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Wyszukujesz frazę "dynamic adsorption" wg kryterium: Temat


Wyświetlanie 1-5 z 5
Tytuł:
Influence of dynamic adsorption layer formation on bubble attachment to quartz and mica surfaces in solutions of pure and mixed surface-active substances
Autorzy:
Wiertel-Pochopień, A.
Zawala, J.
Powiązania:
https://bibliotekanauki.pl/articles/109361.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
quartz
bubble
mica
dynamic adsorption layer
wetting film
three-phase contact
Opis:
The paper presents systematic studies on influence of state of dynamic adsorption layer (DAL) induced at the rising bubble interface on time-scale of the bubble attachment to quartz and mica surfaces immersed in pure n-cetyl-trimethylammonium bromide (CTAB) and mixed octanol/CTAB solutions of different concentrations. It was found that in the case of pure CTAB solutions, the influence of DAL on time of bubble attachment and the three-phase contact (TPC) formation (tTPC) strongly depends on solution concentration. Generally, two solution concentration regimes were distinguished – low and high - for which different degree of solid surfaces hydrophobization was observed. It was determined that for low concentration regime the solid surface is only slightly hydrophobized while for high regime, hydrophobicity of the solid surface is much higher. Consequently, wetting film rupture for low concentration regime is governed by electrostatic interactions while for high concentration regime significance of these interactions is much smaller. As a result, the DAL influenced the film rupture in these two regimes in a quite different manner. For mixed n-octanol/CTAB solutions it was found that CTAB molecules presence is necessary condition for wetting film destabilization. Moreover, thanks to the developed approach, allowing control of initial adsorption coverage over the bubble surface (independently on concentration), it was proved that constant adsorption degree of CTAB molecules at the bubble surface in the mixture, leads to identical times of the TPC formation.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1083-1094
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ruch pęcherzyka w cieczach i fizykochemiczna metoda detekcji zanieczyszczeń powierzchniowo-aktywnych w wodzie
Bubble motion in liquids and physocochemcal method of detection of surface-active pollutants in water
Autorzy:
Zawała, Jan
Kosior, Dominik
Małysa, kazimierz
Powiązania:
https://bibliotekanauki.pl/articles/1853755.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
surfaktanty
micelizacja
krytyczne stężenie micelarne
ultrafiltracja micelarna
bubble
velocity
surfactant
drag coefficient
dynamic adsorption layer
Opis:
Motion of gas bubbles in aqueous phase (either clean water or solutions of surface-active substances) is a phenomenon of great practical importance. Gas/liquid contacting is one of the most common operations in the chemical and petrochemical industry and mineral processing In particular in mineral industry, for all kind of flotation processes it is the main act responsible for the success of the entire technology As a result, properties of the liquid/gas interfaces are considered as a one of the most important parameters, determining the outcome of industrial applications and engineering processes. These properties can be modified by surfactants which adsorption (molecules accumulation) at the interfaces leads to the decrease in the interfacial tension and modification of the hydrodynamic boundary conditions. Description of a single bubble motion in wide range of flow magnitude (Reynolds numbers) is not trivial and many attempts have been undertaken to quantify a bubble behavior in liquids. This paper presents a short overview of the current “state of arts” on physics of the bubble motion in liquids and the elaborated models, describing motion of the bubble formed in liquid phase. The comparison of the theoretical models predictions with the available experimental data is presented. It is shown, moreover, that the bubble velocity can be used as a very sensitive tool for detection of organic contaminations in environmental water samples.
Źródło:
Wiadomości Chemiczne; 2021, 75, 9-10; 1317-1342
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania adsorpcji wybranych barwników z roztworów wodnych na nanoporowatych materiałach węglowych w warunkach dynamicznych
Adsorption studies of selected dyes from aqueous solutions on nanoporous carbon materials under dynamic conditions
Autorzy:
Czubaszek, M.
Choma, J.
Powiązania:
https://bibliotekanauki.pl/articles/236812.pdf
Data publikacji:
2018
Wydawca:
Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
Tematy:
nanoporowate materiały węglowe
tlenek grafenu
prekursor polimerowy
miękkie odwzorowanie
adsorpcja dynamiczna
barwniki syntetyczne
oranż metylowy
oranż II
błękit metylenowy
krzywa przebicia złoża
nanoporous carbon material
graphene oxide
polymeric precursor
soft-template method
dynamic adsorption
synthetic dyes
methyl orange
orange II
methylene blue
breakthrough curve
Opis:
Badano adsorpcję dynamiczną trzech barwników: oranżu metylowego (OM), oranżu II (OII) i błękitu metylenowego (BM) z roztworów wodnych na czterech materiałach węglowych. Były to: zredukowany tlenek grafenu (rGO) otrzymany metodą chemiczną, mikroporowaty węgiel otrzymany z prekursora polimerowego – sulfonowanej żywicy styrenowo-diwinylobenzenowej (AC-SDVB), mezoporowaty, uporządkowany materiał węglowy otrzymany metodą miękkiego odwzorowania z żywicy fenolowo-formaldehydowej (OMC-PF) oraz handlowy węgiel aktywny (AC-F400). W dynamicznych badaniach kolumnowych wyznaczono krzywe przebicia tych adsorbentów, a do opisu krzywych przebicia złoża węgla wykorzystano równania Thomasa oraz Yoona-Nelsona. Uzyskane wartości adsorpcji dynamicznej barwników były duże, szczególnie w przypadku mikroporowatego węgla AC-SDVB oraz zredukowanego tlenku grafenu. Stwierdzono, że największą adsorpcją dynamiczną charakteryzował się zredukowany tlenek grafenu, który adsorbował oranż II w ilości 706 mg/g. Wykorzystane równania Thomasa i Yoona-Nelsona dobrze opisywały krzywe przebicia złoża węgla (R2=0,97÷0,99).
Dynamic adsorption of three dyes was studied: methyl orange (OM), orange II (OII) and methylene blue (MB) from aqueous solutions on four carbon materials. These were: reduced graphene oxide (rGO) obtained by the chemical method, microporous carbon prepared from a polymeric precursor – sulfonated styrene-divinyl benzene resin (AC-SDVB), ordered mesoporous carbon material obtained by soft templating from phenol-formaldehyde resin (OMC-PF) and the commercial activated carbon (AC-F400). Breakthrough curves for the above adsorbents were determined in dynamic column experiments and Thomas and Yoon-Nelson equations were used to describe them. Dynamic dye adsorption values were high, especially for AC-SDVB microporous activated carbon and reduced graphene oxide. The highest dynamic adsorption was demonstrated for the reduced graphene oxide, rGO, which adsorbed 706 mg/g of orange II. The equations of Thomas and Yoon-Nelson well described the breakthrough curves for the carbon bed with correlation coefficients R2 = 0,97÷0,99.
Źródło:
Ochrona Środowiska; 2018, 40, 3; 3-8
1230-6169
Pojawia się w:
Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A fundamental study of monovalent and divalent ions on froth properties in the presence of terpenic oil
Autorzy:
Li, Yubiao
Wang, Hongduo
Li, Wanqing
Song, Shaoxian
Powiązania:
https://bibliotekanauki.pl/articles/110301.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
surface tension
froth stability
dynamic foamability index
Gibbs adsorption isotherm
Opis:
In order to minimize fresh water usage, much attention has been paid to the flotation using saline or sea water. However, the effects of various ions in these waters on froth properties in flotation are not fully understood. In this study, the effects of electrolyte solutions containing NaCl, KCl, CaCl2, and MgCl2 at different concentrations in the presence of terpenic oil as a frother were investigated on froth performance, dynamic froth stability (DFS). It was found that KCl had the best synergistic effects with terpenic oil in reducing the solution surface tension. In the presence of terpenic oil, the DFS and half-life time were reduced with the increased ion concentration. Dynamics foamability index measurements (DFI) confirmed that the increased ion concentration increased the foamability, as frother did. In addition, Gibbs adsorption isotherm suggested that the amount of terpenic oil adsorbed at the gas-liquid interface was increased with the increased ion concentration. This study therefore indicated that the presence of ions can reduce the froth stability but not decline foamability due to terpenic oil, enlighting the application of saline or sea water in defoaming process in flotation.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 3; 643-654
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption of hexane and cyclohexane vapours at the water drop surface
Autorzy:
Miller, R.
Aksenenko, E. V.
Kovalchuk, V. I.
Tarasevich, Y. I.
Fainerman, V. B.
Powiązania:
https://bibliotekanauki.pl/articles/110244.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
water-heptane vapour interface
drop profile analysis tensiometry
dynamic surface tension
adsorption kinetics
Opis:
The dependence of the dynamic surface tension of water at the interface with saturated hexane and cyclohexane vapours was measured by the drop profile analysis method. The surface tension for the adsorption layers of cyclohexane at different temperatures was compared with the results reported earlier for the adsorption of hexane and other alkanes from the vapour phase on water drops. It is shown that cyclohexane is adsorbed significantly slower than the adsorption of hexane occurs, and is characterised by a much larger induction time. The error in the drop radius measurements at 40 ºC attains 45 m. The experimental rheologic characteristics of the adsorbed layers are studied and the results are compared with the model developed to describe an adsorption process governed by a kinetic mechanism.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 1; 54-62
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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