Red dye 40 removal by fixed-bed columns packed with alginate-chitosan sulfate hydrogels

Verduzco-Navarro, Ilse Paulina; Jasso-Gastinel, Carlos F.; Ríos-Donato, Nely; Mendizábal, Eduardo

doi:10.24275/rmiq/ia1123

Cited by 7 publications

(8 citation statements)

References 31 publications

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“…The higher q b can be explained by the larger number of active adsorbent sites available to interact with the solute before the solution leaves the column [ 51 ]. This is in accordance with literature reports that larger q b is obtained by increasing the bed height [ 52 , 53 , 54 ].…”

Section: Resultssupporting

confidence: 93%

“…Figure 7 and Table 3 show that when the length of the column was increased (higher amount of adsorbent), more volume was passed through the column before the breakthrough point was reached, and steeper curves were obtained, indicating greater efficiency. It has been reported that when plotting the breakthrough curves as a function of time, by increasing the length of the column, the curves become less steep [ 23 , 47 , 52 , 53 , 55 ] as the MTZ requires more time to reach the end of the column, which increases the breakthrough times [ 46 ].…”

Section: Resultsmentioning

confidence: 99%

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Removal of Cu(II) by Fixed-Bed Columns Using Alg-Ch and Alg-ChS Hydrogel Beads: Effect of Operating Conditions on the Mass Transfer Zone

et al. 2020

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The removal of Cu(II) ions from aqueous solutions at a pH of 5.0 was carried out using fixed-bed columns packed with alginate-chitosan (Alg-Ch) or alginate-chitosan sulfate (Alg-ChS) hydrogel beads. The effect of the initial Cu(II) concentration, flow rate, pH, and height of the column on the amount of Cu removed by the column at the breakpoint and at the exhaustion point is reported. The pH of the solution at the column’s exit was initially higher than that at the entrance, and then decreased slowly. This pH increase was attributed to proton transfer from the aqueous solution to the amino and COO− groups of the hydrogel. The effect of operating conditions on the mass transfer zone (MTZ) and the length of the unused bed (HLUB) is reported. At the lower flow rate and lower Cu(II) concentration used, the MTZ was completely developed and the column operated efficiently; by increasing column height, the MTZ has a better opportunity to develop fully. Experimental data were fitted to the fixed-bed Thomas model using a non-linear regression analysis and a good correspondence between experimental and Thomas model curves was observed.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Removal of Cu(II) by Fixed-Bed Columns Using Alg-Ch and Alg-ChS Hydrogel Beads: Effect of Operating Conditions on the Mass Transfer Zone

et al. 2020

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“…Curves similar to the one obtained in the present work have been reported [ 49 , 50 ]; after breakthrough occurred, the outflow concentration increased rapidly, then stabilized for a while, then increased again.…”

Section: Resultssupporting

confidence: 89%

Arsenate Removal from Aqueous Media Using Chitosan-Magnetite Hydrogel by Batch and Fixed-Bed Columns

Verduzco-Navarro

Mendizábal

Rivera-Mayorga

et al. 2022

Gels

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The removal of arsenate ions from aqueous solutions at near-neutral pH was carried out using chitosan-magnetite (ChM) hydrogel beads in batch systems. Equilibrium isotherms and kinetic studies are reported. Obtained equilibrium and kinetic data were fitted to mathematical models, estimating model parameters by non-linear regression analysis. Langmuir model was found to best fit equilibrium data; a maximum adsorption capacity of 66.9 mg As/g was estimated at pH 7.0. Pseudo-first order kinetic model was observed to best fit kinetic data. The pH of the solution was observed to increase with increasing contact time, which is attributed to protonation of amine groups present in the hydrogel. Protonation of functional groups in the ChM sorbent yields a higher number of active sites for arsenate removal, being as this a process that can’t be overlooked in future applications of ChM hydrogel for the removal or arsenate ions. Chitosan-magnetite and ChM-arsenate interactions were determined by XPS. Arsenate removal using fixed-bed column packed with ChM was carried out, reporting a non-ideal behavior attributed to pH increase of the effluent caused by proton transfer to ChM hydrogels.

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“…These solutions are developed under specific assumptions; for example, Langmuir isotherm and second-order reversible reaction kinetics apply in Thomas model while surface reaction theory and noninstantaneous equilibrium are assumed in Adams-Bohat equation . Still, they are only valid for a solid contained in the adsorption system with continuous feed of the liquid phase, a scenario not very suitable for the scale-up of some processes as the solid material could saturate quickly during operation (Verduzco-Navarro et al, 2020a), requiring adsorbent charge/discharge cycles and increased remediation times, whereas dynamic models exploring the continuous feed of adsorbent have yet to be reported.…”

Section: Introductionmentioning

confidence: 99%

Analytical and hybrid-neuro-differential approaches for describing contaminant removal from aqueous systems

Temoltzin-Lobatón

Estévez-Sánchez²,

Cruz-González³

et al. 2022

RMIQ

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Red dye 40 removal by fixed-bed columns packed with alginate-chitosan sulfate hydrogels

Abstract: Modelado de la biodegradación en biorreactores de lodos de hidrocarburos totales del petróleo intemperizados en suelos y sedimentos (Biodegradation modeling of sludge bioreactors of total petroleum hydrocarbons weathering in soil and sediments)

Cited by 7 publications

References 31 publications

Removal of Cu(II) by Fixed-Bed Columns Using Alg-Ch and Alg-ChS Hydrogel Beads: Effect of Operating Conditions on the Mass Transfer Zone

Removal of Cu(II) by Fixed-Bed Columns Using Alg-Ch and Alg-ChS Hydrogel Beads: Effect of Operating Conditions on the Mass Transfer Zone

Arsenate Removal from Aqueous Media Using Chitosan-Magnetite Hydrogel by Batch and Fixed-Bed Columns

Analytical and hybrid-neuro-differential approaches for describing contaminant removal from aqueous systems

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