Sorption kinetics and isotherm studies of a Reactive Black 5 dye on chitosan hydrogel beads modified with various ionic and covalent cross-linking agents

Jóźwiak, Tomasz; Filipkowska, Urszula

doi:10.1016/j.jece.2019.103564

Cited by 22 publications

(19 citation statements)

References 25 publications

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“…The increase in GA concentration produced a higher consumption of the amino groups in the crosslinking reaction. Consequently, the crosslinked CS beads had a lower ability to bind to water molecules due to reduced active sites [ 28 , 29 ].…”

Section: Resultsmentioning

confidence: 99%

“…This behavior was explained because CS is a weak base with a pKa of around 6.4 [ 31 ]. Therefore, at a pH value below pKa , the amino groups in the CS molecules ionize into ammonium ions, acting as repulsive forces between polymer chains, allowing a higher swelling degree [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, at a pH above pKa , a more significant number of OH − ions are produced in the medium, and consequently, the protonation of the amino groups is minimal, leading to a low swelling degree [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

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Optimization of Chitosan Glutaraldehyde-Crosslinked Beads for Reactive Blue 4 Anionic Dye Removal Using a Surface Response Methodology

Galan

Trilleras

Zapata

et al. 2021

Life

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The use of dyes at an industrial level has become problematic, since the discharge of dye effluents into water disturbs the photosynthetic activity of numerous aquatic organisms by reducing the penetration of light and oxygen, in addition to causing carcinogenic diseases and mutagenic effects in humans, as well as alterations in different ecosystems. Chitosan (CS) is suitable for removing anionic dyes since it has favorable properties, such as acquiring a positive charge and a typical macromolecular structure of polysaccharides. In this study, the optimization of CS beads crosslinked with glutaraldehyde (GA) for the adsorption of reactive blue dye 4 (RB4) in an aqueous solution was carried out. In this sense, the response surface methodology (RSM) was applied to evaluate the concentration of CS, GA, and sodium hydroxide on the swelling degree in the GA-crosslinked CS beads. In the same way, RSM was applied to optimize the adsorption process of the RB4 dye as a function of the initial pH of the solution, initial concentration of the dye, and adsorbent dose. The crosslinking reaction was investigated by scanning electron microscopy (SEM), Fourier transformed infrared spectroscopy (FTIR), and X-ray diffractometry (XRD). The design described for the swelling degree showed an R2 (coefficient of determination) adjusted of 0.8634 and optimized concentrations (CS 3.3% w/v, GA 1.7% v/v, and NaOH 1.3 M) that were conveniently applied with a concentration of CS at 3.0% w/v to decrease the viscosity and facilitate the formation of the beads. In the RB4 dye adsorption design, an adjusted R2 (0.8280) with good correlation was observed, where the optimized conditions were: pH = 2, adsorbent dose 0.6 g, and initial concentration of RB4 dye 5 mg/L. The kinetic behavior and the adsorption isotherm allowed us to conclude that the GA-crosslinked CS beads’ adsorption mechanism was controlled mainly by chemisorption interactions, demonstrating its applicability in systems that require the removal of contaminants with similar structures to the model presented.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Optimization of Chitosan Glutaraldehyde-Crosslinked Beads for Reactive Blue 4 Anionic Dye Removal Using a Surface Response Methodology

Galan

Trilleras

Zapata

et al. 2021

Life

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“…Sorbents based on chitosan can exhibit much better sorption properties than the activated carbons do. In the case of anionic dyes, its maximum sorption capacity may reach Q max = 1500-2500 mg/g (Jóźwiak and Filipkowska 2019). The high sorptive capacity of chitosan results from primary amine groups, which are the main sorption centers for most of the pollutants having a negative charge in the solution ).…”

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confidence: 99%

The use of aminated cotton fibers as an unconventional sorbent to remove anionic dyes from aqueous solutions

et al. 2020

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This study aimed to investigate the sorption of anionic dyes (Reactive Black 5, Reactive Yellow 84, Acid Red 18, and Acid Yellow 23) by cotton fibers aminated with epichlorohydrin and ammonia water (ACFs) as well by unmodified cotton fibers (CFs). CFs and ACFs were characterized based on FTIR, elemental analysis (C/N content) and pH PZC . The effect of solution pH (pH 2-11) and contact time on the removal of dye was studied as well. The kinetic experimental data were fitted to pseudo-first order, pseudo-second order, and intraparticle diffusion model. Equilibrium isotherms were analyzed based on Langmuir and Freundlich isotherms. The efficiency of dye sorption on CFs was the most effective at pH 2, whereas on ACFs-at pH 3-4. ACFs and CFs changed the pH value of the sorption solution. The system tended to obtain a pH value close to the pH PZC value of the sorbent (pH PZC = 7.85 for CFs/pH PZC = 8.15 for ACFs). ACFs had a shorter dye sorption equilibrium time compared to the CFs. The sorption of dyes on cotton sorbents proceeded in 2 main phases. The best match to the experimental data was shown by the pseudo-secondary model. Having amine functional groups, the ACFs ensured far better sorption of anionic dyes than CFs did. The maximum Reactive Black 5 sorption capacity of ACFs was Q max = 36.77 mg/g, which was 1240% higher than that of CFs (Q max-= 2.74 mg/g).

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“…Once properly prepared, it can exhibit a multiply higher sorption capacity than the commercial activated carbons 9 . With regard to anionic dyes, which are the most common contaminants found in wastewater from the dyeing industry, the sorption capacity of chitosan-based sorbents can reach up to Q max > 2000 mg/g 10 , mainly due to their basic character, being unusual for biopolymers, caused by the presence of amine groups in their structure. The positively-charged surface of chitosan sorbents interacts electrostatically with dye anions, thereby significantly enhancing dye sorption 11 .…”

Section: Introductionmentioning

confidence: 99%

The use of air-lift adsorber with a floating filling from a cross-linked chitosan hydrogels for Reactive Black 5 removal

Jóźwiak

Filipkowska

2021

Sci Rep

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This work substantially extends knowledge on the possibilities of treating colored industrial wastewater via sorption under flow conditions. The presented study aimed to determine the effectiveness of Reactive Black 5 (RB5) dye sorption from aqueous solutions under dynamic (flow) conditions in an unconventional air-lift type loop reactor with a filling made of hydrogel chitosan sorbents. The dye was removed from mono-component solutions (deionized water + RB5) and synthetic dyeing wastewater containing RB5 dye, NaCl (3 g/L), and an anti-creasing agent—UNICREASE JET (2 g/L). The sorbents tested in the study included: unmodified chitosan (CHs), chitosan ionically cross-linked with sodium citrate (CHs-CIT), and chitosan covalently cross-linked with epichlorohydrin (CHs-ECH). Each experimental series aimed to determine: the bed break-through time (CE = 0.1 C0), time of depletion of the sorbent’s sorption properties (CE = C0), and maximal sorption capacity of the sorbents (Qmax). The data obtained under dynamic conditions were described using Thomas, Yoon–Nelson, and Bohart–Adams models. The volume of the solution effectively treated in the air-lift reactor was significantly affected by chitosan sorbent type. At C0 = 50 mg RB5/L, the adsorber with the filling made of 1 g d.m. CHs allowed for the effective treatment of 4.6 L of synthetic wastewater (Qmax = 1504.7 mg/g), whereas CHs-ECH ensured 34.6 L of the treated solution (Qmax = 3212.9 mg/g).

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Sorption kinetics and isotherm studies of a Reactive Black 5 dye on chitosan hydrogel beads modified with various ionic and covalent cross-linking agents

Cited by 22 publications

References 25 publications

Optimization of Chitosan Glutaraldehyde-Crosslinked Beads for Reactive Blue 4 Anionic Dye Removal Using a Surface Response Methodology

Optimization of Chitosan Glutaraldehyde-Crosslinked Beads for Reactive Blue 4 Anionic Dye Removal Using a Surface Response Methodology

The use of aminated cotton fibers as an unconventional sorbent to remove anionic dyes from aqueous solutions

The use of air-lift adsorber with a floating filling from a cross-linked chitosan hydrogels for Reactive Black 5 removal

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