scholarly journals XRD and CO2 Adsorption Studies of Modified Silica Gel with Octadecylamine

2017 ◽  
Vol 888 ◽  
pp. 529-533
Author(s):  
Maratun Najiha Abu Tahari ◽  
Azizul Hakim ◽  
Tengku Sharifah Marliza ◽  
Nurul Hanisah Mohd ◽  
Mohd Ambar Yarmo
Keyword(s):  
Heat Treatment ◽  
Silica Gel ◽  
Xrd Analysis ◽  
Straight Chain ◽  
Modified Silica Gel ◽  
Wet Impregnation ◽  
Impregnation Process ◽  
Process Characterization ◽  
Amine Compounds ◽  
Adsorption Desorption

Porous surface of silica gel (SG) have been modified with long and straight chain fatty amine compounds (octadecylamine, ODA) via wet impregnation process. SG was undergo heat treatment with various temperature which are 100, 200, 400 and 600 °C before continuing with impregnation process. Characterization by XRD of the treated samples were showed no significant different in their diffractograms. The best temperature for heat treatment was 600 °C and it was referred to the ability of the SG600 type adsorbents in adsorbing CO2 resulted from adsorption desorption isotherm of CO2. The 5 and 35 wt. % of ODA supported on the SG (ODA/SG600) was further characterized using XRD analysis which displayed the increasing intensity of crystalline ODA with higher percent amine loaded and shifting of the several crystalline peak of ODA verified the interaction of SG600-ODA. These further strengthen the prevailing dispersion of ODA on the surface of SG600.

Application of Octadecylamine-Based Adsorbent on Carbon Dioxide Capture

2020 ◽  
Vol 1010 ◽  
pp. 367-372
Author(s):  
Maratun Najiha Abu Tahari ◽  
Azizul Hakim Lahuri ◽  
Zaitun Ghazali ◽  
Salma Samidin ◽  
Siti Sarahah Sulhadi ◽  
...  
Keyword(s):  
Carbon Dioxide Capture ◽  
Xrd Analysis ◽  
Fatty Amine ◽  
Wet Impregnation ◽  
Impregnation Process ◽  
Pore Blockage ◽  
Solid Adsorbents ◽  
Desorption Isotherms ◽  
Amine Compounds ◽  
Adsorption Desorption

Porous surface of silica gel (SG) have been modified with alkyl fatty amine compounds (octadecylamine, ODA) via wet impregnation process. The ODA-based adsorbents were physically characterized by XRD. The presence of crystalline peaks on ODA/SG diffractograms were ascertained the well-dispersion of ODA on the SG surface. XRD analysis displayed the increasing intensity of crystalline ODA with higher percent amine loaded and shifting of the several crystalline peaks of ODA verified the interaction of SG600-ODA. Capacity of CO2 capture by prepared solid adsorbents were evaluated using CO2 adsorption-desorption isotherms. This study shows that increasing percentage of ODA were improved the amount of CO2 uptake by following this trend: 35ODA/SG > 25ODA/SG > 15ODA/SG > SG > 5ODA/SG. However, promotion of 5 wt.% ODA unabled to enhance the capacity of CO2 captured due to pore blockage and reduction in SG pore surface, thus hindered the physisorption between CO2 and SG.

Photocatalytic Activity of TiO2 Nanotube Modified by Cobalt

2011 ◽  
Vol 110-116 ◽  
pp. 559-564
Author(s):  
Xin Sheng Yang ◽  
Hern Kim
Keyword(s):  
Xrd Analysis ◽  
Treatment Temperature ◽  
Degradation Efficiency ◽  
Impregnation Method ◽  
High Concentration ◽  
Wet Impregnation ◽  
Impregnation Process ◽  
Uv Illumination ◽  
Wet Impregnation Method ◽  
Enhanced Degradation

Cobalt modified TiO2nanotube was prepared by wet impregnation method from anodized nanotube. The microstructure and phase characteristic were studied by SEM, EDX and XRD analysis. The photocatalytic degradation of methylene blue under UV illumination was studied. Enhanced degradation efficiency could be obtained after sodium borohydride reducing. For the samples using low concentration of CoCl2in wet impregnation process, the degradation efficiency increased with the increase of CoCl2concentration and for high concentration, the degradation efficiency decreased. With increasing the post-treatment temperature, the degradation efficiency decreased.

Synthesis Process and Structure of Al/Mg Modified Silica-gel Particle.

2000 ◽  
Vol 116 (1) ◽  
pp. 56-61
Author(s):  
Tatsuo YAMAGUCHI ◽  
Toshiaki NAKAI ◽  
Kunihiko TAKEDA
Keyword(s):  
Silica Gel ◽  
Synthesis Process ◽  
Modified Silica ◽  
Modified Silica Gel

scholarly journals Extraction and Mass Spectrometric Characterization of Terpenes Recovered from Olive Leaves Using a New Adsorbent-Assisted Supercritical CO2 Process

Foods ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1301
Author(s):  
Zully J. Suárez Montenegro ◽  
Gerardo Álvarez-Rivera ◽  
Jose A. Mendiola ◽  
Elena Ibáñez ◽  
Alejandro Cifuentes
Keyword(s):  
Aluminum Oxide ◽  
Silica Gel ◽  
Supercritical Co2 ◽  
Olive Leaves ◽  
Fractionation Process ◽  
Selective Enrichment ◽  
Adsorption Desorption ◽  
First Time ◽  
By Products

This work reports the use of GC-QTOF-MS to obtain a deep characterization of terpenoid compounds recovered from olive leaves, which is one of the largest by-products generated by the olive oil industry. This work includes an innovative supercritical CO2 fractionation process based on the online coupling of supercritical fluid extraction (SFE) and dynamic adsorption/desorption for the selective enrichment of terpenoids in the different olive leaves extracts. The selectivity of different commercial adsorbents such as silica gel, zeolite, and aluminum oxide was evaluated toward the different terpene families present in olive leaves. Operating at 30 MPa and 60 °C, an adsorbent-assisted fractionation was carried out every 20 min for a total time of 120 min. For the first time, GC-QTOF-MS allowed the identification of 40 terpenoids in olive leaves. The GC-QTOF-MS results indicate that silica gel is a suitable adsorbent to partially retain polyunsaturated C10 and C15 terpenes. In addition, aluminum oxide increases C20 recoveries, whereas crystalline zeolites favor C30 terpenes recoveries. The different healthy properties that have been described for terpenoids makes the current SFE-GC-QTOF-MS process especially interesting and suitable for their revalorization.

scholarly journals Experimental Comparison of Innovative Composite Sorbents for Space Heating and Domestic Hot Water Storage

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 476
Author(s):  
Vincenza Brancato ◽  
Larisa G. Gordeeva ◽  
Angela Caprì ◽  
Alexandra D. Grekova ◽  
Andrea Frazzica
Keyword(s):  
Silica Gel ◽  
Xrd Analysis ◽  
Complete Characterization ◽  
Operating Conditions ◽  
Hot Water ◽  
Experimental Comparison ◽  
Space Heating ◽  
Calorimetric Analysis ◽  
Domestic Hot Water ◽  
Composite Sorbents

In this study, the development and comparative characterization of different composite sorbents for thermal energy storage applications is reported. Two different applications were targeted, namely, low-temperature space heating (SH) and domestic hot water (DHW) provision. From a literature analysis, the most promising hygroscopic salts were selected for these conditions, being LiCl for SH and LiBr for DHW. Furthermore, two mesoporous silica gel matrixes and a macroporous vermiculite were acquired to prepare the composites. A complete characterization was performed by investigating the porous structure of the composites before and after impregnation, through N2 physisorption, as well as checking the phase composition of the composites at different temperatures through X-ray powder diffraction (XRD) analysis. Furthermore, sorption equilibrium curves were measured in water vapor atmosphere to evaluate the adsorption capacity of the samples and a detailed calorimetric analysis was carried out to evaluate the reaction evolution under real operating conditions as well as the sorption heat of each sample. The results demonstrated a slower reaction kinetic in the vermiculite-based composites, due to the larger size of salt grains embedded in the pores, while promising volumetric storage densities of 0.7 GJ/m3 and 0.4 GJ/m3 in silica gel-based composites were achieved for SH and DHW applications, respectively.

Reduction of Gd6UO12 for the Synthesis of Gd6UO11

2013 ◽  
Vol 1514 ◽  
pp. 151-156
Author(s):  
Darío Pieck ◽  
Lionel Desgranges ◽  
Yves Pontillon ◽  
Pierre Matheron
Keyword(s):  
Heat Treatment ◽  
Xrd Analysis ◽  
Decomposition Products ◽  
Air Atmosphere ◽  
Reducing Conditions ◽  
Reducing Environment

ABSTRACTIn the present work, we focus on δ-Gd6UO12 phase and its stability under reducing conditions. This later point is interesting regarding reducing environment that could exist in some nuclear storage sites and that could possibly degrade δ–compounds. A polycrystalline δ-Gd6UO12 sample was prepared by sintering cubic-Gd2O3 and UO2 mixed powders under an air atmosphere. The resulting pellets were then characterized and reduced by heat treatment under an Ar with H2 5% atmosphere. XRD analysis of the sample after reduction did not confirm the reduction into Gd6UO11 but a decomposition of the δ-compound. Preliminary characterizations of these decomposition products are presented.

DFT studies on coordination models for adsorption essays of Cu(II) and Ni(II) solutions in modified silica gel with iminodiacetic groups

2016 ◽  
Vol 71 (6) ◽  
pp. 1019-1030 ◽  
Author(s):  
Alexander Carreño ◽  
Eduardo Schott ◽  
Ximena Zarate ◽  
Juan Manuel Manriquez ◽  
Juan C. Vega ◽  
...  
Keyword(s):  
Silica Gel ◽  
Dft Studies ◽  
Modified Silica ◽  
Modified Silica Gel
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