Fabrication of Fe3O4@Ag magnetic nanoparticles for highly active SERS enhancement and paraquat detection

2021 ◽  
pp. 107019
Author(s):  
Ying Song ◽  
Jinlei Chen ◽  
Xiaobin Yang ◽  
De Zhang ◽  
Yanqiu Zou ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Sers Enhancement ◽  
Highly Active

Synthesis and characterization of γ-Fe2O3@SiO2–(CH2)3–PDTC–Pd magnetic nanoparticles: a new and highly active catalyst for the Heck/Sonogashira coupling reactions

2019 ◽  
Vol 43 (23) ◽  
pp. 8930-8938 ◽  
Author(s):  
Zahra Tashrifi ◽  
Saeed Bahadorikhalili ◽  
Hossein Lijan ◽  
Samira Ansari ◽  
Haleh Hamedifar ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Active Catalyst ◽  
Synthesis And Characterization ◽  
Coupling Reactions ◽  
Sonogashira Coupling ◽  
Highly Active ◽  
Novel Catalyst

A novel catalyst is synthesized based on the immobilization of palladium on γ-Fe2O3@SiO2–(CH2)3–PDTC nanoparticles and is used as a highly active catalyst for the Heck/Sonogashira coupling reactions.

Magnetic Nanoparticles Supported Acidic Ionic Liquid as a Highly Active and Reusable Catalyst for Esterification

2016 ◽  
Vol 852 ◽  
pp. 485-488 ◽  
Author(s):  
Qiang Zhang ◽  
Xin Zhao ◽  
Xue Hua Zhu ◽  
Ji Hang Li
Keyword(s):  
Ionic Liquid ◽  
Catalytic Activity ◽  
Magnetic Nanoparticles ◽  
Catalytic Performance ◽  
Significant Loss ◽  
Reusable Catalyst ◽  
Hydrogen Sulfate ◽  
External Magnet ◽  
Acidic Ionic Liquid ◽  
Highly Active

A magnetic nanoparticles supported dual acidic ionic liquid catalyst was prepared via anchoring 3-sulfobutyl-1-(3-propyltriethoxysilane) imidazolium hydrogen sulfate onto the surface of silica-coated Fe3O4 nanoparticles. And this novel supported acidic ionic liquid catalyst showed good catalytic performance in esterification. More importantly, the catalyst could be easily recovered by an external magnet and reused six times without significant loss of catalytic activity.

Immobilization of urease on magnetic nanoparticles coated by polysiloxane layers bearing thiol- or thiol- and alkyl-functions

2014 ◽  
Vol 2 (18) ◽  
pp. 2694-2702 ◽  
Author(s):  
R. P. Pogorilyi ◽  
I. V. Melnyk ◽  
Y. L. Zub ◽  
G. A. Seisenbaeva ◽  
V. G. Kessler
Keyword(s):  
Magnetic Nanoparticles ◽  
Enzyme Immobilization ◽  
Magnetite Nanoparticles ◽  
Highly Active

An optimized strategy for production of a highly active magnetic formulation of urease has been elaborated via systematic studies of the enzyme immobilization on magnetite nanoparticles coated by functional siloxane layers.

CoFe2O4 magnetic nanoparticles as a highly active heterogeneous catalyst of oxone for the degradation of diclofenac in water

2013 ◽  
Vol 262 ◽  
pp. 836-844 ◽  
Author(s):  
Jing Deng ◽  
Yisheng Shao ◽  
Naiyun Gao ◽  
Chaoqun Tan ◽  
Shiqing Zhou ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Heterogeneous Catalyst ◽  
Highly Active

Gold immobilized onto poly(ionic liquid) functionalized magnetic nanoparticles: a robust magnetically recoverable catalyst for the synthesis of propargylamine in water

RSC Advances ◽  
2015 ◽  
Vol 5 (43) ◽  
pp. 34502-34510 ◽  
Author(s):  
Firouz Matloubi Moghaddam ◽  
Seyed Ebrahim Ayati ◽  
Seyed Hassan Hosseini ◽  
Ali Pourjavadi
Keyword(s):  
Ionic Liquid ◽  
Magnetic Nanoparticles ◽  
Coupling Reaction ◽  
Highly Active ◽  
Recoverable Catalyst ◽  
Functionalized Magnetic Nanoparticles ◽  
Magnetically Recoverable Catalyst ◽  
Poly Ionic Liquid ◽  
Supported Gold ◽  
Green Conditions

Supported gold(iii) on poly(ionic liquid) coated on magnetic nanoparticles produced a highly active, stable, recoverable and high loading for the synthesis of propargylamines (A3 coupling reaction) under green conditions.

Preparation and Analysis of Magnetic Nanoparticles Used as Highly Active Catalysts over a Wide pH Range

2012 ◽  
Vol 424-425 ◽  
pp. 1057-1061
Author(s):  
Wei Wang ◽  
Tie Long Li ◽  
Ying Liu
Keyword(s):  
Magnetic Nanoparticles ◽  
Precipitation Method ◽  
Fe3o4 Magnetic Nanoparticles ◽  
Ph Adjustment ◽  
Highly Active ◽  
Wide Range ◽  
Iron Leaching ◽  
Wide Ph Range ◽  
Ph Range ◽  
Co Precipitation

In this work, Fe3O4 magnetic nanoparticles with high peroxidase-like catalytic activity and spontaneous pH adjustment ability were successfully prepared by co-precipitation method followed by appropriate thermal treatment. Key synthesis factors were identified and adjusted to tailor the crystallinity, chemical composition and then catalytic property. The crystal structure and Fe (II) content of the catalyst strongly affected its degradation efficiency. Phenol was completely removed by the optimal magnetic nanoparticles under a wide range of pH from 3.0 to 8.0. Additionally, this catalyst exhibited low iron leaching, good reusability and excellent potential to eliminate various organic pollutants from waste water. The reaction mechanism was discussed in terms of the formation of HO• and O2•−/HO2• radicals.

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