Nanostructured silver decorated hollow silica and their application in the treatment of microbial contaminated water at room temperature

Nishanthi, S.T.; Yadav, K. K.; Baruah, Arabinda; Vaghasiya, Kalpesh; Verma, Rajkumar; Ganguli, Ashok K.; Jha, Menaka

doi:10.1039/c9nj01049a

Cited by 19 publications

(16 citation statements)

References 57 publications

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“…As a response to this problem, hybrids/composites with AgNPs dispersed on carriers or supports have been studied to enhance antibacterial activity compared with sole AgNPs: it is of significance to seek the optimal choice of carriers to combine with AgNPs in order to construct ideal antibacterial agents. Various AgNPs-based nanocomposites with different structures and morphologies have been developed up to now, such as an amorphous silica matrix dispersed with AgNPs [38], AgNPs core@silica shell [39], mesoporous silicas loaded with AgNPs [40], hollow mesoporous silica spheres with AgNPs in the cavity [41,42], fibers coated with AgNPs [43], etc. Although extensive efforts have been devoted to fabricating a lot of these AgNPs-based nanocomposites involving different carriers’ structures, there are still few systematic investigations on the effects of structures on antibacterial performance [44].…”

Section: Introductionmentioning

confidence: 99%

Hydrophilic Silver Nanoparticles Loaded into Niosomes: Physical–Chemical Characterization in View of Biological Applications

Rinaldi

Favero

Moeller³

et al. 2019

Nanomaterials

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Silver nanoparticles (AgNPs) are widely used as antibacterial agents and anticancer drugs, but often their low stability limits their mass production and broad applications. The use of niosomes as a carrier to protect and envelop AgNPs gives a new perspective to solve these problems. In this study, AgNPs were functionalized with sodium 3-mercapto-1-propanesulfonate (3MPS) to induce hydrophilic behavior, improving loading in Tween 20 and Span 20 niosomes (NioTw20 and NioSp20, respectively). Entrapment efficiency was evaluated by UV analyses and is around 1–4%. Dimensions were investigated by means of dynamic light scattering (DLS) (<2RH> = 140 ± 4 nm and <2RH> = 251 ± 1 nm respectively for NioTw20 + AgNPs and NioSp20 + AgNPs) and were compared with those by atomic force microscopy (AFM) and small angle X ray scattering (SAXS) analyses. Stability was assessed in water up to 90 days, and both in bovine serum and human serum for up to 8 h. In order to characterize the local structure of niosomes, SAXS measurements have been performed on Tween 20 and Span 20 empty niosomes and loaded with AgNPs. The release profiles of hydrophilic probe calcein and lipophilic probe Nile Red were performed in HEPES buffer and in human serum. All these features contribute to conclude that the two systems, NioTw20 + AgNPs and NioSp20 + AgNPs, are suitable and promising in the field of biological applications.

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Section: Introductionmentioning

confidence: 99%

Hydrophilic Silver Nanoparticles Loaded into Niosomes: Physical–Chemical Characterization in View of Biological Applications

Rinaldi

Favero

Moeller³

et al. 2019

Nanomaterials

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“…The Langmuir specific surface areas for NH 3 -7.5, NaOH-1, NaOH-2, NaOH-4.5, and NaOH-7.5 were calculated to be 406, 299, 228, 85, and 46 m 2 /g, respectively. The reduced specific surface area was attributed to increased retention of the heavy element Ag in the nanocomposites during CTAB extraction . Both the EDS silver element maps and the reaction yields suggested an increased silver content relating to an increased mesoporous shell thickness and a decreased mesopore size, attributable to a better Ag retention during the ethanol extraction of CTAB process.…”

Section: Resultsmentioning

confidence: 94%

Templated Mesoporous Silica Outer Shell for Controlled Silver Release of a Magnetically Recoverable and Reusable Nanocomposite for Water Disinfection

Furlan

Kisslinger

et al. 2021

ACS Appl. Mater. Interfaces

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In this work, we encapsulated Fe3O4@SiO2@Ag (MS-Ag), a bifunctional magnetic silver core–shell structure, with an outer mesoporous silica (mS) shell to form an Fe3O4@SiO2@Ag@mSiO2 (MS-Ag-mS) nanocomposite using a cationic CTAB (cetyltrimethylammonium bromide) micelle templating strategy. The mS shell acts as protection to slow down the oxidation and detachment of the AgNPs and incorporates channels to control the release of antimicrobial Ag+ ions. Results of TEM, STEM, HRSEM, EDS, BET, and FTIR showed the successful formation of the mS shells on MS-Ag aggregates 50–400 nm in size with highly uniform pores ∼4 nm in diameter that were separated by silica walls ∼2 nm thick. Additionally, the mS shell thickness was tuned to demonstrate controlled Ag+ release; an increase in shell thickness resulted in an increased path length required for Ag+ ions to travel out of the shell, reducing MS-Ag-mS’ ability to inhibit E. coli growth as illustrated by the inhibition zone results. Through a shaking test, the MS-Ag-mS nanocomposite was shown to eradicate 99.99+% of a suspension of E. coli at 1 × 106 CFU/mL with a silver release of less than 0.1 ppb, well under the EPA recommendation of 0.1 ppm. This high biocidal efficiency with minimal silver leach is ascribed to the nanocomposite’s mS shell surface characteristics, including having hydroxyl groups and possessing a high degree of structural periodicity at the nanoscale or “smoothness” that encourages association with bacteria and retains high Ag+ concentration on its surface and in its close proximity. Furthermore, the nanocomposite demonstrated consistent antimicrobial performance and silver release levels over multiple repeated uses (after being recovered magnetically because of the oxidation-resistant silica-coated magnetic Fe3O4 core). It also proved effective at killing all microbes from Long Island Sound surface water. The described MS-Ag-mS nanocomposite is highly synergistic, easy to prepare, and readily recoverable and reusable and offers structural tunability affecting the bioavailability of Ag+, making it excellent for water disinfection that will find wide applications.

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“…After immobilization of silver (Ag) nanoparticles, the diffraction peaks observed at 2θ = 38.1°, 44.2°, 64.3°, and 77.4° can be indexed to (111), (200), (220), and (311) planes of metallic Ag (JCPDS No. 04-0783) (Figure b) …”

Section: Resultsmentioning

confidence: 99%

“…04-0783) (Figure 1b). 43 The 13 C−CPMAS of as-synthesized TATF-COM shows strong resonance signals corresponding to the carbon atoms in different magnetic environment (Figure 1c). A resonance signal at 171 ppm confirmed the presence of triazine ring.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Silver Nanoparticles Immobilized Covalent Organic Microspheres for Hydrogenation of Nitroaromatics with Intriguing Catalytic Activity

Subodh

Prakash

Masram

2020

ACS Appl. Polym. Mater.

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Herein, we present a scalable and economic synthesis of covalent organic microspheres, a highly cross-linked microspherical polymer, through a single step process. The as-synthesized imine-linked microspherical polymer (TATF-COM) was successfully dressed with Ag nanoparticles and characterized by various spectroscopiccum-analytical techniques, demonstrating high thermal and chemical stability. The potent catalytic behavior of as-prepared Ag@TATF-COM was evaluated for the catalytic hydrogenation of nitroaromatics (toxic pollutants) in water along with efficient synthesis of substituted imidazoles and exhibited intriguing catalytic activity with encouragement for reusability. The rate constant and Gibbs free energy for catalytic hydrogenation reaction were calculated to be 0.0226 s −1 and 83.702 kJ/mol, suggesting that the reaction is endothermic, endergonic, and nonspontaneous in nature. We accentuate the significance of shape specific property of COMs that provide a spherical morphology with high surface-to-volume ratio for uniform dressing of Ag nanoparticles. Moreover, we envisage a "catch−react−release" model to explain the catalytic process and investigated in light of experimental results. Thereafter, we have also studied the catalytic efficiency of

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Nanostructured silver decorated hollow silica and their application in the treatment of microbial contaminated water at room temperature

Abstract: Effect of silver decoration on hollow silica and its antimicrobial properties.

Cited by 19 publications

References 57 publications

Hydrophilic Silver Nanoparticles Loaded into Niosomes: Physical–Chemical Characterization in View of Biological Applications

Hydrophilic Silver Nanoparticles Loaded into Niosomes: Physical–Chemical Characterization in View of Biological Applications

Templated Mesoporous Silica Outer Shell for Controlled Silver Release of a Magnetically Recoverable and Reusable Nanocomposite for Water Disinfection

Silver Nanoparticles Immobilized Covalent Organic Microspheres for Hydrogenation of Nitroaromatics with Intriguing Catalytic Activity

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