Ag-Nanoparticle-Loaded Mesoporous Silica: Spontaneous Formation of Ag Nanoparticles and Mesoporous Silica SBA-15 by a One-Pot Strategy and Their Catalytic Applications

Langmuir ◽  
2012 ◽  
Vol 28 (10) ◽  
pp. 4768-4775 ◽  
Author(s):  
Jie Han ◽  
Ping Fang ◽  
Wenjuan Jiang ◽  
Liya Li ◽  
Rong Guo
Keyword(s):  
Mesoporous Silica ◽  
Ag Nanoparticles ◽  
Ag Nanoparticle ◽  
One Pot ◽  
Spontaneous Formation ◽  
Catalytic Applications

Multiple Silver Nanoparticles Anchored Hollow Mesoporous Silica Nanospheres by Polyacrylic Acid Aggregate Templating Approach for Catalytic Reduction of p-Nitrophenol

2018 ◽  
Vol 18 (12) ◽  
pp. 8307-8312 ◽  
Author(s):  
Peng Xu ◽  
Nannan Chen ◽  
Huan Lin ◽  
Changli Cen ◽  
Zhenguo Wu ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Mesoporous Silica ◽  
Polyacrylic Acid ◽  
Ag Nanoparticles ◽  
Catalytic Reduction ◽  
Metal Catalyst ◽  
Silica Nanospheres ◽  
One Pot ◽  
Hollow Mesoporous Silica ◽  
Mesoporous Silica Nanospheres

Anchoring metal cores inside porous shells can endow metal catalyst with high selectivity and stability. Herein, multiple silver nanoparticles were successfully anchored in hollow mesoporous silica nanospheres (Ag@HMSNs) through a facile one-pot method. Polyacrylic acid aggregates self-assembled in water/ethanol solvent were used as core templates and Ag nanoparticles captors, and hexadecyl trimethoxysilane (C16TMS) was used as the pore-making agent. The hollow cavity, encapsulated multiple Ag nanoparticles, and mesoporous silica shell of the Ag@HMSNs were confirmed by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and nitrogen sorption analysis. Just as expected, Ag nanoparticles (2–5 nm) were encapsulated in the cavity of hollow mesoporous silica nanospheres with the size of about 200 nm. The fabricated Ag@HMSNs showed excellent performance for catalytic reduction of p-nitrophenol (4-NP). Also, catalytic activity of the Ag@HMSNs for 4-NP reduction was increased with the addition amount of the pore-making agents and surface areas. The superior catalytic performance was attributed to the unique structural features of Ag@HMSNs architecture, in which the mesoporous shell provided readily accessible pathway for fast transport of reactants to the encapsulated Ag nanoparticles.

Influence of metal oxide and heteropoly tungustate location in mesoporous silica towards catalytic transfer hydrogenation of furfural to γ-valerolactone

2021 ◽  
Author(s):  
Bolla Srinivasarao ◽  
Yogita Y ◽  
Dhana Lakshmi Darsi ◽  
Krishna Kumari Pamula ◽  
N. Lingaiah
Keyword(s):  
Mesoporous Silica ◽  
Metal Oxide ◽  
Transfer Hydrogenation ◽  
Catalytic Transfer Hydrogenation ◽  
One Pot ◽  
Catalytic Transfer

One pot conversion of furfural to -valerolactone by transfer hydrogenation has been achieved over bifunctional Zr and TPA located in mesoporous silica catalysts. Different catalysts with TPA and ZrO2 located...

Synthesis and characterization of dicationic 4,4′-bipyridinium dichloride ordered mesoporous silica nanocomposite and its application in the preparation of 1H-pyrazolo[1,2-b]phthalazine-5,10-dione derivatives

RSC Advances ◽  
2015 ◽  
Vol 5 (33) ◽  
pp. 25816-25823 ◽  
Author(s):  
Aigin Bashti ◽  
Ali Reza Kiasat ◽  
Babak Mokhtari
Keyword(s):  
Mesoporous Silica ◽  
Synthesis And Characterization ◽  
Ordered Mesoporous Silica ◽  
One Pot ◽  
Ordered Mesoporous ◽  
Environmentally Safe ◽  
P Application ◽  
The One ◽  
Solvent Free Synthesis

Application of SBA@BiPy2+ 2Cl− nanocomposite as a novel environmentally safe heterogeneous nanoreactor for the one-pot solvent-free synthesis of 1H-pyrazolo[1,2-b]phthalazine-5,10-dione derivatives.

One-pot deposition of palladium on hybrid TiO2 nanoparticles and catalytic applications in hydrogenation

2012 ◽  
Vol 369 (1) ◽  
pp. 309-316 ◽  
Author(s):  
Afef Mehri ◽  
Hafedh Kochkar ◽  
Stéphane Daniele ◽  
Violaine Mendez ◽  
Abdelhamid Ghorbel ◽  
...  
Keyword(s):  
Tio2 Nanoparticles ◽  
One Pot ◽  
Catalytic Applications

Experimental and theoretical study of the characteristics of LSPR peaks for metal NPs produced by controlling Ar ambient gas pressure to enhance the efficiency of solar cells

2021 ◽  
pp. 1-6
Author(s):  
Serap Yiğit Gezgin ◽  
Abdullah Kepceoğlu ◽  
Hamdi Şükür Kiliç
Keyword(s):  
Metal Nanoparticles ◽  
Ag Nanoparticles ◽  
Solar Spectrum ◽  
Wavelength Region ◽  
Gas Pressure ◽  
Metal Nanoparticle ◽  
Ag Nanoparticle ◽  
Extinction Cross Section ◽  
Ambient Gas ◽  
Ar Gas

In this study, silver (Ag) nanoparticle thin films were deposited on microscope slide glass and Si wafer substrates using the pulsed-laser deposition (PLD) technique in Ar ambient gas pressures of 1 × 10−3 and 7.5 × 10−1 mbar. AFM analysis has shown that the number of Ag nanoparticles reaching the substrate decreased with increasing Ar gas pressure. As a result of Ar ambient gas being allowed into the vacuum chamber, it was observed that the size and height of Ag nanoparticles decreased and the interparticle distances decreased. According to the absorption spectra taken by a UV–vis spectrometer, the wavelength where the localised surface plasmon resonance (LSPR) peak appeared was shifted towards the longer wavelength region in the solar spectrum as Ar background gas pressure was decreased. This experiment shows that LSPR wavelength can be tuned by adjusting the size of metal nanoparticles, which can be controlled by changing Ar gas pressure. The obtained extinction cross section spectra for Ag nanoparticle thin film was theoretically analysed and determined by using the metal nanoparticle–boundary element method (MNPBEM) toolbox simulation program. In this study, experimental spectrum and simulation data for metal nanoparticles were acquired, compared, and determined to be in agreement.

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