BF3-Functionalized Silica-Coated Magnetic Nanoparticles as a Novel Heterogeneous Solid Acid for Synthesis of Formazan Derivatives via a Green Protocol

2015 ◽  
Vol 88 (5) ◽  
pp. 662-672 ◽  
Author(s):  
Abdolhamid Bamoniri ◽  
Naimeh Moshtael-Arani
Keyword(s):  
Magnetic Nanoparticles ◽  
Solid Acid ◽  
Functionalized Silica ◽  
Green Protocol ◽  
Heterogeneous Solid

Silica-Sulfuric Acid and Alumina-Sulfuric Acid – Versatile Supported Bronsted Acid Catalysts

2021 ◽  
Author(s):  
Amit Pramanik ◽  
Sanjay Bhar
Keyword(s):  
Sulfuric Acid ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Functionalized Silica ◽  
Bronsted Acid ◽  
Silica Sulfuric Acid ◽  
Brönsted Acid ◽  
Bronsted Acid Catalysts ◽  
Heterogeneous Solid

Abstract: The –SO3H functionalized silica and alumina have emerged as efficient and eco-compatible heterogeneous solid acid catalysts for the construction of various important molecular skeletons. The advantages of –SO3H functionalized...

scholarly journals Efficient N-formylation of primary aromatic amines using novel solid acid magnetic nanocatalyst

RSC Advances ◽  
2020 ◽  
Vol 10 (67) ◽  
pp. 41229-41236
Author(s):  
Jitendra Kumar Yadav ◽  
Priyanka Yadav ◽  
Satish K. Awasthi ◽  
Alka Agarwal
Keyword(s):  
Magnetic Nanoparticles ◽  
Aromatic Amines ◽  
Sulfonic Acid ◽  
Solid Acid ◽  
Recyclable Catalyst ◽  
Primary Amines ◽  
Magnetic Nanocatalyst ◽  
Reaction Conditions ◽  
Primary Aromatic Amines ◽  
First Time

Sulfonic acid functionalized over biguanidine fabricated silica-coated heterogeneous magnetic nanoparticles (NP@SO3H) have been synthesized, well characterized and explored for the first time, as an efficient and recyclable catalyst for N-formylation of primary amines under mild reaction conditions.

Determination of Organophosphorous Pesticides in Environmental Water Samples Using Surface-Engineered C18 Functionalized Silica-Coated Core-Shell Magnetic Nanoparticles–Based Extraction Coupled with GC-MS/MS Analysis

2017 ◽  
Vol 100 (3) ◽  
pp. 804-809 ◽  
Author(s):  
Neha Srivastava ◽  
Supriya Kumari ◽  
Kishore Nair ◽  
Samsul Alam ◽  
Syed K Raza
Keyword(s):  
Magnetic Nanoparticles ◽  
Water Samples ◽  
Environmental Water ◽  
Environmental Water Samples ◽  
Core Shell ◽  
Aqueous Sample ◽  
Functionalized Silica ◽  
Method Performance ◽  
Ms Analysis

Abstract The present paper depicts a novel method based on magneticSPE (MSPE) for the determination of organophosphorus pesticides (OPs) such as phorate, malathion, and chlorpyrifos in environmental water samples. In this study, C18 functionalized silica-coated core-shell iron oxide magnetic nanoparticles (MNPs) were used as a surface-engineered magnetic sorbent for theselective extraction of pesticides from aqueous samples, followed by GC-MS and GC–tandem MS analysis for confirmative determination of the analytes. Various important method parameters, including quantity of MNP adsorbent, volume of sample, effective time for extraction, nature of the desorbing solvent, and pH of the aqueous sample, were investigated and optimized to obtain maximum method performance. Under the optimized instrumental analysis conditions, good linearity (r2 value ≥0.994) was achieved at the concentration range of 0.5–500 μg/L. Recoveries were in therange of 79.2–96.3 and 80.4–97.5% in selective-ion monitoring and multiple reaction monitoring (MRM) modes, respectively, at the spiking concentrations of 1, 5, and 10 μg/L. MRM mode showed better sensitivity, selectivity, and low-level detection (0.5 μg/L) of analytes. The novel MSPE method is a simple, cheap, rapid, and eco-friendly method for the determination of OPs in environmental water samples.

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