Tìm thấy 20+ kết quả cho từ khóa "Adsorption isotherm"
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Langmuir adsorption isotherm plot for the electrocoagulation of BTB solution.. Freundlich adsorption isotherm plot for the electrocoagulation of BTB solution.
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The impregnated carbon gives a Type I adsorption isotherm according to IUPAC and is presented in Figure 3b. 14 Compared with the impregnated alumina isotherm, this isotherm shows a sharp rise at low relative pressures reaching an. Nitrogen adsorption/desorption isotherms at 77 K for a) impregnated alumina and b) impregnated carbon.. Main characteristics of the new composite materials.. Characteristics Impregnated alumina Impregnated carbon.
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Langmuir plot for the adsorption of metal ion onto Pt/SBA15-PrSO 3 H.. Freundlich plot for the adsorption of metal ion onto Pt/SBA15-PrSO 3 H by Pt/SBA15-PrSO 3 H.. The kinetic parameters for the adsorption of metal ions on the Pt/SBA15-PrSO 3 H mesoporous material.. Adsorption isotherm model parameters for the adsorption of Zn(II) onto Pt/SBA15-PrSO 3 H.. The adsorption isotherm of Zn 2+ exhibits Langmuir behavior, which expresses a monolayer adsorption.
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The adsorption isotherm indicates how the adsorption molecules distribute between the liquid phase and the solid phase when the adsorption process approaches an equilibrium state . The analysis of the isotherm data by fitting them to different isotherm models is an important step to find the suitable model [21-23]. Langmuir Adsorption. constants incorporating the factors affecting the adsorption capacity and adsorption intensity, respectively (Fig.
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Effect of time on the adsorption of MMT and Fe(II)-MMT (1) and Fe(II)-MMT (2) for phosphate (adsorption conditions: initial condition 40 mg/L, pH 2.0, temperature 310 K).. Adsorption isotherm of MMT, Fe(II)-MMT (1), and Fe(II)-MMT (2) for adsorption of phosphate (adsorp- tion conditions: initial condition 40 mg/L, pH 2.0, and temperature 298 K)..
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Thermodynamic consideration reveals that adsorption of Green tea extract on mild steel surface is spontaneous and occurs according to Langmuir adsorption isotherm. Physical adsorption mechanism has been proposed for the adsorption of the inhibitor from the values of some kinetic and thermodynamic parameters.. Key words: Corrosion inhibition, mild steel, Langmuir adsorption isotherm, physical adsorption, green tea.
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The CO 2 adsorption test results obtained may be used to get further information about the material that is studied, as the physical adsorption of gases and vapors is a very useful technique for the characterization of microporous solids. method applied to the adsorption isotherm. 18 As the surface area is inadequate for giving information about the pore size, pore shape, and pore surface chemistry, over the past 50 years methods of isotherm analysis have been used to get an overview of the pore
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In view of all the related work cited in the field, the present paper offers a discussion of different types of nanomaterials, adsorption isotherm models, and adsorption kinetics. As regards the control of the adsorption process, the present work is concerned with choosing the best ANN model and its related parameters to forecast the adsorption efficiency of zinc(II), nickel(II), and copper(II) in the selected cases.
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The Freundlich adsorption isotherm 48 assumes a multilayer adsorption mechanism that takes place on a heterogeneous surface, where the adsorption capacity increases as the adsorbate concentration increases.
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Figure 1: Langmuir isotherm for the adsorption of caffeine on the surface of CT38 steel in 1M HCl The adsorption characteristics of caffeine were also investigated by fitting data obtained for the degree of surface coverage into different adsorption isotherms. The tests indicate that Langmuir adsorption isotherm best describes the adsorption behaviour of caffeine.
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Graph of MIPs and NIPs adsorption isotherm with the Freundlich equation.. Data from the calculation of the isotherm study of the Freundlich equation are shown in Table 2 and Figure 5.. Determination of the adsorption coefficient (A) could be roughly used as an indicator of adsorption capacity, while the value of 1/n represented.
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The linearized form of the Freundlich adsorption isotherm model is given by ln q e = lnK F + 1. where q e (mg g − 1 ) is the amount of M(II) ion adsorbed at equilibrium, K F (mg g − 1 ) is the adsorption capacity, n is the adsorption intensity and C e (mg L − 1 ) is the concentration at equilibrium. Overall, the Langmuir isotherm model correlation coefficients were significantly closer to unity relative to those of the Freundlich isotherm model (Table 1).
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BET surface area calculated from N 2 adsorption isotherm in the relative pressure (P/P 0 ) range from 0.05 to 0.20. Langmuir surface area calculated from N 2 adsorption isotherm in the pressure range from 30 to 220 mbar. Micropore surface area calculated from the N 2 adsorption isotherm using t-plot method from the Harkins–Jura equation.
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The BET surface areas of the natural zeolite and modified natural zeolites were calculated using the adsorption isotherm in the range of relative pressure from 0.03 to 0.2. About 0.1 g of the sample was outgassed in a vacuum at 300 ◦ C for 7 h before methane adsorption.. The chemical compositions of the natural and modified mordenite samples are listed in Table 1.
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(a) Langmuir adsorption isotherm and (b) Freundlich adsorption isotherm for the adsorption of MB on j-CNCs/pSiDm hydrogel.. In the Langmuir model, R L gives a qualitative measure of the favorability of the adsorption process. 1/n corresponds to the order of the isotherm and is considered as irreversible (1/n ¼ 0), favorable (0 <. The predicted K F value (33.519 mg/g) is a rough indicator of the adsorption capacity and the higher the K F value, the greater the adsorption capacity.
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Analysis of isotherm data is important for predicting the adsorption capacity of the membrane, which is one of the main parameters required for the design of an adsorption system.. The Langmuir adsorption isotherm is valid for monolayer sorption onto a surface with a finite number of identical sites while the Freundlich model is indicative of the surface heterogeneity of the sorbent. Isotherms fitting parameters of phenol and resorcinol adsorption onto PES-UF membrane..
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Typical experimental dependence of the minor dis- turbance peak retention is shown in Figure 2-7.. (2-49) Since the measurement of the excess adsorption isotherm of a component in the binary system does not require a priori introduction of any model, it is possible to consider the excess adsorption isotherm as being model- independent (within a framework of adsorption process) and it is possible to derive the properties of the adsorbed layer on the basis of consideration of.
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The pseudo-second order kinetic model demonstrates that the combination of bentonite particles gives a structure and a higher number of available adsorption positions on the surface of the hydrogel for metal ions.. Kinetic parameters of metal sorption onto CMC/bentonite hydrogel Metal. Pseudo-first-order kinetic Pseudo-second-order kinetic. Adsorption isotherm of metal ions by CMC/bentonite hydrogel. Isotherm parameters of metal sorption onto CMC/bentonite hydrogel.
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The adsorption mechanism of Cr(VI) onto FGCs adsorbent is proposed in Figure 2. 6d), however, after adsorption Cr(VI), two new peaks have appeared at 0.5 keV and 5.5 keV which can be attributed to successfully adsorbed Cr(VI) on FCGs surface.. Adsorption isotherm of Cr(VI) on FCGs following Langmuir and Freundlich are shown in Figure 3.
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Analytical characteristics and adsorption isotherm capacity results of the method.. The adsorption capacity of the adsorbent was obtained by using the Freundlich isotherm based on the following equation: 47. Freundlich adsorption isotherm models for Pb(II), Co(II), and Ni(II) adsorption on EDTA-ACC.. To evaluate the accuracy of the developed preconcentration method, certified reference materials (SPS-WW2 wastewater and BCR-146R sewage sludge amended soil (industrial origin)) were analyzed.