Chitosan-based hydrogels for the sorption of metals and dyes in water: isothermal, kinetic, and thermodynamic evaluations

Vieira, Tainara; Artifon, Samantha E.S.; Cesco, Cassiele T.; Vilela, Pâmela Becalli; Becegato, Valter Antônio; Paulino, Alexandre Tadeu

doi:10.1007/s00396-020-04786-2

Cited by 31 publications

(9 citation statements)

References 53 publications

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“…During the composite fabrication, some additional steps like acid activation and organic modification of the clay minerals are needed to obtain smaller particle sizes, larger interlayer spaces, and higher hydrophobicities. One of the popular clay-activating agents is sulfuric acid, 94 whereas organoclays are conventionally prepared by combining clay with quaternary ammonium, phosphonium, or sulfonium cations. 95 In addition, throughout the past decade, organic modification has been performed widely by introducing various surfactants.…”

Section: Claymentioning

confidence: 99%

“…A chitosanactivated clay composite is also fabricated for removing organic matter, dyes, and heavy metals present in wastewater. 94 The major chemical used to convert raw clay to activated clay is mineral acid. At the beginning of the 21st century, sulfuric acid was used to activate the clay to fabricate chitosan−clay composites for multipurpose applications such as removal of humic acid, tannic acid, and dyes (methylene blue and reactive red) and immobilizing phosphatase.…”

Section: Chitosan−clay Composites Formentioning

confidence: 99%

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Chitosan–Clay Composites for Wastewater Treatment: A State-of-the-Art Review

et al. 2021

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In recent decades, increased domestic and industrial activities have led to the release of various pollutants into the aquatic environment. A robust and eco-friendly technique for removing these pollutants from wastewater is a crucial need. Among existing technologies, adsorption is considered to be a simple, cost-effective, and sustainable method. Recently, chitosan−clay nanocomposites have emerged because of their high abundance, ease of fabrication, and efficacy as adsorbents. Quantitatively, this particular class of composites is capable of removing ∼99% of dyes, metals, and harmful negative ions from various solutions. Also, the composite is designed to remove a maximum of ∼94% of the targeted herbicides from media under investigation. This review summarizes important information about this adsorbent in removing micropollutants from various water sources. A short overview of the chemical structure and the modification of chitosan and clay, along with their interaction within the composite matrix and with contaminants, is presented. Finally, a critical analysis of the removal performance of these composites compared with that of other industrial adsorbents is provided. Future research directions are suggested on the basis of the technological challenges faced in the industrial implementation of these materials.

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Section: Claymentioning

confidence: 99%

Section: Chitosan−clay Composites Formentioning

confidence: 99%

Chitosan–Clay Composites for Wastewater Treatment: A State-of-the-Art Review

et al. 2021

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“…The intensities were changed due to the water absorption on the surface of beads and the hydrogen bonds occurring in a crosslinked polymer network [25]. Other absorption bands were observed at 2913 cm −1 (symmetrical stretching vibrations of C-H groups), 1404 cm −1 (asymmetric stretching vibrations of COO − groups), 1015 cm −1 (C-H and P-O groups), 560 cm −1 (P-O groups) [26]. The band was observed at 1549 cm −1 , which was attributed to primary and secondary amide groups in the chitosan matrix [27].…”

Section: Samplementioning

confidence: 99%

“…Table 3 shows the kinetic adsorption paramete pseudo-second-order kinetic model is better fitted to describe the interaction of th to both MB and Cu(II) ions, as demonstrated by the smaller SD values. Therefore, be assumed that the chemical reactions between dye or metal ions and the HGC be the primary interaction controlling the adsorption rate and process [26,31,32]. F more, it reported that metal ions binding to active sites in the chitosan-based ads formed both monolayer and multilayer, resulting in the rate-limiting adsorption [26,32].…”

Section: Adsorption Kineticsmentioning

confidence: 99%

“…Therefore, it may be assumed that the chemical reactions between dye or metal ions and the HGC beads are the primary interaction controlling the adsorption rate and process [26,31,32]. Furthermore, it reported that metal ions binding to active sites in the chitosan-based adsorbents formed both monolayer and multilayer, resulting in the rate-limiting adsorption process [26,32].…”

Section: Adsorption Kineticsmentioning

confidence: 99%

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Highly Porous Hydroxyapatite/Graphene Oxide/Chitosan Beads as an Efficient Adsorbent for Dyes and Heavy Metal Ions Removal

et al. 2021

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Dye and heavy metal contaminants are mainly aquatic pollutants. Although many materials and methods have been developed to remove these pollutants from water, effective and cheap materials and methods are still challenging. In this study, highly porous hydroxyapatite/graphene oxide/chitosan beads (HGC) were prepared by a facile one-step method and investigated as efficient adsorbents. The prepared beads showed a high porosity and low bulk density. SEM images indicated that the hydroxyapatite (HA) nanoparticles and graphene oxide (GO) nanosheets were well dispersed on the CTS matrix. FT-IR spectra confirmed good incorporation of the three components. The adsorption behavior of the obtained beads to methylene blue (MB) and copper ions was investigated, including the effect of the contact time, pH medium, dye/metal ion initial concentration, and recycle ability. The HGC beads showed rapid adsorption, high capacity, and easy separation and reused due to the porous characteristics of GO sheets and HA nanoparticles as well as the rich negative charges of the chitosan (CTS) matrix. The maximum sorption capacities of the HGC beads were 99.00 and 256.41 mg g−1 for MB and copper ions removal, respectively.

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Soaking pretreatment of hydrogel adsorbent in distilled water to enhance efficiency of adsorption onto low concentration dye

Wang

et al. 2023

Polymer Engineering & Sci

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To address the poor removal rate of low-concentration dye adsorption, the soaking pretreatment of hydrogel adsorbent in distilled water was suggested. In contrast to the conventional method of directly adding dried particles into dye solution, the purposed procedure involved adding an adsorbent into distilled water before transferring it into the dye solution. A hydrogel adsorbent based on P(AANa/AM) containing COONa groups was fabricated as an example for the hypothesis. The maximum adsorption capacity of P(AANa/AM) hydrogel adsorbent onto MB was 2455.45 mg/g under an initial MB concentration of 1000 mg/L. After two rounds of soaking pretreatment in distilled water, the clearance rate of 20 mg/L MB increased from 97.79% to 99.40%. Considering the hydrophilicity and ionization of COONa group, a high concentration of Na + was released into solution. Hydrogel soaked multiple times in fresh distilled water induced the continuous release of Na + into distilled water, although the swelling equilibrium was already achieved in the first soak. In dye adsorption and desorption experiments, the water absorption behavior was observed. Overall, this work revealed that the soaking pretreatment of hydrogel adsorbent in distilled water can enhance the removal rate of low concentration dye through adsorption.

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Chitosan-based hydrogels for the sorption of metals and dyes in water: isothermal, kinetic, and thermodynamic evaluations

Cited by 31 publications

References 53 publications

Chitosan–Clay Composites for Wastewater Treatment: A State-of-the-Art Review

Chitosan–Clay Composites for Wastewater Treatment: A State-of-the-Art Review

Highly Porous Hydroxyapatite/Graphene Oxide/Chitosan Beads as an Efficient Adsorbent for Dyes and Heavy Metal Ions Removal

Soaking pretreatment of hydrogel adsorbent in distilled water to enhance efficiency of adsorption onto low concentration dye

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