Determination and analysis of CO2 capture kinetics and mechanisms on the novel graphene-based adsorbents

Kudahi, Saeed Nazari; Noorpoor, Ali Reza; Mahmoodi, Niyaz Mohammad

doi:10.1016/j.jcou.2017.06.010

Cited by 55 publications

(15 citation statements)

References 44 publications

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“…According to the Boyd’s film-diffusion model, if the plot is linear and passes through the starting point, it verifies that the mass transfer rate is indeed controlled by pore (intraparticle) diffusion. Otherwise, the adsorption rate is also controlled by the film-diffusion mechanism Figure b shows the plots of Boyd’s film-diffusion model.…”

Section: Resultsmentioning

confidence: 99%

“…Although reactionbased kinetic models are important in predicting the adsorption behavior of adsorbents, they do not provide an in-depth understanding of process mechanisms that control adsorption kinetics. 62 Therefore, rate-limiting kinetic models 51,55 such as intraparticle diffusion, Boyd's film-diffusion, and mass transfer model were applied to illuminate the process mechanisms in the adsorption of VOCs by the Fe 3 O 4 /AC@ SiO 2 @1,4-DAAQ nanoparticles. The equations of the ratelimiting kinetic models applied and the parameters calculated from these models are shown in Table 3, and the plots are shown in Figure 8.…”

Section: Regression Model Validation and Statisticalmentioning

confidence: 99%

“…Otherwise, the adsorption rate is also controlled by the film-diffusion mechanism. 62 Figure 8b shows the plots of Boyd's filmdiffusion model. As shown in Figure 8b, nonlinear plots of B t versus time (t) confirm that adsorption is not only influenced by intraparticle diffusion.…”

Section: Regression Model Validation and Statisticalmentioning

confidence: 99%

See 2 more Smart Citations

Development of Novel Fe₃O₄/AC@SiO₂@1,4-DAAQ Magnetic Nanoparticles with Outstanding VOC Removal Capacity: Characterization, Optimization, Reusability, Kinetics, and Equilibrium Studies

Ece

Kutluay

Şahi̇n

et al. 2020

Ind. Eng. Chem. Res.

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The adsorption of pollutants to the surface of adsorbents plays a critical role in the effectiveness of adsorption technology for air purification applications. Herein, novel magnetic nanoparticles functionalized with 1,4diaminoanthraquinone (1,4-DAAQ), namely, Fe 3 O 4 /activated carbon (AC)@SiO 2 @ 1,4-DAAQ, were innovatively synthesized via co-precipitation and sol−gel techniques. After that, these nanoparticles were used for high-efficiency removal of volatile organic compounds (VOCs) (i.e., benzene and toluene). The synthesized nanoparticles were characterized by various techniques such as Fourier transform IR spectroscopy, thermogravimetric analysis/differential thermal analysis, scanning electron microscopy, and Brunauer−Emmett−Teller analysis. The dynamic adsorption process of VOCs was optimized based on operating parameters. The adsorption experiments revealed that Fe 3 O 4 /AC@SiO 2 @1,4-DAAQ showed exceptional performance for the removal of VOCs. It was observed that for benzene, Fe

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Section: Resultsmentioning

confidence: 99%

Section: Regression Model Validation and Statisticalmentioning

confidence: 99%

See 1 more Smart Citation

Development of Novel Fe₃O₄/AC@SiO₂@1,4-DAAQ Magnetic Nanoparticles with Outstanding VOC Removal Capacity: Characterization, Optimization, Reusability, Kinetics, and Equilibrium Studies

Ece

Kutluay

Şahi̇n

et al. 2020

Ind. Eng. Chem. Res.

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“…To further understand the adsorption nature, the kinetic behavior of the S/C‐TiO 2 ‐0.5 sample was studied. The adsorption mechanism was quantified using pseudo‐first‐order and pseudo‐second‐order equations :

\ln (q_{normale} - q_{normalt}) = \ln q_{normale} K_{1} t

\frac{t}{q_{t}} = \frac{1}{k_{2} q_{normale}^{2}} + (\frac{1}{q_{normale}}) t

where k 1 (min −1 ) and k 2 (g mg −1 min −1 ) are the pseudo‐first‐order and pseudo‐second‐order rate constants, respectively; and q e and q t (mg g −1 ) are the amounts of metal ions adsorbed onto the adsorbent at the equilibrium time and time t , respectively. The value of k 1 can be calculated from the slope of the linear plot of ln( q e − q t ) versus t .…”

Section: Resultsmentioning

confidence: 99%

Sulfur and Carbon Co‐doped TiO₂ Composite Fabricated by Lignosulphonate and Its Suitability for Removal of Cadmium

Zou

Shang

Wang

et al. 2019

CLEAN Soil Air Water

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Highly toxic divalent cadmium causes serious environmental issues. To quickly monitor and/or efficiently remove this potentially toxic metal ion as well as to explore its interfacial chemistry with metal oxides, a sulfur and carbon co-doped titania (S/C-TiO 2 ) composite is synthesized via a facile sol-gel method with the assistance of sodium lignosulphonate (SLS). The prepared composite displays a well-crystallized TiO 2 nanostructure comprising the anatase phase. Both S and C, which are derived from the SLS template, are found to enter the TiO 2 lattice. The S/C-TiO 2 composite exhibits a porous structure with a wide pore size distribution. The newly synthesized composite shows adsorption capability for the potentially toxic metal Cd(II). The adsorption process requires <5 min to reach equilibrium. The measured equilibrium adsorption capacity is 19.42 mg g −1 , which is twice as high as that of bare TiO 2 . The removal efficiency is as high as 97%. Moreover, the materials are suitable for contaminated solutions over a wide range of pH values and various initial cadmium concentrations. A mechanism for the enhanced adsorption behavior is also proposed.

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“…In the pseudo-first-order model, the adsorption rate is assumed to be proportional to the number of vacant adsorption sites, and adsorption occurs as a reversible interaction between the adsorbent and the adsorbate. Hence, this model is suitable for describing physical adsorption process. , The equation is expressed as follows where q e and q t are the adsorption capacities (mg/g) at equilibrium and at time t , respectively. k 1 (min –1 ) is the equilibrium rate constant of the pseudo-first-order model.…”

Section: Experimental Sectionmentioning

confidence: 99%

Hydration Activation of MgO Pellets for CO₂ Adsorption

Ding

Zhao

Chen

et al. 2021

Ind. Eng. Chem. Res.

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Mesoporous MgO is a promising candidate for CO 2 capture. In this study, MgO pellets were activated via hydration and the effects of the process on the texture, structures, and CO 2 adsorption properties of the pelletized MgO adsorbents were systematically studied. Two adsorption kinetics models were used to investigate the CO 2 adsorption kinetics of the pelletized MgO adsorbents. Simultaneously, their kinetic parameters and the influence of adsorption temperatures were determined. It was found that a 3D, flaky, inter-connected network structure appeared after hydration. The hydration process significantly improved the pore structure of the adsorbent and thereby improved the CO 2 adsorption capacity and equilibrium rate constant. The increase in CO 2 adsorption capacity was attributed to the development of their structure rather than the reaction of Mg(OH) 2 with CO 2 . The results of a kinetics study showed that a pseudo-second-order model was suitable for predicting the entire adsorption process. Meanwhile, the equilibrium kinetics rate constant of CO 2 capture increased with adsorption temperature, but the initial adsorption rate was mainly related to the texture and structures of the adsorbents. Consequently, hydration by steam or liquid water was deemed an effective method for improving the adsorption performance of MgO pellets, and the hydrated adsorbents were suitable for use in practical CO 2 capture.

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Determination and analysis of CO2 capture kinetics and mechanisms on the novel graphene-based adsorbents

Cited by 55 publications

References 44 publications

Development of Novel Fe₃O₄/AC@SiO₂@1,4-DAAQ Magnetic Nanoparticles with Outstanding VOC Removal Capacity: Characterization, Optimization, Reusability, Kinetics, and Equilibrium Studies

Development of Novel Fe₃O₄/AC@SiO₂@1,4-DAAQ Magnetic Nanoparticles with Outstanding VOC Removal Capacity: Characterization, Optimization, Reusability, Kinetics, and Equilibrium Studies

Sulfur and Carbon Co‐doped TiO₂ Composite Fabricated by Lignosulphonate and Its Suitability for Removal of Cadmium

Hydration Activation of MgO Pellets for CO₂ Adsorption

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Determination and analysis of CO2 capture kinetics and mechanisms on the novel graphene-based adsorbents

Cited by 55 publications

References 44 publications

Development of Novel Fe3O4/AC@SiO2@1,4-DAAQ Magnetic Nanoparticles with Outstanding VOC Removal Capacity: Characterization, Optimization, Reusability, Kinetics, and Equilibrium Studies

Development of Novel Fe3O4/AC@SiO2@1,4-DAAQ Magnetic Nanoparticles with Outstanding VOC Removal Capacity: Characterization, Optimization, Reusability, Kinetics, and Equilibrium Studies

Sulfur and Carbon Co‐doped TiO2 Composite Fabricated by Lignosulphonate and Its Suitability for Removal of Cadmium

Hydration Activation of MgO Pellets for CO2 Adsorption

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Product

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Development of Novel Fe₃O₄/AC@SiO₂@1,4-DAAQ Magnetic Nanoparticles with Outstanding VOC Removal Capacity: Characterization, Optimization, Reusability, Kinetics, and Equilibrium Studies

Development of Novel Fe₃O₄/AC@SiO₂@1,4-DAAQ Magnetic Nanoparticles with Outstanding VOC Removal Capacity: Characterization, Optimization, Reusability, Kinetics, and Equilibrium Studies

Sulfur and Carbon Co‐doped TiO₂ Composite Fabricated by Lignosulphonate and Its Suitability for Removal of Cadmium

Hydration Activation of MgO Pellets for CO₂ Adsorption