Magnetite–Polypeptide Hybrid Materials Decorated with Gold Nanoparticles: Study of Their Catalytic Activity in 4-Nitrophenol Reduction

2012 ◽  
Vol 116 (46) ◽  
pp. 24717-24725 ◽  
Author(s):  
G. Marcelo ◽  
A. Muñoz-Bonilla ◽  
M. Fernández-García
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Hybrid Materials ◽  
Nitrophenol Reduction

scholarly journals Green synthesis of gold nanoparticles using aspartame and their catalytic activity for p-nitrophenol reduction

2015 ◽  
Vol 10 (1) ◽  
Author(s):  
Shufen Wu ◽  
Songjing Yan ◽  
Wei Qi ◽  
Renliang Huang ◽  
Jing Cui ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Green Synthesis ◽  
Nitrophenol Reduction

scholarly journals Size controlled green synthesis of gold nanoparticles using Coffea arabica seed extract and their catalytic performance in 4-nitrophenol reduction

RSC Advances ◽  
2018 ◽  
Vol 8 (44) ◽  
pp. 24819-24826 ◽  
Author(s):  
N. K. R. Bogireddy ◽  
U. Pal ◽  
L. Martinez Gomez ◽  
V. Agarwal
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Green Synthesis ◽  
Coffea Arabica ◽  
Room Temperature ◽  
Catalytic Performance ◽  
Seed Extract ◽  
Size Dependent ◽  
Nitrophenol Reduction ◽  
Size Controlled

Size dependent catalytic activity of AuNPs synthesized at room temperature from Coffea arabica seed extract.

scholarly journals Catechin-capped gold nanoparticles: green synthesis, characterization, and catalytic activity toward 4-nitrophenol reduction

2014 ◽  
Vol 9 (1) ◽  
pp. 103 ◽  
Author(s):  
Yoonho Choi ◽  
Myung-Jin Choi ◽  
Song-Hyun Cha ◽  
Yeong Kim ◽  
Seonho Cho ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Green Synthesis ◽  
Nitrophenol Reduction

Efficient Reusable Gold-Mesoporous Silica Nanocatalysts for Aromatic Nitro Reduction: Role of Phenolic Chelating Ligands on Immobilizing Gold Nanoparticles and Catalytic Activity

NANO ◽  
2022 ◽  
Author(s):  
Mehboobali Pannipara ◽  
Abdullah G. Al-Sehemi
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Photoelectron Spectroscopy ◽  
Reusable Catalyst ◽  
X Ray ◽  
Transmission Electron ◽  
Nitrophenol Reduction ◽  
Aromatic Nitro ◽  
Strong Attachment

Developing heterogeneous metal nanocatalysts is highly desirable since the catalyst can be easily separated and reused for several times. In this manuscript, we have immobilized gold nanoparticles (AuNPs) on the surface of mesoporous silica (SiO[Formula: see text] using simple amino acid-based phenolic chelating molecules and utilized as highly reusable catalyst for nitroarene reduction. The synthesized nanocomposites (Au@SiO2-1 and Au@SiO2-2) have been unambiguously confirmed using powder X-ray diffraction (PXRD), Fourier transform infrared (FT-IR), high resolution-transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS). Interestingly, Au@SiO2-1 exhibited highly enhanced 4-nitrophenol reduction that was studied using absorption spectroscopy. Further catalytic activity of Au@SiO2-1 was also explored for 2-nitroaninline and 4-nitroaniline. The reusable studies demonstrated that the catalyst did not show significant change in the activity up to ten cycles. After catalytic reactions studies confirmed the strong attachment of AuNPs on the SiO2 matrix.

Gold Nanoparticles Grafted Mesoporous Silica: A Highly Efficient and Recyclable Heterogeneous Catalyst for Reduction of 4-Nitrophenol

NANO ◽  
2016 ◽  
Vol 11 (09) ◽  
pp. 1650104 ◽  
Author(s):  
Akansha Mehta ◽  
Manu Sharma ◽  
Ashish Kumar ◽  
Soumen Basu
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Surface Area ◽  
Heterogeneous Catalysts ◽  
High Surface ◽  
High Surface Area ◽  
Trisodium Citrate ◽  
Pure Gold ◽  
Nitrophenol Reduction

Synthesis of gold nanoparticles dispersed uniformly on mesoporous silica (mAu/SiO2) by homogeneous deposition–precipitation (HDP) method is used as an effective catalyst for reduction of 4-nitrophenol to 4-aminophenol. Silica provides support and surface area to increase the catalytic activity of gold. X-ray photon spectroscopy revealed binding energy of Au 4[Formula: see text] ([Formula: see text]84.0[Formula: see text]eV) and Au 4[Formula: see text] ([Formula: see text]87.7[Formula: see text]eV) which support the formation of Au0 on SiO2 surface. Au/SiO2 showed Langmuir type-IV isotherms which are the characteristic features of mesoporous materials furthermore, pore size decreases with incorporation of Au NP’s on SiO2 surface. The enhancement is due to the strong interaction of Au0 with silica support. The catalytic conversion was studied by UV-Visible spectroscopy and high performance liquid chromatography (HPLC) quantification method, which shows conversion of nitro group into amino group. In addition, the catalyst was easily separated and reused. The reusability of the catalyst exhibited better reduction of the 4-nitrophenol to 4-aminophenol even after 10 consecutive cycles. In comparison to trisodium citrate capped pure gold nanoparticles mAu/SiO2 catalysts showed very good catalytic activity toward nitrophenol reduction. Here we conclude that embedment of metal catalysts like Au into high surface area support like silica is a positive step toward development of novel heterogeneous catalysts.

Carbon Dots Assisted Synthesis of Gold Nanoparticles and Their Catalytic Activity in 4‐Nitrophenol Reduction

2019 ◽  
Vol 4 (12) ◽  
pp. 3416-3422 ◽  
Author(s):  
Souvik Ghosh ◽  
Smith S. Satapathy ◽  
Kowsik Ghosh ◽  
Smita Jauhari ◽  
Subhendu K. Panda ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Carbon Dots ◽  
Nitrophenol Reduction
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