Dissolution Kinetics of Fe3O4 Nanoparticles in the Acid Media

Abstract

The Fe 3 O 4 nanoparticles dissolution in the acid media (pH = 1.8-5.0; 3 h) has been studied. The kinetic curves have been obtained and Fe 3 О 4 solubility has been determined using spectrochemical, gravimetric and atomic absorption methods. Fe 3 О 4 solubility was found to be increased with the increase in inorganic media acidity and the time. By means of SEM, XRD and NMR analyses the effect of acidic media on the physico-chemical properties of Fe 3 О 4 particles surface has been determined. Кeywords: Fe 3 О 4 nanoparticles, solubility, kinetics, acidic media.

Solid-State Schikorr Reaction from Ferrous Chloride to Magnetite with Hydrogen Evolution as the Kinetic Bottleneck

“…Such a formation of near-surface layer Fe 2 O 3 was further corroborated by H 2 evolution during thermolysis of commercial Fe 3 O 4 (3.4% of H 2 per Fe atoms of Fe 3 O 4 ) under otherwise identical reaction conditions. The observation is in good accordance with a report by Tsykhanovska and co-workers in Kharkiv, Ukraine, where TEM analysis showed direct observation of the near-surface layer of Fe 3 O 4 synthesized by solution chemistry …”

“…The observation is in good accordance with a report by Tsykhanovska and coworkers in Kharkiv, Ukraine, where TEM analysis showed direct observation of the near-surface layer of Fe 3 O 4 synthesized by solution chemistry. 78 3.4. Entity of Magnetite Obtained at 500 °C.…”

Fe3O4/CuO/Chitosan Nanocomposites: An Ultrasound-Assisted Green Approach for Antibacterial and Photocatalytic Properties

“…This difference might be due to the presence of other important interactions comparable to electrostatic interactions, such as H-bonding, hydrophobic and hydrophilic interactions, and van der Waals forces . On the other hand, the MB uptake percentage at pH 4 was higher than that at pH 2, possibly due to the dissolution of Fe 3 O 4 nanoparticles . Hence, pH 4 was chosen for further investigation.…”

An Excellent Fe, N Co‐Doped Porous Biomass Carbon Oxygen Reduction Reaction Electrocatalyst: Effect of Zinc‐Based Activators on Catalytic Activity

“…As can be seen, compared to that under alkaline condition, the poor ORR activity in acid condition for the two samples was disclosed ( E onset = 0.71 V; E 1/2 = 0.54 V, J L = 2.74 mA cm −2 for Zn(NO 3 ) 2 ‐Fe/N/C@bio‐C, and E onset = 0.71 V; E 1/2 = 0.51 V, J L = 2.24 mA cm −2 for ZnCl 2 ‐Fe/C/N@bio‐C, respectively), due likely to the instability of Fe 3 O 4 active species in acid condition. [ 32 ]…”