Temat: temkin - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Inhibition and adsorption of oil extract of Balanites aegyptiaca seeds on the corrosion of mild steel in hydrochloric acid environment
Autorzy:: Iroha, Nkem B.
Hamilton-Amachree, Akens
Powiązania:: https://bibliotekanauki.pl/articles/1075452.pdf
Data publikacji:: 2019
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Balanites aegyptiaca
Mild steel
Temkin adsorption isotherm
corrosion
inhibition
Opis:: The efficiency of oil extract of Balanites aegyptiaca seeds on the inhibition of mild steel corrosion in 1 M HCl has been investigated using gravimetric and electrochemical (Potentiodynamic Polarization (PDP) and Electrochemical Impedance Spectroscopy (EIS)) techniques. Results obtained show that Balanites aegyptiaca (BA) oil extract inhibited the acid corrosion of mild steel. Polarization technique showed that BA oil extract acted as mixed-type inhibitor in 1 M HCl solution. The impedance technique reveals that charge-transfer process controls the corrosion of mild steel. The inhibiting action of BA oil extract was attributed to their adsorption on the mild steel surface and the formation of dense protective layer which increased by increasing their concentration. BA inhibits the corrosion of mild steel by an adsorption mechanism, which follows Temkin adsorption isotherm. Physical adsorption mechanism has been proposed for the inhibitory action of BA oil extract. The protective film formed on the surface was confirmed by scanning electron microscopy (SEM).
Źródło:: World Scientific News; 2019, 126; 183-197
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Analytical kinetic block model of crystal-mother-phase multilayer interface
Analityczny kinetyczny model blokowy wielowarstwowej granicy faz kryształ-faza macierzysta
Autorzy:: Organiściak, M.
Izdebski, M.
Ledzion, R.
Powiązania:: https://bibliotekanauki.pl/articles/296611.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Łódzka. Wydawnictwo Politechniki Łódzkiej
Tematy:: crystal-mother-phase interface
Temkin’s model
kinetic block model
Bragg-Williams approximation
kryształ-faza macierzysta
model Temkina
kinetyczny model blokowy
przybliżenie Bragga-Williamsa
Opis:: Simple kinetic block model of multilayer crystal-mother-phase interface is proposed. The model leads to a system of differential equations which can be solved without the need to run Monte Carlo simulations. The proposed model is based on Bragg-Williams approximation (called also zeroth-order approximation), "solid-on-solid" assumption, and other assumptions common with thermodynamic Temkin model. Thus, it is possible to test the compliance of kinetic and thermodynamic approaches in a situation where all other significant differences between models are eliminated. Moreover, a comparison with the results of kinetic Monte Carlo simulations allows for better understanding of the impact of Bragg-Williams approximation.
Zaproponowano prosty kinetyczny blokowy model wielowarstwowej granicy faz kryształ-faza macierzysta. Model ten prowadzi do układu równań różniczkowych, które rozwiązuje się bez potrzeby przeprowadzania symulacji Monte Carlo. Zaproponowany model wykorzystuje przybliżenie Bragga-Williamsa (zwane także przybliżeniem zerowego rzędu), założenie znane w literaturze jako „solid-on-solid” oraz inne założenia wspólne z termodynamicznym modelem Temkina, co umożliwia sprawdzenie zgodności podejścia kinetycznego i termodynamicznego w sytuacji gdy nie występują inne istotne różnice pomiędzy modelami. Ponadto porównanie zaproponowanego modelu z kinetycznymi symulacjami Monte Carlo umożliwia lepsze zrozumienie znaczenia przybliżenia Bragga-Williamsa.
Źródło:: Scientific Bulletin. Physics / Technical University of Łódź; 2015, 36; 64-75
1505-1013
2449-982X
Pojawia się w:: Scientific Bulletin. Physics / Technical University of Łódź
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Enhancing adsorption capacity of clay and application in dye removal from waste water
Autorzy:: Ogunmodede, O. T.
Adebayo, O. L
Ojo, A. A.
Powiązania:: https://bibliotekanauki.pl/articles/412039.pdf
Data publikacji:: 2014
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: snail shell
methylene blue
natural clay
langmuir
freundlich
temkin
Halsey and Harkins-Jura isotherm equations
Opis:: Natural clay has been considered as a potential absorbent for removing pollutants from water and waste water. Nonetheless, the effective application of clay for water treatment is limited due to small surface area and presence of net negative surface charge, leading to it low adsorption capacity. The absorption capacity was boosted via intercalation of CaO derived from snail shell (SS). The methylene blue sorption potential, PZC, and the surface area of unmodified clay sample were substantially enhanced by the intercalation process. The process of sorption of MB from solution was analyzed using five different isotherm models (Langmuir, Freundlich, Temkin, Harkins-Jura, and Halsey isotherm equations). The value of the Langmuir monolayer sorption capacity qm (mg/g) increased from 50.12 to 88.71, PZC values increased from 4.50 to 7.40, and the surface area (m2/g) value increased from 27 m2/g to 123 m2/g after the intercalation process. The experimental data were fitted into two kinetic models: Lagergren pseudo-first order and the chemisorptions pseudo-second order. It was observed that chemisorptions pseudo-second order kinetic model described the sorption process with high coefficients of determination (r2) better than pseudo first other kinetic models. The modification caused no change in the clay surficial microstructure but increased the lattice spacing of the clay framework.
Źródło:: International Letters of Chemistry, Physics and Astronomy; 2014, 20, 1; 35-51
2299-3843
Pojawia się w:: International Letters of Chemistry, Physics and Astronomy
Dostawca treści:: Biblioteka Nauki