Wszystkie pola: acid - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Comparing cyclohexyl hydroxamic acid and benzohydroxamic acid in cassiterite flotation under lead nitrate activation
Autorzy:: Yang, Hao
Ou, Leming
Powiązania:: https://bibliotekanauki.pl/articles/27323645.pdf
Data publikacji:: 2023
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: adsorption
cassiterite
flotation
lead nitrate
cyclohexyl hydroxamic acid
Opis:: This paper investigates the flotation behavior of Cyclohexyl hydroxamic acid (CHA) and benzhydroxamic acid (BHA) on cassiterite under lead nitrate activation conditions and elucidates the adsorption mechanism of CHA on the cassiterite surface. Microflotation experiments were performed to compare the capturing efficiency of CHA and BHA at pH values ranging from 4 to 12. Results showed that CHA exhibited superior capability in capturing cassiterite compared to BHA. The recovery of cassiterite in the hydroxamic acid-based flotation system correlated positively with the adsorption of hydroxamic acid on the cassiterite surface. Adsorption experiments revealed an increase in adsorption quantity with an increase in hydroxamic acid dosage, with CHA exhibiting significantly higher adsorption amount than BHA on the cassiterite surface. To analyze the adsorption mechanism of CHA on the cassiterite surface, both infrared spectroscopy and X-ray photoelectron spectroscopy (XPS) analysis were conducted, both before and after lead nitrate activation. IR spectra and XPS results indicated that lead ion activation enhanced the adsorption of CHA on the cassiterite surface, resulting in an increased number of active sites for CHA interaction. Additionally, chemisorption of CHA occurred on the cassiterite surface.
Źródło:: Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 174673
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Assessing influence of hydrochloric acid leaching on structural changes and bleaching performance of Nigerian clay from Udi
Autorzy:: Ajemba, R. O.
Onukwuli, O. D.
Powiązania:: https://bibliotekanauki.pl/articles/110317.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: acid leaching
adsorption
bleaching
hydrochloric acid
isotherm
Opis:: Clay from Udi in Nigeria was mined, ground, and acid-leached at different concentrations of hydrochloric acid to produce adsorbents of varying properties. The raw and acid-leached samples were characterized using x-ray fluorescence (XRF) and Fourier transforms infra-red spectroscopy (FTIR) to examine the structural modifications in the clay as a result of acid-leaching. The analysis showed that the acid-leaching process caused several modifications of the clay samples. The surface area, Si/[Al + Fe + Mg] ratio, adsorption capacity were found to have increased in the acid-leached samples. The acid-leached samples were tested in order to ascertain their performance in bleaching palm oil and it was observed that the bleaching efficiency increased from 29.8% to 66.7%. The acid-leached sample prepared with 7M hydrochloric acid yielded an adsorbent that was efficient in bleaching palm oil under the experimental conditions. The isotherm analysis showed that the bleaching process followed the Freundlich equation.
Źródło:: Physicochemical Problems of Mineral Processing; 2014, 50, 1; 349-358
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Removal of lead ions from acid aqueous solutions and acid mine drainage using zeolite bearing tuff
Autorzy:: Zendelska, A.
Golomeova, M.
Golomeov, B.
Krstev, B.
Powiązania:: https://bibliotekanauki.pl/articles/204844.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: adsorption
acid mine drainage
zeolite bearing tuff
lead ions
equilibrium studies
Sasa mine
Opis:: The adsorption of lead ions onto a zeolite bearing tuff (stilbite) from synthetic acid aqueous solution and acid mine drainage taken from Sasa mine, Macedonia, is elaborated in this paper. The results present that adsorption occurs efficiently in both of cases. The physical and chemical properties of the used natural material, zeolite bearing tuff, are characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy. The concentration of metal ions in solution before and after treatment is obtained by AES-ICP. The effectivity of zeolite bearing tuff is determined through a series of experiments under batch conditions from single ion solutions, whereby the main parameters are the effects of initial pH of solution, mass of adsorbent, initial metal concentration in solution, contacting time and competing cations. The maximum capacity of zeolite bearing tuff for removal of lead ions from solution is determined by equilibrium studies. The experimental obtained data are fitted with Freundlich and Langmuir adsorption models. The experimental data are better fitted with Langmuir adsorption isotherm. Zeolite bearing tuff is effective adsorbent for treating acid mine drainage. The results showed that 99% of lead ions are removed from acid mine drainage, i.e. the concentration of lead ions from 0.329 mg/dm3 decrease to 0.002 mg/dm3. The pH value of acid mine drainage from 3.90 after treatment with zeolite bearing tuff increases to 5.36.
Źródło:: Archives of Environmental Protection; 2018, 44, 1; 87-96
2083-4772
2083-4810
Pojawia się w:: Archives of Environmental Protection
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Adsorption Behavior of Glucuronic Acid on Pyrite Surface: an electrochemical and DFT Study
Autorzy:: Ning, Xu Jia
Ying, Yang Hong
Lin, Tong-Lin
Powiązania:: https://bibliotekanauki.pl/articles/355049.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: glucuronic acid
pyrite
adsorption
Opis:: Bacterial adsorption on mineral surface is one of the key steps in bioleaching process. The bacteria adsorb on the mineral surface via the extracellular polymeric substances (EPS) layer. In this paper, the behavior of glucuronic acid, one of the key substances in EPS layer, adsorbed on the pyrite surface is studied using DFT and electrochemical methods. Adsorption capacity of glucuronic acid is stronger than that of water. Glucuronic acid adsorbs on pyrite surfaces and it follows a mixed type of interactions (physisorption and chemisorption). Adsorption of glucuronic acid on pyrite surface followed Langmuir’s adsorption isotherm with adsorption standard free energy of –27.67kJ mol^-1. The structural and electronic parameters were calculated and discussed.
Źródło:: Archives of Metallurgy and Materials; 2020, 65, 1; 433-440
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Active Physical Remediation of Acid Mine Drainage: Technologies Review and Perspectives
Autorzy:: Mulopo, Jean
Powiązania:: https://bibliotekanauki.pl/articles/2105273.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: ion-exchange
acid mine drainage
electrochemical
adsorption
membrane process
active physical treatment
Opis:: The successful acid mine drainage (AMD) treatment needs site-specific installation and implementation, as well as the deployment of technology that is compatible with the pollutants contained in the AMD. If key by-products of the AMD can be recovered, the financial sustainability of the AMD remediation method may be greatly improved. Additional research into novel and innovative solutions is necessary to advance in this direction. To accomplish this, it is necessary to have a complete awareness of current remediation technologies that are available and accessible. Active physical treatment methods such as ion exchange, adsorption, electrochemistry, and membrane techniques were examined in this article. Membrane technology excels in terms of ease of use, versatility, and environmental effect but produces brine streams the management of which remains vital for future adoption of the technology. Liquid membranes (LM), Micellar Enhanced Ultra-Filtration (MEUF), and Polyelectrolyte Enhanced Ultra-Filtration (PEUF) are all innovative membrane technologies that may provide some possibilities for metal recovery from chemical sludge and/or brine streams. Electrochemical technologies are considered an attractive alternative for AMD treatment, because they require only electricity as a consumable and can treat AMD to high standards by removing metals via (co)precipitation and sulfate via ionic migration (when an anion-exchange membrane is used in the configuration), while producing significantly less sludge. However, the accepted shortcomings include membrane/electrode fouling produced by (co)precipitates on the active surfaces necessary for the process, a lack of understanding regarding the effective scaling up to industrial scale, and the relatively expensive capital expenditure (CAPEX) required. The removal of heavy metals from AMD effluents by adsorption has a number of technical and environmental benefits, including high efficiency, and environmental friendliness. Despite its benefits, this technique has certain hurdles, such as the production process for low-cost adsorbents.
Źródło:: Journal of Ecological Engineering; 2022, 23, 6; 148--163
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The behaviour of tannic acid adsorption on fluorite surface: isotherm, kinetic and thermodynamic studies
Autorzy:: Tangarfa, Mariam
Semlali Aouragh Hassan, Naoul
Powiązania:: https://bibliotekanauki.pl/articles/2146850.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: fluorite
tannic acid
adsorption
kinetic
modelling
isotherm
thermodynamics
reactional parameters
Opis:: Fluorite is an important mineral to produce hydrofluoric acid. As fluorite resources contain calcite as a gangue mineral, the separation between these two calcium containing minerals is difficult. Tannic acid is the most commonly used reagent as a depressant to separate fluorite from calcite by flotation. To enhance this separation, it is so primordial to understand tannic acid physicochemical reactivity via these minerals. Therefore, the aim of this work is to investigate the mechanism of tannic acid adsorption on the fluorite surface by experimental study using isotherm, kinetic and thermodynamic. Adsorption isotherm modelling results showed that the adsorption process is well described by Sips model. On the other hand, the kinetic and thermodynamic require firstly the adsorption study as a function of three main reactional parameters including initial tannic acid concentration, solution pH and temperature. This study showed that acidic pH as well as initial tannic acid concentration increase and temperature decrease promote the studied adsorption. These finding were then exploited to determine the adsorption mechanism by pseudo n order kinetic model adjustment to experimental kinetic data using nonlinear regression method. Obtained high correlation coefficient and low mean absolute error at 95 % confidence level showed good agreement of experimental kinetic data with the tested model. These results revealed that the mechanism of tannic acid adsorption onto fluorite was attributed to a chemical reaction. In addition, the thermodynamic study showed that the studied adsorption process was exothermic.
Źródło:: Physicochemical Problems of Mineral Processing; 2022, 58, 1; 77--87
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Modification of Polyacrylamide-β-Zeolite Composite by Phytic Acid for the Removal of Lead from Aqueous Solutions
Autorzy:: Faghihian, H.
Farsani, S.N.
Powiązania:: https://bibliotekanauki.pl/articles/779338.pdf
Data publikacji:: 2013
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: adsorption
lead
composite
polyacrylamide
phytic acid
Opis:: Polyacrylamide-zeolite composite was prepared by direct polymerization of polyacrylamide in suspension of β-zeolite. Phytic acid was then immobilized on the composite surface. Fourier transform infrared spektrometry (FT-IR), X-Ray Diffraction (XRD) and Thermal gravimetry (TG) techniques were employed to characterize the synthesized adsorbent. The adsorptive features of the composite and the modifi Ed composite were investigated for the removal of Pb2+ from aqueous solution in view of dependency on pH, time, ion concentration, temperature, selectivity, kinetics and reusability. The adsorption isotherms were evaluated with reference to the Langmuir and Freundlich models. Thermodynamic of the system was calculated. ΔG<0 indicated that the adsorption process was spontaneous. Good compatibility of the adsorption kinetics to the pseudo-second-order model predicted that the rate-controlling step was a chemical sorption. The selectivity experiments showed that the adsorbents were selective toward Pb2+ In the presence of Zn2+ and Cd2+. The reusability of the adsorbent was tested for four regeneration cycles.
Źródło:: Polish Journal of Chemical Technology; 2013, 15, 1; 1-6
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Lactobacillus casei cell immobilisation on mineral carriers for continuous lactic acid production
Autorzy:: Kowalska, Urszula
Mizielińska, Małgorzata
Łopusiewicz, Łukasz
Bartkowiak, Artur
Powiązania:: https://bibliotekanauki.pl/articles/1178777.pdf
Data publikacji:: 2017
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Lactobacillus casei
adsorption
biofilm
continuous production
immobilisation
lactic acid
mineral carriers
Opis:: The first purpose of the study was to evaluate the influence of incubation parameters for efficiency of bacterial adhesion on surface of three solid, mineral porous carriers. Second aim of the study was the use of the immobilized Lactobacillus casei cells, in the production of lactic acid and selection, best carriers for continuous production using column bioreactor. The results showed that bacterial adhesion was different depending on the incubation conditions. In all tested samples, the highest efficiency of bacterial adhesion achieved after incubation at 30 °C without shaking which was related to bacterial viability. The results showed that, the highest efficiency of lactic acid production by free cells has been obtained at 30 °C after 48h – 110% (w/w) (lactic acid yield from consumed glucose). This results have been confirmed by further tests which have shown that in stationary culture, the highest production of lactic acid was reached by immobilised bacteria cells on pumice and kermiste after 48 hours at 30 °C.
Źródło:: World Scientific News; 2017, 90; 62-76
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Adsorption of humic acid on mesoporous carbons prepared from poly- (ethylene terephthalate) templated with magnesium compounds
Autorzy:: Karolczyk, J.
Mozia, S.
Morawski, A.W.
Przepiórski, J.
Powiązania:: https://bibliotekanauki.pl/articles/778949.pdf
Data publikacji:: 2012
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: porous carbon
adsorption
humic acid
fluorescence spectroscopy
Opis:: Porous carbons obtained from poly(ethylene terephtalate) contained in a mixture with either MgCO3 or Mg(OH)2 were examined as adsorbents for removal of humic acid from water. Adsorption of the model contaminants is discussed in relation to the textural parameters of the obtained carbon materials. Pore structure parameters of the carbonaceous materials were strongly influenced by preparation conditions including temperature and relative amounts of the inorganics used during preparations as template. Porous carbons prepared revealed a potential to purify water from the model contaminant of high molecular weight. The results presented confirmed a key role of mesoporosity in the adsorption of humic acid. Fluorescence spectroscopy was confirmed to be an useful method to evaluate concentration of humic acid in water.
Źródło:: Polish Journal of Chemical Technology; 2012, 14, 4; 95-99
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Adsorption of sodium/calcium poly(acrylic acid) salts on anatase: effect of the polyelectrolyte molecular weight and neutralization
Autorzy:: Jacquemet, Christian
Powiązania:: https://bibliotekanauki.pl/articles/1449765.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: adsorption
free energy
Langmuir isotherm
sodium-calcium poly(acrylic acid) salts
anatase
Opis:: Abstract: Interactions of poly(acrylic acid)s (PAAs) of two different molecular weights (Mw = 9,560 g×$mol^{-1}$ and 4,220 g×$mol^{-1}$) with surfaces of an untreated anatase $TiO_2$ were assessed through adsorption isotherm measurements. Those dispersants were tested under different sodium-calcium neutralization states (molar ratio $r = Ca^{2+}$ / $CO_{2-}$ varying from 0 to 0.35). Their behavior towards the $TiO_2$ surfaces can be described by the Langmuir adsorption model. For both polymers, surface coverage ($Γ_max$) evolves linearly with the molar ratio $r$. For a given r value, a lower surface coverage was observed with the polymer having the highest molecular weight. The free energy of adsorption ($/DeltaG_{ads}$) of PAAs was estimated from adsorption experiment data. This calculation indicates that sorption occurs spontaneously and is unlikely to be of chemical nature. The absolute values of $/DeltaG_{ads}$ are higher for the highest molecular weight polymers suggesting that they are more strongly adsorbed to anatase surfaces. The absolute values of $/DeltaG_{ads}$ per mole of sodium-calcium macromolecules are found to be lower than those calculated for their homologues 100% sodium neutralized suggesting that they are bound with the solid by a fewer number of segments.
Źródło:: Physicochemical Problems of Mineral Processing; 2020, 56, 1; 113-123
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Adsorption of rare earth metal ions on novel tripodal broom methylcarbamoylmethoxy-acetic acid impregnated resin
Autorzy:: Ohto, K.
Oshima, T.
Inoue, K.
Powiązania:: https://bibliotekanauki.pl/articles/346895.pdf
Data publikacji:: 2006
Wydawca:: Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:: tripodal broom compound
impregnated resin
adsorption
rare earth metals
methylcarbamoylmethoxy-acetic acid
Opis:: The novel broom methylcarbamoylmethoxy-acetic acid impregnated resin has been prepared to investigate the adsorption behavior of nine rare earth metals. The present resin demonstrates adsorption ability for rare earth metal ions. The selectivity order for rare earth series is as follows: Ho>Er>Gd>Y>Eu> Sm>>Nd>Pr>>La. This order is different from those of general carboxylic acid extractants. Maximum adsorption capacity of holmium is found to be 0.21 mol kg-1. From the comparison of the reagent amount impregnated in the resin and the maximum adsorption capacity, the adsorption stoichiometry is found to be 1:2 (Ho : reagent).
Źródło:: Ars Separatoria Acta; 2006, 4; 27-36
1731-6340
Pojawia się w:: Ars Separatoria Acta
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Synthesis of a novel hydroxamic acid flotation collector and its flotation separation of malachite against quartz
Autorzy:: Sun, Xin
Huang, Lingyun
Wu, Dandan
Hu, Bo
Zhang, Mei
Li, Yaming
Tong, Xiong
Powiązania:: https://bibliotekanauki.pl/articles/2146909.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: flotation
collector
malachite
hydroxamic acid
direct flotation
adsorption
Opis:: This paper proposes a promising chelating collector, phenyl propyl hydroxamic acid (BPHA), to directly float malachite for the separation of malachite against quartz. The flotation performance and mechanism was investigated via microflotation tests, as well as through contact angle, Scanning Electron Microscopeand Energy Dispersive Spectrometer (SEM–EDS), zeta potential, adsorption capacity, Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS) analyses. The results of microflotation tests showed that BPHA has a strong ability to collect malachite and a significant selectivity against quartz. The contact angle tests showed that BPHA effectively adsorbed onto the mineral surface and could improve the hydrophobicity of the malachite surface. SEM–EDS and adsorption capacity analyses further indicated that BPHA adsorbed onto the surface of malachite. The FR-IR results suggested that BPHA could react with Cu2+ ions and facilitate strong chemical adsorption onto the surface of malachite. Furthermore, zeta potential and XPS analyses provided clear evidence that BPHA exhibited a stronger affinity for malachite and a weaker interaction with quartz.
Źródło:: Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 149427
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Wpływ zmian pH i temperatury na proces adsorpcji kwasu salicylowego na przemysłowych węglach aktywnych
The Effect of pH and Temperature on Adsorption of Salicylic Acid for Industrial Activated Carbons
Autorzy:: Szymonik, A.
Lach, J.
Powiązania:: https://bibliotekanauki.pl/articles/297724.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: adsorpcja
węgiel aktywny
kwas salicylowy
adsorption
activated carbon
salicylic acid
Opis:: Przeprowadzono badania nad sorpcją kwasu salicylowego z roztworów wodnych na przemysłowych węglach aktywnych WG-12 i ROW-08. Wykazano, że wielkość adsorpcji na poszczególnych węglach aktywnych zależy od pH i temperatury roztworu, z którego są sorbowane. Najistotniejsze znaczenie ma wartość pH roztworu, która decyduje o stopniu jonizacji cząsteczek kwasu. Najwięcej cząstek jest adsorbowanych przy niskich wartościach pH (pH = 2), w których kwas występuje w formie niezjonizowanej. Badania adsorpcji prowadzone w temperaturach 20 i 40°C świadczą o egzotermiczności procesu.
The article presents the results of the study on sorption of salicylic acid from water solutions on the selected industrial activated carbons: WG-12, ROW 08 and F-300. The highest efficiency of sorption was observed for the F-300 activated carbon. The efficiency of sorption on selected activated carbons depends on pH and temperature of the solution subjected to sorption. The highest number of particles was adsorbed at low values of pH (pH = 2) and at low temperature (20°C). With the increase in pH and temperature of the solution the efficiency of adsorption decreases.
Źródło:: Inżynieria i Ochrona Środowiska; 2013, 16, 3; 331-339
1505-3695
2391-7253
Pojawia się w:: Inżynieria i Ochrona Środowiska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Adsorption and inhibitive properties of methanol extract of Eeuphorbia Heterophylla for the corrosion of copper in 0.5 M nitric acid solutions
Autorzy:: Fouda, A. S.
Elmorsi, M. A.
Abou-Elmagd, B. S.
Powiązania:: https://bibliotekanauki.pl/articles/780024.pdf
Data publikacji:: 2017
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: acid corrosion
copper
green inhibitor
adsorption
kinetic parameters
Opis:: The adsorption and the inhibitive properties of methanol extract of Euphorbia heterophylla on copper in 0.5 M HNO₃ have been studied by weight loss method at different temperatures (30-50°C), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. Also, the surface morphology was analyzed by scanning electron microscopy (SEM). It was found that the inhibition efficiency increases with increasing extract doses and decreased with increasing temperature. The polarization data revealed that this extract acts as mixed type inhibitor. The adsorption process was more favored at lower temperatures with larger negative standard free energy. The extract was adsorbed physically on the copper surface followed Frumkin isotherm.
Źródło:: Polish Journal of Chemical Technology; 2017, 19, 1; 95-103
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Effect of polyacrylic acid molar mass as a surface modifier on rheological properties of calcium carbonate suspensions
Autorzy:: Selim, Khaled Abdelaal
Farghaly, Mohamed Galal
Abdallah, Samah Saleh
Abdel-Khalek, Mohamed Abdel-Dayem
Powiązania:: https://bibliotekanauki.pl/articles/1446411.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: calcium carbonate
surface modification
poly-acrylic acid
rheology
adsorption
Opis:: Suspensions of calcium carbonate are of a major concern in various fields, such as coating, painting and ceramics and their rheological properties are very important. The effect of polyacrylic acid (PAA) of different molecular mass as a surface modifier on the surface and rheological properties of the aqueous suspension of calcium carbonate was investigated. The effect of the volume fraction of particles and polymer concentration on the viscosity at lower shear rate was discussed. The flow behavior of the concentrated suspension in the presence of PAA can be explained by the difference of the repulsive force among particles, induced by the adsorbed polymer. The results showed that the dispersibility is more pronounced by the steric hindrance behavior rather than the electrostatic behavior.
Źródło:: Physicochemical Problems of Mineral Processing; 2021, 57, 4; 18-26
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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