Gel–based Controlled Synthesis of Silver Nanoparticles and Their Applications in Catalysis, Sensing and Environmental Remediation

Bala, Sukhen; Mondal, Raju

doi:10.1002/slct.201600998

Cited by 7 publications

(4 citation statements)

References 46 publications

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“…They have potential for the adsorption of pollutants because small molecules or metal ions can rapidly diffuse within them easily. The interaction between the gel network and the contaminants causes the contaminants to be effectively fixed inside the gel, , and catalytic centers are readily loaded in the gel matrix for efficient catalysis. − For example, Zhang et al reported a metal–organic gel featuring a catalytic binding pocket to benefit synergistic catalysis for acryl-transfer reactions . Hawkins et al reported that a chiral gel of benzaldehyde and glutamine amide can catalyze the prebiotically relevant aldol dimerization of glycolaldehyde .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a Stable Benzoxazole Gel from an Imine Gel for Adsorption and Catalysis

Chen

Yang

et al. 2021

Langmuir

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Developing stable gel materials for adsorption and catalysis is one of the major themes of gel materials. However, it has been proven to be challenging to achieve them from small molecules. Herein, an imine gel is developed from tetra-aldehyde 4-{2,2-bis[(4-formylphenoxy)methyl]-3-(4-formylphenoxy)propoxy}benzaldehyde (A4) and 3,3′-dihydroxybenzidine (B2) based on dynamic covalent chemistry. The unstable A4B2-imine gel is further converted into a stable aromatic benzoxazole-linked A4B2-benzoxazole gel via oxidative cyclization, which has significantly improved chemical stability under acidic and basic conditions. Benefiting from the stability under acidic conditions, the A4B2-benzoxazole gel is used for Pd(II) adsorption and the adsorption capacity is 250 mg g–1. After PdCl2 immersion and reduction, palladium nanoparticles with a size distribution of 1.3–14.7 nm are encapsulated by the network structure of the stable porous benzoxazole gel matrix. The Pd@A4B2-benzoxazole gel exhibits high catalytic activity toward the reduction of toxic hexavalent chromium Cr(VI) (reaction rate constant = 0.0377 min–1), while there is no significant decrease in the catalytic efficiency after five cycles.

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Section: Introductionmentioning

confidence: 99%

Synthesis of a Stable Benzoxazole Gel from an Imine Gel for Adsorption and Catalysis

Chen

Yang

et al. 2021

Langmuir

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“…Nanoparticles have found applications in multiple fields over the years, ranging from fuel cell catalysts, magnetic resonance imaging contrast agents in medicine, lubrication, environmental remediation, , to catalysis . Given the context of the COVID-19 pandemic, the creation of contact surfaces and fabrics that can kill virus particles upon microbe exposure is an urgent scientific challenge.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Photothermal Disinfecting Properties of Light-Activated Silver Nanoparticles

MacPhee

Kinyenye

MacLean

et al. 2021

Ind. Eng. Chem. Res.

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The medicinal applications of noble metal nanomaterials are of considerable interest due to the unique properties they possess. The following contribution will showcase one of these properties, the photothermal effect produced by silver nanoparticles (AgNPs), and show how AgNPs can serve as potential viricidal materials for PPE (i.e., personal protective equipment) disinfection. In the context of the COVID-19 global pandemic, PPE disinfection is critical for addressing the shortfalls in the supply chains that ensure rapid and reliable sources of PPE for both medical professionals and the public. Two AgNP composites were prepared using both photochemical and pulsed laser ablation in liquid techniques. Then, to improve the durability of the NPs’ coating, they were mixed in a commercially available tent protectant solution or with a chitosan suspension. Transmission electron microscopy and spectroscopic analyses of the AgNP/protectant composites present mostly monodisperse, spherical particles of ∼5–10 nm in diameter, dependent on the route of nanoparticle synthesis. Blue light-emitting diodes (LEDs) were utilized to activate the surface plasmon resonance effects of the AgNP-coated materials at ∼400 nm. The resultant photothermal activation produced elevated surface temperatures on the fabrics, up to 150 °C, approaching the ignition temperature of the fabric samples, and well above the threshold required to deactivate the SARS-CoV-2 virus responsible for the COVID-19 pandemic. Photothermal heating was found to be largely dependent on both proximity of the coated sample surface to the LED source and illumination intensity. Furthermore, the rate of temperature increase was determined to be considerably faster than traditional or photothermal heating studies conducted on aqueous nanoparticle colloids, illustrating the efficiency of this methodology. Finally, durability studies of the AgNP/protectant coatings were examined and were found to maintain photothermal activity over long durations of exposure and after a 3-month storage timeframe. A marginal decrease in heating can be noticed following laundering with traditional detergent cleaners, mainly during the first washing cycle. The coating resistance to washing could be improved by the cross linkage of a biodegradable polymer, chitosan.

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“…It is noteworthy here that arresting a heavy metal-coordinated network in the gel state especially using low-molecular-weight gelators itself is a formidable task. Needless to say, successful execution of such a task primarily depends on the ligand design. − Any judicious design of a heavy metal gelator offers a three-pronged challenge: first, to fit with functional groups containing multiple coordinating sites similar to a typical toxic metal capturing agent; second, the spatial arrangement of functionalities should ensure forming a highly cross-linked, intertwined, three-dimensional network; and finally, to modify the chassis of the ligand particularly the noncoordinating part with functionalities capable of immobilizing a large amount of solvent molecules within the framework, thus fulfilling the most important prerequisite of gelation . In a nutshell, the two-in-one ligand should be a heavy metal capturing agent that also capable of gelation …”

Section: Introductionmentioning

confidence: 99%

Toxic Metal Sequestration Exploiting a Unprecedented Low-Molecular-Weight Hydrogel-to-Metallogel Transformation

Mondal

2018

ACS Omega

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We report herein the development of a unique low-molecular-weight gelator-induced technique for environmental remediation. The motive of this work is wastewater purification using a gel-based toxic heavy metal sequestration. The essence of this technique was to bring two different functionalities, one capable of multiple coordination and another with gel-forming ability, arranged in tandem within a single ligand molecule. Naturally, the success of the approach depends on whether the two tandem-arrayed functionalities are indeed working in tandem. Our results show that the ligand molecule is an excellent example of concomitant hydrogelator and metallogelator. The most interesting aspects of this study involve the toxic metal sequestration of Pb, Cd, and Hg which was further studied in detail with spectroscopic, microscopic, and diffraction techniques. We also report here a rare property of pure organic hydrogel-to-metallogel transformation which could open up a new avenue on wastewater purification. In essence, the hydrogels can be envisaged as a unique class of metal-free zeolite analogue for environmental remediation not by just absorbance but through absorbance cum coordination, which are further corroborated by the inductively coupled plasma-optical emission spectroscopy results.

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Gel–based Controlled Synthesis of Silver Nanoparticles and Their Applications in Catalysis, Sensing and Environmental Remediation

Cited by 7 publications

References 46 publications

Synthesis of a Stable Benzoxazole Gel from an Imine Gel for Adsorption and Catalysis

Synthesis of a Stable Benzoxazole Gel from an Imine Gel for Adsorption and Catalysis

Investigating the Photothermal Disinfecting Properties of Light-Activated Silver Nanoparticles

Toxic Metal Sequestration Exploiting a Unprecedented Low-Molecular-Weight Hydrogel-to-Metallogel Transformation

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