scholarly journals A New Approach for the Green Biosynthesis of Silver Oxide Nanoparticles Ag2O, Characterization and Catalytic Application

2021 ◽  
Vol 16 (3) ◽  
pp. 651-660
Author(s):  
Brahim El-Ghmari ◽  
Hanane Farah ◽  
Abdellah Ech-Chahad

In this paper, a facile and green approach for the synthesis of silver oxide nanoparticles Ag2O NPs was performed using the extract of the wild plant Herniaria hirsuta (H. hirsuta). Different spectral methods were used for the characterization of the biosynthesized Ag2O NPs, ultraviolet-visible (UV-Vis) spectroscopy gave a surface plasmon resonance (SPR) peak of Ag2O NPs is 430 nm, estimation of direct and indirect forbidden gap bands are respectively 3.76 eV and 3.68 eV; Fourier transform infrared (FTIR) spectral analysis revealed the groups responsible for the stability and synthesis of Ag2O NPs. The morphology of Ag2O NPs was studied by scanning electron microscopy (SEM) showing a nearly spherical shape of Ag2O NPs, and X-ray diffraction (XRD) study confirmed the crystallinity of Ag2O NPs with a crystallinity size of 15.51 nm. The catalytic activity of Ag2O NPs, as well as the rings number were studied by the degradation of methylene blue dye. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 455
Author(s):  
Do-Gak Jeung ◽  
Minseop Lee ◽  
Seung-Min Paek ◽  
Jae-Min Oh

Silver oxide nanoparticles with controlled particle size were successfully obtained utilizing citrate-intercalated layered double hydroxide (LDH) as a substrate and Ag+ as a precursor. The lattice of LDH was partially dissolved during the reaction by Ag+. The released hydroxyl and citrate acted as a reactant in crystal growth and a size controlling capping agent, respectively. X-ray diffraction, X-ray photoelectron spectroscopy, and microscopic measurements clearly showed the development of nano-sized silver oxide particles on the LDH surface. The particle size, homogeneity and purity of silver oxide were influenced by the stoichiometric ratio of Ag/Al. At the lowest silver ratio, the particle size was the smallest, while the chemical purity was the highest. X-ray photoelectron spectroscopy and UV-vis spectroscopy results suggested that the high Ag/Al ratio tended to produce silver oxide with a complex silver environment. The small particle size and homogeneous distribution of silver oxide showed advantages in antibacterial efficacy compared with bulk silver oxide. LDH with an appropriate ratio could be utilized as a substrate to grow silver oxide nanoparticles with controlled size with effective antibacterial performance.


2017 ◽  
Vol 26 (4) ◽  
pp. 1025-1035 ◽  
Author(s):  
Neveen A. Salem ◽  
Mohammed A. Wahba ◽  
Wael H. Eisa ◽  
Marwa El-Shamarka ◽  
Wagdy Khalil

Biomaterials ◽  
2014 ◽  
Vol 35 (13) ◽  
pp. 4223-4235 ◽  
Author(s):  
Ang Gao ◽  
Ruiqiang Hang ◽  
Xiaobo Huang ◽  
Lingzhou Zhao ◽  
Xiangyu Zhang ◽  
...  

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2009 ◽  
Author(s):  
Łukasz Laskowski ◽  
Anna Majtyka-Piłat ◽  
Krzysztof Cpałka ◽  
Maciej Zubko ◽  
Magdalena Laskowska

The synthesis routes are presented for the preparation of nanocomposites composed of nanocrystals placed inside SBA-15 silica pores. The procedures assume treating the silica channels as nanoreactors, where nanocrystals are created as a result of thermal decomposition of internal functional units. Its sizes and chemical composition can be modified by the change of functional group types and density inside silica channels. The procedure is demonstrated by the example of copper pyrophosphate quantum dots and silver oxide nanoparticles inside silica mezochannels. The method can be easily adopted to other types of nanocrystals that can be synthesized inside silica nanoreactors.


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