Evaluation of the Efficiency of Detection and Capture of Manganese in Aqueous Solutions of FeCeOx Nanocomposites Doped with Nb2O5

Abstract

: The main purpose of this work is to study the effectiveness of using FeCeOx nanocomposites doped with Nb2O5 for the purification of aqueous solutions from manganese. X-ray diffraction, energy–dispersive analysis, scanning electron microscopy, vibrational magnetic spectroscopy, and mössbauer spectroscopy were used as research methods. It is shown that an increase in the dopant concentration leads to the transformation of the shape of nanoparticles from spherical to cubic and rhombic, followed by an increase in the size of the nanoparticles. The spherical shape of the nanoparticles is characteristic of a structure consisting of a mixture of two phases of hematite (Fe2O3) and cerium oxide CeO2. The cubic shape of nanoparticles is typical for spinel-type FeNbO4 structures, the phase contribution of which increases with increasing dopant concentration. It is shown that doping leads not only to a decrease in the concentration of manganese in model solutions, but also to an increase in the efficiency of adsorption from 11% to 75%.

Features of structure, magnetic state and electrodynamic performance of SrFe12−xInxO19

“…With an increase in in frequency and the substitution concentration by the In 3+ indium cations, which have a large number of electrons, the intensity of the precession of the magnetic moment of electrons increases 63 – 65 and, as a consequence, an increase in the real part μ / of the permeability is observed. Due to the small induced magnetic moment of the In 3+ indium cation itself, with an increase in its concentration 66 – 68 , this insignificantly affects the total value of μ / .…”

A-Site Cation Size Effect on Structure and Magnetic Properties of Sm(Eu,Gd)Cr0.2Mn0.2Fe0.2Co0.2Ni0.2O3 High-Entropy Solid Solutions

“…Thus, at 50 K, it increases from ~4.37 × 10 4 erg/g for the samarium sample by ~193% for the gadolinium sample, and at 300 K, it increases from ~8.09 × 10 3 erg/g for the samarium sample by ~1152% for the gadolinium sample. The H a anisotropy field behaves in different directions at different temperatures [ 60 , 61 , 62 ]. Thus, at 50 K, it falls from ~14.6 × 10 4 Oe for the samarium sample by ~68% for the gadolinium sample, while, at 300 K, it increases from ~2.74 × 10 4 Oe for the samarium sample by ~133% for the gadolinium sample.…”

Tuning Dielectric Loss of SiO2@CNTs for Electromagnetic Wave Absorption

“…The peaks at 709.1 and 721.9 eV in the XPS spectra of Fe 2p can be indexed to metallic Fe. The peaks (717.3 and 733.2 eV) and satellite peaks (712.1 and 724.9 eV) reveal the oxidation state of Fe species in the sample [23][24][25] (Figure 2e). The binding energies of C-C (284.6 eV), C-N (285.7 eV) and C-O (288.7 eV) were observed on the surface of NCNT (Figure 2f) [26,27].…”