Some aspects of applying nanostructured materials in air filtration, water filtration and electrical engineering

Kimmer, Dušan; Vincent, Ivo; Lovecká, Lenka; Kazda, Tomáš; Giurg, Adam; Skorvan, Ondrej

doi:10.1063/1.4983003

Cited by 6 publications

(4 citation statements)

References 7 publications

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“…The large aspect ratio of nanofibers gives significant rise to the filtration efficiency since the pore size is reduced; moreover, the large surface area allows greater contact between the solution and filtration-sorption adsorbent [41]. The apparatus requires an applied voltage between the cathode and anode to allow the electrostatic forces to overcome the tension on the surface of the polymer, thereby ejecting the polymeric solution and solidifying non-woven nanofibers on a collecting electrode covered in a textile substrate [39,[42][43][44][45]. The quality of nanofibers can be improved by utilizing binary polymers with additives such as acetone and polyethylene oxide to obtain beadless nanostructures [41].…”

Section: Introductionmentioning

confidence: 99%

“…Research focuses on these nanostructured polymers with high sorption activity for estrogenic hormones (E1, E2, EE2 and E3). A membrane of this type could be employed for the microfiltration of wastewater compared to commercially available microfiltration membranes that exhibit greater flux [45]. The objective is simultaneous adsorption of four estrogenic hormones in a one-step process from wastewater at neutral pH because the pH of rivers is in the range of 6-9.…”

Section: Introductionmentioning

confidence: 99%

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The adsorption, kinetics, and interaction mechanisms of various types of estrogen on electrospun polymeric nanofiber membranes

et al. 2021

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This study focuses on the adsorption kinetics of four highly potent sex hormones (estrone (E1), 17β-estradiol (E2), 17α-ethinylestradiol (EE2), and estriol (E3)), present in water reservoirs, which are considered a major cause of fish feminization, low sperm count in males, breast and ovarian cancer in females induced by hormonal imbalance. Herein, electrospun polymeric nanostructures were produced from cellulose acetate, polyamide, polyethersulfone, polyurethanes (918 and elastollan), and polyacrylonitrile (PAN) to simultaneously adsorbing these estrogenic hormones in a single step process and to compare their performance. These nanofibers possessed an average fiber diameter in the range 174–330 nm and their specific surface area ranged between 10.2 and 20.9 m2 g−1. The adsorption–desorption process was investigated in four cycles to determine the effective reusability of the adsorption systems. A one-step high-performance liquid chromatography technique was developed to detect and quantify concurrently each hormone present in the solution. Experimental data were obtained to determine the adsorption kinetics by applying pseudo-first-order, pseudo-second-order and intraparticle diffusion models. Findings showed that E1, E2 and EE2 best fitted pseudo-second-order kinetics, while E3 followed pseudo-first-order kinetics. It was found that polyurethane Elastollan nanofibers had maximum adsorption capacities of 0.801, 0.590, 0.736 and 0.382 mg g−1 for E1, E2, EE2 and E3, respectively. In addition, the results revealed that polyurethane Elastollan nanofibers had the highest percentage efficiency of estrogens removal at ∼58.9% due to its strong hydrogen bonding with estrogenic hormones, while the least removal efficiency for PAN at ∼35.1%. Consecutive adsorption–desorption cycles demonstrated that polyurethane maintained the best efficiency, even after being repeatedly used four times compared to the other polymers. Overall, the findings indicate that all the studied nanostructures have the potential to be effective adsorbents for concurrently eradicating such estrogens from the environment.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The adsorption, kinetics, and interaction mechanisms of various types of estrogen on electrospun polymeric nanofiber membranes

et al. 2021

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“…We have concentrated on applying nanostructured membrane with high sorption activity for EH removal from wastewater. Such a membrane can be used as a substitute for microfiltration, compared to the commercial microfiltration membranes available in the market that exhibit higher fluxes (Kimmer et al 2017). The objective is simultaneous adsorption of various estrogenic hormones in a one-step process from wastewater.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Estrogenic Hormones in Aqueous Solution Using Electrospun Nanofibers From Waste Cigarette Butts: Kinetics, Mechanism, and Reusability

Yasir

Šopík

Patwa

et al. 2021

Preprint

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This study emphasizes rapid and simultaneous adsorptive removal of estrogenic hormones (EHs): estrone (E1), 17β-estradiol (E2), 17α-ethinylestradiol (EE2), and estriol (E3) from wastewater using recycled waste cigarette electrospun nanofibers (WCENFs). The nanofibers exhibited a small diameter (196±65 nm) and large surface area (18.05 m 2 /g), along with a strong affinity towards all EHs by adsorption due to abundant hydrogen bonding interactions. A one-step high-performance liquid chromatography technique was developed to detect each EH present in the solution simultaneously. The adsorption kinetics helps select optimum conditions for the large-scale removal process, so experimental data using pseudo-first-order, pseudo-second-order, intra-particle diffusion, Elovich, and fractional power models were fitted. It was found that E1, E2, and EE2 followed pseudo-second-order kinetics while E3 followed pseudo-first-order kinetic models. The total adsorption capacity on WCENFs was determined to be 2.14 mg/g, whereas the individual adsorption capacities of E1, E2, EE2, and E3 were found to be 0.551, 0.532, 0.687, and 0.369 mg/g, respectively. The percentage efficiency of WCENFs was highest with EE2 ~64.3% and least with E3 ~34.6%. Adsorption-desorption studies revealed that WCENFs could repeatedly be used four times. The reported results indicate a significant potential of WCENFs to be an effective sorbent and portable filter for simultaneous estrogenic hormone removal. WCENFs filter is a suitable alternative to commercial Cellulose acetate filters.

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“…However, in the case of the presented study, the strategy of arsenic capture on the nanostructured membrane was somewhat different. The polymer nanofibrous membrane capable of adsorbing arsenic from contaminated water has been prepared by electrospinning process [42,43]. The tests were further continued by combining a nanostructured microfiltration membrane, which introduces the advantage of a large surface area, with the inorganic adsorption material FeO(OH), which is considered to be an excellent selective arsenic sorbent.…”

Section: Introductionmentioning

confidence: 99%

Investigation of arsenic removal from aqueous solution through selective sorption and nanofiber-based filters

Bergerová

Kimmer

Kovářová

et al. 2021

J Environ Health Sci Engineer

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Background: This research paper focuses on removing of arsenic from contaminated water via a nanofibrous polymeric microfiltration membrane, applied in prospective combination with an inorganic sorbent based on iron oxide hydroxide FeO(OH). Materials and methods:Nanofibrous materials were prepared by electrospinning from polyurethane selected by an adsorption test. The chemical composition (FTIR), morphology (SEM, porometry) and hydrophilicity (contact angle) of the prepared nanostructured material were characterized. The process of eliminating arsenic from the contaminated water was monitored by atomic absorption spectroscopy (AAS). The adsorption efficiency of the nanofibrous material and the combination with FeO(OH) was determined, the level of arsenic anchorage on the adsorption filter was assessed by a rinsing test and the selectivity of adsorption in arsenic contaminated mineral water was examined.Results: It was confirmed that the hydrophilic aromatic polyurethane of ester type PU918 is capable of capturing arsenic by complexation on nitrogen in its polymer chains. The maximum As removal efficiency was around 62%. Arsenic was tightly anchored to the polymeric adsorbent. The adsorption process was sufficiently selective. Furthermore, it was found that the addition of even a small amount of FeO(OH) (0.5 g) to the nanofiber filter would increase the efficiency of As removal by 30%. Conclusions:The presented results showed that an adsorption filter based on a polyurethane nanostructured membrane added with an inorganic adsorbent FeO(OH) is a suitable way for the elimination of arsenic from water. However, it is necessary to ensure perfect contact between the surface of the nanostructure and the filtered medium.

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Some aspects of applying nanostructured materials in air filtration, water filtration and electrical engineering

Cited by 6 publications

References 7 publications

The adsorption, kinetics, and interaction mechanisms of various types of estrogen on electrospun polymeric nanofiber membranes

The adsorption, kinetics, and interaction mechanisms of various types of estrogen on electrospun polymeric nanofiber membranes

Adsorption of Estrogenic Hormones in Aqueous Solution Using Electrospun Nanofibers From Waste Cigarette Butts: Kinetics, Mechanism, and Reusability

Investigation of arsenic removal from aqueous solution through selective sorption and nanofiber-based filters

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