Tìm thấy 20+ kết quả cho từ khóa "Adsorption mechanism"
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The adsorption process is evaluated by different kinetic models such as the pseudo-first-order, pseudo-second-order, and Elovich. The adsorption mechanism was determined by the use of adsorption isotherms such as Langmuir, Freundlich, and Temkin models.
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The value of E provides information about the adsorption mechanism. 31 Therefore, we can conclude that physisorption is the adsorption mechanism for all the adsorbents studied at all temperature levels and for AC4 and AC5 samples at 25 ◦ C ion exchange mechanism may have played an additional role. Results of the adsorption experiments at CO 2 pressure of 1 bar and 20 bars. CO 2 adsorption capacities.
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Influence of pH on the adsorption of metal ion onto Pt/SBA15-PrSO 3 H.. The kinetics of Zn 2+ adsorption onto Pt/SBA15-PrSO 3 H were studied to determine the adsorption mechanism.. The curve in the plots of the log (q e – q t ) against time was linear, which can be obtained from the slope and intercept of the plot (Figure 7). Textural properties of the Pt/SBA15-PrSO 3 H.. where k 2 is the adsorption rate constant for the second-order adsorption (g mg − 1 min − 1.
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Furthermore, the types of adsorption mechanism that can happen between the phases, the conditions of the process, and changing forces during the control process are the main factors that influence the adsorption process. 34,35 Effect of temperature on the adsorption process was studied at five different temperatures (5–40 ◦ C). As seen in Figure 5, maximum cellulase adsorption was observed at 25 ◦ C.
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This thesis ―Quantum simulation of the adsorption of toxic gases on the surface of borophene‖ includes three chapters. The detailed discussions of the adsorption mechanism are given.. of the reference system equal to the extact ground-state electron density. of the molecule we are interested in. The electrons do not interact with one another in the reference system, so the Hamiltonian of the reference system is.
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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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The adsorption of ionic dyes from aqueous solution is dependent on various factors such as structure and functional behavior of the biochars, mass transport, and electrostatic interactions. 40,41 Furthermore, it has been reported that the adsorption mechanism depends on the π– π * interactions between aromatic regions of the dye molecules and graphene-like sheets of carbon-based adsorbents. 42,43 To prove the existence of π– π * interactions in the biochars, XPS analysis is.
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E corr of mild steel shifted significantly to more positive values, mechanism of cathodic hydrogen evolution unchanges but mechanism of anodic dissolution changes.. Adsorption Isotherm. According to some researchers [3,4,5], the corrosion inhibition mechanism of inhibitors which derived from green plants are the adsorption mechanism.
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The effects of pH, adsorbent dose, contact time, and initial dye concentration on the adsorption efficiencies were investigated. Adsorption of the five dyes was found to obey the Langmuir isotherm model and was endothermic. E values obtained from the Dubinin–Radushkevich isotherm showed that the adsorption mechanism was chemical in nature.
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Membrane–solute interactions were found to play an important role during the process, suggesting the adsorption of the target compounds on the PES-UF membrane. 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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Although ≡ M – OH groups and positively charged auxochromes (N and/or S, see MB scheme) were expected to be the key components of adsorption, 3 their same FT-IR profiles should be evidence the chromophores ( π -electrons) of MB and H-bonds also took part in the adsorption mechanism. The adsorption was endothermic. 0) throughout the adsorption process.
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We can understand the adsorption mechanism and preferential binding sites of CO 2 and H 2 by considering the snapshots of the gas mixture in the MIL-88A structure with the variation of pressure.. Furthermore, while analyzing the obtained results, we also found the adsorption mechanism and preferential binding sites of MIL-88A(Fe and Sc) systems were similar to that of MIL-88A(V and Ti) in that order.
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Thermodynamic consideration reveals that adsorption caffeine on CT38 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 trend of the inhibiton efficiency with temperature and the values of some kinetic and thermodynamic parameters obtained.. Key words: Corrosion inhibition, steel, Langmuir adsorption isotherm, caffeine, KI.
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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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Retention in normal-phase chromatography is predominately based upon an adsorption mechanism. In the future, with the advent of new station- ary phases being developed, one should expect to see increasingly more interesting applications in the pharmaceutical industry.. Schunk, Retention mechanism and the role of the mobile phase in normal-phase separation on amino-bonded-phase columns, Anal.
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Polym., 85(2), pp.376-387.. (2018), “Insight into adsorption mechanism of lead(II) from aqueous solution by chitosan loaded MnO 2 nanoparticles”, Materials Chemistry and Physics, 207, pp.294-302.
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The pseudo-second order kinetic model suggests that the adsorption mechanism governs the adsorption process, and the adsorption rate of metal ions onto the gel can be controlled by chemical process through. sharing or electron exchange between the adsorbent and metal ions in solution.
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Yuan et al., 2019. while the situation is reversed for the hierarchical flower-like sodium titanate where an adsorption ratio of 98.6% and a capacity of 49.3 mg/g were obtained ( Feng et al., 2013. 120 mg Hang et al., 2018 ) LaB 6 [dye. 20 mg Wang et al., 2019. 6 b and S4, a much better fit was found for the Freundlich isotherm than Langmuir isotherm, implying that MB adsorption is better described by a multi- layer adsorption mechanism ( Yang et al., 2018.
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Representation of the adsorption mechanism of the adsorbed MY and VBB onto the hBN nanostructure via π-π stacking interplay.. (5) where q m is the maximum monolayer adsorption capacity of the adsorbent (mgg –1. and the constant b is related to the energy or the net enthalpy of the sorption process (Lmg –1 ) [18]. Effect of pH on the adsorption of MY (a) and VBB (b) onto the hBN nanostructure..
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Adsorption kinetics were investigated to investigate the adsorption mechanism, to determine the adsorption rate and to calculate the maximum adsorption capacity of magnetic coffee grains for the adsorption of heavy metals. Effect of heavy metal concentration on adsorption capacity. The comparison of heavy metal adsorption capacity of the different coffee-based sorbents used in literature.. Langmuir and Freundlich isotherms for magnetic coffee grains..