A systematic experimental and modeling study of water adsorption/desorption behavior in organic-rich shale with different particle sizes

2021 ◽  
pp. 130596
Author(s):  
Wei Dang ◽  
Shu Jiang ◽  
Jinchuan Zhang ◽  
Pei Li ◽  
Haikuan Nie ◽  
...  
Keyword(s):  
Water Adsorption ◽  
Particle Sizes ◽  
Adsorption Desorption ◽  
Modeling Study

scholarly journals Adsorption of malic acid at the hydroxyapatite/aqueous NaCl solution interface

2021 ◽  
Author(s):  
Władysław Janusz ◽  
Ewa Skwarek
Keyword(s):  
Zeta Potential ◽  
Malic Acid ◽  
Particle Sizes ◽  
Nacl Solution ◽  
X Ray Diffraction ◽  
Radioisotope Method ◽  
X Ray ◽  
Solution Interface ◽  
Adsorption Desorption ◽  
Kinetics Of

AbstractThe aim of the study was the basic incidence on the phenomenon of adsorption that occurs at the hydroxyapatite/malic acid interface, leading to a change in the surface properties of hydroxyapatite, Analytical methods used in the research: X-ray diffraction (XRD) as well as by the, adsorption–desorption of nitrogen (ASAP), potentiometric titration. The specific adsorption of malic acid ions at the hydroxyapatite interface was investigated by means of the radioisotope method. The zeta potential of hydroxyapatite dispersions was determined by electrophoresis with Zetasizer Nano ZS90 by Malvern. The particle sizes of hydroxyapatite samples were analyzed using Masteriszer 2000 Malvern. Studies on the kinetics of malic acid on hydroxyapatite from a solution with an initial concentration of 1 mmol/dm3 have shown that the adsorption process is initially fast, followed by a slow adsorption step. An increase in the pH of the solution causes a decrease in the malic acid adsorption as a result of competition with hydroxyl ions. The presence of adsorbed malic acid was confirmed by the FTIR measurements. The effect of malic acid adsorption on the zeta potential and particle size distribution of hydroxyapatite in the NaCl solution was investigated.

Mixed-Solvothermal Synthesis of MIL-101(Cr) and Its Water Adsorption/Desorption Performance

2019 ◽  
Vol 58 (8) ◽  
pp. 2983-2990 ◽  
Author(s):  
Bingqiong Tan ◽  
Yanshu Luo ◽  
Xianghui Liang ◽  
Shuangfeng Wang ◽  
Xuenong Gao ◽  
...  
Keyword(s):  
Solvothermal Synthesis ◽  
Water Adsorption ◽  
Adsorption Desorption

Effects of Carbonation on the Specific Surface BET of Cement Mortar Measured by Two Different Methods: Nitrogen Adsorption and Water Adsorption

2014 ◽  
Vol 931-932 ◽  
pp. 421-425 ◽  
Author(s):  
Son Tung Pham ◽  
William Prince
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Water Adsorption ◽  
Cement Mortar ◽  
Nitrogen Adsorption ◽  
Accelerated Carbonation ◽  
Molecular Sizes ◽  
The Difference ◽  
Adsorption Desorption

The objective of this work was to examine the microstructural changes caused by the carbonation of normal mortar. Samples were prepared and subjected to accelerated carbonation at 20°C, 65% relative humidity and 20% CO2concentration. The evolutions of the pore size distribution and the specific surface area during carbonation were calculated from the adsorption - desorption isotherms of water vapour and nitrogen. Conflicts observed in the results showed that the porous domains explored by these two methods are not the same due to the difference in molecular sizes of nitrogen and water. These two techniques therefore help to complementarily evaluate the effects of carbonation. The study also helped to explain why results in the literature diverge greatly on the influence of carbonation on specific surface area.

Facilitating role of Pd for hydrogen, oxygen and water adsorption/desorption processes from bulk CeO2 and CeO2/γ-Al2O3

2019 ◽  
Vol 323 ◽  
pp. 141-147 ◽  
Author(s):  
Deniz Kaya ◽  
Dheerendra Singh ◽  
Serkan Kincal ◽  
Deniz Uner
Keyword(s):  
Water Adsorption ◽  
Adsorption Desorption

scholarly journals Pore Size-Dependent Structure of Confined Water in Mesoporous Silica Films from Water Adsorption/Desorption Using ATR–FTIR Spectroscopy

Langmuir ◽  
2019 ◽  
Vol 35 (37) ◽  
pp. 11986-11994 ◽  
Author(s):  
Bettina Baumgartner ◽  
Jakob Hayden ◽  
Jérôme Loizillon ◽  
Sophia Steinbacher ◽  
David Grosso ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Ftir Spectroscopy ◽  
Pore Size ◽  
Water Adsorption ◽  
Confined Water ◽  
Silica Films ◽  
Size Dependent ◽  
Adsorption Desorption

Effect of 300 and 500 MPa pressure treatments on starch–water adsorption/desorption isotherms and hysteresis

2014 ◽  
Vol 34 (4) ◽  
pp. 452-459 ◽  
Author(s):  
Mauro D. Santos ◽  
Pedro Cunha ◽  
Rui P. Queirós ◽  
Liliana G. Fidalgo ◽  
Ivonne Delgadillo ◽  
...  
Keyword(s):  
Water Adsorption ◽  
Desorption Isotherms ◽  
Adsorption Desorption

Changes in Water Adsorption Desorption Isotherms of Cement Mortars Caused by Carbonation Coupled with Humidification-Drying Cycles

2014 ◽  
Vol 989-994 ◽  
pp. 705-709
Author(s):  
Tung Pham Son
Keyword(s):  
Water Adsorption ◽  
Coupling Effect ◽  
Adsorbed Water ◽  
Water Vapor Adsorption ◽  
Adsorption Method ◽  
Cement Mortars ◽  
Pore Size Distributions ◽  
Low Humidity ◽  
Desorption Isotherms ◽  
Adsorption Desorption

The objective of this work was to examine the influence of carbonation on the water vapor adsorption desorption isotherms of cement materials. Two types of Portland mortars, which were CEM I and CEM II, were carbonated at 20°C, 65% relative humidity and 20% of CO2concentration. The pore size distributions were determined from the water adsorption method. We also studied the coupling effect between carbonation and humidification-drying cycles. The results showed a reduction in microporosity and a small increase in the mesoporosity. The pores clogging due to formation of calcium carbonate was highlighted by the reduction of the quantity of adsorbed water and the decrease in the hysteresis isotherms. The results of this study also indicated that the humidification-drying cycles coincide only from the second cycle because of a difficult evacuation of water during desorption, even at low humidity.

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