Macroporous Cryogel-Based Systems for Water Treatment Applications and Safety: Nanocomposite-Based Cryogels and Bacteria-Based Bioreactors

Otero-González, Lila; Berillo, Dmitriy

doi:10.1007/978-981-19-7834-0_1

Cited by 5 publications

(5 citation statements)

References 113 publications

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“…As an alternative to the Freundlich model, the Langmuir isotherm describes a simpler adsorption mechanism. The following assumptions are made in the Langmuir model [31]:…”

Section: Langmuir Isothermmentioning

confidence: 99%

“…The CHI-GA-2 cryogels obtained in a conventional freezer at −22 °C and without freezing control were studied. It is known that the moment of freezing is quite crucial for the microstructure of a material [31,38,56] due to the condensation re-…”

Section: Effect Of Flow Rate On Adsorption Efficiencymentioning

confidence: 99%

“…The CHI-GA-2 cryogels obtained in a conventional freezer at −22 • C and without freezing control were studied. It is known that the moment of freezing is quite crucial for the microstructure of a material [31,38,56] due to the condensation reaction taking place; at some point, a frozen hydrogel may be formed, resulting in the formation of closed pores, which in turn results in decreases in adsorption capacity and filtration efficiency. The cryogel obtained in freezer was characterized by a significantly higher water permeability rate (10 mL/min) compared to CHI-GA-1.…”

Section: Effect Of Flow Rate On Adsorption Efficiencymentioning

confidence: 99%

“…In spite of the great attention to the application of nanocomposite devices for water and wastewater treatment, their safety assessment is frequently overlooked. In order to transfer these research advances closer to real applications, the following issues should be addressed: more data are required on the acute and chronic toxicity of NPs; more reliable protocols for toxicity estimation of NP devices should be developed and validated; different conditions of the NP operation should be considered during risk assessment, including end of life [31]. The use of dynamic membranes for particle removal from water has some drawbacks, such as blocking of pores, an increase in back pressure following overexploitation, and the necessity of recycling.…”

Section: Introductionmentioning

confidence: 99%

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Chitosan Glutaraldegyde Cryogels for Wastewater Treatment and Extraction of Silver Nanoparticles

Berillo,

Arysbek

2023

Processes

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The discharge of nanoparticles into the environment, such as through industrial plants and municipal wastewater treatment plants, can pose a hazard to aquatic life. This study demonstrates the effective removal of silver nanoparticles (AgNPs) using a chitosan-based cryogel, which has potential applications in agriculture, as well as in water treatment or in industrial plants that discharge into environmentally sensitive water bodies. The adsorbent is economically viable, has high affinity toward metal nanoparticles, is biodegradable and biocompatible, and displays a good removal of nanoparticles. AgNP adsorption was monitored using UV/Vis spectroscopy and TEM analysis. SEM, nitrogen adsorption, TGA, and FTIR analysis were used for cryogel characterization. The BET model of nitrogen adsorption revealed a specific surface area of 7.7 m2/g for chitosan–glutaraldehyde (CHI–GA) cryogels. The elasticity modulus of the CHI–GA cryogel was estimated as 543 ± 54 kPa. The AgNPs were characterized by a negative charge (−38 ± 17 mV) and an average diameter of 64 nm with a polydispersity index of 0.16. The mechanism of AgNP adsorption involved electrostatic interactions between the oppositely charged surfaces of the cryogel and particles. The temperature of the cryogel preparation affected the water permeability and adsorption efficiency. CHI–GA illustrated a capacity of 63 mg/g at a flow rate of 0.8 mL/min under a solution pressure of 500–970 Pa. The increase in pressure of the model plant extract-stabilized AgNP suspension (14 mg/L AgNPs) to 3.42–3.9 kPa led to an increase in the water permeability rate to 10 mL/min and a significant decrease in the efficiency of particle removal. The CHI–GA adsorbent demonstrated up to 96.5% AgNP removal until the breakthrough point due to adsorbent saturation. The CHI–GA cryogel adsorbent (1 g) can be used for efficient filtering of about 4.5 L of contaminated water.

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“…As an alternative to the Freundlich model, the Langmuir isotherm describes a simpler adsorption mechanism. The following assumptions are made in the Langmuir model [31]:…”

Section: Langmuir Isothermmentioning

confidence: 99%

Section: Effect Of Flow Rate On Adsorption Efficiencymentioning

confidence: 99%

Section: Effect Of Flow Rate On Adsorption Efficiencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Chitosan Glutaraldegyde Cryogels for Wastewater Treatment and Extraction of Silver Nanoparticles

Berillo,

Arysbek

2023

Processes

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“…Cryogels with immobilized NPs are an example of an innovative solution for water purification; they remove not only inorganic pollutants such as heavy metals, but also organic ones such as dyes. These nanocomposites exhibit not only adsorption, but also catalytic mechanisms of action [19].…”

Section: Introductionmentioning

confidence: 99%

Nanoremediation and Antioxidant Potential of Biogenic Silver Nanoparticles Synthesized Using Leucena’s Leaves, Stem, and Fruits

Silva,

Tonelli,

Delgado

et al. 2024

IJMS

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Synthetic dyes are persistent organic environmental pollutants that can cause extensive damage to living beings and to the ecosystem as a whole. Cost-effective, sustainable, and efficient strategies to deal with this type of pollution are necessary as it commonly resists conventional water treatment methods. Silver nanoparticles (AgNPs) synthesized using the aqueous extract from the leaves, stem, and fruits of Leucaena leucocephala (Leucena) were produced and characterized through UV–vis, TEM, EDS, SDL, XPS, XRD, and zeta potential, and they proved to be able to promote adsorption to remediate methylene blue and tartrazine pollution in water. The nanoremediation was performed and did not require direct exposure to sunlight or any special lamp or a specific reduction agent. The AgNPs produced using the extract from the leaves exhibited the best performance in nanoremediation and also presented antioxidant activity that surpassed the one from butylated hydroxytoluene (BHT). Consequently, it is an interesting nanotool to use in dye nanoremediation and/or as an antioxidant nanostructure.

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Nanoremediation of tilapia fish culture using iron oxide nanoparticles biosynthesized by Bacillus subtilis and immobilized in a free-floating macroporous cryogel

Sheta,

El-Zahed,

Nawareg

et al. 2024

BMC Vet Res

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Background and aim Contamination from increased anthropogenic activities poses a threat to human health as well as the ecosystem. To develop a nanotechnological approach to improve aqua fisheries, we synthesized magnetic hematite nanoparticle-based gel and evaluated its efficacy in a cadmium-polluted closed system to decontaminate water and improve tilapia fish health. Methods Green iron oxide nanoparticles were biosynthesized by the metabolite of bacillus subtilis and incorporated into polyvinyl alcohol to construct a hydrogel by cryogelation. Key findings The cryogel had interconnected macropores with diameters widely ranging between 20 and 200 μm and could be free-floating in water. When applied in cadmium-polluted tilapia culture, this nanogel reduced turbidity and ammonia in the aquarium, adsorbed cadmium from the water with a larger quantity on the gel’s outer surface than in its center., and reduced cadmium concentration in tilapia’s liver, gills, and muscles. Application of this nano-based cryogel reduced the toxic effects of cadmium on tilapia fish. It maintained hepatic and renal cell nuclear integrity as determined by comet assay. This nano-treatment also reversed the cadmium-induced elevations of plasma lipids, glucose, stress marker cortisol, the hepatic enzymes AST and ALT, and the kidney function marker urea, and improved the lymphocytopenia and other hematological functions in tilapia fish intoxicated by cadmium.

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Macroporous Cryogel-Based Systems for Water Treatment Applications and Safety: Nanocomposite-Based Cryogels and Bacteria-Based Bioreactors

Cited by 5 publications

References 113 publications

Chitosan Glutaraldegyde Cryogels for Wastewater Treatment and Extraction of Silver Nanoparticles

Chitosan Glutaraldegyde Cryogels for Wastewater Treatment and Extraction of Silver Nanoparticles

Nanoremediation and Antioxidant Potential of Biogenic Silver Nanoparticles Synthesized Using Leucena’s Leaves, Stem, and Fruits

Nanoremediation of tilapia fish culture using iron oxide nanoparticles biosynthesized by Bacillus subtilis and immobilized in a free-floating macroporous cryogel

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