Adsorption of volatile hydrocarbons on natural zeolite-clay material

Breus, I. P.; Denisova, Alexandra; Nekljudov, Sergey; Breus, Vladimir

doi:10.1007/s10450-008-9124-y

Cited by 9 publications

(2 citation statements)

References 15 publications

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“…The values of bulk density, true density, and porosity of the particle are shown in Table . The porosity can be considered low if compared with other clays, as studies by Breus et al showed particle porosity of 51 %.…”

Section: Resultsmentioning

confidence: 99%

Adsorption of toluene into commercial organoclay in liquid phase: Kinetics, equilibrium and thermodynamics

et al. 2015

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Organoclays are usually used as sorbents to reduce the spread of organic compounds and to remove them at contaminated sites. This study investigated the liquid-phase adsorption of toluene on organoclay (Spectrogel ® type C) of Brazilian company SpectroChem. In spite of not having a large amount of pores, this organoclay is a low-cost, effective adsorvent.Regarding the pH investigations, considerable effects of pH on the adsorption process were not observed. In the kinetics studies, it was observed that the process comes into equilibrium after 1 h with about 90 % of toluene removal. The experimental kinetic data were best fitted by mass transfer in external film model. For the equilibrium study, the best fit was by MSAM model at 288.15 K, Dubinin-Radushkevitch model at 298.15 K and Sips model at 308.15 K.Further, the thermodynamic parameters showed that the toluene adsorption on organoclay Spectrogel-C is an endothermic process. For tests of regeneration, ethanol was the eluent which proved more promising. This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 99%

Adsorption of toluene into commercial organoclay in liquid phase: Kinetics, equilibrium and thermodynamics

et al. 2015

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“…This behavior can be explained by the presence of the salt used in the organofilization process, which can occupy the active sites that would be available for the nitrogen. The porosity of the organoclay can also be considered low when compared to other materials, and its increase after the process may be due to the drag of the clay lamellas (He et al 2006;Breus et al 2008;Antonelli et al 2021). a Specific surface area by BET method; b volume of micropore (Eq.…”

Section: 2amentioning

confidence: 99%

Adsorção de antibiótico cefazolina sódica em argila organofílica Spectrogel tipo C

Pires Spaolonzi

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Emerging contaminants have been widely investigated due to their potential risk to human health and the environment, even at low concentrations. Antibiotics are one of the most used classes of pharmaceuticals in the world, and have been continuously discarded into the environment and detected in effluents and aqueous matrices. Cefazolin (CFZ) is an antibiotic widely used in both human and veterinary medicine, and leaves a high residual value in the environment. Conventional treatments have been shown to be inefficient or costly to remove these contaminants at low concentrations. Thus, this dissertation evaluated the removal of cefazolin from aqueous matrices by adsorption. For this purpose, adsorbent affinity tests were carried out with a variety of adsorbent materials and biomaterials, with the Spectrogel type C organophilic clay being selected as the most promising material. The experimental design of a rotational central composite design was carried out to evaluate the best conditions of initial concentration (0.132 mmol/L), adsorbent mass (0.448 g/50 mL solution) and adsorbent diameter (0.655 nm). Batch tests indicated that the resistance to external film mass transfer is the limiting step of the process and the Sips model best described the system at equilibrium. The maximum adsorption capacity (Langmuir fit) was 0.877 mmol/g at 25°C. The batch tests achieved an 80% removal at an equilibrium time of 72 hours. Through the thermodynamic study, it was possible to observe that the process is endothermic and spontaneous. Thermal regeneration was evaluated, as well as a simplified batch design, which indicated the need for 112 g of Spectrogel for a volume of 10 L of CFZ solution, with a maximum removal of 90%. Adsorption in a continuous dynamic system was also analyzed. The tests took place in a fixed bed column packed with Spectrogel. The system operating with the condition of initial concentration of 0.5 mmol/L and flow rate of 0.1 mL/min provided the highest adsorption capacity of cefazolin (20 µmol/g), but the system with the condition of initial concentration of 0.3 mmol/L and flow rate of 0.1 mL/min promoted the lowest mass transfer zone value (5.88 cm). The DualSD model was the one that best described the process rupture curves. The molecular modeling of CFZ was evaluated, indicating a stable and poorly reactive molecule when compared to other drugs. The clay characterization analyzes before and after the adsorption process indicate that it is a predominantly amorphous, non-porous clay, with low surface area and stable, without major modifications after the process.

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Adsorption of antibiotic cefazolin in organoclay fixed-bed column: characterization, mathematical modeling, and DFT-based calculations

Spaolonzi

Silva

Vieira

2022

Environ Sci Pollut Res

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Adsorption of volatile hydrocarbons on natural zeolite-clay material

Cited by 9 publications

References 15 publications

Adsorption of toluene into commercial organoclay in liquid phase: Kinetics, equilibrium and thermodynamics

Adsorption of toluene into commercial organoclay in liquid phase: Kinetics, equilibrium and thermodynamics

Adsorção de antibiótico cefazolina sódica em argila organofílica Spectrogel tipo C

Adsorption of antibiotic cefazolin in organoclay fixed-bed column: characterization, mathematical modeling, and DFT-based calculations

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