Coatings of magnetic composites of iron oxide and carbon nitride for photocatalytic water purification

Köwitsch, Isabel; Mehring, M.

doi:10.1039/d1ra00790d

Cited by 4 publications

(4 citation statements)

References 56 publications

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“…Composites of magnetic nanoparticles randomly dispersed in a polymer matrix are promising materials widely applied in many engineering areas for magnetic separation, catalysis, MRI contrast agents, or electromagnetic shielding [1][2][3][4][5]. Polydimethylsiloxane (PDMS) is a suitable polymer for embedded composite materials that combine the properties of the matrix and the nanoparticles [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Influences of Dispersions’ Shapes and Processing in Magnetic Field on Thermal Conductibility of PDMS–Fe3O4 Composites

et al. 2021

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Composites of magnetite (Fe3O4) nanoparticles dispersed in a polydimethylsiloxane (PDMS) matrix were prepared by a molding process. Two types of samples were obtained by free polymerization with randomly dispersed particles and by polymerization in an applied magnetic field. The magnetite nanoparticles were obtained from magnetic micrograins of acicular goethite (α-FeOOH) and spherical hematite (α-Fe2O3), as demonstrated by XRD measurements. The evaluation of morphological and compositional properties of the PDMS:Fe3O4 composites, performed by SEM and EDX, showed that the magnetic particles were uniformly distributed in the polymer matrix. Addition of magnetic dispersions promotes an increase of thermal conductivity compared with pristine PDMS, while further orienting the powders in a magnetic field during the polymerization process induces a decrease of the thermal conductivity compared with the un-oriented samples. The shape of the magnetic dispersions is an important factor, acicular dispersions providing a higher value for thermal conductivity compared with classic commercial powders with almost spherical shapes.

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Section: Introductionmentioning

confidence: 99%

Influences of Dispersions’ Shapes and Processing in Magnetic Field on Thermal Conductibility of PDMS–Fe3O4 Composites

et al. 2021

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“…The obtained yellow powder is grinded in a mortar and sieved to a particle size smaller than 100 μm. Detailed information on synthesis and characterization of the CN photocatalyst materials was reported in reference [50]. To obtain β-Bi 2 O 3 , the [Bi 38 O 45 (OMc) 24 (EtOH) 13 ] cluster was synthesized according to reference [47] and hydrolyzed to obtain pure β-Bi 2 O 3 according to [26,51].…”

Section: Methodsmentioning

confidence: 99%

“…The as-prepared fleeces are used as substrates for the photocatalyst material. The preparation process, the characterization (SI 1; UV-vis spectra, PXRD, photoluminescence spectra, SEM) and the evaluation of the photocatalytic activity of the used CN [50] and β-Bi 2 O 3 [26,51] particles is described in the literature. To coat the fleeces with these catalyst materials, the electrospun fleeces are dipped into a solution of ethanol (EtOH) and water, which causes the polymer to swell.…”

Section: Coating Of Pvac Fleeces With Cn and β-Bi 2 Omentioning

confidence: 99%

Photocatalytic water purification under visible light using carbon nitride materials and β-Bi2O3 immobilized on electrospun polyvinyl acetate fibers

Köwitsch¹,

Schäfer²,

Hornig³

et al. 2022

SN Appl. Sci.

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We report on the immobilization of carbon nitride (CN) materials and β-Bi2O3 on electrospun polyvinyl acetate (PVAc) fiber substrates using a dispersion based dip coating process. The spinning process was optimized by variation of several parameters to finally obtain continuous droplet-free fibers at 15 kV and a flow rate of 50 µL min−1 using a needle with 1.2 mm diameter. The polymer substrates were coated with the β-Bi2O3 and CN materials, which were characterized using SEM and applied in the photocatalytic degradation of organic pollutants such as Rhodamine B (RhB), ethinyl estradiol (EE2) and triclosan using visible light irradiation. The pollutants were degraded with up to 50% of the initial concentration within 8 h. Different amounts of CN material were deposited to evaluate the photocatalytic activity per mass. Immobilized CN materials were shown to be of higher activity (2.0 × 10−10 mol mg−1 min−1) than β-Bi2O3 (1.3 × 10−10 mol mg−1 min−1) and the mixture CN/β-Bi2O3 (1.6 × 10−10 mol mg−1 min−1). Reference samples with CN particles partially embedded in the polymer fleece showed minor degradaton rates (18% RhB degradation within 8 h) as compared to coated fiber substrates (47% RhB degradation within 8 h). Minor leaching of the carbon nitride material and no leaching of β-Bi2O3 occurs as shown by NPOC (non purgeable organic carbon) and ICP-MS measurements.

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“…A Fe 2 O 3 -TiO 2 /PVP composite layer was prepared by spray coating a mixture of the commercial oxides and polyvinylpyrrolidone on a glass pipe and tested in triclosan degra-dation under solar light in deionized water and simulated greywater effluent [139]. The authors found this immobilization procedure effective, leading to a removal up to 83%, and proposed a decomposition pathway based on the intermediates detected by LC-MS. A similar spray coating technique was used for the deposition of magnetic composites of iron oxide (α-Fe 2 O 3 and Fe 3 O 4 ) and carbon nitride (C 3 N 4 ) synthesized via a microwave-assisted hydrothermal route [140]. Such catalyst showed interesting results in the degradation of triclosan and ethinylestradiol under visible-light irradiation, particularly a TCS was degraded with up to 46% of the initial concentration within 8 h, under visible-light irradiation.…”

Section: Triclosanmentioning

confidence: 99%

Recent Advances in Endocrine Disrupting Compounds Degradation through Metal Oxide-Based Nanomaterials

et al. 2022

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Endocrine Disrupting Compounds (EDCs) comprise a class of natural or synthetic molecules and groups of substances which are considered as emerging contaminants due to their toxicity and danger for the ecosystems, including human health. Nowadays, the presence of EDCs in water and wastewater has become a global problem, which is challenging the scientific community to address the development and application of effective strategies for their removal from the environment. Particularly, catalytic and photocatalytic degradation processes employing nanostructured materials based on metal oxides, mainly acting through the generation of reactive oxygen species, are widely explored to eradicate EDCs from water. In this review, we report the recent advances described by the major publications in recent years and focused on the degradation processes of several classes of EDCs, such as plastic components and additives, agricultural chemicals, pharmaceuticals, and personal care products, which were realized by using novel metal oxide-based nanomaterials. A variety of doped, hybrid, composite and heterostructured semiconductors were reported, whose performances are influenced by their chemical, structural as well as morphological features. Along with photocatalysis, alternative heterogeneous advanced oxidation processes are in development, and their combination may be a promising way toward industrial scale application.

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Coatings of magnetic composites of iron oxide and carbon nitride for photocatalytic water purification

Abstract: Photocatalytic degradation of organic pollutants with spray coated iron oxide/CN composite films.

Cited by 4 publications

References 56 publications

Influences of Dispersions’ Shapes and Processing in Magnetic Field on Thermal Conductibility of PDMS–Fe3O4 Composites

Influences of Dispersions’ Shapes and Processing in Magnetic Field on Thermal Conductibility of PDMS–Fe3O4 Composites

Photocatalytic water purification under visible light using carbon nitride materials and β-Bi2O3 immobilized on electrospun polyvinyl acetate fibers

Recent Advances in Endocrine Disrupting Compounds Degradation through Metal Oxide-Based Nanomaterials

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