Deposition of Sorption and Photocatalytic Material on Nanofibers and Fabric by Controlled Sublimation

Dvorský, Richard; Svoboda, Ladislav; Bednář, J.; Mančík, Pavel; Matýsek, Dalibor; Pomiklova, Marketa

doi:10.4028/www.scientific.net/msf.936.63

Cited by 3 publications

(9 citation statements)

References 4 publications

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“…Due to the fact, that the antimicrobial Ag and Zn are deposited on, respective within the macroscopic and porous silicate structure, it is easy to separate the material back from the dispersion. Moreover, according to our experience, it is feasible to deposit this material onto nanofibers or fabric [65], where it could act as an antimicrobial layer in various types of filters.…”

Section: Discussionmentioning

confidence: 99%

Antimicrobial Synergistic Effect Between Ag and Zn in Ag-ZnO·mSiO2 Silicate Composite with High Specific Surface Area

et al. 2019

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Antimicrobial materials are widely used for inhibition of microorganisms in the environment. It has been established that bacterial growth can be restrained by silver nanoparticles. Combining these with other antimicrobial agents, such as ZnO, may increase the antimicrobial activity and the use of carrier substrate makes the material easier to handle. In the paper, we present an antimicrobial nanocomposite based on silver nanoparticles nucleated in general silicate nanostructure ZnO·mSiO2. First, we prepared the silicate fine net nanostructure ZnO·mSiO2 with zinc content up to 30 wt% by precipitation of sodium water glass in zinc acetate solution. Silver nanoparticles were then formed within the material by photoreduction of AgNO3 on photoactive ZnO. This resulted into an Ag-ZnO·mSiO2 composite with silica gel-like morphology and the specific surface area of 250 m2/g. The composite, alongside with pure AgNO3 and clear ZnO·mSiO2, were successfully tested for antimicrobial activity on both gram-positive and gram-negative bacterial strains and yeast Candida albicans. With respect to the silver content, the minimal inhibition concentration of Ag-ZnO·mSiO2 was worse than AgNO3 only for gram-negative strains. Moreover, we found a positive synergistic antimicrobial effect between Ag and Zn agents. These properties create an efficient and easily applicable antimicrobial material in the form of powder.

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Section: Discussionmentioning

confidence: 99%

Antimicrobial Synergistic Effect Between Ag and Zn in Ag-ZnO·mSiO2 Silicate Composite with High Specific Surface Area

et al. 2019

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“…As a possible explanation for the observed synergy, the formation of the Schottky semiconductor-metal transition can be considered, which represents a qualitatively new factor in the coexistence of both components. In our previous work [11], the possibility of deposition of this type of material on nanofibers and fabrics for antimicrobial applications in various types of filters was also experimentally verified.…”

Section: Antimicrobial Synergistic Effect Between Ag and Zno In A Silicate Composite Ag-zno • Msio 2 With A High Specific Surface Areamentioning

confidence: 92%

“…5.24 and 5.25). [11] The semiconducting g-C 3 N 4 has a band gap of about 2.7 eV [12]. This value corresponds to the maximum wavelength of excitation photons of about 450 nm, which already belongs to the blue part of visible light.…”

Section: Deposition Of Sorption and Photocatalytic Materials On Nanofibers And Textiles By Controlled Sublimation Methodsmentioning

confidence: 98%

“…The deposition of sorption material with photocatalytic regeneration directly on the surface of individual nanofibers is another possibility for the preparation of protective sorption textiles. The basic photocatalytic porous nanostructure of Si-O-Zn was in this case doped with dispersed nanoparticles of graphite or graphitic carbon nitride [11]. During the precipitation reaction, the insoluble silicate nanomaterial Si-O-Zn was fixed preferentially on the surface of the fibers by heterogeneous nucleation, and gradually coated most of their surface during the subsequent growth.…”

Section: Deposition Of Sorption and Photocatalytic Materials On Nanofibers And Textiles By Controlled Sublimation Methodsmentioning

confidence: 99%

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Lamelary Aggregation of Nanoparticles from Frozen Liquid on the Sublimation Interface—Experimental Preparation and Application of Nanomaterials

Dvorský

Svoboda

Bednář

2021

Nanoparticles’ Preparation, Properties, Interactions and Self-Organization

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“…Nanofibrous fabric, NnF MBRANE ® -PUR, from the company PARDAM was chosen for its good chemical resistance and the possibility of making single-fiber coating according to our previous work [87].…”

Section: Introductionmentioning

confidence: 99%

Design and Performance of Novel Self-Cleaning g-C3N4/PMMA/PUR Membranes

et al. 2020

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In the majority of photocatalytic applications, the photocatalyst is dispersed as a suspension of nanoparticles. The suspension provides a higher surface for the photocatalytic reaction in respect to immobilized photocatalysts. However, this implies that recovery of the particles by filtration or centrifugation is needed to collect and regenerate the photocatalyst. This complicates the regeneration process and, at the same time, leads to material loss and potential toxicity. In this work, a new nanofibrous membrane, g-C 3 N 4 /PMMA/PUR, was prepared by the fixation of exfoliated g-C 3 N 4 to polyurethane nanofibers using thin layers of poly(methyl methacrylate) (PMMA). The optimal amount of PMMA was determined by measuring the adsorption and photocatalytic properties of g-C 3 N 4 /PMMA/PUR membranes (with a different PMMA content) in an aqueous solution of methylene blue. It was found that the prepared membranes were able to effectively adsorb and decompose methylene blue. On top of that, the membranes evinced a self-cleaning behavior, showing no coloration on their surfaces after contact with methylene blue, unlike in the case of unmodified fabric. After further treatment with H 2 O 2 , no decrease in photocatalytic activity was observed, indicating that the prepared membrane can also be easily regenerated. This study promises possibilities for the production of photocatalytic membranes and fabrics for both chemical and biological contaminant control.Polymers 2020, 12, 850 2 of 20 aqueous solutions [11][12][13][14]. Adsorption by activated carbon is the most used method of dye removal due to good removal efficiency of a wide variety of dyes. Performance is dependent on the type of carbon used and the characteristics of the wastewater. The removal rate can be improved using massive doses of activated carbon. However, the re-use of regenerated activated carbon results in a steep reduction in adsorption capacity and the efficiency of dye removal becomes unpredictable and dependent on massive doses of such re-used activated carbon. Activated carbon is also very expensive and its reactivation results in 10%-15% loss of the sorbent [15][16][17].A promising method in order to overcome issues such as limited sorption capacity and regeneration is the use of materials with photocatalytic activity. Carbon nitride (g-C 3 N 4 ) is a metal-free organic semiconductor. This material is an attractive candidate in the field of photocatalysis due to its chemical stability, non-toxicity, straightforward preparation procedure and ability to absorb light efficiently in the visible range due to a narrow band gap (2.7 eV) [18][19][20]. g-C 3 N 4 has been used in photocatalytic applications such as water splitting [21,22], the photocatalytic degradation of air pollutants, such as NOx [23,24], water pollutants such as the dyes, rhodamine B [25][26][27], methyl orange [28], and methylene blue [29][30][31], and other industrial pollutants such as antibiotics [32] or phenols [33][34][35]. In recent years, g-C 3 N 4 was also successfully tes...

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Deposition of Sorption and Photocatalytic Material on Nanofibers and Fabric by Controlled Sublimation

Cited by 3 publications

References 4 publications

Antimicrobial Synergistic Effect Between Ag and Zn in Ag-ZnO·mSiO2 Silicate Composite with High Specific Surface Area

Antimicrobial Synergistic Effect Between Ag and Zn in Ag-ZnO·mSiO2 Silicate Composite with High Specific Surface Area

Lamelary Aggregation of Nanoparticles from Frozen Liquid on the Sublimation Interface—Experimental Preparation and Application of Nanomaterials

Design and Performance of Novel Self-Cleaning g-C3N4/PMMA/PUR Membranes

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