Chitosan-sodium alginate multilayer membrane developed by Fe0@WO3 nanoparticles: Photocatalytic removal of hexavalent chromium

Kazemi, Maryamossadat; Jahanshahi, Mohsen; Peyravi, Majid

doi:10.1016/j.carbpol.2018.06.069

Cited by 50 publications

(13 citation statements)

References 55 publications

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“…The protonation of polymer molecules, at lower pH values, can reduce the amount of available sites for metal ion binding. Furthermore, amino groups’ protonation generates electrostatic repulsions on metallic cations, henceforth decreasing accessible sites for ion adsorption [ 57 ]. The Cr(VI) adsorption increased with pH increment, up to pH = 5, because more active adsorption sites on polymer nanocomposites were deprotonated and had more net attraction forces that enabled higher Cr adsorption from solution.…”

Section: Resultsmentioning

confidence: 99%

“…Although Fe-NPs surface modifications could prevent their oxidation, especially when barriers between target pollutants and Fe-NPs are created which may influence Fe-NPs ability and reactivity for pollutant’ removal, the employment of modified coating materials with high reactivity for HM removal can increase the removal potentialities of their composites [ 53 ]. The oxidation/reduction potential of Cr 6+ ions was illustrated to increase with pH decline; Cr 6+ ions became more susceptible to reduction in acidic solutions [ 57 ]. As Cht and Alg were evidenced as excellent HM adsorption material, they exhibited good affinities for Cr 6+ removal, either as plain composite, or after as active coating for adsorbing NPs [ 25 , 54 ].…”

Section: Resultsmentioning

confidence: 99%

“…The initial prompt Cr uptake indicated high affinities between the adsorbate and the adsorbent nanocomposites, which are accredited to the adsorbents’ biochemical characteristics. The extra addition of the adsorbents beyond 4 g/L did not trigger significant adsorption increment, which is assumed to be attributed to adsorbent particles overcrowding [ 24 , 57 ]. At the lower concentrations, adsorbent nanocomposites had sufficient surface area, adsorption sites, and amount of Fe-NPs for Cr 6+ uptake [ 58 ], whereas at higher adsorbent doses, the adsorption sites of nanopolymers composites are overlapping and their particles are overcrowding, which are suggested to decrease ions adsorption [ 25 , 53 ].…”

Section: Resultsmentioning

confidence: 99%

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Application of Chitosan/Alginate Nanocomposite Incorporated with Phycosynthesized Iron Nanoparticles for Efficient Remediation of Chromium

et al. 2021

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Biopolymers and nanomaterials are ideal candidates for environmental remediation and heavy metal removal. As hexavalent chromium (Cr6+) is a hazardous toxic pollutant of water, this study innovatively aimed to synthesize nanopolymer composites and load them with phycosynthesized Fe nanoparticles for the full Cr6+ removal from aqueous solutions. The extraction of chitosan (Cht) from prawn shells and alginate (Alg) from brown seaweed (Sargassum linifolium) was achieved with standard characteristics. The tow biopolymers were combined and cross-linked (via microemulsion protocol) to generate nanoparticles from their composites (Cht/Alg NPs), which had a mean diameter of 311.2 nm and were negatively charged (−23.2 mV). The phycosynthesis of iron nanoparticles (Fe-NPs) was additionally attained using S. linifolium extract (SE), and the Fe-NPs had semispherical shapes with a 21.4 nm mean diameter. The conjugation of Cht/Alg NPs with SE-phycosynthesized Fe-NPs resulted in homogenous distribution and stabilization of metal NPs within the polymer nanocomposites. Both nanocomposites exhibited high efficiency as adsorbents for Cr6+ at diverse conditions (e.g., pH, adsorbent dose, contact time and initial ion concentration) using batch adsorption evaluation; the most effectual conditions for adsorption were a pH value of 5.0, adsorbent dose of 4 g/L, contact time of 210 min and initial Cr6+ concentration of 75 ppm. These factors could result in full removal of Cr6+ from batch experiments. The composited nanopolymers (Cht/Alg NPs) incorporated with SE-phycosynthesized Fe-NPs are strongly recommended for complete removal of Cr6+ from aqueous environments.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Application of Chitosan/Alginate Nanocomposite Incorporated with Phycosynthesized Iron Nanoparticles for Efficient Remediation of Chromium

et al. 2021

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“…Photocatalytic technology is one of the most important techniques used in the removal of toxic environmental pollutants from industrial effluents. Various photocatalytically active materials such as ZnO, TiO 2 , and tungsten trioxide are used in this process for effluent treatment [68]. Abdelwahab [68] have studied the photocatalytic elimination of toxic chromium heavy metal ion using the tungsten oxide nanomaterials reinforced with iron and chitosan polyethersulphone layers.…”

Section: Photocatalytic Technologymentioning

confidence: 99%

“…Various photocatalytically active materials such as ZnO, TiO 2 , and tungsten trioxide are used in this process for effluent treatment [68]. Abdelwahab [68] have studied the photocatalytic elimination of toxic chromium heavy metal ion using the tungsten oxide nanomaterials reinforced with iron and chitosan polyethersulphone layers. The ultrafiltration membrane used in this study showed enhanced removal of Cr(VI) ions from the aqueous solution under the visible light environment.…”

Section: Photocatalytic Technologymentioning

confidence: 99%

Insights of CMNPs in water pollution control

Joshiba¹,

Kumar²,

Carolin³

et al. 2019

IET nanobiotechnol.

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The various toxic contaminants such as dyes, heavy metals, pesticides, rare-earth elements, and hazardous chemicals are the major threats to all the flora and fauna. Owing to the harmful ill effects caused by the toxic contaminants, it is necessary to eliminate these compounds from the authors' ecosystem. The chitosan magnetic nanomaterials (CMNPs) are one of the superior materials used in the wastewater treatment through various conventional technologies. The chitosan is a natural source obtained from the crustacean shells of crabs, prawns etc. The magnetic nanomaterial prepared by the reinforcement of chitosan is highly effective in the removal of heavy metals, dyes, organic matter, and harmful chemicals. It is used in various technologies such as adsorption, flocculation, immobilisation, photocatalytic technology, and bioremediation. This possesses unique surface and magnetic characteristics, Moreover, it is simple, economically feasible, and eco-friendly material used efficiently in wastewater treatment. This review paper depicts the overview of CMNP in the industrial effluent treatment.

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Multifunctional all‐polymer photovoltaic blend with simultaneously improved efficiency (18.04%), stability and mechanical durability

Liu

Zhou

et al. 2022

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One of the most appealing material systems for solar energy conversion is all‐polymer blend. Presently, the three key merits (power conversion efficiency, operation stability and mechanical robustness) exhibited a trade‐off in a particular all‐polymer blend system, which greatly limit its commercial application. Diverting the classic ternary tactic of organic solar cells based on polymer, nonfullerene small molecule and fullerene, herein we demonstrate that the three merits of a benchmark all‐polymer blend PM6:PY‐IT can be simultaneously maximized via the introduction of a polymerized fullerene derivative PPCBMB. Importantly, the addition of the guest component promoted the power conversion efficiency of PM6:PY‐IT blend from 16.59% to 18.04%. Meanwhile, the device stability and film ductility are also improved due to the addition of this polymerized fullerene material. Morphology and device physics analyses reveal that optimal ternary system contains well‐maintained molecular packing and crystallinity, being beneficial to keeping favorable charge transport and the reduced domain size contributed to charge generation and ductility improvement. Furthermore, the ternary photovoltaic blend was successfully used as photocatalysts, and an excellent heavy metal removal from water was demonstrated. This study showcases the multi‐functions of all‐polymer blends via the use of polymerized fullerenes.

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Chitosan-sodium alginate multilayer membrane developed by Fe0@WO3 nanoparticles: Photocatalytic removal of hexavalent chromium

Cited by 50 publications

References 55 publications

Application of Chitosan/Alginate Nanocomposite Incorporated with Phycosynthesized Iron Nanoparticles for Efficient Remediation of Chromium

Application of Chitosan/Alginate Nanocomposite Incorporated with Phycosynthesized Iron Nanoparticles for Efficient Remediation of Chromium

Insights of CMNPs in water pollution control

Multifunctional all‐polymer photovoltaic blend with simultaneously improved efficiency (18.04%), stability and mechanical durability

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