X-ray diffraction (XRD), infrared spectroscopy, scanning electron microscopy (SEM), UV-Visible spectroscopy and colorimetry analysis. The results showed for the CuCrO2have coloring green.

Effects of selected bleaching agents on the functional and structural properties of orange albedo starch-based bioplastics

2020 ◽  
Vol 40 (2) ◽  
pp. 120-128
Author(s):  
Adewale G. Adeniyi ◽  
Oluwaseyi D. Saliu ◽  
Joshua O. Ighalo ◽  
Adebayo I. Olosho ◽  
Deborah T. Bankole ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Weight Loss ◽  
Sodium Perborate ◽  
X Ray Diffraction ◽  
Flow Properties ◽  
X Ray ◽  
Infrared Scanning ◽  
Wide Range ◽  
Scanning Electron

AbstractRecent research has proven that starch offers a wide range of industrial, commercial, and utility applications if they are optimally processed and refined. In this study, the effect of hydrogen peroxide (HP), sodium persulfite, peracetic acid (PAA), and sodium perborate (SPB) bleaching agents on the physiochemical, surface, mechanical, and flow properties were investigated. The various bleached starch bioplastics were characterized using Fourier transform infrared, scanning electron microscopy, X-ray diffraction, and thermogravimetric analysis. Hydroxyl and carbonyl (C=O) stretching were seen for HP- and PAA-bleached starch bioplastics at 3285 and 1736 and 3265 and 1698 cm−1, respectively. The C=O band was absent for SPB-treated starch, whereas the C=S band was seen on sodium hyposulfite (SHS)-treated starch. The morphologies of starch were retained with little agglomerations, except for HP-treated starch bioplastics with a morphology change. HP-treated starch had the highest percentage crystallinity (66%) and the highest thermal stability (74% weight loss), whereas PAA-treated starch had the lowest percentage crystallinity (34%) and the lowest thermal stability (88% weight loss). HP- and SHS-bleached starch bioplastics had the best surface, mechanical, and expansion properties.

Fabrication of α-Fe2O3 Nanowires by Thermal Oxidation Method

2011 ◽  
Vol 694 ◽  
pp. 79-84 ◽  
Author(s):  
Ling Li ◽  
Hai Wang ◽  
Hong Wei Jiang
Keyword(s):  
Thermal Oxidation ◽  
Average Diameter ◽  
Iron Foil ◽  
X Ray Diffraction ◽  
Large Area ◽  
Oxidation Method ◽  
X Ray ◽  
Micro Raman Spectroscopy ◽  
Atmosphere Environment ◽  
Scanning Electron

A large area of hematite (α-Fe2O3) nanowires has been successfully synthesized by thermal oxidation of iron foil in an atmosphere environment. The effects on the growth of nanowires have been systematically studied by adjusting the oxidizing environment as well as the reacting temperature and annealing time. The samples were characterized by scanning electron microscope (SEM), x-ray diffraction (XRD) and micro-Raman spectroscopy. Optimum condition was obtained by annealing sample at 600°C for four hours in oxygen-poor environment. Nanowires with dense, high aspect ratio and sharp tips were observed. The average diameter and length of the nanowires was 80 nm and 5μm, respectively.

Molecular Interactions of Quinidine with Phospholipid Bilayers

1995 ◽  
Vol 50 (7-8) ◽  
pp. 527-534 ◽  
Author(s):  
M. Suwalsky ◽  
F. Villena ◽  
M. Bagnara ◽  
C. P. Sotomayor
Keyword(s):  
Sodium Channels ◽  
Antiarrhythmic Drugs ◽  
Phospholipid Bilayers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Molar Ratios ◽  
Wide Range ◽  
Molecular Mechanism Of Action ◽  
Nonspecific Interactions ◽  
Scanning Electron

Abstract Quinidine (QUIN) is one of the most important and efficient antiarrhythmic drugs (AAD). It belongs to class I. which are the drugs that exert their action at the level of the sodium channels in the membrane of the myocard. Several hypotheses support the idea that the molecular mechanism of action of the AAD is via nonspecific interactions with phospholipids sited in the neighborhood of the channels. In order to probe the validity of these hypotheses, QUIN was made to interact with the phospholipids dimyristoylphosphadidylcholine (DMPC) and dimyristoylphosphatidylethanolamine (DMPE). These interactions were performed in a hydrophobic and a hydrophilic medium under a wide range of molar ratios. The resulting products were analyzed by X-ray diffraction. QUIN solutions were also made to interact with DMPC liposomes, which were studied by fluorescent spectroscopy. Finally, human erythrocytes which were incubated with QUIN solutions were observed by scanning electron microscopy. The results of these experiments proved that QUIN indeed interacted with phos­pholipid bilayers.

PREPARATION OF NICKEL OXIDE EMBEDDED SELF ORGANIZED TITANIA NANOTUBES ARRAY BY NEW ALGINATE METHOD AS A SUPERCAPACITOR ELECTRODE

2013 ◽  
Vol 20 (06) ◽  
pp. 1350062 ◽  
Author(s):  
HABIBEH HADAD DABAGHI ◽  
MAHMOOD KAZEMZAD ◽  
YADOLAH GANJKHANLOU ◽  
RAHMATOLLAH ESKANDARI
Keyword(s):  
Electron Microscopy ◽  
Titania Nanotubes ◽  
X Ray Diffraction ◽  
Supercapacitor Electrode ◽  
X Ray ◽  
Self Organized ◽  
Solar Energy Harvesting ◽  
Harvesting Systems ◽  
Diffraction Patterns ◽  
Scanning Electron

Potentiostatic two step anodizing of titanium utilized for preparation of self organized titania nanotubes arrays with diameter of 150 nm. Then the new alginate method has been applied for incorporation of NiO into the nanotubes. The prepared hybrid materials have been characterized by various methods including field emission scanning electron microscopy, X-ray diffractometry and cyclic voltammetry analyses. The X-ray diffraction patterns of samples were also studied by Rietveld's method. Results showed that the prepared electrode containing anatase, rutile and NiO phases with fraction of 70, 8, and 22%, respectively. It was found that by application of the new method, porous NiO uniformly coated on nanotubes surface and great enhancement of specific capacitance from 0.14 to 3.8 mF cm-2 could be obtained. The prepared nanocomposites are promising materials for supercapacitance application and also for solar energy harvesting systems.

Influence of CeO2 Additive on the Phase Transformations of Zirconia from Zircon Ore by Carbothermal Reduction Process

2014 ◽  
Vol 602-603 ◽  
pp. 238-241 ◽  
Author(s):  
Teng Yu Wang ◽  
You Guo Xu ◽  
Zhao Hui Huang ◽  
Ming Hao Fang ◽  
Yan Gai Liu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Phase Transformations ◽  
Carbothermal Reduction ◽  
Heating Temperature ◽  
Reduction Process ◽  
X Ray Diffraction ◽  
Stabilized Zirconia ◽  
X Ray ◽  
Additive Increase ◽  
Scanning Electron

This paper mainly discusses the influences of heating temperatures and CeO2 additive contents on the phase transformations of zirconia from zircon ore by carbothermal reduction. The phase transformations of zirconia from zircon ore by carbothermal reduction were monitored by X-ray diffraction. The microstructure of the product was characterized by scanning electron microscopy. The results show that without adding CeO2, the optimized heating temperature of zircon carbothermal reduction was 1600 °C and the main phases of the product were m-ZrO2, ZrC and β-SiC, t-ZrO2; After adding CeO2, the main phase of the products consists of t-ZrO2, m-ZrO2, ZrC and β-SiC when the heating temperature is 1600 °C. CeO2 additive can be introduced into zirconia lattice and can cause it to form cerium stabilized zirconia. Zirconia in the product would be turned into partially stabilized zirconia with cerium addition from 5 wt% to 20 wt%. However, the form of zirconia in the product is not changed greatly with the amount of CeO2 additive increase.

scholarly journals Thermodynamic and kinetic study of the recovery of tungsten and cobalt from tool waste

2018 ◽  
pp. 44-51
Author(s):  
Nestor Ricardo Rojas-Reyes ◽  
Sebastian Sierra-Perez ◽  
Jose Martinez-Zambrano ◽  
Hugo Alfonso Rojas-Sarmiento
Keyword(s):  
Hydrogen Reduction ◽  
Research Work ◽  
Reduction Process ◽  
Stability Diagram ◽  
X Ray Diffraction ◽  
X Ray ◽  
Reduction Processes ◽  
Metalworking Industry ◽  
Isothermal Kinetic ◽  
Scanning Electron

In the present research work, the recovery of tungsten and cobalt from waste coming from tungsten carbide-cobalt (WC-Co) tools, which are widely used in the metalworking industry, was analyzed. The WC-Co waste was characterized by X-ray diffraction and scanning electron microscopy with microanalysis (SEM/EDS). The process started with the oxidation of the waste to obtain a mixture of oxides (WO3 and CoWO4). The ΔH and ΔG were calculated both for the oxidation and reduction processes. Thermodynamic and non-isothermal kinetic analyses were carried out to obtain a stability diagram where theoretical and experimental data are defined by transformation lines as a function of temperature; in addition, the apparent activation energy was determined. By a hydrogen reduction process, high-purity tungsten and cobalt in metallic form were obtained.

Varistor Beahavior in Lead Based Perovskite Comounds

2001 ◽  
Vol 685 ◽  
Author(s):  
Seema Sharma ◽  
R.N.P. Choudhary
Keyword(s):  
Room Temperature ◽  
X Ray Diffraction ◽  
Solid State Reaction Technique ◽  
X Ray ◽  
Current Voltage ◽  
Wide Range ◽  
Ptcr Effect ◽  
Different Temperatures ◽  
Structure And Microstructure ◽  
Scanning Electron

Polycrystalline samples of Pb(Cd1/2W1/2)O3 and Pb(Mo1/2W1/2)O3 were synthesized by a high-temperature solid-state reaction technique. Preliminary crystal structure and microstructure of the compounds at room temperature were studied using X-ray diffraction (XRD) technique and Scanning electron microscopy (SEM), respectively. The dielectric permittivity (⊏) and losstangent (tan ⊏) of the compounds were obtained both as a function of frequency(103-104Hz) atroom temperature and temperature (30-3200C) at 10 kHz. Both the ac and dc conductivity have been studied over a wide range of temperature. The current– voltage (I-V) characteristics of the compound studied at different temperatures reveal that the Pb(Cd1/2W1/2)O3 also has excellent varistor behavior. A PTCR effect and NTCR effect was exhibited by Pb(Cd1/2W1/2)O3 and Pb(Cd1/2Mo1/2)O3 respectively.

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