• The adsorption isotherms obtained at 27ºC and optimum pH fitted well into both the Freundlich and Langmuir isotherms. (academicjournals.org)
  • The Freundlich and Langmuir equations are log Ð" =0.504 log C e +0.6939 and 1/Ð" = 0.176/C e -0.03, respectively. (academicjournals.org)
  • The adsorption isotherm data were fitted to the Langmuir, Freundlich and Temkin isotherm models. (scirp.org)
  • The isotherm data could be explained well using the Freundlich isotherm model. (scirp.org)
  • This is the very well known Hashimoto method of linearization by the integration of the Freundlich isotherm (Hashimoto, 1964), Hashimoto, I., Deshpande K. B., and K. C. Thomas. (originlab.com)
  • The adsorption isotherm of aluminum-vermiculite was obtained, and the data were found to fit both the Langmuir and Freundlich plots. (epa.gov)
  • The Langmuir and Freundlich equilibrium isotherm models fitted the adsorption data well with R(2)=0.996 and 0.912, respectively. (unboundmedicine.com)
  • Several models (Langmuir, Freundlich, Temkin, Jovanovic) were tested to describe the experimental adsorption isotherms. (lu.se)
  • The isotherms when analyzed with the combined Langmuir-Freundlich model indicated presence of unequal binding sites on cellulose and/or negative cooperativity in the binding of the enzyme molecules. (lu.se)
  • The dye sorption process at equilibrium was following both Langmuir and Freundlich isotherm models. (hindawi.com)
  • The Langmuir and Freundlich isotherms were used to evaluate the feasibility of the adsorption process. (uwaterloo.ca)
  • The adsorption isotherm analysis of methylene blue on hydrogel showed that the adsorption process was consistent with Langmuir and Freundlich models. (techscience.com)
  • The correlation coefficient of the Freundlich isotherm model was higher, indicating that the adsorption of methylene blue on hydrogel was mainly chemisorption. (techscience.com)
  • Adsorption isotherms (Langmuir, Freundlich and Dubinin-Radushkevich (D-R)) and thermodynamic parameters were calculated and obtained data were evaluated. (scialert.net)
  • The Freundlich and D-R equations are in quite an agreement with the equilibrium isotherm for these adsorbents. (scialert.net)
  • Application of models as given by the Freundlich, Langmuir etc. has been shown by many authors and these have also been reviewed. (benthamscience.com)
  • Finally, the adsorption of ReO4- and other interferences is modelled with adsorption isotherms such as Langmuir, Freundlich and Sips. (lancs.ac.uk)
  • Langmuir and Freundlich adsorption isotherms have been used to investigate with adapted fungal consortium on removal of toxic pollutants (dye), the best fitting was observed in both monolayer model (R 2 about 0.98) as well as Freundlich model in an experimental data with used dye (R 2 about 0.92). (scialert.net)
  • The Langmuir, Freundlich and Dubinin-Redushkevich models were used to predict adsorption capacities at untested concentrations for the three adsorbates and three ACF adsorbers in the both passive and active modes. (cdc.gov)
  • The experimental data were examined by Langmuir and Freundlich isotherms. (scirp.org)
  • Kinetics, isotherm models, and thermodynamics were evaluated. (iwaponline.com)
  • Adsorption kinetics was analyzed using normal first order and Lagergren first order kinetic models. (scirp.org)
  • Studying adsorption kinetics showed that the experimental data are described better by the pseudo-second-order kinetic model. (tubitak.gov.tr)
  • The kinetics and isotherm of the adsorption were investigated in detail. (rsc.org)
  • the adsorption of methylene blue by the hydrogel was 1.259 mg/g at 25°C when the initial concentration of methylene blue was 5 mg/L. The adsorption kinetics of the hydrogel fit the pseudo-first-order kinetic model, pseudo-second-order kinetic model, Eovich model and particle diffusion model. (techscience.com)
  • Adsorption isotherms, kinetics, and used adsorbent regeneration were also investigated. (ugm.ac.id)
  • The WTR nanoparticles demonstrated high removal efficiency for Cd from aqueous solution as the adsorption capacities of nWTR were 17 and 10 times higher than those of bulk WTR in single- and multielement systems, respectively. (hindawi.com)
  • The dye adsorption capacities of the composites were higher than the pristine clay. (scirp.org)
  • These carbon materials present CO 2 adsorption capacities, at 25°C and 101.3 kPa, comparable to those obtained by other complex carbon or inorganic materials. (frontiersin.org)
  • In contrast, CO 2 adsorption capacities at 25°C and 15 kPa are more related to only pores of sizes lower than 0.7 nm. (frontiersin.org)
  • Maximum sorption capacities of 1666, 1111, 227 and 29 mg g −1 were obtained from the Langmuir isotherms for MB and RhB in single and binary solutions, respectively. (rsc.org)
  • Tested VOC adsorption rates and adsorption capacities on ACF are greater than tested indoor sink materials by a factor of 1 to 3 orders of magnitude in the 10 to 1000 mg/m3 concentration range and by a factor of 3 to 6 orders of magnitude in the 0.01 to 10 mg/m 3 concentration range, respectively. (cdc.gov)
  • Competitive adsorption of indoor VOCs shortens the breakthrough time of ACF filters and reduces their adsorption capacities on each individual VOC. (cdc.gov)
  • From the results we can see that the adsorption capacities of Cd(II), Pb(II), and Cu(II) increase with increasing pH of the solution. (iwaponline.com)
  • The adsorption equilibrium data were fitted well with the Langmuir isotherm, which revealed that the maximum adsorption capacities for monolayer saturation of Cd(II), Pb(II), and Cu(II) were 0.555, 0.733 and 0.827 mmol/g, respectively. (iwaponline.com)
  • The adsorption of gases and solutes is usually described through isotherms, that is, the amount of adsorbate on the adsorbent as a function of its pressure (if gas) or concentration (for liquid phase solutes) at constant temperature. (wikipedia.org)
  • The effects of contact time, initial concentration of Cu$^{2+}$, initial pH of Cu$^{2+}$ solutions, and temperature on adsorption process were investigated. (tubitak.gov.tr)
  • Adsorption removal of a dye, Acid Brilliant Scarlet GR, from aqueous solution onto the sludge-based activated carbon was studied under varying conditions of adsorption time, initial concentration, carbon dosage and pH. (unboundmedicine.com)
  • Adsorption equilibrium was obtained in 15 min for the dye initial concentration of 300 mg/L. Initial pH of solution had an insignificant impact on the dye removal. (unboundmedicine.com)
  • Results indicated that 99.7% coloration and 99.6% total organic carbon (TOC) were removed after 15 min adsorption in the synthetic solution of Acid Brilliant Scarlet GR with initial concentration of 300 mg/L of the dye and 20 g/L activated carbon. (unboundmedicine.com)
  • The objective of this project is to evaluate the adsorption properties of CNC for the removal of methylene blue from aqueous solution by changing the parameters, such as adsorbent dosage, initial dye concentration, pH, temperature and salt concentration. (uwaterloo.ca)
  • Optimization of significant variables such as pH, adsorbent dosage, initial MB concentration, initial RhB concentration and adsorption time affecting both single and binary dye removal was developed by Central Composite Design (CCD) under response surface methodology (RSM), and the optimized values for these parameters in binary solutions were found to be 6.45, 0.014 g, 60 mg L −1 , 15 mg L −1 and 9.9 min, respectively. (rsc.org)
  • The removal efficiency of the adsorbent is to be considered an output layer and the adsorption parameters such as pH, time, initial concentration, temperature etc., are to be considered an input layer of the ANN model. (scialert.net)
  • From electrical measurements in IgE concentration dependent, the association constant between IgE molecules and IgE aptamer could be calucated to be 5.14 × 108 (M-1 ) using the Langmuir adsorption isotherm. (actapress.com)
  • The previous adsorption capacity was achieved with 60 minutes adsorption which represents 8.5 % of the initial concentration. (edu.sa)
  • The effects of experimental parameters such as pH value, initial concentration, contact time and temperature on the adsorption were studied. (iwaponline.com)
  • Written by Adeel Abbas An adsorption isotherm is a graphical representation of the relationship between the concentration of the adsorbate (the variable x) and the amount of adsorbate that is adsorbed onto the solid phase (the variable y). (themasterchemistry.com)
  • We evaluated the adsorption capacity of Cr (VI) in aqueous solutions and in the process we also analyzed the influence of the initial concentration and pH of the solution. (scielo.org.pe)
  • The adsorption efficiency of the three polymers toward Pb(II) and various toxic metal ions present in sewage was evaluated as a function of adsorbent dose, time, temperature, pH value, and initial ion concentration to determine optimum adsorption conditions. (biomedcentral.com)
  • Additionally, the fitting of isotherm data by the Dubinin-Radushkevich model showed that the adsorption process occurred by physisorption mechanism. (tubitak.gov.tr)
  • This study aimed to investigate and explore the possibility of using eggshell powder (ES) and natural hydroxyapatite (HAp) derived from chicken bone for adsorption of Sr(II) ions from aqueous solutions. (scialert.net)
  • The main form of Cd in contaminated water is Cd(II) and the remediation technologies available to reduce Cd concentrations in contaminated water systems include ion-exchange, solvent extraction, chemical precipitation, phytoextraction, ultrafiltration, reverse osmosis, electrodialysis, and adsorption [ 3 - 6 ]. (hindawi.com)
  • The term sorption encompasses both adsorption and absorption, and desorption is the reverse of sorption. (wikipedia.org)
  • Moreover, the adsorption capacity of this carbon fiber was totally recovered in a very fast desorption cycle at the same operation temperature and total pressure and, therefore, without any additional energy requirement. (frontiersin.org)
  • The linear Langmuir sink model was examined for indoor sink materials and found to be applicable, while the non-linear sink model was successfully applied for ACF, with the assumption that the adsorption process follows the non-linear isotherm and the desorption process follows the linear isotherm. (cdc.gov)
  • Living systems are full of interfaces and they have adopted to regulate adsorption/ desorption processes. (lu.se)
  • Tewari, N., Guha, B.K. and Asudevan, P.V. (2005) Adsorption Study of Hexavalent Chromium by Bentonite Clay. (scirp.org)
  • Pradhan, J., Das, S.N. and Thakur, R.S. (1999) Adsorption of Hexavalent Chromium from Aqueous Solution by Using Activated Red Mud. (scirp.org)
  • The results of the nitrogen adsorption characterization show that MS-50 has a large surface area and porosity, resulting in good mesoporous silica. (nih.gov)
  • Adsorption is present in many natural, physical, biological and chemical systems and is widely used in industrial applications such as heterogeneous catalysts, activated charcoal, capturing and using waste heat to provide cold water for air conditioning and other process requirements (adsorption chillers), synthetic resins, increasing storage capacity of carbide-derived carbons and water purification. (wikipedia.org)
  • The greater adsorption capacity of water treatment residuals nanoparticles (nWTRs) in comparison with larger particles suggests their use as a very promising candidate for contaminated water and wastewater remediation. (hindawi.com)
  • The objectives of this study were therefore (i) to determine cadmium adsorption capacity of water treatment residual nanoparticles and to investigate the pertinent adsorption mechanism and (ii) to study the effects of operational parameters including adsorbent dosages, solution pH, and competing cations on the removal of Cd by nWTRs. (hindawi.com)
  • The maximum adsorption capacity of the composite was enhanced by 51% for Acid Green 25 and 160% for Acid Green 27, compared to the pristine layered clay sample. (scirp.org)
  • By introducing magnetic laponite RD the adsorption capacity of nanocomposites for Cu$^{2+}$ was significantly improved. (tubitak.gov.tr)
  • The capacity values obtained in column adsorption experiments were really promising. (frontiersin.org)
  • Therefore, appropriate adsorbents must present sufficient adsorption capacity, high CO 2 selectivity, adequate density and hardness, low abrasion index, and good stability in moisture conditions. (frontiersin.org)
  • On the other hand, activated carbon materials are usually adversely compared in terms of CO 2 adsorption capacity and/or selectivity. (frontiersin.org)
  • The adsorption capacity of CNC was determined using the linearized form of Langmuir model. (uwaterloo.ca)
  • After the oxidation, the adsorption capacity increased from 118 to 769 mg/g. (uwaterloo.ca)
  • The Ideal Adsorbed Solution Theory effectiveness was examined for predicting adsorption capacity of each chemical in a binary mixture, and the prediction was found to agree quite well with experimental results. (cdc.gov)
  • This sample was further tested for its adsorption capacity against 4-chlorophenol and showed a maximum adsorption capacity of (17 mg/g). (edu.sa)
  • The best results were obtained with activated carbon P1/600 with an adsorption capacity of 75,2 mg /g at pH= 2. (scielo.org.pe)
  • The reduction in adsorption capacity was minimal after several adsorption and regeneration cycles. (ugm.ac.id)
  • Brunauer, Emmett and Teller's model of multilayer adsorption is a random distribution of molecules on the material surface. (wikipedia.org)
  • The experimental data fitted well to Langmuir isotherm model. (scirp.org)
  • The adsorption of Cu$^{2+}$ on nanocomposites followed the Langmuir isotherm model well. (tubitak.gov.tr)
  • This App provides a convenient way to transform your raw data related to adsorption isotherm into a linear dataset with various types of the model provided, and perform linear fitting with the new dataset. (originlab.com)
  • The experimental isotherms were best described by a model of Langmuir type with two adsorption sites and by a. (lu.se)
  • The Cd 2+ adsorption experiment data best fit the Langmuir isotherm model with the maximum amount of Cd 2+ that MS-50 could absorb being 103.10 mg g -1 . (nih.gov)
  • In addition, ANN model is an effective technique in modeling, estimation and prediction of adsorption process for Sr(II) ions onto ES and BA-HAp. (scialert.net)
  • The mechanism of adsorption is also highly complex and difficult to model and simulate using conventional mathematical modelling due to the interaction of more number of adsorption process variables 11 . (scialert.net)
  • The kinetic results were adjusted better to the pseudo second order model and the results of the isotherms were correlated better with the Langmuir model, indicating that the adsorption is carried out in homogeneous energetically active centers. (scielo.org.pe)
  • The more important parameters that influence and determine the adsorption of inorganics from aqueous solutions are the acidic carbon-oxygen surface groups present on the carbon surface and the pH of the solutions. (eurekaselect.com)
  • Adsorption properties of layered anionic clay-composites for the removal of anionic dyes from water were studied. (scirp.org)
  • N. Bleiman and Y. G. Mishael, "Selenium Removal from Drinking Water by Adsorption to Chitosan-Clay Composites and Oxides: Batch and Columns Tests," Journal of Hazardous Materials, Vol. 183, No. 1-3, 2010, pp. 590-595. (scirp.org)
  • It was found that the adsorption is independent of pH, however increase in temperature and ionic strength decreased the removal percentage slightly. (uwaterloo.ca)
  • The artificial neural networks (ANN) are carried out for prediction of adsorption efficiency for the removal of Sr(II) ions from aqueous solution by eggshell (ES) and bone ash-hydroxyapatite (BA-HAp). (scialert.net)
  • Experimental results indicated that adsorption of Sr(II) was highly pH dependent and strontium removal at relatively high at pH 5 for BA-HAp and pH 6 for ES. (scialert.net)
  • The review aims to give a comprehensive picture on the studies of isotherm of adsorption for metal removal on montmorillonites during the last few years. (benthamscience.com)
  • Adsorptive removal of phenol and aniline by modified bentonite: Adsorption isotherm and kinetic study. (ugm.ac.id)
  • M. Auta and B. H. Hameed, "Chitosan-Clay Composite as Highly Effective and Low-Cost Adsorbent for Batch and Fixed-Bed Adsorption of Methylene Blue," Chemical Engineering Journal, Vol. 237, 2014, pp. 352-361. (scirp.org)
  • Hydrogen adsorption-absorption processes and electrochemical hydrogen permeation test techniques for the determination of the susceptibility of metals to internal hydrogen embrittlement are presented. (astm.org)
  • In aniline's case, Langmuir and Parachloro-aniline Sips models gave the best fitting with the highest R 2 value. (ugm.ac.id)
  • The exact nature of the bonding depends on the details of the species involved, but the adsorption process is generally classified as physisorption (characteristic of weak van der Waals forces) or chemisorption (characteristic of covalent bonding). (wikipedia.org)
  • Fourier transmission infrared (FTIR) analyses suggested the participation of OH − , O-Al-O, FeOH, and FeOOH entities in the adsorption process. (hindawi.com)
  • The kinetic studies show that uptake of lead ions increases with time and that maximum adsorption was obtained within the first 30 min of the process. (academicjournals.org)
  • Among various treatment methods adsorption process is one of the most effective and economically feasible alternative methods used to remove metal ions from waste solutions. (scialert.net)
  • The ANN is one of the data based non-traditional tools for modeling of the adsorption process. (scialert.net)
  • The adsorption was an exothermic process. (iwaponline.com)
  • Adsorption is a surface phenomenon and the adsorbate does not penetrate through the surface and into the bulk of the adsorbent, while absorption involves transfer of the absorbate into the volume of the material, although adsorption does often precede absorption. (wikipedia.org)
  • These two models' plots showed that both physical and chemical adsorption were feasible. (iwaponline.com)
  • To date, 15 different isotherm models have been developed. (wikipedia.org)
  • Thermodynamic studies indicated that the adsorption is physical, which is consistent with the results of the isotherm models. (scialert.net)
  • This chapter aims at presenting the most common models describing the adsorption at solid/solution interfaces. (eurekaselect.com)
  • Several methods such as coagulation, aeration, oxidation and activated carbon adsorption have been used for the treatment of water but the activated carbon adsorption has been found to be the best broad spectrum technology available at the present moment. (eurekaselect.com)
  • Adsorption and Oxidation Techniques to Remove Organic Pollutants from Water. (ugm.ac.id)
  • Adsorption, ion exchange and chromatography are sorption processes in which certain adsorbates are selectively transferred from the fluid phase to the surface of insoluble, rigid particles suspended in a vessel or packed in a column. (wikipedia.org)
  • The adsorption of surfactants in the metal surface can markedly change the corrosion resisting property of the metal. (emerald.com)
  • So the study of the relation between the adsorption and corrosion inhibition is of a great importance. (emerald.com)
  • Adsorption experiments were conducted with NaReO4, NaCl, Na2SO4 and Na2CO3 and it was found that self-assembled monolayers of the TREN ligand and the active component of TEVA resin, Aliquat-336, did not yield any adsorption results, possibly because ReO4- is too light to be detected by a single monolayer. (lancs.ac.uk)
  • The most important application of activated carbon adsorption where large amounts of activated carbons are being consumed and where the consumption is ever increasing is the purification of domestic and industrial waste water. (eurekaselect.com)
  • Activated carbons were characterized by FTIR, N2 adsorption at 77 K and measurement of surface acid groups. (scielo.org.pe)
  • Testing the suggested technique with groundwater resulted in an 82% CR adsorption efficiency. (iwaponline.com)
  • The efficacy of adsorption was quantitative for metal ions present in a real sample of wastewater and the efficiency didn't drop even after 7 cycles of use. (biomedcentral.com)
  • Adsorption to microcrystalline cellulose (Avicel) of pure cellobiohydrolase I and II (CBH I and CBH II) from Trichoderma reesei has been studied. (lu.se)
  • The adsorption behavior of 8QSC on copper metal in acid medium obeyed the Langmuir isotherm. (amrita.edu)
  • The current research paper focuses on studying the adsorption behavior of aniline and parachloro-aniline using a graphite-based adsorbent, namely, Nyex-1000, and the subsequent regeneration of the adsorbent. (ugm.ac.id)
  • The clay-alginate composite with 5.9% alginate showed highest adsorption for both the dyes. (scirp.org)
  • The high surface area and the presence of permanent negative charge on the surface makes cellulose nanocrystal (CNC) an excellent candidate for the adsorption of basic (cationic) dyes. (uwaterloo.ca)
  • however, through the analysis with adsorption isotherms, it was found that Na+ cations where adsorbed in the thin film, rather than ReO4- anions, possibly through cation-π interactions. (lancs.ac.uk)
  • Adsorption is the adhesion of atoms, ions or molecules from a gas, liquid or dissolved solid to a surface. (wikipedia.org)
  • ii) Adsorption and adhesion at interfaces. (lu.se)
  • These studies are limited in the literature although there is no study about the artificial neural networks was used for modeling of adsorption of Sr(II) from aqueous solutions by eggshell and bone ash. (scialert.net)
  • Δ G and Δ H being negative suggest that the adsorption was thermodynamically favorable and spontaneous. (iwaponline.com)
  • Adsorption isotherms help determine the quantity of adsorbate that is adsorbed by the solid phase. (themasterchemistry.com)
  • The protonated part of hydroxyl and carboxyl group of CLPP combine with negative part of Congo red dye for adsorption of dye molecules. (iwaponline.com)
  • In addition the porous structure of the carbon surface which includes the existence of mesopores shall also be an important factor for the adsorption of essentially non-polar organic molecules. (eurekaselect.com)