Calixarene-Composited Host–Guest Membranes Applied for Heavy Metal Ion Adsorbents

Nakajima, Lisa; Yusof, N. N. M.; Kobayashi, Taishi

doi:10.1007/s13369-015-1796-5

Cited by 10 publications

(9 citation statements)

References 20 publications

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“…Zeolites were seen as promising materials [101] for 137 Cs + adsorption [102,103] and were subsequently combined with fibrous polymer adsorbents to enhance their 137 Cs + extraction capacity. These zeolite-polymer composite fibers were initially studied for heavy metal ion removal such as Pb 2+ , Cu 2+ , Ni 2+ , and Cd 2+ [104,105]. One advantage is that the surface to volume ratio could be tuned through the zeolite fibrous polymer ratio with a specific surface value of 145 m 2 /g.…”

Section: Discussionmentioning

confidence: 99%

Towards the Extraction of Radioactive Cesium-137 from Water via Graphene/CNT and Nanostructured Prussian Blue Hybrid Nanocomposites: A Review

Rauwel

2019

Nanomaterials

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Cesium is a radioactive fission product generated in nuclear power plants and is disposed of as liquid waste. The recent catastrophe at the Fukushima Daiichi nuclear plant in Japan has increased the 137Cs and 134Cs concentrations in air, soil and water to lethal levels. 137Cs has a half-life of 30.4 years, while the half-life of 134Cs is around two years, therefore the formers’ detrimental effects linger for a longer period. In addition, cesium is easily transported through water bodies making water contamination an urgent issue to address. Presently, efficient water remediation methods towards the extraction of 137Cs are being studied. Prussian blue (PB) and its analogs have shown very high efficiencies in the capture of 137Cs+ ions. In addition, combining them with magnetic nanoparticles such as Fe3O4 allows their recovery via magnetic extraction once exhausted. Graphene and carbon nanotubes (CNT) are the new generation carbon allotropes that possess high specific surface areas. Moreover, the possibility to functionalize them with organic or inorganic materials opens new avenues in water treatment. The combination of PB-CNT/Graphene has shown enhanced 137Cs+ extraction and their possible applications as membranes can be envisaged. This review will survey these nanocomposites, their efficiency in 137Cs+ extraction, their possible toxicity, and prospects in large-scale water remediation and succinctly survey other new developments in 137Cs+ extraction.

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Section: Discussionmentioning

confidence: 99%

Towards the Extraction of Radioactive Cesium-137 from Water via Graphene/CNT and Nanostructured Prussian Blue Hybrid Nanocomposites: A Review

Rauwel

2019

Nanomaterials

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“…According to our previous procedures (Kobayashi et al, 2016; Nakajima et al, 2015), with some modifications, the wet‐spinning process for fabricating fibers was performed using PES‐NMP solutions with suspended limonite powder, as shown in Figure 1a. In the modification, to change the porosity of the composite fiber that encapsulates the limonite powder, the composite solution was prepared by varying the amount of PES and solvent NMP while keeping the amount of limonite constant.…”

Section: Methodsmentioning

confidence: 99%

Arsenic removal adsorbent using limonite–polyethersulfone composite fiber via continuous flow column process

Le Thi,

Zhe,

Kobayashi

2024

Water Environment Research

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This research introduces an enhanced limonite‐based composite fiber adsorbent for arsenic (As) removal. The modification involves creating polyethersulfone (PES)–limonite composite fibers loaded with 60 wt% limonite powders, designed to be applicable in water flow environments. The fibers were prepared using a wet‐spinning process based on phase inversion, with varying concentrations (10, 20, and 30 wt%) of PES in NMP solution. The composite fiber with 10 wt% NMP exhibited a porous structure and demonstrated efficient absorption of both As(III) and As(V). Adsorption followed the Langmuir model, with qm values of 1.5 mg/g for As(III) and 3.2 mg/g for As(V) at pH 6. In column experiments, As removal rates increased with contact time, attributed to decreased flow rates (1 mL/min). Moreover, increasing fiber column height led to enhanced removal rates, as indicated by the Adams–Bohart model. The mechanism for As(V) removal involved the formation of an inner‐sphere complex through ion exchange between α‐FeOOH and HAsO4− and H2AsO42− in an aqueous solution at pH 6.8.Practitioner Points Changing the polyethersulfone ratio in the composite leads to variations in the appearance of limonite within each composite fiber. Limonite composite fibers effectively remove As(III) and As(V) at neutral pH. The adsorption behavior follows Langmuir kinetic model, the qm of 1.5 mg/g for As(III) and 3.2 mg/g for As(V). Longer columns and contact times enhance arsenic (As) removal in practical water treatment systems. Adam–Bohart model aids in predicting breakthrough and saturation time in As adsorption column design.

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“…In our previous procedures, , the wet spinning process for fabricating fibers was performed for PES–NMP solutions with suspended limonite powders. When PES solution containing limonite powder was mixed with PES, the viscous solution was applied for wet spinning by squeezing out into the water medium placed at the bottom under pressure and forming fibers in the water medium at room temperature. ,, Here, PES was dissolved in NMP at 10, 20, and 30 wt % concentrations, and then, 60 wt % limonite powder against the weight amounts of the PES was added to the NMP solution. Then, the mixed solution was extruded through a cylindrical needle with a 0.8 cm diameter and placed in a 200 mL volume metal cylinder with a cylindrical needle of 0.8 cm diameter at the bottom in the 10 L water tank prepared below the needle.…”

Section: Methodsmentioning

confidence: 99%

Suppression of Hydrogen Sulfide Generation via the Coexistence of Anaerobic Sludge and Goethite-Rich Limonite/Polyethersulfone Composite Fibers

Le Thi,

Wakasugi,

Kobayashi

2023

ACS Omega

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Limonite−polyethersulfone (PES) composite fibers were prepared by the wet spinning method to suppress hydrogen sulfide (H 2 S) generation from anaerobic microbial sludge. The H 2 S adsorption of the prepared limonite composite fibers followed the Langmuir type, with a maximum adsorption capacity of 3.7−4.4 g H 2 S/g, indicating mesopore adsorption. The in vitro H 2 S fermentation environment with anaerobic microbial sludge with the coexistence of limonite composite fibers exhibited suppression of H 2 S generation. The coexistence of limonite composite fibers also suppressed the amount of CO generation produced by microbial fermentation, so the fibers also affected the metabolism of anaerobic microorganisms. During the anaerobic digestion process, particularly at 672−840 h (28−35 days), the mesopores of limonite in the composite fibers disappeared and changed to macropore adsorption, and the reaction of limonite with hydrogen sulfide produced pyrite (FeS 2 ) and iron sulfate (Fe 2 (SO 4 ) 3 ) as products, which remained in the fiber with conversion efficiencies of 6.8 and 32.4%, respectively. The in vitro hydrogen disulfide action of limonite composite fibers was found to be able to suppress the generated environment of about 300 ppm to about 0.4 ppm.

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Calixarene-Composited Host–Guest Membranes Applied for Heavy Metal Ion Adsorbents

Cited by 10 publications

References 20 publications

Towards the Extraction of Radioactive Cesium-137 from Water via Graphene/CNT and Nanostructured Prussian Blue Hybrid Nanocomposites: A Review

Towards the Extraction of Radioactive Cesium-137 from Water via Graphene/CNT and Nanostructured Prussian Blue Hybrid Nanocomposites: A Review

Arsenic removal adsorbent using limonite–polyethersulfone composite fiber via continuous flow column process

Suppression of Hydrogen Sulfide Generation via the Coexistence of Anaerobic Sludge and Goethite-Rich Limonite/Polyethersulfone Composite Fibers

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