Претрага

Упит dcterms_subject_txt:Freundlich adsorption isotherm

56 items

  • Some examples of interactions between certain rare earth elements and soil

    Zlatko Nikolovski, Jelena Isailović, Dejan Jeremić, Sabina Kovač, Ilija Brčeski (2021)
    Freundlich adsorption isotherm, sequential extraction, metallic ions, ICP-OES
    ... of the most frequently used adsorption isotherms is the Freundlich (H. Freundlich) isotherm. Freundlich isotherm is used for describing the physical adsorption, being the consequence of the Van der Waals forces impact, it is reversible and there may come to adsorption of adsorbents in a number of ...
    ... ion adsorbed mass per mass of adsorbent on the equilibrium concentration of that ion in the solution- Freundlich adsorption isotherm. Parameters for adsorption intensity (n) and Freundlich isotherm constant (kf) are determined in the equation of the line, according to the equation (3). Also, the ...
    ... The equation of Freundlich adsorption isotherm is (2): q = kf c1 1/n (2) where q represents the quantity of adsorbed metallic ion per unit of mass (mg g-1), kf is the Freundlich isotherm constant, c1 represents the solution equilibrium concen- tration (mg L-1) and 1/n Freundlich constant that describes ...

  • Adsorption and degradation of some psychiatric drugs by sol-gel synthesized titania-based photocatalysts: influence of tungsten and sodium content

    Nina L. Finčur, Maja J. Šćepanović, Mirjana Grujić-Brojčin, Biljana F. Abramović, Jugoslav B. Krstić, Aleksandar Kremenović, Tatjana Srećković, Aleksandar Golubović (2019)
    Mesoporous anatase nanopowders were doped with 0.05−0.5 mol% of W6, in order to obtain more efficient photocatalyst than TiO2 Degussa P25 in the degradation of amitriptyline (AMI) under simulated solar irradiation (SSI). Dominant XRPD peaks were ascribed to anatase phase, with additional peaks which could correspond to brookite, TiO2 bronze and sodium titanate, Na2Ti9O19. The Raman scattering measurements have confirmed anatase as dominant phase, with broad Raman feature at ~270 cm−1 possibly related to Ti–O–Na stretching vibration. All W-doped ...
    Sol-gel synthesis, Doped titania nanopowders, XRPD, Raman spectroscopy, Adsorption and photocatalytic degradation, Psychiatric drugs

  • Hydrothermal Synthesized and Alkaline Activated Carbons Prepared from Glucose and Fructose—Detailed Characterization and Testing in Heavy Metals and Methylene Blue Removal

    Sanja Krstić, Milan Kragović, Maja Pagnacco, Vladimir Dodevski, Branka Kaluđerović, Miloš Momčilović, Ivica Ristović, Marija Stojmenović (2018)
    glukoza, fruktoza, аktivni ugalj, hidrotermalni tretman, aktivacija hidroksida, teški metali, metilen plavo
    ... recyclable and show high adsorption ability towards a great number of heavy metal ions [21–24]. On the other side, Bukallah et al. (2008) [25] described the removal of methylene blue from an aqueous solution by adsorption on sand, while Tang et al. (2017) [26] showed good adsorption properties for MB of ...
    ... ingested by mouth [9,12–14]. Additionally, MB has been widely used in scientific investigations due to its high level of adsorption on solids, and as a model compound for adsorption characterizations of organic compounds in aqueous solutions [15–17]. It is in common for all mentioned pollutants that ...
    ... challenges today. Different treatment methodologies may be used for that purpose such as adsorption, precipitation, ion-exchange, coagulation, membrane filtration and photo-degradation [18,19]. Among these, adsorption and ion exchange techniques are upgraded methods in terms of their simplicity, recyclability ...

  • Differently shaped nanocrystalline (Fe, Y)3O4 and its adsorption efficiency toward inorganic arsenic species

    Biljana P Dojčinović, Boštjan Jančar, Lotfi Bessais, Aleksandar Kremenović, Nataša P Jović-Jovičić, Predrag T Banković, Dalibor M Stanković, Miloš Ognjanović, Bratislav V Antić (2019)
    Herein we report effects of partial substitution of Fe3+ by Y3+ in magnetite (Fe3O4) on morphology and inorganic arsenic species adsorption efficiency of the Fe3−xYxO4 nanoparticles formed. The series of Fe3−xYxO4 (x=0.00, 0.042 and 0.084, labeled as Y00, Y05 and Y10, respectively) was synthesized using co-precipitation followed by microwave-hydrothermal treatment (MW) at 200°C. With increase of yttrium content(xvalue), both the morphological inhomogeneity of the samples and the fraction of spinel nanorods as compared to spinel pseudospherical particles increased. By ...
    microstructure, microwave-hydrothermal synthesis, adsorption, magnetic nanoparticles, arsenic

  • Interaction of sodium dodecylsulfate (SDS) with homoionic montmorillonites: adsorption isotherms and metal-ion release

    M. Ilic, J. Gonzalez, A. Pohlmeier, H. D. Narres, M. J. Schwuger (1996)
    The interaction of dodecylsulfate anions (DS−) with homoionic Ca-, Mg-, Ni-, Cu-, Cd-, Pb- and Fe-montmorillonites were investigated. Mg- and Cd-montmorillonite do not adsorb DS−, and an anion exchange at the edges of the clay mineral does not take place. Three different adsorption processes are identified on the other montmorillonites: i) Fe-montmorillonite is covered with amorphous iron hydroxide, and DS−-anions are bound at positively charged sites. ii) On Ca- and Pb-montmorillonite DS− is precipitated as Me(DS)2. iii) On Ni- ...
    Натријум додецилсулфат, адсорпциона преципитација, монтморилонит

  • Adsorption and Polymerization of Aniline on Cu(II)-Montmorillonite:  Vibrational Spectroscopy and ab Initio Calculation

    M. Ilić, E. Koglin, A. Pohlmeier, H. D. Narres, M. J. Schwuger (2000)
    Batch adsorption experiments in the presence of oxygen were performed to study the interlayer reactions of aniline on Cu(II)-montmorillonite in aqueous solutions. At concentrations below a critical value of CC ) 2.6 mmol dm-3 only a colored Cu(II)-aniline complex is formed, characterized by a stability constant of log(Kassoc/dm3 mol-1) ) 1.5. At concentrations beyond Cc aniline polymerizes yielding a dark brown product, which is identified by two vibrational spectroscopy techniques, attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy and ...
    Анилин, адсорпција, полимеризација, Cu(II)-Монтморилонит, ФТИР, аб инитио прорачун

  • Characterization of Natural Clay from Bogovina (Serbia) and Possible Utilization in Sorption of the Herbicides

    Lazar Kaluđerović, Zorica Tomić, Rada Đurović-Pejčev, Maja Milošević (2021)
    ... lower pesticide concentrations (specific adsorption), and low-energy sorption centers at higher pesticide concentrations (non-specific adsorption). In the case of montmorillonites modified both by the HDTMA and PTMA complexes, Freundlich coefficients showed an increment in S-metolachlor ...
    ... cations acted as pillars in interlayer space.  Batch adsorption results were presented as L type isotherms, which mean that the pesticide sorption decreased with increasing pesticide concentration. This means that the adsorption of pesticide molecules occurs on the high-energy ...
    ... montmorillonite from Bogovina (Serbia) was Ca montmorillonite.  The whole modification process was monitored using several methods. The batch adsorption method was used to measure the efficiency of inorganic and organic modified montmorillonites for the sorption of the S-metolachlor ...

  • Available technological procedures for capturing CO2 in the industrial and power generation sectors

    Lola Tomić, Vesna Karović Maričić, Dušan Danilović, Branko Leković, Miroslav Crnogorac (2021)
    Climate change is a major environmental issue caused by anthropogenic emissions of greenhouse gases. Capturing CO2 and storing it in suitable geological formations is one of the main technological solutions that can provide mitigation of CO2 emission into the atmosphere. Capturing CO2 represents the first phase in process of carbon capture and storage, and includes the application of various technologies for the separation of CO2 produced in the energy and industrial sectors. There are four main systems for capturing ...
    capturing CO2, power plants, CO2 capture systems, CO2 technologies
    ... n process, adsorption can be divided into temperature swing adsorption (TSA) where adsorbent is regenerated by rising its temperature; pressure swing adsorption (PSA) and vacuum pressure swing (VPA) where adsorbent is regenerated by reducing the pressure, and electric swing adsorption (ESA) where ...
    ... 1609-1624. 26. Webley, P.A. Adsorption technology for CO2 separation and capture: a perspective. Adsorption 2014, 20, 225–231, doi: 10.1007/s10450-014-9603-2. 27. Hinkov, I.; Lamari, F.D.; Langlois, P.; Dicko, M.; Chilev, C.; & Pentchev, I. CARBON DIOXIDE CAPTURE BY ADSORPTION (REVIEW). Journal of Chemical ...
    ... solvents could be corrosive to the equipment, and high energy consumption is present during the solvent regeneration [4, 18, 22]. 3.2. Adsorption In adsorption procedures, a solid sorbent is used to bind the CO2 on its surface [4]. This is one of the promising technologies for capturing CO2 and ...

  • Smectite clays of Serbia and their application in adsorption of organic dye

    Milošević Maja, Logar Mihovil (2014)

  • Effect of galena surface oxidation on ethylxanthate adsorption on galena

    Vučinić Dušica, Kostović Milena, Lazić Predrag (2014)

  • Mechanism of stearic acid adsorption to calcite

    Mihajlović Slavica, Vučinić Dušica, Sekulić Živko, Milićević Sonja, Kolonja Božo (2013)

  • Smectite clays of Serbia and their application in adsorption of organic dye

    Milošević Maja, Logar Mihovil (2014)

  • Adsorption of malathion on mesoporous monetite obtained by mechanochemical treatment of brushite

    Mirković, M.M., Lazarević Pašti, T.D., Došen, A.M., Čebela, M.Ž., Rosić, A.A., Matović, B.Z:, Babić, B.M. (2016)

  • Influence of the organic complex concentration on adsorption of herbicide in organic modified montmorillonite

    Kaluđerović Lazar, Tomić Zorica, Đurović Rada, Milošević Maja (2016)

  • FTIR spectroscopic study оf S-мetolachlor сorption оn inorganic and organically modified montmorillonite from Bogovina

    Lazar Kaluđerović, Zorica Tomić, Jelena Bogosavljević, Ljubomir Životić, Maja Milošević (2021)
    ... 1462 cm'"! to lower wavenumbers and (3) disappearance of 1363 cm'! band (C=C-N vibrations) after adsorption. According to the literature, one of the most important mechanisms of the herbicide adsorption on PTMA - montmorillonite is a-x: bonding between benzenc the ring of the herbicide and aromatic ...
    ... Tomić, P.Z., Ašanin, P.D., Đurović-Pejčev, R., Đorđević, A., Makreski, P., 2015. Adsorption of Acetochlor Herbicide on Inorganic- and Organic-Modified Bentonite Monitored by Mid-Infrared Spectroscopy and Batch Adsorption. Spectrosc. Lett., 48(9), 685—690. DOI: 10.1080/00387010.2014.962705 337 ...
    ... under Global Challenges that are in the interlayer space and/or oxygen on the surface of the tetrahedral sheet of the montmorillonite. Keywords: adsorption, S-metolachlor, HDTMA, PTMA, infrared spectroscopy INTRODUCTION The high solubility of some herbicides negatively affects their efficiency and ...

  • Analysis Of the Process Of Carbon Capture Utilization And Storage In Underground Reservoirs

    John Nyame (2024)
    The importance of mitigating the effects of global climate change has necessitated an in-depth exploration of innovative strategies to reduce carbon dioxide (CO2) emissions. Among these strategies, Carbon Capture, Utilization, and Storage (CCUS) has emerged as a promising and transformative solution. This master thesis delves into the diverse realm of CCUS processes, aiming to unravel the positives challenges, and opportunities within this dynamic field. The analysis begins with a systematic examination of carbon capture technologies, encompassing post-combustion, pre-combustion, and oxy-fuel combustion ...
    Carbon Capture, Utilization and Storage
    ... efficiency and economics of adsorption processes such as pressure/temperature swing adsorption. [32] Metrics for adsorption capture include high working capacity and selectivity, low cost, low regeneration requirements, long-term stability, and fast kinetics. Although adsorption- based separation can ...
    ... much higher adsorption affinity for coal than CHa [73]. The gas adsorption capacity for CHa and CO- is reduced with moisture in the coal seam because water molecules compete with gas for space within the coalbed [74] hence when pressure increases within the coalbed, the adsorption capacity of CO» ...
    ... 123B [32] Hauchhum, L. . et al.: Carbon dioxide adsorption on zeolites and activated carbon by pressure swing adsorption in a fixed bed. Int. J. Energy Environ. 2014, Issue 5, p349-356 [33] Gang, L. et al.: Competition of CO2/H2O in adsorption based CO2 capture. Volume 1, Issue 1, February 2009 ...

  • Sorpcija herbicida na neorganski i organski modifikovanom prirodnom montmorionitu iz Bogovine

    Lazar M. Kaluđerović (2018-01-17)
    fikasnost prilikom sorpcije S-metolahlora i klomazona od strane neorganskih iorganski modifikovanih montmorionita sa lokaliteta Bogovina odreĎena je metodombach adsorpcije. Uzorci montmorionita su tretirani prvo rastvorom NaCl a zatim irazličitim koncentracijama organskih kompleksa. Adsorpcione izoterme su dobijenetretiranjem uzoraka različitim koncentracijama herbicida. Detaljna mineraloškakarakterizacija uzoraka uraĎena je metodom rendgenske difrakcije. Rezultati interakcijemontmorionita sa organskim kompleksima i herbicidima dobijeni su primenomrendgenskih, optičkih, termičkih i spektroskopskih metoda.Na osnovu rezultata rendgenskih ispitivanja uzoraka, utvrĎeno je prisustvoorganskih kompleksa i herbicida u meĎuslojnom prostoru montmorionita.Montmorioniti modifikovani ...
    adsorpcija, montmorionit, heksadeciltrimetilamonijum bromid,feniltrimetilamonijum hlorid, S-metolahlor, klomazon
    ... Science, 47: 1–14. Giles C. H., MacEwan T. H., Nakhwa S. N., Smith D. 1960. Studies in adsorption: Part XI. A system of classification of solution adsorption isotherms, and its use in 139 diagnosis of adsorption mechanisms and in measurement of specific surface areas of solids. Journal of the ...
    ... for sorption of the S-metolachlor and clomazone was determined using batch adsorption method. Montmorillonite samples were pretreated with NaCl solution and then with different concentrations of organic complexes. Adsorption isotherms were measured by treatment of the samples with different conc ...
    ... Food Chemistry, 49: 5364–5371. El-Nahhal Y. 2003. Adsorption mechanism of chloroacetanilide herbicides to modified montmorillonite. Journal of Environmental Science and Health, Part B, 38(5): 591–604. El-Nahhal Y., Safi J.M., 2004. Adsorption of phenanthrene on organoclays from distilled and ...

  • Back-arc underplating provided crustal accretion affecting topography and sedimentation in the Adria microplate

    Paolo Mancinelli, Vittorio Scisciani, Cristina Pauselli, Gérard M. Stampfli, Fabio Speranza, Ivana Vasiljević (2021)
    Supported by evidence of deep crustal sources for the observed magnetic anomalies in Central Italy and by outcropping gabbros in the Croatian archipelago, we model the observed gravity and magnetic anomalies in the Central Adriatic Sea and surroundings. We suggest that the major magnetic anomalies in the area are related to a wide underplating and propose that this volume represents the first stage of the back-arc Adria continental breakup in Early Permian times. During the Palaeotethys-Adria collision, underplating has ...
    Underplating, akrecija kore, Magnetske anomalije, Jadranska ploča

  • Application of Membrane Technology for Separation CO2 from Natural Gas

    Lola Tomić, Dušan Danilović, Vesna Karović Maričić, Branko Leković, Miroslav Crnogorac (2020)
    Natural gas consists of a mixture of hydrocarbons with the largest share of methane, and non-hydrocarbon impure components such as N2, CO2 and H2S. In order to fulfill the gas market requirements, it is necessary to separate these unwanted components from the natural gas stream. There are several available technologies for the separation of CO2 from natural gas, such as: polymeric membranes, cryogenic distillation, absorption and adsorption. In this paper is presented the mechanism of CO2 separation using membrane technology, ...
    separacija CO2, polimerne membrane, membranski moduli

  • Efikasnost različitih tipova glina Srbije za adsorpciju metilen plavog

    Maja D. Milošević (2016-12-09)
    Adsorpciona efikasnost različitih uzoraka glina sa lokaliteta Srbije određenaje njihovim tretiranjem različitim koncentracijama rastvora metilen plavog (MP).Detaljna mineraloška karakterizacija ispitivanih glina i rezultati njihove interakcijesa rastvorima MP dobijeni su primenom optičkih, rendgenskih, hemijskih, DTA ispektroskopskih metoda.Na osnovu formiranja MP agregata u izmenljivim pozicijama i površiničestica gline, razlikuju se dva tipa glinovitih minerala: visoko naelektrisani(smektiti) i nisko naelektrisani (kaoliniti). Dimeri se stvaraju na naelektrisanimpovršinama, a granica njihovog razvoja omogućuje determinaciju mineralne vrste.Molekuli MP stoje pod uglom od 21.5o kada se ...
    minerali glina, metilen plavo, kristali metilen plavog, difuznarefleksija, adsorpcija, flokulacija, naelektrisanje slojeva
    ... Serbia for Adsorption of Methylene Blue. Maja D. Milošević Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Efikasnost različitih tipova glina Srbije za adsorpciju metilen plavog;Efficiency of Different Types of Clays from Serbia for Adsorption of Methylene ...
    ... 549:553.612(043.3) 549.6:542(043.3) Efficiency of different types of clays from Serbia for adsorption of methylene blue Abstract Efficiency of different types of clays from Serbia for adsorption of methylene blue was determined by their interaction with different concentrations of methylene ...
    ... suspension it is evident that different types of clays are efficient in adsorption of larger quantities of MB molecules (smectite) from the solution or/and in flocculation (kaolinite) of lower concentrated MB solutions. High adsorption or flocculation ability of different types of raw clays from Serbia ...