(Maghemite/Chitosan/Polypyrrole) nanocomposites for the efficient removal of Cr (VI) from aqueous media

Reis, Edson da Silva; Gorza, Filipe D.S.; Pedro, Graciela da C.; Maciel, Bruna G.; Silva, Romário J. da; Ratkovski, Gabriela P.; Melo, Celso P. de

doi:10.1016/j.jece.2020.104893

Cited by 37 publications

(11 citation statements)

References 54 publications

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“…The co-precipitation method was applied in the syntheses of all samples, with some chemical variations, using a methodology previously reported in the literature . All the reagents were acquired from Sigma Aldrich, and no further purification was applied.…”

Section: Methodsmentioning

confidence: 99%

“…Thus, nanoscience is still considered as an important topic for research because of its relevant technological applications and also due to the fundamental questions that rise in low dimension systems. In Material Science (or Material Physics), for instance, there are several questions related to the adsorption, magnetic, and structural properties of nanoparticles (NPs) that still deserve further studies. − More precisely, magnetic iron oxide NPs, such as maghemite (γ-Fe 2 O 3 ), may present (i) a large surface area when their particle sizes are in the nanoscale regime, (ii) relatively low toxicity that allows their technological application in different environments, and (iii) suitable magnetic responses for multiple technological applications. However, one still needs to continuously fabricate new nanocomposites (nanohybrids) for specific purposes and also to investigate their physical properties that may improve their potential for technological applications.…”

Section: Introductionmentioning

confidence: 99%

“…On this treadmill, the studies of chemical interactions among γ-Fe 2 O 3 NPs and the distinct matrices to form different nanohybrids and their impacts in living beings are still relevant issues to be currently studied. In particular, γ-Fe 2 O 3 NPs, applied with success in toxic metal removal and biotechnology applications, are of great interest to the scientific community due to their outstanding physicochemical properties, for example, magnetic separation, remarkably specific surface adsorption area, and high catalytic response. − Moreover, when the γ-Fe 2 O 3 NPs are functionalized, several properties are significantly enhanced and can be tuned, such as toxic metal adsorption capacity, physicochemical selectivity, thermal and colloidal stabilities, and so on, as it has been often reported in the literature. − …”

Section: Introductionmentioning

confidence: 99%

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In Situ and after Synthesis of Magnetic Nanoarchitectures Grown onto Zeolite Type 5A/CTAB Frameworks and Their Ecotoxicological Properties

Moyano-Arocutipa

Zarria-Romero

Huertas-Chambilla

et al. 2023

Crystal Growth & Design

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Controlled-size maghemite (γ-Fe2O3) nanoparticles (NPs) were functionalized with zeolite 5A and cetyltrimethylammonium bromide (CTAB) by the co-precipitation method. The in situ and after NPs synthesis procedures were used to obtain five different nanomaterials that were broadly characterized by various physicochemical methods to ensure magnetic remediation properties. γ-Fe2O3 NPs with sizes ranging from 4.5 to 12 nm were obtained for bare NPs and also dispersed in matrices of zeolites and CTAB. Acute toxicity tests were systematically performed in the freshwater biomarker microcrustacean Daphnia magna to figure out the impact of these nanohybrids in living beings that are part of real effluents. The lethal concentrations were found to range from 103.2 mg L−1for bare γ-Fe2O3 NPs to 0.5 mg L–1 for the series of nanohybrids studied here. Morphological analysis of living beings showed some significant changes in their vital structures (heart and eye) and some malformations in some part of their eyes. This study has provided novel information on the magnetic properties of bare and functionalized iron oxide based NPs and, more relevant, their interactions and impacts on the cladoceran D. magna under controlled conditions that could be expanded to real environments after industrial water treatment.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In Situ and after Synthesis of Magnetic Nanoarchitectures Grown onto Zeolite Type 5A/CTAB Frameworks and Their Ecotoxicological Properties

Moyano-Arocutipa

Zarria-Romero

Huertas-Chambilla

et al. 2023

Crystal Growth & Design

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“…In recent years, the merits of outstanding adsorption ability, high adsorption efficiency, good environmental stability, and easy processing make polypyrrole (PPy) a rising star in the field of adsorption. [16][17][18] However, pure PPy tends to form clusters after polymerization, and its surface area is very small, inevitably leading to the poor adsorption efficiency.…”

Section: Introductionmentioning

confidence: 99%

Ultralight and Superelastic Nanofiber Aerogels with In-Situ Loaded Polypyrrole for High-Efficient Cr(VI) Adsorption

Liu

Wang

et al. 2022

J Polym Environ

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Constructing 3-D nanomaterial-based adsorbents with good mechanical properties has attracted increasing attention. This paper reports a simple strategy to prepare ultralight and superelastic 3-D aerogels as efficient adsorbents for heavy metal Cr(VI) in wastewater by in-situ loading of polypyrrole on cellulose acetate nanofibers followed by freeze-drying method. By the way, the cellulose acetate nanofibers are prepared by electrospinning. The obtained aerogel shows obvious 3-D porous and crosslinked structure, in which polypyrrole is uniformly coated on the nanofiber surface. The aerogel shows good mechanical properties with high compressive strength of 14.49 kPa, and can be processed into any desired shape. Due to the advantages of large specific surface area and high porosity, the maximum adsorption capacity of Cr(VI) in wastewater can reach up to 244.65 mg/g. The adsorption process can be described by pseudo-second-order kinetic model and Langmuir isotherm adsorption model, and the reduction-adsorption mechanism of polypyrrole on Cr(VI) is also studied. The present work proposes a high-quality nanofiber aerogel for efficiently adsorbing Cr(VI), which may also hold good potentials in the field of assembled adsorption. Keywords Electrospinning • Nanofiber aerogel • Polypyrrole • Cr(VI) adsorption • wastewater treatmentRecently, aerogels, as a size-controllable lightweight soft materials, have shown obvious development prospects in the field of adsorption. Several functional aerogels, such as silica colloidal aerogels, graphene composite aerogels, and polymer sponges, have recently been used in the field of adsorption. [26][27][28] Although traditional aerogels have the advantages of low density, high porosity, and high specific surface area, they also have inherent limitations of low strength and poor toughness. Nanofiber aerogels were developed and prepared by combining electrospinning technology. [29][30][31] On the basis of retaining the advantages of traditional aerogels, with the strength and toughness of nanofibers, nanofiber aerogels have greatly improved mechanical properties and become an excellent candidate for adsorbents. [32][33][34][35][36][37] Therefore, it is of great significance to explore an economical, environmentally friendly, and shape-designable polypyrrole composite aerogel material for Cr(VI) adsorption.In view of the above contents, the present study reports our success in constructing ultralight and superelastic 3-D nanofiber composite aerogels (PNFA) as efficient adsorbents for Cr(VI) in wastewater by in-situ polymerization of polypyrrole on cellulose acetate (CA) nanofibers followed by freeze-drying method. The obtained PNFA shows high porosity, large specific surface area and environmental stability, and its maximum adsorption capacity of Cr(VI) can reach up to 244.65 mg/g. The PNFA also exhibits good mechanical properties with high compressive strength, and can be processed into any desired shape. This work opens a new avenue for the large-scale production of assembled adsorption de...

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“…Among these well-established methods, adsorption-based methods are advisable owing to low-environmental impacts, uncomplicated performance, low cost, high-elimination efficiency, and possible sorbent regeneration. , Additionally, adsorption-based methods provide a relatively good discrimination between Cr(VI) and other metal ions, even at relatively low Cr(VI) concentrations . The currently available adsorption materials for the removal of Cr(VI) are mainly grouped into nanostructure-based composites, ,, industrial/agricultural waste-related adsorbents, covalent organic framework-based materials, , natural polymers, − and clay . Based on the consideration of reducing the environmental impact and production cost, amyloid fibril-related adsorbents have been recently shown to possess an exceptional removal capacity for heavy-metal ions, organic dyes, and monoatomic anions. − …”

Section: Introductionmentioning

confidence: 99%

Self-Assembly of Poly(ethyleneimine)-Modified g-C₃N₄ Nanosheets with Lysozyme Fibrils for Chromium Detoxification

et al. 2021

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We disclose a straightforward approach to fabricate nanocomposites for efficient capture of Cr(VI) from an aqueous solution through the self-assembly of poly(ethyleneimine)-modified graphitic carbon nitride nanosheets (PEI-g-C3N4 NSs) and lysozyme fibrils (LFs). The as-made PEI-g-C3N4 NSs@LFs exhibited mesoporous structures with a high specific surface area of 39.6 m2 g–1, a large pore volume of 0.25 cm3 g–1, several functional groups (e.g., −N, −NH, −NH2, and −COOH), and a zero-point charge at pH 9.1. These merits allow the PEI-g-C3N4 NSs@LFs to further enhance their physical adsorption and electrostatic attraction with the negatively charged Cr(VI) species of HCrO4 – and CrO4 2–, which is beneficial for the uptake of Cr(VI), >80%, from an aqueous solution in a wide pH range. Interestingly, X-ray photoelectron spectra indicate that the PEI-g-C3N4 NSs@LFs converted Cr(VI) to Cr(III) through visible-light-induced photoreduction. The adsorption of Cr(VI) on the surface of PEI-g-C3N4 NSs@LFs was found to obey the Freundlich isotherm model, signifying that they have a heterogeneous surface for the multilayer uptake of Cr(VI). In contrast, the PEI-g-C3N4 NSs and LFs as Cr(VI) adsorbents followed the Langmuir isotherm model. Adsorption kinetic studies showed that the uptake of Cr(VI) through the PEI-g-C3N4 NSs@LFs was highly correlated with a pseudo-first-order model, suggesting that physisorption dominates the interaction of Cr(VI) and the PEI-g-C3N4 NSs@LFs. In real-life applications, the PEI-g-C3N4 NSs@LFs were used for the detoxification of the total chromium in the industrial effluent and sludge samples.

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(Maghemite/Chitosan/Polypyrrole) nanocomposites for the efficient removal of Cr (VI) from aqueous media

Cited by 37 publications

References 54 publications

In Situ and after Synthesis of Magnetic Nanoarchitectures Grown onto Zeolite Type 5A/CTAB Frameworks and Their Ecotoxicological Properties

In Situ and after Synthesis of Magnetic Nanoarchitectures Grown onto Zeolite Type 5A/CTAB Frameworks and Their Ecotoxicological Properties

Ultralight and Superelastic Nanofiber Aerogels with In-Situ Loaded Polypyrrole for High-Efficient Cr(VI) Adsorption

Self-Assembly of Poly(ethyleneimine)-Modified g-C₃N₄ Nanosheets with Lysozyme Fibrils for Chromium Detoxification

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(Maghemite/Chitosan/Polypyrrole) nanocomposites for the efficient removal of Cr (VI) from aqueous media

Cited by 37 publications

References 54 publications

In Situ and after Synthesis of Magnetic Nanoarchitectures Grown onto Zeolite Type 5A/CTAB Frameworks and Their Ecotoxicological Properties

In Situ and after Synthesis of Magnetic Nanoarchitectures Grown onto Zeolite Type 5A/CTAB Frameworks and Their Ecotoxicological Properties

Ultralight and Superelastic Nanofiber Aerogels with In-Situ Loaded Polypyrrole for High-Efficient Cr(VI) Adsorption

Self-Assembly of Poly(ethyleneimine)-Modified g-C3N4 Nanosheets with Lysozyme Fibrils for Chromium Detoxification

Contact Info

Product

Resources

About

Self-Assembly of Poly(ethyleneimine)-Modified g-C₃N₄ Nanosheets with Lysozyme Fibrils for Chromium Detoxification