Direct use of superparamagnetic nanoparticles as electrode modifiers for the analysis of mercury ions from aqueous solution and crude petroleum samples

Abstract

a b s t r a c tSuperparamagnetic nanoparticles previously modified with mercaptopropyltriethoxysilane were employed in this work as electrode modifiers, for direct use in the presence of an external miniature magnet, for the analysis of mercury ions from aqueous solutions, as well as from crude oil. After capturing the mercury ions, the nanoparticles were magnetically concentrated at the electrode surface. The nanoparticles coating exhibited a sharp electrochemical response, and the preconcentration effect led to a strong enhancement of the electrochemical signals. The in situ magnetic coupled electroanalysis was successfully demonstrated for mercury ions and confronted with parallel energy dispersive X-ray fluorescence measurements. Rather consistent results were observed for mercury ions either from aqueous solutions, as well as from the crude oil samples.

Comparison of Cadmium Cd2+ and Lead Pb2+ Binding by Fe2O3@SiO2‐EDTA Nanoparticles – Binding Stability and Kinetic Studies

“…The electrochemical properties of Fe 3 O 4 nanoparticles were described previously. The modified Fe 3 O 4 nanoparticles were used as modifiers of poly(vinyl)pyrrolidone (PVP) to obtain electrode meterial , platinum electrode for Hg(II) ions detection , carbon paste electrode detection of chlorite ions[78, 79], Glassy Carbon (GC) electrode for Sudan I determination in food samples or metal ions such as Cd(II), Pb(II), Cu(II) , and Boron Doped Diamond (BDD) electrode for the detection of a cancer biomarker .…”

“…Fe 3 O 4 @SiO 2 -EDTA nanoparticles were previously obtained and they possess many advantages in comparison to EDTA. These superparamagnetic iron oxide nanoparticles have been applied as an efficient adsorbent for: methylene blue and brilliant green dyes removal from aqueous media [48], separation of rare earths [49], Cu(II), Ca(II) [50][51][52], Cd(II), Pb(II) [53,54], Ag(I), Mn(II), and Zn(II) [55] removal from an aqueous solution, and Hg(II) removal from an aqueous solution and crude petroleum samples [56].…”

Magnetophoresis of Superparamagnetic Nanoparticles Applied to the Extraction of Lanthanide Ions in the Presence of Magnetic Field

“…Magnetic nanohydrometallurgy [8][9][10] deals with the capture of metal ions by superparamagnetic nanoparticles and their magnetophoretic separation for processing the elements. The application of superparamagnetic nanoparticles (Fe 3 O 4 ) coated with the diethylenetriaminepentaacetic (DTPA) complexing agent , for the extraction and separation of lanthanide ions (Ln = La 3+ and Nd 3+ ) , has already been successfully accomplished in our laboratory [22].…”

“…Superparamagnetic nanoparticles (MagNP) are being extensively explored in nanotechnology, and one of the recent applications deals with magnetic separations at the nanoscale (magnetophoresis) [1][2][3][4][5] and elemental processing in the mineral area [6,7] (magnetic nanohydrometallurgy) [8][9][10]. The understanding of such processes can lead to important technological advances in metal ion extraction, separation and recovery, as well as in electrowinning processes, including environmental remediation involving the capture and removal of heavy metal contaminants from industrial effluents [11,12].…”

Green Processing of Strategic Elements Based on Magnetic Nanohydrometallurgy

“…28,[30][31][32][33] As an extension, we here report on our recent advances, extending the NHM technology to a challenging area of the rare earth (RE) elements, particularly the lanthanides. This group of elements is normally found in the trivalent state, and is very important in modern technology because of their applications in catalysis, 34 metallurgy, ceramics, medicine, 35-38 electronics and energy.…”