A Review of Silver Nanoparticles: Research Trends, Global Consumption, Synthesis, Properties, and Future Challenges

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The degradation of organic dyes in the presence of modified TiO2 is still under intensive investigation. We report here an evaluation of the photocatalytic activity of nitrogen‐ (N‐) and sulfur‐ (S‐) doped TiO2 for the degradation of phenol and methylene blue (MB). N‐doped TiO2 (N–TiO2), S‐doped TiO2 (S–TiO2), and N–S‐doped TiO2 (N–S–TiO2) were prepared using the sol–gel method. The photocatalytic activity was evaluated in a batch reactor using phenol and MB as models of pollutants. In addition, this investigation was performed using a household lamp as the visible light source. Properties of the synthesized materials in terms of Brunauer–Emmett–Teller (BET) surface analysis, field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), and photocatalytic ability were examined. Our study shows that N–S–TiO2 exhibits better photocatalytic degradation ability for all the considered dyes compared to the other doped TiO2 materials. In conclusion, we have successfully prepared and evaluated the photocatalytic activity of N‐ and S‐doped TiO2 for the degradation of phenol and MB using an ordinary household lamp.

Section: Introductionsupporting

confidence: 77%

Characterization of Titanium Dioxide Doped with Nitrogen and Sulfur and its Photocatalytic Appraisal for Degradation of Phenol and Methylene Blue

Syafiuddin

Hadibarata

Zon

et al. 2017

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“…It is well established that the plasmonic properties of AgNPs are strongly affected by their size and the surrounding media . In general, the results of this study are similar to those previous studies that also investigated the UV–vis spectra of AgNPs in the range 450–500 nm . UV–vis spectroscopy is a commonly used method to study the absorption in the ultraviolet and visible spectral regions.…”

Section: Resultsmentioning

confidence: 99%

“…The use of silver nanoparticles (AgNPs) has been increasing on a global scale particularly in the fields of textiles, technology, health, and food because of their remarkable features . Among these, the health sector has been predicted to show a significant consumption of AgNPs.…”

Section: Introductionmentioning

confidence: 99%

“…In general, AgNPs can be synthesized using several methods, including physical, chemical, and biological . It is unfortunate that chemical or physical synthesis has the potential to be dangerous to the environment . Thus, new studies have been appearing on the synthesis of AgNPs using biological means (green synthesis) by employing natural ingredients.…”

Section: Introductionmentioning

confidence: 99%

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A new green method for the synthesis of silver nanoparticles and their antibacterial activities against gram‐positive and gram‐negative bacteria

Aini

Farraj

Endarko

et al. 2019

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This study aims to evaluate the capability of Ageratum conyzoides and Mikania micrantha extracts to synthesize silver nanoparticles (AgNPs) and their antibacterial capability against gram‐positive and gram‐negative bacteria. Several properties of the synthesized AgNPs, including plasmonic, biomolecule bonding, shape, size, and antibacterial, were investigated. Ultraviolet–visible (UV–vis) spectroscopy was employed for characterizing their plasmonic properties. Functional groups on the produced AgNPs were investigated by Fourier‐transform infrared (FT‐IR) spectroscopy. The size and shape of the AgNPs were identified using the field‐emission scanning electron microscopy (FESEM). Inhibition zone measurement was carried out for evaluating the antibacterial capability. This study showed that the extracts of A. conyzoides and M. micrantha were able reducing agents as evidenced by the formation of the spherical AgNPs. UV–vis spectroscopy, FT‐IR spectroscopy, and FESEM confirmed the physicochemical characteristics of AgNPs. AgNPs that were synthesized using M. micrantha were slightly smaller than those produced using A. conyzoides. In general, the present work establishes that the synthesized AgNPs have antibacterial capability depending on their size and synthesis procedure.

“…Preparation of antibacterial textiles can be achieved by designing them with a simple technique using metal nanoparticles with sizes ranging from 1 to 100 nm . Various approaches have been proposed to modify textiles with nanomaterials, such as sol–gel technique, magnetron sputter‐coating, plasma deposition, and layer‐by‐layer formation.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Antibacterial Capability of Cotton Textiles Coated with TiO₂–SiO₂/Chitosan Using Hydrophobization

Rilda

Safitri

Agustien

et al. 2017

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Since textiles have a porous and hydrophilic structure, they are ideal substrates for the settlement and growth of pathogenic bacteria. Therefore, fabrication of hydrophobic textiles to reduce their humidity has the potential to inhibit the growth of bacteria. On this basis, we report here an improvement of the antibacterial capability of textiles coated with TiO2–SiO2/chitosan using hydrophobization. Synthesis of TiO2–SiO2 clusters with chitosan was carried out using the sol–gel technique. In addition, hydrophobization of the textiles using hexadecyltrimethoxysilane (HDTMS) was carried out using a dip‐spin coating method. In addition, their characteristics were examined using X‐ray diffraction (XRD), scanning electron microscopy (SEM), UV–vis diffuse reflectance spectra (UV‐DRS), Fourier transform infrared (FTIR), water contact angle, and antibacterial activity. XRD, SEM, UV‐DRS, FTIR, and water contact angle confirmed the physical and chemical properties of the modified textiles. In summary, the present work shows that the hydrophobization of textiles using HDTMS can enhance the antibacterial capability of cotton textiles.