Catalytic behavior and antibacterial/antifungal activities of new MNPs/zeolite@alginate composite beads

Mekki, Amel; Hachemaoui, Mohammed; Mokhtar, Adel; Ismail, Issam; Bennabi, Farid; Iqbal, Jibran; Rahmani, Khaled; Bengueddach, Abdelkader; Boukoussa, Bouhadjar

doi:10.1016/j.ijbiomac.2021.12.063

Cited by 19 publications

(5 citation statements)

References 54 publications

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“…aureus. In addition, Fe-Cu/ATP shows a certain antibacterial activity without H 2 O 2 , which might be attributed to the sterilization mechanism of the activated Fe and Cu ions. , Another is a long-time and representative method to obtain the antibacterial rate of samples according to GB/T 21510-2008 of China. Briefly, catalytic samples and bacteria were coincubated for 2 days, and the antibacterial rates were calculated using the following formula: R = ( A − B ) / A × 100 % where R is the antibacterial rate, %; A is the number of bacteria recovered in the blank control group, cfu/mL; and B is the number of bacteria recovered in the experimental group, cfu/mL.…”

Section: Resultsmentioning

confidence: 99%

Attapulgite Doped with Fe and Cu Nanooxides as Peroxidase Nanozymes for Antibacterial Coatings

Feng

Zhang

et al. 2022

ACS Appl. Nano Mater.

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The search for low-cost, highly efficient, and stable nanozymes mimicking peroxidase (POD) enzymes remains a great challenge in the development of valuable antibacterial applications. Herein, a natural attapulgite (ATP)-supported Fe and Cu oxide with mixed valences (Fe-Cu/ATP) is reported as an efficient nanozyme by a feasible impregnation method. The obtained Fe-Cu/ATP nanozyme with a large specific area and high dispersity can effectively catalyze the hydrogen peroxide (H 2 O 2 ) decomposition, exhibiting enhanced POD-like activity compared with Fe/ATP, Cu/ATP, and pristine ATP. In addition, the Fe-Cu/ATP showed high stability and reusability. Through further combination with the density functional theory calculation, the electron density of the ATP surface is increased by simultaneously introducing Fe and Cu dopants. Thus, Fe-Cu/ATP possesses excellent antibacterial properties including a short-time effect depending on the POD-like activity with H 2 O 2 and a long-term effect generated by the metal without H 2 O 2 . Finally, a coating desktop and an antibacterial fabric were delicately designed and fabricated by loading Fe-Cu/ATP onto polyethylene and a fabric surface, showing the enormous potential of Fe-Cu/ATP as building and medical functional coatings. This study provides a rational way to design natural mineral nanozymes for promising antibacterial applications.

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Section: Resultsmentioning

confidence: 99%

Attapulgite Doped with Fe and Cu Nanooxides as Peroxidase Nanozymes for Antibacterial Coatings

Feng

Zhang

et al. 2022

ACS Appl. Nano Mater.

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“…The BH 4 − ions donate these electrons to the catalyst, and then the organic dye molecules such as MB capture these electrons from the catalyst surface. Hydrogenation of the MB molecule by the electrons captured by the CuNPs dendrimer leads to the conversion of the (–N=C–) bond to (–NH–C) by breaking the double bond, resulting in the formation of leuco‐MB, a colourless product and known to be less toxic than MB 73 …”

Section: Catalytic Reduction Of Mb Dyementioning

confidence: 99%

“…Hydrogenation of the MB molecule by the electrons captured by the CuNPs dendrimer leads to the conversion of the (-N=C-) bond to (-NH-C) by breaking the double bond, resulting in the formation of leuco-MB, a colourless product and known to be less toxic than MB. 73 The plot of Ln (C t /C 0 ) as a function of time for both samples is shown in Figure 5. The figures show that both materials have a linear shape and a brief induction period.…”

Section: Catalytic Reduction Of Mb Dyementioning

confidence: 99%

Classical and ultrasonic preparation of new dendrimer–Copper nanocomposites: Application in the catalytic reduction, antioxidant, and antimicrobial activities

Zaoui

Daouadji

Beldjilali

et al. 2023

Applied Organom Chemis

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A new dendrimer based on citric acid and sebacoyl chloride was synthesized by Steglich esterification. The obtained dendrimer was used as a matrix for the dispersion of copper nanoparticles using classical and ultrasound methods. All materials were characterized by FTIR, 1H NMR, thermogravimetric analysis, X-ray photoelectron spectrometry, scanning electron microscopy, and energ-ydispersive -X-ray spectroscopy. The obtained nanocomposites were tested against two Gram-positive pathogenic bacteria (Bacillus cereus and Staphylococcus aureus), two Gram negative (Escherichia coli and Pseudomonas aeruginosa), the organic dye methylene blue, and in the 1,1-diphenyl-2-picrylhydrazile radical scavenging assay. A comparative study between both methods in structural, morphological, and thermal properties as well as in the antimicrobial, antioxidant, and catalytic reduction activities was provided. All nanocomposites showed an excellent activity for all applications. The comparison between both synthesis methods shows the superiority of the sonication methods, especially via the catalytic reduction and the antioxidant activities, the classic method allows better thermal stability and a higher metal content with some cationic oxidation state in the obtained nanocomposites, but ultrasound allows a better dispersion with a fully reduced metal.

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“…[27] The use of organic binder is the other efficient approach to prepare zeolitic objects, which can help to avoid reducing the volumetric efficiency as inorganic binders causing clogging of microporous particle surface and therefore lower the mass transfer rate. [28] Normally, this way to prepare zeolitic objects is to mix zeolite powder and organic binder (polymer, such as chitosan, [16,29] alginate, [30] methyl cellulose, [19] polyvinyl alcohol, [31] etc.) homogenously to obtain formulations and to prepare 3D composite based on the cross-link between zeolite and organic part firstly.…”

Section: Introductionmentioning

confidence: 99%

“…However, during the preparation of zeolite beads or other shapes, organic binders, zeolite, or any other co-binders should be mixed in different types of solvent (such as an acid/alkaline-based solvent (acetic acid, NaOH), [16,33,34] saltbased solvent (CaCl 2 ), [30,33] or water together. Then, sample drying processes must be performed on these beads, including by freeze drying or by heating in oven.…”

Section: Introductionmentioning

confidence: 99%

A Novel Process for the Preparation of Binder‐Free Zeolite Beads (Lta‐5a) via Photopolymerization Applied in Co₂ Adsorption Field

Zhang

Josien

Vaulot

et al. 2023

Adv Materials Technologies

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The increasing CO2 concentration in the atmosphere has a severe influence on both the environment and human health, resulting in global warming. According to the high adsorption capacity for CO2 removal, zeolites play an important role for CO2 capture and sequestration. However, its powdery form limits their use in adsorption applications. When binding agents are used, the zeolite porosity is partially occluded that compromises the CO2 adsorption capacity severely. How to prepare binder‐free zeolite beads with a certain structure strength and how to keep the high surface area and porosity are a great challenge. In this work, LTA‐5A beads composites (80 wt.%) are prepared via cationic photopolymerization and then calcination is performed to remove organic part to obtain LTA‐5A beads with different sizes (<1.0 mm, 1.0–2.0 mm, and 2.0–3.0 mm). These beads (0.1 g) are characterized by good mechanical strength without any binder (partial bead fragmentation under 200 g‐load) with a preserved zeolite porosity. This method allows to exploit the zeolite beads reaching a high specific surface area (586 688 m2 g−1) and good CO2 adsorption capacity (4.5‐4.9 mmol g−1). These values are higher than those of commercial LTA‐5A beads (515 m2 g−1 and 3.8 mmol g−1, respectively), which is in agreement with their binder‐free structure.

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Catalytic behavior and antibacterial/antifungal activities of new MNPs/zeolite@alginate composite beads

Cited by 19 publications

References 54 publications

Attapulgite Doped with Fe and Cu Nanooxides as Peroxidase Nanozymes for Antibacterial Coatings

Attapulgite Doped with Fe and Cu Nanooxides as Peroxidase Nanozymes for Antibacterial Coatings

Classical and ultrasonic preparation of new dendrimer–Copper nanocomposites: Application in the catalytic reduction, antioxidant, and antimicrobial activities

A Novel Process for the Preparation of Binder‐Free Zeolite Beads (Lta‐5a) via Photopolymerization Applied in Co₂ Adsorption Field

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Catalytic behavior and antibacterial/antifungal activities of new MNPs/zeolite@alginate composite beads

Cited by 19 publications

References 54 publications

Attapulgite Doped with Fe and Cu Nanooxides as Peroxidase Nanozymes for Antibacterial Coatings

Attapulgite Doped with Fe and Cu Nanooxides as Peroxidase Nanozymes for Antibacterial Coatings

Classical and ultrasonic preparation of new dendrimer–Copper nanocomposites: Application in the catalytic reduction, antioxidant, and antimicrobial activities

A Novel Process for the Preparation of Binder‐Free Zeolite Beads (Lta‐5a) via Photopolymerization Applied in Co2 Adsorption Field

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A Novel Process for the Preparation of Binder‐Free Zeolite Beads (Lta‐5a) via Photopolymerization Applied in Co₂ Adsorption Field