An Fe₃O₄@SiO₂@polypyrrole magnetic nanocomposite for the extraction and preconcentration of Cd(ii) and Ni(ii)

Abstract

This work describes a novel Fe 3 O 4 @SiO 2 @polypyrrole magnetic nanocomposite and its application in the preconcentration of Cd(II) and Ni(II) ions. The parameters affecting the preconcentration procedure were optimised by a Box-Behnken design using response surface methodology. Three variables (extraction time, magnetic sorbent amount, and pH) were selected as the main factors affecting the sorption step, while four variables (type, volume and concentration of the eluent, and elution time) were selected as the main factors in the optimisation study of the elution step. Following the sorption and elution of analytes, the ions were quantified by FAAS. The limits of detection were 0.3 and 1.2 ng mL À1 for Cd (II) and Ni(II) ions, respectively. All the relative standard deviations were less than 8.8%. The obtained sorption capacities (in mg g À1 ) of this new sorbent were 120 for Cd(II) and 98 for Ni(II). Ultimately, this nanocomposite was successfully applied to the rapid extraction of trace quantities of heavy metal ions from seafood samples, and satisfactory results were obtained.

Synthesis and characterization of a Ni nanoparticle stabilized on Ionic liquid‐functionalized magnetic Silica nanoparticles for tandem oxidative reaction of primary alcohols

“…[27] In the last two decades, many types of the reengineering approaches in the organic transformations were reported based on tandem oxidative or reductive processes. [28] In continuation of our interest to design the nanocatalyst and oxidation of alcohols, [8,29] herein, we aimed to produce the new ionic liquid functionalizedmagnatic silica NPs and immobilize the Ni NPs onto their surfaces as a catalyst system for aerobic oxidation of primary alcohols (Scheme 1).…”

“…In continuation of our interest to design the nanocatalyst and oxidation of alcohols, herein, we aimed to produce the new ionic liquid functionalized‐magnatic silica NPs and immobilize the Ni NPs onto their surfaces as a catalyst system for aerobic oxidation of primary alcohols (Scheme ).…”

Magnetite nanoparticles surface-modified with a zinc(II)-carboxylate Schiff base ligand as a sorbent for solid-phase extraction of organochlorine pesticides from seawater

“…The efforts have been paid to the preparation of effective sorbents for appropriate interaction with target analytes. To obtain an efficient magnetic sorbent, the surface modification of magnetic materials have been frequently developed to fabricate different organic or inorganic shell on the magnetic substrates [15]. A variety of methods has been utilized extensively to modify the surface of magnetic nanoparticles for effective and selective interaction with target analyte [16].…”

ZnO NPs: an efficient and reusable nanocatalyst for the synthesis of nitrones from DAG using H2O as a solvent at room-temperature

“…In recent years, nano-catalysts have found many applications in organic synthesis and analytical chemistry [26][27][28][29][30][31][32][33][34]. Among transition metal NPs, ZnO NPs have been of considerable interest because of the role of ZnO in solar cells, catalysts, antibacterial materials, gas sensors, luminescent materials, and as a photocatalyst.…”