Development of Ca(OH)2 Nanosorbent for Intermediate-High Temperature CO2 Capture via Wet Chemical Route in N,N-Dimethylformamide Solvent

2014 ◽  
Vol 911 ◽  
pp. 410-414
Author(s):  
Farah Diana Mohd Daud ◽  
Srimala Sreekantan ◽  
Abdul Rahman Mohamed
Keyword(s):  
Calcium Nitrate ◽  
Intermediate Temperature ◽  
Morphological Properties ◽  
Calcium Nitrate Tetrahydrate ◽  
Chemical Route ◽  
Before And After ◽  
Water Media ◽  
Chemical Technique ◽  
Wet Chemical ◽  
Wet Chemical Technique

CO2 is the major anthropogenic greenhouse gas which contributes to the increasing atmospheric CO2 concentration, leading to serious global warming and climate change. Thus, the present paper investigates the CO2-capture performance of synthesized calcium hydroxides, Ca (OH)2nanosorbent at intermediate-high temperatures which are 350, 450, 550 and 650oC. CO2 adsorption performance was analysed by thermo-gravimetricanalyser (TGA).The CO2 adsorption temperature strongly influenced the capture performance of the sorbent.Facile wet chemical technique was utilized to synthesize Ca (OH)2 nanorod sorbent structures using calcium nitrate tetrahydrate, Ca (NO3)2.4H2O as the calcium precursor, and precipitated with sodium hydroxides (NaOH) in N,N-Dimethylformamide (DMF) mixed deionized (DI) water media at 55 oC. X-ray diffraction (XRD) result exhibitedCa (OH)2hexagonal crystal structures. The Ca (OH)2 particle size and morphological properties before and after CO2 adsorption are studied by Field Emission Scanning Electron Microscopy (FESEM). The FESEM image indeed showed the rod like shape of Ca (OH)2nanosorbent with rod length approximately700 nm while the diameter 140nm. When CO2 molecules were adsorbed by Ca (OH)2nanosorbent, the nanorodstructures are changed to rigid interconnected each other like a lump shaped. Ca (OH)2nanosorbentseems to be a potentially good absorbent for capturing CO2when increased temperatures. However, at intermediate temperature 350 and 450oC, the synthesized Ca (OH)2nanosorbent demonstrated higher CO2 adsorption (141 to 220 mg/g CO2) than others intermediate temperature CO2 sorbent such as layer double hydroxides (LDH), lithium zirconates (LiZrO3) and hydrotalcite.

Structures of chemically stabilized ceramics

1993 ◽  
Vol 51 ◽  
pp. 924-925
Author(s):  
Pratibha L. Gai ◽  
M. A. Saltzberg ◽  
L.G. Hanna ◽  
S.C. Winchester
Keyword(s):  
High Temperature ◽  
Calcium Nitrate ◽  
Nitrate Hexahydrate ◽  
Chemical Route ◽  
Cubic Form ◽  
Tetragonal Form ◽  
Wet Chemical ◽  
Wet Chemical Route ◽  
Final Composition ◽  
Aluminium Nitrate Nonahydrate

Silica based ceramics are some of the most fundamental in crystal chemistry. The cristobalite form of silica has two modifications, α (low temperature, tetragonal form) and β (high temperature, cubic form). This paper describes our structural studies of unusual chemically stabilized cristobalite (CSC) material, a room temperature silica-based ceramic containing small amounts of dopants, prepared by a wet chemical route. It displays many of the structural charatcteristics of the high temperature β-cristobalite (∼270°C), but does not undergo phase inversion to α-cristobalite upon cooling. The Structure of α-cristobalite is well established, but that of β is not yet fully understood.Compositions with varying Ca/Al ratio and substitutions in cristobalite were prepared in the series, CaO:Al2O3:SiO2 : 3-x: x : 40, with x= 0-3. For CSC, a clear sol was prepared from Du Pont colloidal silica, Ludox AS-40®, aluminium nitrate nonahydrate, and calcium nitrate hexahydrate in proportions to form a final composition 1:2:40 composition.

A New Lithium Iron Phosphate LiFe2P3O10 Synthesized at 600 °C from Precursor Obtained by Wet Chemistry

2006 ◽  
Vol 972 ◽  
Author(s):  
Atmane Ait-Salah ◽  
Chintalapalle V Ramana ◽  
François Gendron ◽  
Jean-François Morhange ◽  
Alain Mauger ◽  
...  
Keyword(s):  
Lithium Iron Phosphate ◽  
Iron Phosphate ◽  
Voltage Range ◽  
Wet Chemistry ◽  
Cell Parameters ◽  
Antiferromagnetic Ordering ◽  
Chemical Technique ◽  
Wet Chemical ◽  
Wet Chemical Technique

AbstractWe present the synthesis and characterization of a novel lithium iron polyphosphate LiFe2P3O10 prepared by wet-chemical technique from nitrate precursors. The crystal system is shown to be monoclinic (P21/m space group) and the refined cell parameters are a=4.596 Å, b=8.566 Å, c=9.051 Å and β=97.46°. LiFe2P3O10 has a weak antiferromagnetic ordering below the Néel temperature TN=19 K. Electrochemical measurements carried out at 25 °C in lithium cell with LiPF6-EC-DEC electrolyte show a capacity 70 mAh/g in the voltage range 2.7-3.9 V.

Drop Solution Calorimetric Studies of Interface Enthalpy of Cubic Silver (I) Oxide (Ag2O) Nanocrystals

2021 ◽  
Vol 878 ◽  
pp. 73-80
Author(s):  
Khansaa Al-Essa ◽  
A V Radha ◽  
Alexandra Navrotsky
Keyword(s):  
Thermodynamic Cycle ◽  
Solution Calorimetry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Areas ◽  
Chemical Technique ◽  
Crystallite Sizes ◽  
Wet Chemical ◽  
Wet Chemical Technique ◽  
Calorimetric Studies

The nanoscale, cubic silver (I) oxide (Ag2O.nH2O) with different particles sizes and surface areas were synthesized by a wet chemical technique. The prepared crystallite size ranges were from (33.3±0.3 to 39.4±0.4 nm). Interface areas were estimated by comparing the surface areas measured by N2 adsorption to the crystallite sizes refined from X-ray diffraction data. The interface enthalpy of Ag2O.nH2O nanocrystal was measured using isothermal acid solution calorimetry in 25%HNO3 at 26°C. The interface enthalpy was verified by utilizing thermodynamic cycle. The enthalpies of drop solution (ΔHds) for Ag2O.nH2O are exothermic and range from (-62.228±0.197) to (-64.025±0.434 kJ/mol), while its interface enthalpy is (0.842±0.508 J/m2). This work provides the first calorimetric measurement of the interface enthalpy of nanocrystalline silver (I) oxide (Ag2O.nH2O).

DyCrxFe(1-x)O3 nanoparticles prepared by wet chemical technique for photocatalytic applications

2020 ◽  
Vol 46 (17) ◽  
pp. 26675-26681 ◽  
Author(s):  
Hira ◽  
Aysha Daud ◽  
Sonia Zulfiqar ◽  
Philips O. Agboola ◽  
Imran Shakir ◽  
...  
Keyword(s):  
Chemical Technique ◽  
Wet Chemical ◽  
Wet Chemical Technique ◽  
Photocatalytic Applications

scholarly journals Synthesis of poly(vinyl alcohol) — hydroxyapatite composites and characterization of their bioactivity

2013 ◽  
Vol 11 (9) ◽  
pp. 1403-1411 ◽  
Author(s):  
Zuzana Balgová ◽  
Martin Palou ◽  
Jaromír Wasserbauer ◽  
Jana Kozánková
Keyword(s):  
Vinyl Alcohol ◽  
Sol Gel ◽  
Calcium Nitrate ◽  
Weight Percent ◽  
Poly Vinyl Alcohol ◽  
Aqueous Environment ◽  
Calcium Nitrate Tetrahydrate ◽  
In Vitro Bioactivity ◽  
Before And After

AbstractAbstract A series of poly(vinyl alcohol) membranes reinforced with hydroxyapatite in various weight percent — 0%, 10%, 20%, 30%, 40% and 50% were prepared. Hydroxyapatite was prepared by a sol-gel procedure using diammonium hydrogen phosphate and calcium nitrate tetrahydrate as starting materials in an alkaline aqueous environment and then mixed with a solution of poly(vinyl alcohol), which was prepared by dissolving it in water at 85°C. The different mixtures were cast in a mould and evaporated for 7 days at a temperature of 30°C to obtain 1 mm thin membranes. FTIR spectroscopy was used to identify the different functional groups in the composites. The surface morphology was examined using a scanning electron microscope. In vitro bioactivity tests in Simulated Blood Fluid were performed for up to 28 days, especially for the membrane containing 50 wt.% HA. SEM was used to characterise the surface microstructure of biocomposite membranes before and after soaking in SBF. It was observed that the formation of clusters in membranes increases with increasing amount of HA. The clusters are formed due to agglomeration and crystal growth of HA particles during drying of the membranes. The in vitro bioactivity was found to increase with soaking time of biocomposite materials in simulated blood fluid. Graphical abstract

The Determination of Iron in Used Lubricating Oil

1971 ◽  
Vol 25 (6) ◽  
pp. 668-671 ◽  
Author(s):  
Gerald S. Golden
Keyword(s):  
Internal Standard ◽  
Rotating Disk ◽  
Lubricating Oil ◽  
X Ray ◽  
Chemical Technique ◽  
Used Lubricating Oil ◽  
Wet Chemical ◽  
Wet Chemical Technique ◽  
Instrumental Methods

Iron analyses performed on used gas turbine lubricating oil samples by several variations of rotating disk–spark emission spectrography, atomic absorptiometry, and x-ray fluorescence spectrometry are compared with a quantitative wet chemical technique. The results indicate that emission spectrography with a cobalt internal standard, atomic absorptiometry with a nitrous oxide–acetylene flame, and x-ray fluorescence, both dispersive and nondispersive, are the most reliable instrumental methods. The iron contained in the samples exists primarily as particulates 1 µ or less in diameter.

A novel approach towards hydrazine sensor development using SrO·CNT nanocomposites

RSC Advances ◽  
2016 ◽  
Vol 6 (70) ◽  
pp. 65338-65348 ◽  
Author(s):  
Mohammed M. Rahman ◽  
Mohammad Musarraf Hussain ◽  
Abdullah M. Asiri
Keyword(s):  
Carbon Nanotube ◽  
Low Temperature ◽  
Strontium Oxide ◽  
Sensor Development ◽  
Novel Approach ◽  
Chemical Technique ◽  
Wet Chemical ◽  
Oxide Nanoparticle ◽  
Wet Chemical Technique ◽  
Hydrazine Sensor

Strontium oxide nanoparticle decorated carbon nanotube nanocomposites (SrO·CNT NCs) were prepared in alkaline medium using a wet-chemical technique at low temperature.

scholarly journals Deposition of Cell Culture Coatings Using a Cold Plasma Deposition Method

2020 ◽  
Vol 10 (19) ◽  
pp. 6670
Author(s):  
Denis O’Sullivan ◽  
Hazel McArdle ◽  
Sing Wei Ng ◽  
Paula Bourke ◽  
Robert Forster ◽  
...  
Keyword(s):  
Thin Films ◽  
Cell Culture ◽  
Cold Plasma ◽  
Cell Activity ◽  
Single Step ◽  
Cell Culture Techniques ◽  
Culture Techniques ◽  
Chemical Technique ◽  
Wet Chemical ◽  
Wet Chemical Technique

Collagen coatings were applied onto polystyrene microplates using a cold atmospheric pressure plasma process. The coatings were compared to standard wet chemical collagen thin films using microscopy, surface energy, infra-red spectroscopy, electrophoresis, and cell culture techniques. Thin films were also deposited on gold electrodes using both coating methods and their structural and barrier properties probed using cyclic voltammetry. While the wet chemical technique produced a thicker deposit, both films appear equivalent in terms of coverage, porosity, structure, and chemistry. Significantly, the cold plasma method preserves both the primary and secondary structure of the protein and this results in high biocompatibility and cell activity that is at least equivalent to the standard wet chemical technique. The significance of these results is discussed in relation to the benefits of a single step plasma coating in comparison to the traditional multi-step aseptic coating technique.

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