Elucidating the mass transfer mechanism of CrVI adsorption by encapsulated chitosan-carbon nanotubes-iron beads in packed-bed columns

Aslam, Mian Muhammad Ahson; Den, Walter; Kuo, Hsion-Wen

doi:10.1016/j.jwpe.2022.102586

Cited by 11 publications

(4 citation statements)

References 46 publications

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“…In this present work, the adsorption process in a fixed bed column is modeled considering the following hypotheses [32][33][34]: this is an isothermal system; no chemical reaction occurs; there is negligible radial dispersion; the adsorbent particles are uniform; the flow rate is constant; there is a constant axial dispersion coefficient; there is constant porosity.…”

Section: Mass Balancementioning

confidence: 99%

Mathematical Evaluation of Direct and Inverse Problem Applied in Breakthrough Models of Metal Adsorption

Soeiro,

Moura,

Dias

et al. 2024

Applied Sciences

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The treatment of industrial effluents has great environmental and human health importance. The purification of water from polluting components, such as metals and organic compounds, can be considered one of the main applications in this field, with adsorption being one of the main treatment methods. Therefore, with the objective of describing the dynamics of the process in an adsorption column and estimating the parameters involved, in this work, an algorithm for the Method of Lines (MOL) was used in order to numerically solve the model formed by the mass balance in liquid phase, the linear driving force equation (LDF), and the Langmuir isotherm for equilibrium. In addition, a sensitivity analysis of the phenomenon was carried out in relation to the parameters and a subsequent estimation of these was made through the Monte Carlo technique via the Markov chain (MCMC). The validation algorithm was created using data from actual breakthrough curves found in the literature. The experimental data were obtained from the literature for the adsorption of Cadmium (Cd), Copper (Cu), Nickel (Ni), Zinc (Zn), and Chrome (Cr) ions. Among all the estimates, the one that had the lowest adjustment to the data was that related to zinc metal, which had an R2 equal to 0.8984. For the other metals, the correlation coefficient had a value closer to unity. This demonstrates that, in general, the estimates were good enough to represent the dynamics of adsorption.

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Section: Mass Balancementioning

confidence: 99%

Mathematical Evaluation of Direct and Inverse Problem Applied in Breakthrough Models of Metal Adsorption

Soeiro,

Moura,

Dias

et al. 2024

Applied Sciences

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“…The utilization of CNTs-based adsorbents for future practical applications should be evaluated. Therefore, the separation behaviors of a chitosan–multiple-walled CNTs–iron (CS–MWCNTs–Fe)-based continuous-flow column was tested, and around 54% Cr(VI) removal could be achieved (water flow rate = 1 mL/min, feed Cr-VI concentration = 30 mg/L, packed bed height = 8 cm) [ 32 ]. The vertical and uniform growing of CNTs on carbon nanofibers (CNFs) could enhance the specific surface area (398.127 m 2 /g) and create a higher adsorption capacity toward Cr(VI) (150 mg/g) within an hour, and 227 mg/g at equilibrium could be observed [ 33 ].…”

Section: Cr Removal: the Developed Adsorbentsmentioning

confidence: 99%

Removal of Chromium Species by Adsorption: Fundamental Principles, Newly Developed Adsorbents and Future Perspectives

et al. 2023

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Emerging chromium (Cr) species have attracted increasing concern. A majority of Cr species, especially hexavalent chromium (Cr(VI)), could lead to lethal effects on human beings, animals, and aquatic lives even at low concentrations. One of the conventional water-treatment methodologies, adsorption, could remove these toxic Cr species efficiently. Additionally, adsorption possesses many advantages, such as being cost-saving, easy to implement, highly efficient and facile to design. Previous research has shown that the application of different adsorbents, such as carbon nanotubes (carbon nanotubes (CNTs) and graphene oxide (GO) and its derivatives), activated carbons (ACs), biochars (BCs), metal-based composites, polymers and others, is being used for Cr species removal from contaminated water and wastewater. The research progress and application of adsorption for Cr removal in recent years are reviewed, the mechanisms of adsorption are also discussed and the development trend of Cr treatment by adsorption is proposed.

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“…However, the sorption capacity of the composite beads decreased to about 50% after the fourth cycle of adsorption. For removal of various species of Cr(VI) from aqueous solution, including Cr 2 O 7 2− , CrO 4 − , and CrO 4 2− , CS has been either modified with zirconium-based MOFs (MOF-808) [ 167 ], graphene oxide [ 167 ], or carbon nanotubes and iron [ 174 ]. According to the Langmuir model, MOF-808/CS composites exhibited, at pH 5, a maximum Cr(VI) sorption capacity of 320.0 mg/g1.…”

Section: Polysaccharide-based Composite Hydrogels Applied In Wastewat...mentioning

confidence: 99%

“…The GO/CS aerogels showed good reusability, with the removal efficiency decreasing to about 58% after the fifth cycle of adsorption. Recently, an interesting study on Cr(VI) removal using a continuous-flow column packed with CS/carbon nanotubes/iron composite beads has been reported by Aslam et al [ 174 ]. A maximum of 54% of Cr(VI) ion removal was achieved at a feed concentration of 30 mg/L, a flow rate of 1 mL/min, and a bed height of 8 cm.…”

Section: Polysaccharide-based Composite Hydrogels Applied In Wastewat...mentioning

confidence: 99%

Polysaccharide-Based Composite Hydrogels as Sustainable Materials for Removal of Pollutants from Wastewater

Ghiorghiță¹,

Dinu²,

Lazăr³

et al. 2022

Molecules

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Nowadays, pollution has become the main bottleneck towards sustainable technological development due to its detrimental implications in human and ecosystem health. Removal of pollutants from the surrounding environment is a hot research area worldwide; diverse technologies and materials are being continuously developed. To this end, bio-based composite hydrogels as sorbents have received extensive attention in recent years because of advantages such as high adsorptive capacity, controllable mechanical properties, cost effectiveness, and potential for upscaling in continuous flow installations. In this review, we aim to provide an up-to-date analysis of the literature on recent accomplishments in the design of polysaccharide-based composite hydrogels for removal of heavy metal ions, dyes, and oxyanions from wastewater. The correlation between the constituent polysaccharides (chitosan, cellulose, alginate, starch, pectin, pullulan, xanthan, salecan, etc.), engineered composition (presence of other organic and/or inorganic components), and sorption conditions on the removal performance of addressed pollutants will be carefully scrutinized. Particular attention will be paid to the sustainability aspects in the selected studies, particularly to composite selectivity and reusability, as well as to their use in fixed-bed columns and real wastewater applications.

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Elucidating the mass transfer mechanism of CrVI adsorption by encapsulated chitosan-carbon nanotubes-iron beads in packed-bed columns

Cited by 11 publications

References 46 publications

Mathematical Evaluation of Direct and Inverse Problem Applied in Breakthrough Models of Metal Adsorption

Mathematical Evaluation of Direct and Inverse Problem Applied in Breakthrough Models of Metal Adsorption

Removal of Chromium Species by Adsorption: Fundamental Principles, Newly Developed Adsorbents and Future Perspectives

Polysaccharide-Based Composite Hydrogels as Sustainable Materials for Removal of Pollutants from Wastewater

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