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The main objective of the paper consists to analyze the adsorption process for capturing the carbon dioxide generated from the fossil fuel power plants. For simplifying our analysis, we have considered that the stream contains only carbon dioxide and nitrogen in a mole concentration of 13/87 %. The adsorption process was simulated in the Aspen Adsorption V9 considering silica gel impregnated with...
The Sol-Gel method is one of the techniques used to synthesize materials with a bimodal and hierarchical pore structure, which can be verified by different characterization techniques. The techniques of characterization of the materials of Silica exhibiting multimodal hierarchical porosity are Scanning Electron Microscopy (SEM) and Nitrogen adsorption-desorption isotherms, which serve to corroborate...
The efficiency of a functionalized Disordered Mesoporous Silica-1 (DMS-1) to remove mercury ions disperse in water was evaluated. This material was functionalized using 3-mercaptopropyltrimethoxisilan as the source of thiol groups using the post-synthesis method. The aforementioned sorbent system was characterized using N2 adsorption-desorption isotherms, Fourier Transform Infrared spectrometry (FTIR),...
The adsorption chiller technology makes possible to construct the chillers that can be powered by a low temperature heat source, which improves the efficiency of the energy and minimises the level of environmental pollutions. It has been found that adsorption chillers are valuable when the heat source is affordable as cogeneration, solar, geothermal, or waste heat sources, especially in situations...
We have developed a novel simulator for chemical mechanical planarization processes, based on the one variant of Monte-Carlo method. It implemented the several input parameters: pressure, diameters of abrasives, temperature, linear velocity of abrasives, and easiness to remove materials. This simulator reproduced the linear change in the amounts of the polished portions of materials with pressure*linear...
The quantitative control of dissolved humidity in organic liquids is the most important task. The most common method for testing dissolved humidity is the method of K. Fischer. But, this method has a number of peculiarities that prevent its widespread use. The authors of this article propose the number of features to measure the humidity of organic liquids. They are: 1) the sorption-frequency method...
The sol-gel method and supercritical fluids drying have been carried out for the successfully prepared of silica-titania aerogel monoliths. The obtained aerogel exhibits high properties with a density of 0.135 g/cm3. We characterized the microstructure and physical characteristic of silica-titania aerogel by the specific surface area, SEM, Hot-disk and FTIR. From the results shown that sample possess...
Because of their strong hydrophilicity, nanoporous silica materials are good candidates for humidity sensor applications. We employed molecular modeling to investigate the water behavior when confined in such materials in order to refine the design of the next generation of devices. We focused in this work on the mechanical behavior of those porous silica materials.
A high-resolution time series of the spectral reflectance of drying, sandy soils reveals sensitivities to the drying process that appear to be characteristic of the disposition of water on the surface of the soil. The increase in reflectance is clearly related to the decrease in overall water content, but the spectral details of the relationship are dependent on the link between soil and water at...
The present study is concerned by the exploration of the capability of natural and synthetic adsorbents to retain methyl orange dye. The effect of key operating parameters such as contact time, adsorbent dosage, initial pH and initial dye concentration on retention capacity, were investigated for these adsorbents. Various isotherm models like Langmuir and Freundlich were tested for the adsorption...
This paper is concerned with the adsorption of Cr(III) by natural zeolite and polymeric Al/Fe (PAFC) modified one. The effects of the kind of zeolite, surging time, initial concentration of Cr(III), pH and ionic strength on the adsorption performance were investigated. Meanwhile, the adsorption capacities of zeolite were discussed. The results showed that the amount of saturated adsorption of PAFC...
A selective adsorption material of Mn(II) ion was obtained using Mn(II) ion imprinted silica modified by di(2-picolyl)amine (dpa). The synthesized material (silica@dpa) was applied as separation of Mn(II) ions using batch modes. The adsorption conditions of Mn(II) ions such as the effect of pH, shaking time, foreign ions and adsorbent amount were investigated and optimized. The synthesized materials...
Adsorption properties of new rice hull ash (RHA) pretreated by white-rot fungi for oil bleaching process were researched in this paper. The results showed that the adsorption capacity and rate of new RHA were better than that of normal RHA, and the adsorption characteristic conformed to the Freundlich thermodynamic isotherms. The variations of adsorption enthalpy, the Gibbs free energy and the entropy...
The modified mesoporous silica with aminopropyl group (NH2-(CH2)3-MCM-41) and chloropropyl group (SH- (CH2)3-MCM-41) and pure mesoporous silica (MCM-41) have been synthesized via the microwave-assisted hydrothermal method. The samples were characterized by X ray diffraction, FT-IR spectroscopy and Nitrogen adsorption-desorption. Then adsorption test of copper ion was investigated. Langmuir model is...
Adsorption of 2, 4, 6-trichlorophenol onto octyl-modified ordered mesoporous silica material from aqueous solution has been investigated systematically using batch experiments in this study. Results indicate that 2, 4, 6-trichlorophenol adsorption is initially rapid and the adsorption process reaches a steady state after 1 min. The adsorption isotherms are well described by the Langmuir and the Freundlich...
An experimental and theoretical investigation of air desiccant conditioning system has been reported in the present work. An experimental test rig which contains blower, air heater, desiccant packed bed, air/water heat exchanger, humidifier and traditional air conditioner has been designed and constructed to carry out the required experimental measurements. Hollow cylindrical packed bed has been used...
Summary form only given. For chemical reactions occurring on the surfaces, e.g., catalysis and photocatalysis, design and fabrication of structures in two different scales, i.e., angstrom/nanometer and micrometer ranges. The former regulates the adsorption and surface reaction of molecules, while the latter gives influence on the diffusion and mechanical strength of the material. In order to control...
Studying on the eluting and adsorpting the saturated ANJ.SiC by different regenerants, NaOH is the most suitable one. The influence of the factors containing NaOH concentration, elution time and regeneration times on ANJ.SiC regeneration rate was studied. The results show that the best NaOH concentration is 0.5mol/L, with the regeneration rate of 115.83%; the best elution time is 60min, with the regeneration...
The inhibition effect of o- cresol on the corrosion of 6061 Al alloy/SiCp composite in 1 M hydrochloric acid solution at four different temperatures has been investigated using potentiostatic polarization technique and weight loss method. The results obtained reveal that o-cresol is an efficient cathodic inhibitor with greater than 70% of efficiency in the range of temperature studied. The adsorption...
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