Low temperature, rapid solution growth of antifouling silver-zeolite nanocomposite clusters

Yee, Maxine Swee-Li; Khiew, Poi Sim; Tan, Yuen Fen; Chiu, Wee Siong; Kok, Yih-Yih; Leong, Chee‐Onn

doi:10.1016/j.micromeso.2015.07.004

Cited by 27 publications

(6 citation statements)

References 65 publications

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“…For the silver-loaded parent zeolites Ag@Zeo1 and Ag@Zeo2 (desilication time = 0), the silver loadings are respectively equal to 11.0% wt and 7.9% wt, which is close to the values reported in the literature for similar materials [44][45][46].…”

Section: Silver Loadingsupporting

confidence: 83%

Desilicated ZSM-5 zeolites for optimized xenon adsorption at very low pressure

Millet

Courtney

Gossard

et al. 2023

Microporous and Mesoporous Materials

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Section: Silver Loadingsupporting

confidence: 83%

Desilicated ZSM-5 zeolites for optimized xenon adsorption at very low pressure

Millet

Courtney

Gossard

et al. 2023

Microporous and Mesoporous Materials

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“…Similarly, the AgNPs loading on zeolites led to a decrease in S BET and total pore volume, as well as an increase in average pore diameter in comparison with silver-free precursors, which is attributed to the position of AgNPs in the zeolites’ cavities. Such changes in specific surface area and pore dimensions were also observed with the increasing in metallic Ag uptake in Ag–ZSM-5 nanocomposites [ 29 ]. Interestingly, the surface area and volume of micropores in the samples Ag–Zeo and Ag–NaZeo were calculated to be zero, indicating that those sites were blocked with tiny silver clusters or nanoparticles.…”

Section: Resultsmentioning

confidence: 90%

“…Flores-López et al achieved AgNPs by heating silver-exchanged natural chabazite in air at 400 °C for 1 h [ 28 ]. Other authors used chemical reducing agents such as sodium borohydride to reduce Ag + supported on zeolite to AgNPs-containing nanocomposites [ 21 , 26 ] or trisodium citrate solution to treat silver-ion-immobilized ZSM-5 zeolite [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Exchangeable Ions in Natural and Modified Zeolites on Ag Content, Ag Nanoparticle Formation and Their Antibacterial Activity

et al. 2021

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To broaden the application of silver nanoparticles (AgNPs), which are well-known antibacterial agents, they are supported on different substrates to prevent aggregation, increase their surface area and antibacterial efficiency, and to be separated from the system more effectively at the end of treatment. To produce nanocomposites that consist of silver nanoparticles on natural and modified zeolites, silver ions (Ag+) were loaded onto zeolite (natural, Na-modified, H-modified) and then thermally reduced to AgNPs. The effect of the exchangeable cations in zeolite on Ag+ uptake, AgNPs formation, size and morphology was investigated by the TEM, SEM, EDX, XPS, UV-vis, XRD and BET methods. The silver amount in the nanocomposites decreased in the following order Na-modified zeolite > natural zeolite > H-modified zeolite. Microscopic techniques showed formation of AgNPs of 1–14 nm on natural and Na-modified zeolite, while the diameter of metal particles on H-modified zeolite was 12–42 nm. Diffuse reflectance UV-vis and XPS methods revealed the presence of both silver ions and AgNPs in the materials indicating that partial reduction of Ag+ ions took place upon heating at 400 °C in air. Additionally, antibacterial properties of the nanocomposites were tested against Escherichia coli, and it was found that Ag–containing composites originating from the Na-modified zeolite demonstrated the highest activity.

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“…Simultaneously, in [33][34][35], it is outlined that the absence of characteristic peaks does not negate Ag potential presence, as the analysis is constrained by the particle size and concentration. Furthermore, the color change observed from white or pale green (for NZ) to grey (for Ag-NZ) has also been identified as an indicator of metallic silver formation [36]. In light of the aforementioned statements and the observations obtained via SEM and TEM (given below), it is probable that different silver species, including Ag cations, Ag clusters, and nanoparticles are present in the final Ag-NZ composite system.…”

Section: Resultsmentioning

confidence: 95%

Synthesis, Characterization, and Cytotoxicity Evaluations of Silver–Zeolite Nanocomposite

Kiradzhiyska,

Batsalova,

Dzhambazov

et al. 2024

Coatings

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Zeolites of natural origin are materials exhibiting many positive effects on the human body. Silver-modified zeolites have already been introduced as bactericidal agents, although studies dealing with their toxicity are insufficient. This work describes the synthesis of activated and silver-loaded Bulgarian zeolite using a simple wet impregnation method. Morphological characteristics and compositions of natural zeolite, activated zeolite, and Ag-nanocomposites were studied by the X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) methods. Silver loading is approximately 13 wt. %, with mean Ag particle size around 19 nm. Analyses of the samples included antioxidant activity assays based on ABTS radical scavenging ability and in vitro cytotoxicity tests with human normal fibroblasts and three adenocarcinoma cell lines. The experiments were performed with natural, activated, and Ag-modified zeolite in comparison to two commercial food supplements. Our results indicated moderate antioxidant activity of the tested samples. Silver-modified zeolite demonstrated cytotoxic effects against both tumor cells and normal fibroblasts, but the detected levels of inhibition were stronger against the adenocarcinoma cells, suggesting anti-tumor potential. The present article indicates a new aspect of Bulgarian natural zeolite and Ag-loaded zeolite biological activity. It highlights the need for detailed toxicity evaluations of Ag-nanocomposites prior to healthcare applications.

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Low temperature, rapid solution growth of antifouling silver-zeolite nanocomposite clusters

Cited by 27 publications

References 65 publications

Desilicated ZSM-5 zeolites for optimized xenon adsorption at very low pressure

Desilicated ZSM-5 zeolites for optimized xenon adsorption at very low pressure

Effect of Exchangeable Ions in Natural and Modified Zeolites on Ag Content, Ag Nanoparticle Formation and Their Antibacterial Activity

Synthesis, Characterization, and Cytotoxicity Evaluations of Silver–Zeolite Nanocomposite

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