Ardeshir Shokrollahi; Salimeh Abbasi; Shaghayegh Mohammadpour Shirazi
Abstract
In this article the synthesis of Fe3O4@MCM-41@NH-2,6-pydc as good adsorbent with potential of many applications, by coprecipitation method, was reported. For this purpose, Fe3O4 was synthesized, then protected with MCM-41 as a shell. Afterward, Fe3O4@MCM-41 functionalized by 2,6-pyridine dicarboxylic ...
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In this article the synthesis of Fe3O4@MCM-41@NH-2,6-pydc as good adsorbent with potential of many applications, by coprecipitation method, was reported. For this purpose, Fe3O4 was synthesized, then protected with MCM-41 as a shell. Afterward, Fe3O4@MCM-41 functionalized by 2,6-pyridine dicarboxylic acid (pydc) after modifying by 3-aminopropyl trimethoxysilane (APTMS). This adsorbent characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), energy dispersive X-ray (EDX), scanning electron microscope (SEM), Brunauer–Emmett–Teller (BET), differential thermal analysis (DTA), thermogravimetric analyses (TGA) and derivative thermogravimetric (DTG). The vibrating sample magnetometer (VSM) has been used to investigate its magnetic properties.
Richard D. Sudduth
Abstract
Two full concentration range percolation threshold models were evaluated for three different carbon fillers in both Nylon 6,6 and Lexan. A new Modified Landauer Model was introduced in this study and compared with a Percolation Threshold Model recently published by this author. These models were ...
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Two full concentration range percolation threshold models were evaluated for three different carbon fillers in both Nylon 6,6 and Lexan. A new Modified Landauer Model was introduced in this study and compared with a Percolation Threshold Model recently published by this author. These models were then utilized to address how to best characterize the interfacial surface energy, gpf, for composite electrical conduction measurements using Clingerman’s data. Three different models used for calculating the interfacial surface energies, gpf, were evaluated in this study. It was found that solid measurements used in calculating the Fowkes equation for the interfacial surface energy gave the most consistent correlations. A linear correlation was found between the Fowkes Interfacial surface energy and the b constant designated as the insulation surface interaction magnitude from the new Percolation Threshold Model. In addition, three concurrent mathematical conditions were found to occur at the same concentration for both the new percolation threshold models yielding S-shaped curves in this study. These conditions include the concentration at the Inflection Point, the concentration at the maximum slope and the maximum extrapolated percolation threshold concentration calculated at the same concentration.
Atul B. Lavand; Yuvraj S. Malghe
Abstract
Nanosized bare and carbon (C)-doped TiO2 were prepared using reverse micro-emulsion method. Synthesized powders were characterized with the help of X-ray diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive X-ray spectroscope (EDX) and UV-visible ...
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Nanosized bare and carbon (C)-doped TiO2 were prepared using reverse micro-emulsion method. Synthesized powders were characterized with the help of X-ray diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive X-ray spectroscope (EDX) and UV-visible spectrophotometer. EDX study reveals that as calcination temperature increases amount of C on TiO2 decreases. SEM and TEM images show that TiO2 particles are spherical in shape and after increasing the calcination temperature size of particle increases. Particle size of TiO2 obtained from TEM data varies between 10 to 17nm. Visible light photocatalytic degradation of 2,4,6-trichlorophenol (TCP) aqueous solution was carried out using nanosized bare as well as C-doped TiO2. UV-visible spectrophotometer and high pressure liquid chromatography (HPLC) techniques were used to analyze the concentration of TCP during the degradation process. In presence of visible light C-doped TiO2 obtained after calcination of precursor at 300°C shows better photocatalytic activity. Parameters affecting the photocatalytic process such as calcination temperature, amount of catalyst and TCP concentration are investigated. TCP photocatalytic degradation process was optimized. It is observed that to get better photocatalytic activity optimum amount of photocatalyst and concentration of TCP solution required are 1.0 gL -1 and 20 mg L -1 respectively. Reusability study indicates that C doped TiO2 prepared in the present work is highly stable and reusable photo catalyst.
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