Tìm thấy 16+ kết quả cho từ khóa "Langmuir model"
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The suitability of Langmuir and Freundlich isotherms to the equilibrium data for Cu(II) adsorption on ĐS and ĐS/CTS samples is investigated. The adsorption of ĐS is well fitted with Freundlich isotherm while the experimental data for the ĐS/CTS composite is best described by the Langmuir model.
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Adsorption isotherm of Cr(VI) on FCGs following Langmuir and Freundlich are shown in Figure 3. The data of the Cr(VI) adsorbed at equilibrium (q e , mg.g -1 ) and the equilibrium Cr(VI)concentration (C e , mg.L -1 ) were fitted to the linear form of Langmuir adsorption model. The maximum monolayer capacity q max was calculated from the Langmuir model as 200 mg.g -1 , which is higher than that comparing to the other adsorbent, magnetite/chitosan (55.8 mg.g -1. Regeneration of FCGs adsorbent.
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The adsorption equilibrium data fit the Langmuir model. In addition, the adsorption mechanism was evaluated by the intraparticle diffusion model and appeared to be a complex mechanism..
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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. The Langmuir model is shown to be more suitable for the equilibrium data since R 2. The results indicated that sepiolite would be good adsorbent or catalyst support for the removal treatment of organic dyes .
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Similarly to the kinetic experiment, the data from the adsorption capacity experiment were also analyzed in terms of a mathematical model, namely the linearized Langmuir model, which is expressed by Eq. dsorption capacity isotherms for Cu(II), Cd(II), and Co(II) and their linearization according to the Langmuir model.. where C s is the concentration of the supernatant at adsorption equilibrium (mmol L − 1. and b is the Langmuir constant, which is related to the affinity of the absorbent by the adsorbate
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The fit of the experimental adsorption data to the Langmuir isotherm model revealed the monolayer adsorption of Cu 2+ ions onto homogeneous adsorbents’ surfaces. Figure 7 indicates this good fitting of experimental data by the Langmuir model for adsorption of Cu 2+ on mChitoPAmdLap1. where b and C o are the Langmuir constant and initial concentration of Cu 2+ ions (50 mg L − 1.
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On the other hand, adsorption isotherms showed that the Langmuir model was better than the Freundlich model. This means that the adsorption of the phosphate on Fe(II)-montmorillonites was monolayer adsorption, and the phosphate was successfully adsorbed either onto the surface or intercalated within interlayer volume. Live experiments supported the ability of Fe (II)-MMT to control hyperphosphatemia and treat chronic renal failure..
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Langmuir and Freundlich adsorption isotherms plots for EC of BTB are shown in the Supplementary informa- tion. The data obtained for the adsorption of BTB on the electrode surface could be better explained using the Freundlich isotherm model since it shows higher R 2 values than the Langmuir model (Table 2). 14 for the adsorption of an herbicide (2,4- DP) on the Al(OH) 3 surface.
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The finite active site pattern leads to the formation of a monolayer of the adsorbate molecules on the adsorbent surface. where C e is the equilibrium concentration of the Cu +2 in mg/L, Q m is the Langmuir constant related to the saturation adsorption capacity in mg/g, and b , in L/ mg, is a constant related to the affinity between the adsorbent and the adsorbate or the sorption equilibrium constant. The linear form of the Langmuir model can be expressed as:.
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The adsorption of phosphate onto Fe(II)-MMT (1) and Fe(II)-MMT (2) was rapid, within 40 min, and the kinetics were better described by a pseudo-second-order model. Adsorption isotherms fitted the Langmuir model better and revealed that the adsorption process was nonspontaneous and exothermic. All the pH values in the experiments were measured with a pH S-3C acidity meter..
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The prepared MIL-100(Fe) showed high loading capacity toward chloroquine with maximum adsorption capacity calculated from Langmuir model to be up to 555 mg/g, which has great potential for the drug delivery..
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The model assumes that the heterogeneous surface shows nonuniform distribution of adsorption heat and affinities and the adsorption heat is exponentially decreased upon the completion of adsorption process. where q e andC e are the same as in Langmuir model, k f is the Freundlich constant related to the adsorption capacity [mg g − 1 (mg L − 1 ) n. and n is an empirical parameter representing the energetic heterogeneity of the adsorption sites (dimensionless).
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Astakhov model, while the experimental data for the impregnated carbon were correlated with the Langmuir model. The experimental study was done using pure water vapor and 2 different types of commercial adsorbents: grains of activated carbon and activated alumina with an average size of d g m. The activated carbon and alumina were dried in an oven at 200 ◦ C for 4 h and then cooled in a desiccator down to room temperature.
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Effect of the initial MB Ce 1 C. e bC qe qmax (2) concentrations in the liquid and solid 1 bC . e phases, qmax is the maximum adsorption qe Kf .Ce1/n 3 capacity, b is the Langmuir equilibrium Equation (2) and (3) can be rearranged to constant, and Kf and n are the Freundlich obtain respectively the linear forms as constants. follows: As can be seen from Figure 7, the Langmuir model provided a more accurate 375 description of the adsorption process.
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Calculated surface area analysis from the Langmuir (S Lang ) and BET (S BET ) (Brunauer – Emmett – Teller) theories and textural properties are given in Table 1. According to Langmuir model, surface area of the TATHCCP was found 702 m 2 g –1 , while it was found 557 m 2 g –1 for Brunauer – Emmett – Teller model as shown in Figures S3, SI and Figures S4, SI. Total pore and micropore volume of TATHCCP was found 0.31 and 0.26, respectively at relative pressures P/P0 = 0.99 and 0.1.
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Isotherm modeling indicated that the Freundlich model could better describe the CO 2 and CH 4 adsorption onto both AC samples as compared to the Langmuir model. Additionally, the mag- netic α-Fe 2 O 3 /AC composite can be completely regenerated under atmospheric conditions. Preparation of AC and magnetic α-Fe 2 O 3 /AC composite 3.1.1. times with deionized water until the pH value of the washing solution was ~7. Preparation of magnetic α-Fe 2 O 3 /AC composite powder.
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Langmuir model is the best to describe the sorption of Eu(III) and monolayer Eu(III) sorption capacity was found to be 30.40 mg g − 1 . Based on the value of R 2 , the pseudo-second-order model was best to fit the kinetic data..
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In this paper, we use sum-frequency generation vibrational spectroscopy to study effects of various halide anions in the AA Langmuir monolayer on water interface. Wavenumber (cm-1) AA_H 2 O AA_1M NaCl AA_1M NaI. Wavenumber (cm- 1 ) AA_H 2 O AA_1M NaCl AA_1M NaI. SFG spectra of monolayer AA/ salt solutions NaI, NaCl at the same concentration..
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The adsorption mechanism was determined by the use of adsorption isotherms such as Langmuir, Freundlich, and Temkin models.
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The linearized form of the Langmuir isotherm model is given as 1. where q e is the amount of metal ions adsorbed at equilibrium, q max is the adsorption capacity (mg g − 1. C e (mg L − 1 ) is the equilibrium concentration, and b is the equilibrium Langmuir constant.