Facile fabrication of magnetic chitosan hydrogel beads and modified by interfacial polymerization method and study of adsorption of cationic/anionic dyes from aqueous solution

Jamali, M; Akbari, Ahmad

doi:10.1016/j.jece.2021.105175

Cited by 80 publications

(21 citation statements)

References 54 publications

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“…e adsorption behavior of the chitosan gel microbeads results in a saturated curve, which ts the Langmuir isotherm model of monolayer adsorption, yielding a q max value of 1.84 g-dye/g-adsorbent (Figure 4(b)) with an adsorption equilibrium (K) of 143 L/g. e obtained q max was one of the highest values reported for dye adsorption in similar chitosan gel adsorbent systems (Jóźwiak et al, 2017;Muedas-Taipe et al, 2020;Jamali and Akbari, 2021). e value of the maximum adsorption capacity provided insight into a 1 : 1 stoichiometric ratio of interaction between the protonated amino groups (-NH 3…”

Section: E Ect Of Ph On Dye Adsorptionmentioning

confidence: 79%

Biodegradable Crosslinked Chitosan Gel Microbeads with Controlled Size, Prepared by Membrane Emulsification-External Gelation and Their Application as Reusable Adsorption Materials

Kalidason

Saito

Nanbu

et al. 2022

J. Chem. Eng. Japan

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Gel microbeads composed of chitosan biopolymers were synthesized via membrane emulsi cation, as novel adsorbents for the adsorption of anionic azo dye (Acid Orange 7 (AO7)) and protein (bovine serum albumin (BSA)). The synthesis route involved the production of size-controlled water-in-oil emulsion droplets containing the chitosan solution using a porous, hydrophobic polytetra uoroethylene membrane. The resulting size-controlled emulsion droplets were successfully converted into stable gel microbeads via external gelation, followed by chemical crosslinking using ethylene glycol diglycidyl ether (EGDE). Scanning electron microscopy results revealed the size of the gel microbeads having a diameter ranging from 15 to 20 µm, which was comparable to the size of the emulsion droplets. The e ect of the crosslinking reaction between the prepared gel microbeads with EGDE was con rmed via Fourier transform infrared spectroscopy. The batch adsorption studies employed the Langmuir adsorption model with maximum adsorption capacities at pH values of 5 and 6 for AO7 dye (q max 1.84 g/g) and BSA (q max 0.87 g/g), respectively, with electrostatic interaction being the dominant mechanism of adsorption for both the azo dye and protein. The prepared crosslinked chitosan gel microbeads in this study exhibited excellent recyclability up to 30 times without a decline in their adsorptive capacities, a shelf life of >100 d, and a fair susceptibility toward enzymatic biodegradation, making them some of the most e ective and versatile green adsorbents for wastewater treatment.

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Section: E Ect Of Ph On Dye Adsorptionmentioning

confidence: 79%

Biodegradable Crosslinked Chitosan Gel Microbeads with Controlled Size, Prepared by Membrane Emulsification-External Gelation and Their Application as Reusable Adsorption Materials

Kalidason

Saito

Nanbu

et al. 2022

J. Chem. Eng. Japan

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“…Even with CBY the sorption capacity increased in time, reaching lower values around 180 mg/g. This difference can be attributed to the smaller dimensions of the molecule of IC (MW IC = 466.35 g/mol, MW CBY = 831.02 g/mol) that favor its penetration inside the structure of GO-CS aerogels [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

Graphene Oxide-Chitosan Aerogels: Synthesis, Characterization, and Use as Adsorbent Material for Water Contaminants

Pinelli

Nespoli

Rossi

2021

Gels

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Porous aerogels, formed by subjecting precursor hydrogels using a freeze-drying process, are certainly one of the most studied and synthetized soft materials, thanks to their important features such as elasticity, swelling behavior, softness, and micro and nanosized pores, which guarantee their applicability in various fields. Typically, these systems are synthetized working with natural or synthetic polymers, but in the last years great interest has been given to proper formulated aerogels able to combine polymeric structures with other moieties such as graphene or graphene oxide. This working strategy can be pivotal in many cases to tune important properties of the final system such as toughness, porosity, elasticity, electrical conductivity, or responsive behavior. In this work we propose the synthesis of chitosan graphene oxide aerogels obtained through self-assembly of graphene oxide sheets and chitosan chains. These three-dimensional systems were chemically characterized with IR and XRD technique and their inner structure was investigated through the scanning electron microscopy (SEM). Moreover, we mechanically characterized the material through dynamic mechanical analysis, showing the stability of these systems. Finally, the adsorption ability of these soft materials has been demonstrated using model molecules to simulate water contaminants showing the efficacy of those graphene-based systems even for the removal of anionic dyes. Complete removal of contaminants was obtained at low concentration of dyes in solution (100 mg/L), while with a higher amount of pollutant in the solution (350 mg/L) high sorption capacity (q > 200 mg/g) was observed.

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“…Magnetic chitosan hydrogel beads, based on chitosan biopolymer, magnetic graphene oxide nanoparticles (GO/Fe 3 O 4 ), and isophthaloyl chloride, were prepared and used in the removal of cationic and anionic dyes from an aqueous solution [ 65 ]. Experimental results showed that data were best-fitted to the pseudo-second-order kinetic model and non-linear Langmuir isotherm.…”

Section: Adsorbents For the Removal Of Anionic And Cationic Dyes From Watersmentioning

confidence: 99%

Organic Dyes versus Adsorption Processing

López

2021

Molecules

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Even in the first quarter of the XXI century, the presence of organic dyes in wastewaters was a normal occurrence in a series of countries. As these compounds are toxic, their removal from these waters is a necessity. Among the separation technologies, adsorption processing appeared as one of the most widely used to reach this goal. The present work reviewed the most recent approaches (first half of the 2021 year) regarding the use of a variety of adsorbents in the removal of a variety of organic dyes of different natures.

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Facile fabrication of magnetic chitosan hydrogel beads and modified by interfacial polymerization method and study of adsorption of cationic/anionic dyes from aqueous solution

Cited by 80 publications

References 54 publications

Biodegradable Crosslinked Chitosan Gel Microbeads with Controlled Size, Prepared by Membrane Emulsification-External Gelation and Their Application as Reusable Adsorption Materials

Biodegradable Crosslinked Chitosan Gel Microbeads with Controlled Size, Prepared by Membrane Emulsification-External Gelation and Their Application as Reusable Adsorption Materials

Graphene Oxide-Chitosan Aerogels: Synthesis, Characterization, and Use as Adsorbent Material for Water Contaminants

Organic Dyes versus Adsorption Processing

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