Silver nanoparticles attached to porous carbon substrates: robust materials for chemical-free water disinfection

Karumuri, Anil Kumar; Oswal, Dhawal Pravin; Hostetler, Heather A.; Mukhopadhyay, Sharmila M.

doi:10.1016/j.matlet.2013.07.021

Cited by 46 publications

(38 citation statements)

References 17 publications

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“…The synthesis of noble metal nanoparticles has been gaining significant importance during the past few years owing to its increasing application in the field of medicine, biology, material science (Vijayakumar et al 2013;Ravindran et al 2013;Narayanan and Park 2013;Xiong et al 2014;Karumuri et al 2013;Geethalakshmi and Sarada 2013;Sharma et al 2009). Among various synthesis procedures (e.g.…”

Section: Introductionmentioning

confidence: 99%

Lippia javanica: a cheap natural source for the synthesis of antibacterial silver nanocolloid

et al. 2015

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Aqueous silver nanocolloid was synthesized in a single step by a biogenic approach using aqueous leaf extract of Lippia javanica plant which acts as both reducing as well as capping agent. The as-synthesized silver nanoparticles were characterized by UV-visible absorption spectroscopy, high-resolution transmission electron microscopy and Fourier transform infrared spectroscopy (FTIR). The UV-Vis absorption spectra of colloidal silver nanoparticles showed characteristic surface plasmon resonance peak centered at a wavelength of 415 nm. The kinetic study showed that the reduction process was complete within 2 h of time. The TEM analysis showed that most of the particles were spherical in shape and their average diameter was about 17.5 nm. FTIR study confirmed the presence of some organic functional groups in leaf extract and their participation during the reduction as well as stabilization process. In addition, the as-synthesized silver nanoparticles showed antimicrobial activity against clinically isolated pathogenic strain of E. coli and B. subtilis.

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Section: Introductionmentioning

confidence: 99%

Lippia javanica: a cheap natural source for the synthesis of antibacterial silver nanocolloid

et al. 2015

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“…E. coli, K12 derivative, was selected as a test microbe due to its role as an indicator of fecal contamination in water. E. coli culture was prepared using a standard method and discussed in earlier reports [1]. The concentration of prepared influent water (E. coli dispersed pure water) was 10 3 CFU ml −1 and used for testing.…”

Section: Antibacterial Performance Testmentioning

confidence: 99%

“…In the case of the filtration test, influent water was passed through a cartridge fitted with the foam sample to be tested. A schematic representation of the experimental setup was shown in an earlier publication [1]. 50 μl aliquots of the water sample were acquired at the start and the end of each filtration step and streaked on three agar plates in order to measure the change in E. coli activity with each pass.…”

Section: Antibacterial Performance Testmentioning

confidence: 99%

Silver nanoparticles supported on carbon nanotube carpets: influence of surface functionalization

et al. 2016

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The effectiveness of nanoparticle-based functional devices depends strongly on the surface morphology and area of the support. An emerging powerful approach of increasing the available surface area without decreasing strength or increasing bulk is to attach arrays of suitable nanotubes on the surface, and to attach the necessary nanoparticles to them. Earlier publications by this team have shown that carpet-like arrays of carbon nanotubes (CNT) can be successfully grown on a variety of larger carbon substrates such as graphite, foams and fabric, which offer hierarchical multiscale supporting architecture suitable for the attachment of silver nanoparticles (AgNPs). A limiting factor of pure CNT arrays in fluid-based applications is their hydrophobicity, which can reduce the percolation of an aqueous medium through individual nanotubes. Previous studies have demonstrated that the treatment of CNT carpets with dry (oxygen) plasma can induce reversible wettability, and treatment with wet (sol-gel) coating can impart permanent wettability. In this paper, we report the influence of such treatments on the attachment of AgNPs, and their effectiveness in water disinfection treatments. Both types of hydrophilic surface treatments show an increase in silver loading on the CNT carpets. Oxygenplasma treated surfaces (O-CNTs) show fine and densely packed AgNP, whereas silica-coated nanotubes (silica-CNTs) show uneven clusters of AgNPs. However, O-CNT surfaces lose their hydrophilicity during AgNP deposition, whereas silica-CNT surfaces remain hydrophilic. This difference significantly impacts the antibacterial effectiveness of these materials, as tested in simulated water containing Gram negative Escherichia coli (E. coli, JM109). AgNPs on silicacoated CNT substrates showed significantly higher reduction rates of E. coli compared to AgNPs on plasma-treated CNT substrates, despite the finer and better dispersed AgNP distribution in the latter. These results provide important insights into different aspects of surface modification approaches that can control the wettability of CNT carpets, and their applicability in water treatment applications.

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“…These materials have also shown promise as size exclusion membrane filters that allow the flow of water while blocking the flow of contaminants [14]. Certain chemical modifications or composites of the mentioned nanomaterials have also been shown as effective for the neutralization of harmful water borne pathogens [15]. The current cost of fabricating these composite graphene or CNT water purification materials make them as yet impractical for commercial sale, however many see these materials as the platform for next generation water purification, with high performance and versatility capabilities [11].…”

Section: Introductionmentioning

confidence: 99%

Activated Carbon, Carbon Nanotubes and Graphene: Materials and Composites for Advanced Water Purification

Sweetman

May²,

Mebberson³

et al. 2017

170

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Abstract:To ensure the availability of clean water for humans into the future, efficient and cost-effective water purification technology will be required. The rapidly decreasing quality of water and the growing global demand for this scarce resource has driven the pursuit of high-performance purification materials, particularly for application as point-of-use devices. This review will introduce the main types of natural and artificial contaminants that are present in water and the challenges associated with their effective removal. The efficiency and performance of recently developed materials for water purification, with a focus on activated carbon, carbon nanotubes and graphene will be discussed. The recent advances in water purification using these materials is reviewed and their applicability as point-of-use water purification systems discussed.

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Silver nanoparticles attached to porous carbon substrates: robust materials for chemical-free water disinfection

Cited by 46 publications

References 17 publications

Lippia javanica: a cheap natural source for the synthesis of antibacterial silver nanocolloid

Lippia javanica: a cheap natural source for the synthesis of antibacterial silver nanocolloid

Silver nanoparticles supported on carbon nanotube carpets: influence of surface functionalization

Activated Carbon, Carbon Nanotubes and Graphene: Materials and Composites for Advanced Water Purification

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