Comparative study of uncoated and tetraethylorthosilicate-coated magnetic chitosan beads in the adsorption of two textile dyes

Santillan, Fátima A.; Mejía, Ily Marilú Maza; Goicoechea, Héctor C.

doi:10.1007/s13762-023-04769-0

Cited by 2 publications

(3 citation statements)

References 44 publications

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“…One can note that the authors selected one dye model molecule (regularly) or a combination of two or more such molecules (less frequently) and that the working parameters were represented by the initial concentrations of the adsorbate and of the adsorbent, the pH, the temperature, the contact time, and the stirring speed. Most of the articles studied the influence of each factor separately, but there are also papers in which optimization processes were carried out by response surface methodology [ 36 , 62 , 63 ] or with the help of artificial neural network [ 64 ]. This sub-section includes appreciation of the influence of pH, of the employed adsorbent quantity, and of the stirring speed.…”

Section: Resultsmentioning

confidence: 99%

“…Santillan et al [ 62 ] synthesized magnetic chitosan beads and introduced them into aqueous solutions of Synozol red and Synozol yellow. They included extreme acid and basic pH and noticed that efficient dyes removal takes place at pH 2 due to the electrostatic interactions between the amino groups of the adsorbent and the sulfonic groups of the target molecules.…”

Section: Resultsmentioning

confidence: 99%

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Hydrogels Based on Chitosan and Nanoparticles and Their Suitability for Dyes Adsorption from Aqueous Media: Assessment of the Last-Decade Progresses

Grigoraș,

Simion,

Drob

2024

Gels

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Water is one of the fundamental resources for the existence of humans and the environment. Throughout time, due to urbanization, expanding population, increased agricultural production, and intense industrialization, significant pollution with persistent contaminants has been noted, placing the water quality in danger. As a consequence, different procedures and various technologies have been tested and used in order to ensure that water sources are safe for use. The adsorption process is often considered for wastewater treatment due to its straightforward design, low investment cost, availability, avoidance of additional chemicals, lack of undesirable byproducts, and demonstrated significant efficacious potential for treating and eliminating organic contaminants. To accomplish its application, the need to develop innovative materials has become an essential goal. In this context, an overview of recent advances in hydrogels based on chitosan and nanocomposites and their application for the depollution of wastewater contaminated with dyes is reported herein. The present review focuses on (i) the challenges raised by the synthesis process and characterization of the different hydrogels; (ii) the discussion of the impact of the main parameters affecting the adsorption process; (iii) the understanding of the adsorption isotherms, kinetics, and thermodynamic behavior; and (iv) the examination of the possibility of recycling and reusing the hydrogels.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Hydrogels Based on Chitosan and Nanoparticles and Their Suitability for Dyes Adsorption from Aqueous Media: Assessment of the Last-Decade Progresses

Grigoraș,

Simion,

Drob

2024

Gels

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“…It is worth noting that the stabilization of CS on the support can be improved via CS cross-linking. As cross-linking agents, a number of compounds have been utilized including glutaraldehyde [ 40 , 41 , 42 ], genipin [ 36 , 43 , 44 ], and sodium tripolyphosphate (TPP) [ 45 , 46 , 47 ]. Glutaraldehyde is a popular cross-linking agent because its aldehyde groups immediately form covalent bonds with amino groups.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Nanoparticle Support with an Ultra-Thin Chitosan Layer Preserves the Catalytic Activity of the Immobilized Glucose Oxidase

Tikhonov,

Lisichkin,

Sulman

et al. 2024

Nanomaterials

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Here, we developed magnetically recoverable biocatalysts based on magnetite nanoparticles coated with an ultra-thin layer (about 0.9 nm) of chitosan (CS) ionically cross-linked by sodium tripolyphosphate (TPP). Excessive CS amounts were removed by multiple washings combined with magnetic separation. Glucose oxidase (GOx) was attached to the magnetic support via the interaction with N-hydroxysuccinimide (NHS) in the presence of carbodiimide (EDC) leading to a covalent amide bond. These steps result in the formation of the biocatalyst for D-glucose oxidation to D-gluconic acid to be used in the preparation of pharmaceuticals due to the benign character of the biocatalyst components. To choose the catalyst with the best catalytic performance, the amounts of CS, TPP, NHS, EDC, and GOx were varied. The optimal biocatalyst allowed for 100% relative catalytic activity. The immobilization of GOx and the magnetic character of the support prevents GOx and biocatalyst loss and allows for repeated use.

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Comparative study of uncoated and tetraethylorthosilicate-coated magnetic chitosan beads in the adsorption of two textile dyes

Cited by 2 publications

References 44 publications

Hydrogels Based on Chitosan and Nanoparticles and Their Suitability for Dyes Adsorption from Aqueous Media: Assessment of the Last-Decade Progresses

Hydrogels Based on Chitosan and Nanoparticles and Their Suitability for Dyes Adsorption from Aqueous Media: Assessment of the Last-Decade Progresses

Magnetic Nanoparticle Support with an Ultra-Thin Chitosan Layer Preserves the Catalytic Activity of the Immobilized Glucose Oxidase

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