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Sorption isotherm

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Parameterization, kinetics, and adsorption isotherm of electrocoagulation process of bromothymol blue in aqueous medium using aluminum electrodes

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Langmuir adsorption isotherm plot for the electrocoagulation of BTB solution.. Freundlich adsorption isotherm plot for the electrocoagulation of BTB solution.

Sorption studies of europium on cerium phosphate using Box-Behnken design

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Sorption studies of europium on cerium phosphate using Box-Behnken design. Abstract: Amorphous cerium phosphate was prepared and characterized. Sorption isotherm data was well explained by the Langmuir model and monolayer Eu(III) sorption capacity was obtained as 30.40 mg g −1 . Because of the growing demand for LEDs and LCDs, it is becoming a more vital element for the electronic industry [3].

Adsorption isotherm modeling of carbendazim and flumetsulam onto homoionic-montmorillonite clays: Comparison of linear and nonlinear models

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The equation parameters of these equilibrium models provide the sorption mechanisms, surface properties, and affinities of the sorbent. In the present study, three isotherm models were tested using carbendazim and flumetsulam as adsorbate molecules.. Freundlich isotherm. The Freundlich isotherm has been largely used to describe solid-liquid sorption systems.

Introduction to Modern Liquid Chromatography, Third Edition part 79

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Figure 15.4 Illustration of a sorption isotherm for K = 25 and = 0.2. (a) Plot showing the influence of mobile-phase solute concentration on the retention factor k and surface coverage θ. (b) logarithmic plot illustrating the range of the linear isotherm.. Figure 15.4a shows a plot of θ vs. Figure 15.4b is a re-plot of Figure 15.4a with a logarithmic scale for C m . 15.3.1.2 Peak Width for Small versus Large Samples.

Preparation of hydrogel reinforced with bentonite by gamma irradiation for metal absorption

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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.

Removal of Pb(II) and Cd(II) from aqueous solution using alkaline-modified pumice stone powder (PSP): Equilibrium, kinetic, and thermodynamic studies

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The Langmuir adsorption isotherm provided the better fit of the experimental sorption data for the Pb(II) and Cd(II) ions with maximum sorption capacities of 28.09 and 27.17 mg g − 1 , respectively. Drying at 55 ◦ C in an oven for 24 h removed most of the moisture. Different concentrations of the metal solutions were prepared by serial dilution of the stock solutions. pH of the solution was adjusted using either 1 M HNO 3 or 1 M NaOH..

Effect of crosslinking patterns on the properties of conjugated microporous polymers

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Gas (N 2 ) sorption measurements of the polymers were performed to verify if the synthesized polymers possessed any accessible surface area. The gas sorption isotherm of DTT-CMP-DEB showed Type I behavior 24 with high N 2 uptake at low relative pressures, pointing to a better microporous character in comparison to DTT-CMP-TEB, which displayed a lower uptake in the studied region (Figure 3).

Polymer

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A typical water-vapor sorption isotherm for the H þ forms of sulfonated styrene at various degrees of cross- linking is shown in Figure 3.. Note that the water uptake decreases from l ¼ 100 to l E4 when the cross-linking is increased from 0.25 to 25%. Taking into account that the cross-linking is ex- pected to increase the counter elastic force of the poly- mer matrix, the strong dependence of the water uptake on the degree of cross-linking can be simply explained by the Gregor model.

Synthesis, characterization, and kinetic studies of multifunctionalized mesoporous silica for adsorption of zinc

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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. It is seen that the Langmuir isotherm model fits very well with the experimental results for Zn 2+ metal adsorption from aqueous solutions using Pt/SBA15-PrSO 3 H bifunctional material..

High capacity gas capture and selectivity properties of triazatruxene-based ultramicroporous hyper-crosslinked covalent polymer

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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.

Understanding of phenolic compound retention mechanisms on PES-UF membrane

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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..

Removal of Cd(II), Cu(II), and Pb(II) by adsorption onto natural clay: A kinetic and thermodynamic study

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The Temkin isotherm is based on the assumption that the free energy of sorption is a function of the surface coverage.. The theoretical parameters of the adsorption isotherms for the three metal cations with their correlation coefficients are listed in Table 4. We can note that the Freundlich and Temkin models are not suitable for modeling the adsorption of the three metal cations on the studied adsorbent.

Tổng hợp và ứng dụng hỗn hợp nano oxid mangan-sắt để hấp phụ As(V) từ dung dịch nước

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Adsorption Isotherm, Thermodynamic and Kinetic Study of Arsenic (III) on Iron Oxide Coated Granular Activated Charcoal. International Research Journal of Environment Sciences.

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Mối quan hệ giữa hàm lượng nước và độ hoạt động của nước Mối quan hệ giữa hàm lượng nước (dựa trên căn bản khô) và độ hoạt động của nước được diễn tả dưới dạng đường đẳng nhiệt hấp thu (sorption isotherm). Nếu cá được sấy khô hoàn toàn và sau đó bị hút ẩm trở lại, đường đẳng nhiệt hấp thu không đi theo lại đường tách ẩm cũ của sản phẩm sấy khô. Hàm lượng nước. Mối quan hệ giữa hàm lượng nước và độ hoạt động của nước 6.2.3.4.

Studies using extracts of green tea as a corrosion inhibitor for CT38 steel in 0.01m HCL solution

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Langmuir isotherm for the adsorption of W(G) extracts on the surface of CT38 steel. in 0.01M HCl. The degree of linearity of Langmuir adsorption isotherm as measured by values of R 2 is nearly equal to 1 (Table 3) which indicates that the assumption and the deduction were correct. In other words, the adsorption of W(G) extracts on steel surface in 0.01 M HCl solution is well described by. the Langmuir adsorption isotherm [4].

Box–Behnken design for removal of uranium(VI) from aqueous solution using poly(ethylene glycol) based dicationic ionic liquid impregnated chitosan

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Sorption isotherm of uranium(VI) on IL-impregnated chitosan (initial pH: 4, temperature: 50 °C, contact time: 70 min, sorbent amount: 50 mg).. Isotherm model data for uranium(VI) sorption onto IL impregnated chitosan. The comparison of uranium(VI) sorption capacity of poly(ethylene glycol)-based dicationic IL-impregnated chitosan with some other sorbents reported in the literature is presented in Table 7.. Comparison of uranium(VI) sorption capacities of various sorbents.

Phosphorus sorption by gyttja and its effect on the pH value and phosphorus in acidic soils

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Coefficients for P sorption energy and maximum P sorption capacity (b) of the gyttja were determined using a linear Langmuir isotherm. q e is the amount of P sorbed by the gyttja (mgg -1. Also, the sorption type (physical or chemical sorption) of P sorbed by the gyttja was determined using the linear shape (Eq.. 4) of the Dubinin–Redushkevich (DR) isotherm (Dubinin et al., 1947. Ho et al., 2002. Donat et al., 2005. Saltalı et al., 2007)..

SO2 sorption properties of fly ash zeolites

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Results of fitting of DA isotherm to sulfur dioxide isotherms for fly ash zeolite X.. The volume of micropores V 0 is a measure of the SO 2 sorption limit for the sorption system. For all cases, a twofold and even sometimes threefold reduction of the exhaust gas V 0 parameter was observed after the first cycle, as well as a slight change in this parameter in the next cycle.. As a result of this research, it was found that zeolite X synthesized from fly ash is a good SO 2 sorbent.

Adsorptive performance of MWCNTs for simultaneous cationic and anionic dyes removal; kinetics, thermodynamics, and isotherm study

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The nonlinear form of the Langmuir isotherm model can be written as follows;. (8) where K F and n f are isotherm constants indicating the capacity and intensity of the adsorption.

Sorption of micropollutants to hydroponic substrata: Effects of physico-chemical properties

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Isotherms were fur- ther used to identify the suitable isotherm models allowing comparison of the sorption behaviour, and providing insight into possible sorption mechanisms. Higher R 2 and smaller 𝜒 2 indicated better fitting of the data ( Tran et al., 2017. The sorption behaviour of wood fibre may not be explained by any of the models included in this study.