scholarly journals Single Metal of Silver Nanoparticles in the Microemulsion for Recyclable Catalysis of 4-Nitrophenol Reduction

2017 ◽  
Author(s):  
Shizhen Zhao ◽  
◽  
Liping Duan ◽  
Chunlin Xiao ◽  
Li Li ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Nitrophenol Reduction

Synthesis of silver nanoparticles within cross-linked lysozyme crystals as recyclable catalysts for 4-nitrophenol reduction

2013 ◽  
Vol 3 (8) ◽  
pp. 1910 ◽  
Author(s):  
Miao Liang ◽  
Libing Wang ◽  
Rongxin Su ◽  
Wei Qi ◽  
Mengfan Wang ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Nitrophenol Reduction ◽  
Recyclable Catalysts ◽  
Lysozyme Crystals

scholarly journals Silver-Nanoparticles Embedded Pyridine-Cholesterol Xerogels as Highly Efficient Catalysts for 4-nitrophenol Reduction

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1486
Author(s):  
Ganesh Shimoga ◽  
Eun-Jae Shin ◽  
Sang-Youn Kim
Keyword(s):  
Silver Nanoparticles ◽  
Trisodium Citrate ◽  
Environmentally Benign ◽  
X Ray Diffraction ◽  
Physico Chemical ◽  
Efficient Reduction ◽  
Nitrophenol Reduction ◽  
Uv Visible ◽  
Average Size

Two xerogels made of 4-pyridyl cholesterol (PC) and silver-nanocomposites (SNCs) thereof have been studied for their efficient reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of aqueous sodium borohydride. Since in-situ silver doping will be effective in ethanol and acetone solvents with a PC gelator, two silver-loaded PC xerogels were prepared and successive SNCs were achieved by using an environmentally benign trisodium citrate dehydrate reducing agent. The formed PC xerogels and their SNCs were comprehensively investigated using different physico-chemical techniques, such as field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), powdered X-ray diffraction (XRD) and UV-Visible spectroscopy (UV-Vis). The FE-SEM results confirm that the shape of xerogel-covered silver nanoparticles (SNPs) are roughly spherical, with an average size in the range of 30–80 nm. Thermal degradation studies were analyzed via the sensitive graphical Broido’s method using a TGA technique. Both SNC-PC (SNC-PC-X1 and SNC-PC-X2) xerogels showed remarkable catalytic performances, with recyclable conversion efficiency of around 82% after the fourth consecutive run. The apparent rate constant (kapp) of SNC-PC-X1 and SNC-PC-X2 were found to be 6.120 × 10-3 sec-1 and 3.758 × 10-3 sec-1, respectively, at an ambient temperature.

scholarly journals Facile Synthesis of Silver Nanoparticles Stabilized by Cationic Polynorbornenes and Their Catalytic Activity in 4-Nitrophenol Reduction

Langmuir ◽  
2013 ◽  
Vol 29 (13) ◽  
pp. 4225-4234 ◽  
Author(s):  
Bharat Baruah ◽  
Gregory J. Gabriel ◽  
Michelle J. Akbashev ◽  
Matthew E. Booher
Keyword(s):  
Silver Nanoparticles ◽  
Catalytic Activity ◽  
Facile Synthesis ◽  
Nitrophenol Reduction

Glycerol as green hydrogen source for catalytic reduction over anisotropic silver nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (105) ◽  
pp. 103471-103477 ◽  
Author(s):  
A. D. Verma ◽  
R. K. Mandal ◽  
I. Sinha
Keyword(s):  
Silver Nanoparticles ◽  
Catalytic Reduction ◽  
Nitrophenol Reduction ◽  
Catalytic Kinetics ◽  
Kinetics Of ◽  
Shape And Size

Effect of shape and size of AgNPs on the catalytic kinetics of p-nitrophenol reduction using glycerol as a hydrogen source.

scholarly journals Fast 4-nitrophenol Reduction Using Gelatin Hydrogel Containing Silver Nanoparticles

2020 ◽  
Author(s):  
Mazhar Ul-Islam ◽  
◽  
Jawad Ali ◽  
Waliullah Khan ◽  
Adnan Haider ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Gelatin Hydrogel ◽  
Nitrophenol Reduction

scholarly journals Room-Temperature Polyol Synthesis of Ag/SiO2 Nanocomposite as a Catalyst for 4-Nitrophenol Reduction

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Canh Minh Thang Nguyen ◽  
Vinh Tien Nguyen
Keyword(s):  
Silver Nanoparticles ◽  
Catalytic Activity ◽  
Ambient Temperature ◽  
Room Temperature ◽  
Apparent Rate Constant ◽  
Polyol Synthesis ◽  
Ultrasonic Probe ◽  
Nitrophenol Reduction ◽  
The Stability ◽  
Xrd Patterns

We prepared silver nanoparticles (AgNP) embedded in SiO2 using a green polyol approach by conducting the synthesis at ambient temperature and pH. Glycerol solutions of SiO2 and silver nitrate were stirred overnight at room temperature. UV-vis spectra and TEM images of the reaction dispersion and XRD patterns of the centrifuged solid confirmed formation of AgNP (6 ± 2 nm) were embedded in SiO2. AAS showed that, about 50% of initial silver was deposited on SiO2. The presence of SiO2 enhanced the formation of AgNP and the stability of Ag/SiO2 in glycerol. The reason for these findings was probably the ultrasonic-probe dispersion of SiO2 in glycerol, which caused chemical interactions between glycerol and SiO2. Compared to bare AgNP, the AgNP/SiO2 demonstrated higher catalytic activity toward 4-nitrophenol reduction by NaBH4. The highest apparent rate constant was approximately 1.1 ∗ 10−4 s−1, comparable with Ag/SiO2 catalysts prepared using other methods. This study proposes a greener polyol method to synthesize SiO2-supported AgNP catalyst that does not require heating or regulating pH of the reaction mixture. This nanocomposite can be used in catalytic, antimicrobial, sensing, and other applications that are using AgNP/SiO2 synthesized by conventional methods.

Polyhedral borane-capped coinage metal nanoparticles as high-performing catalysts for 4-nitrophenol reduction

2019 ◽  
Vol 55 (55) ◽  
pp. 7990-7993 ◽  
Author(s):  
Nathaniel E. Larm ◽  
Dronareddy Madugula ◽  
Mark W. Lee ◽  
Gary A. Baker
Keyword(s):  
Silver Nanoparticles ◽  
Metal Nanoparticles ◽  
Gold And Silver Nanoparticles ◽  
Coinage Metal ◽  
Stabilizing Agent ◽  
Boron Cluster ◽  
High Performing ◽  
Nitrophenol Reduction

Small (<5 nm) gold and silver nanoparticles and their bimetallic counterparts were prepared using the fundamental boron cluster [closo-B10H10]2− as the reducing and stabilizing agent.

Green Synthesis of Silver Nanoparticles Using Chitosan for 4-Nitrophenol Reduction

2012 ◽  
Vol 479-481 ◽  
pp. 332-335 ◽  
Author(s):  
Xin Yang ◽  
Di Geng ◽  
Lian Jin Weng ◽  
Yuan Yuan Han ◽  
Wen Jin Yang
Keyword(s):  
Silver Nanoparticles ◽  
Thermal Treatment ◽  
Green Synthesis ◽  
Sodium Borohydride ◽  
Reducing Agent ◽  
Capping Agent ◽  
Nitrophenol Reduction

In this study, we report a straightforward route for the synthesis of silver nanoparticles by chitosan under moderate thermal treatment. Chitosan acted as both a reducing agent and a capping agent. The synthesized nanocomposites could function as effective catalysts for the reduction of 4-nitrophenol in the presence of sodium borohydride.

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