scholarly journals WATER ROLE IN THE GASES CHEMOSORPORATION PROCESSES BY SORPTION-ACTIVE MATERIALS

2021 ◽  
Vol 26 (3(79)) ◽  
pp. 6-26
Author(s):  
A. A.-A. Ennan ◽  
R. M. Dlubovskiy ◽  
R. E. Khoma
Keyword(s):  
Cation Exchanger ◽  
Free Water ◽  
Adsorbed Water ◽  
Active Centers ◽  
Active Materials ◽  
Anion Exchangers ◽  
Toxic Gases ◽  
Sulfonic Cation Exchanger ◽  
Basic Anion ◽  
Ir Spectroscopic

The work summarizes the literature data on the hydration and chemisorption of toxic gases by polymeric sorption-active materials. The mechanisms of absorption by granular and fibrous ion-exchange and impregnated materials and the state of adsorbed water have been studied using various research methods (gravimetric, sorption-thermochemical, derivatographic, IR spectroscopic). The regularities of the hydration processes of granular strongly acidic sulfonic cationexchangers of the brands KU‑2 and KU‑23 (macroporous analogue), fibrous strongly acidic sulfonic cation- exchanger VION KS‑3, fibrous weakly acid carboxylic cation exchanger VION KN‑1 in various ionic forms are considered. Among the anion exchangers, the hydration of granular strongly basic anion- exchangers of the brand AV‑17, granular weakly basic anionexchangers of the brands AN‑25 (AN‑251 macroporous analogue) and ANKB‑35, fibrous strongly basic anion- exchangers of the brands FIBAN A‑6 and FIBAN A‑12, fibrous medium basic anion- exchangers of the brands CM‑2, fibrous weakly basic anion- exchangers of the brands CM-A1, VION AN‑1, VION AN‑3, FIBAN A‑5, FIBAN A‑11 and FIBAN AK‑22 are considered. It has been established that, by nature, the bond with the active centers of water is derided into a «bound» and a ordiner – «free». The first one is a monolayer and the nearest bonded with the ion of the ball; the other is the osmotic swelling water. It has been shown that for the effective absorption of most toxic gases and vapors (SO2, HCl, Cl2, SiF4, HF, NO2, NH3, аміни, COCl2, O3), it is necessary to have «free» water, which is not only a diffusion medium in which mass transfer proceeds, but also is a direct participant in chemisorption.

scholarly journals Remazol Black B removal from aqueous solutions and wastewater using weakly basic anion exchange resins

2011 ◽  
Vol 9 (5) ◽  
pp. 867-876 ◽  
Author(s):  
Monika Wawrzkiewicz ◽  
Zbigniew Hubicki
Keyword(s):  
Anion Exchange ◽  
Phenol Formaldehyde ◽  
Reactive Dye ◽  
Anion Exchangers ◽  
Phase Contact Time ◽  
Anion Exchange Resins ◽  
Remazol Black B ◽  
Basic Anion ◽  
Exchange Resins ◽  
Remazol Black

AbstractIn this study, the use of the weakly basic anion exchange resins of phenol-formaldehyde (Amberlyst A 23), polyacrylate (Amberlite IRA 67) and polystyrene (Lewatit MonoPlus MP 62) matrices for removal of the reactive dye Remazol Black B (RBB) from aqueous solution and wastewater were investigated. RBB sorption on the anion exchangers was a time dependent process. Color reduction percentiles of 75.2, 33.9 and 25.1% in wastewater treatment were found after 216 h of phase contact time with Lewatit MonoPlus MP 62, Amberlyst A 23 and Amberlite IRA 67, respectively. Inorganic salts and anionic surfactant action influenced RBB uptake by the anion exchangers. The amounts of dye retained by the anion exchangers increased with a rise in temperature. The maximum sorption capacities calculated from the Langmuir model were 66.4, 282.1 and 796.1 mg g−1 for Amberlite IRA 67, Amberlyst A 23 and Lewatit MonoPlus MP 62, respectively. Regeneration of phenol-formaldehyde and polystyrene resins were possible using 1 M NaOH, 2 M KSCN, 1M KSCN in 40–60% methanol as well as 1 M NaOH in 60% methanol.

scholarly journals Investigation of the Effects of Adsorbed Water on Adhesion Energy and Nanostructure of Asphalt and Aggregate Surfaces Based on Molecular Dynamics Simulation

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2339 ◽  
Author(s):  
Wentian Cui ◽  
Wenke Huang ◽  
Bei Hu ◽  
Jiawen Xie ◽  
Zhicheng Xiao ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Relative Concentration ◽  
Asphalt Mixture ◽  
Free Water ◽  
Adsorbed Water ◽  
Adhesion Energy ◽  
Atomic Scale ◽  
Dynamics Simulation ◽  
Damage Resistance ◽  
Water Damage

The purpose of this study was to investigate the effect of aggregate surface adsorbed water on the adhesive capacity and nanostructure of asphalt-aggregate interfaces at the atomic scale. Molecular dynamics (MD) simulation was performed to measure and analyze the molecular interactions of asphalt binder with calcite and silica. Radial distribution function (RDF) and relative concentration (RC) were applied to characterizing the concentrations and distributions of asphalt components on aggregate surfaces. In addition, debonding energy and adhesion energy were employed to calculate the variations of interface adhesion energy of the asphalt-aggregate system under different conditions. The obtained results illustrated that the water molecules adsorbed onto the surface of weakly alkaline aggregates inhibited the concentration and distribution of asphalt components near the aggregate surface, decreased adhesion energy between asphalt and aggregates, and changed asphalt nanostructure. Especially, when external free water intruded into the interface of the asphalt-calcite system, the adsorbed water interacted with free water and seriously declined the water damage resistance of the asphalt mixture with limestone as an aggregate and decreased the durability of the mixtures. The water adsorbed onto the surface of the acid aggregate negatively affected the asphalt-silica interface system and slightly reduced the water damage resistance of the asphalt mixture.

Unforseen factors influencing Fe(III)-containing cations sorption on strongly basic anion exchangers

2008 ◽  
Vol 109 (4) ◽  
pp. 2643-2647 ◽  
Author(s):  
Vasile Gutsanu ◽  
Cristina Schitco ◽  
Raisa Drutsa
Keyword(s):  
Anion Exchangers ◽  
Factors Influencing ◽  
Basic Anion

scholarly journals The Effect of Graphene on the Protective Properties of Water-Based Epoxy Coatings on Al2024-T3

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
T. Monetta ◽  
A. Acquesta ◽  
A. Carangelo ◽  
F. Bellucci
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Free Water ◽  
Adsorbed Water ◽  
Polymerization Process ◽  
Protective Properties ◽  
Matrix Interaction ◽  
Graphene Nanoflakes ◽  
Water Based ◽  
Pathway Length

0.5 and 1% wt. of graphene nanoflakes were added to an anticorrosive additives-free water-based epoxy resin applied to Al2024-T3 samples. Calorimetric (DSC) and adhesion (cross-cut test) tests indicated that the presence of graphene did not affect the polymerization process of the resin or its adhesion to the substrate while it had some effect on its wettability. Electrochemical Impedance Spectroscopy (EIS) results obtained suggested that the addition of a small amount of graphene greatly enhanced the protective properties of the epoxy coating, retarding electrolytes absorption and reducing the total amount of adsorbed water. The latter occurrence suggests that the graphene effect on coating performances is related to both extended diffusion pathway length and graphene/matrix interaction due to the unique properties of graphene.

Kinetics and exchange behaviour of certain sulphur anions on strongly basic anion exchangers in aqueous KCl medium

1976 ◽  
Vol 30 (1) ◽  
pp. 93-102 ◽  
Author(s):  
A. A. Abdel-Rassoul ◽  
H. F. Aly ◽  
A. Borhan ◽  
M. M. Abdel-Hamid
Keyword(s):  
Anion Exchangers ◽  
Basic Anion ◽  
Exchange Behaviour

scholarly journals SELECTIVITY OF INTERPOLYMER SYSTEMS WITH RESPECT TO LANTHANUM IONS

2021 ◽  
Vol 73 (1) ◽  
pp. 88-94
Author(s):  
T.K. JUMADILOV ◽  
◽  
L.K. Yskak ◽  
B. TOTKHYSKYZY ◽  
N.Zh. ZHAMBYLBAY ◽  
...  
Keyword(s):  
Polymer Chain ◽  
Maximum Degree ◽  
Cation Exchanger ◽  
Sorption Activity ◽  
Polymer Hydrogels ◽  
Lanthanum Ions ◽  
Sulfonic Cation Exchanger ◽  
Remote Interaction ◽  
Degree Of Extraction ◽  
Degree Of Sorption

The paper deals with the sorption of lanthanum ions by an interpolymer system consisting of sulfonic cation exchanger KU2-8 and anion exchanger AV-17-8. To predict the sorption activity of the intergel system, the mutual activation of the KU2-8 sulfonic cationite with the AV-17-8 anionite in the aqueous medium was initially studied. Due to the mutual activation of hydrogels in the course of their remote interaction, the polymer macromolecules pass into a highly ionized state, which leads to a significant increase in the degree of extraction of lanthanum ions from polymer hydrogels in intergel vapors as compared to the initial polymers. We calculated the degree of extraction of lanthanum ions by the interpolymer system KU2-8: AV-17-8, the degree of binding of the polymer chain (in relation to lanthanum ions) with the initial ion exchangers and the interpolymer system KU2-8: AV-17-8. Based on the data obtained, a comparative analysis of the sorption of lanthanum ions by individual sorbents and an interpolymer system was carried out within the limits of the ratio KU2-8: AV-17-8 = 5: 1–1: 5. It has been established that the maximum degree of sorption of lanthanum ions by the KU2-8: AV-17-8 interpolymer system is observed within the ratio KU2-8: AV-17-8 = 2: 4 at 48 hours of remote interaction of the interpolymer system and is 54.73 mol. %, at which the degree of binding of the polymer chain is 6.15%

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