Extraction kinetics of ruthenium in the mixture of tri-n-butyl phosphate and n-dodecane

Mori

ACS Sustainable Chem. Eng.

et al. 2016

Microwave irradiation efficiently assists extraction of substitution-inert platinum group metals like Ru(III) and Rh(III) from HNO3(aq) to betainium bis(trifluoromethylsulfonyl)amide ([Hbet][Tf2N]) ionic liquid to give nearly quantitative yields within 101–102 s. The rapid microwave heating also facilitates to mix the aqueous/IL biphasic system homogeneously without vigorous shaking because of its thermomorphic behavior. Rapid and efficient extraction of substitution-inert platinum group metals has been achieved in use of thermomorphic ionic liquid and microwave irradiation.

Section: Acs Sustainable Chemistry and Engineeringcontrasting

confidence: 72%

Microwave-Assisted Solvent Extraction of Inert Platinum Group Metals from HNO₃(aq) to Betainium-Based Thermomorphic Ionic Liquid

Mori

ACS Sustainable Chem. Eng.

et al. 2016

“…The experimental result reveal that, the percentage of desorption increases with the increase in nitric acid concentration. This can be attributed to the fact that, Ru exhibit multiple oxidation states such as Ru(II), Ru(III), Ru(IV) and Ru(VIII) and mostly exist in III and IV states in nitric acid and its chemistry varies widely in different concentration of nitric acid forming several species of nitrosyl nitrato ruthenium which affect the separation efficiency [36–37] . High acidity, fast extraction, and slow scrubbing are recommended for better decontamination.…”

Section: Resultsmentioning

confidence: 99%

“…This can be attributed to the fact that, Ru exhibit multiple oxidation states such as Ru(II), Ru(III), Ru(IV) and Ru(VIII) and mostly exist in III and IV states in nitric acid and its chemistry varies widely in different concentration of nitric acid forming several species of nitrosyl nitrato ruthenium which affect the separation efficiency. [36][37] High acidity, fast extraction, and slow scrubbing are recommended for better decontamination. Hence, our results corroborate the earlier reported behavior of ruthenium (III) in nitric acid medium during desorption study.…”

Section: Desorption Studymentioning

confidence: 99%

Graphene Oxide as an Adsorbent for Ruthenium from Aqueous Solution

Mohanty

Yuvaraj²,

Jena

et al. 2022

ChemistrySelect

Graphene oxide (GO) was synthesized by modified Hummers method and its adsorption behavior towards ruthenium (III) from aqueous solution was studied w.r.t contact time, pH, ruthenium (III) concentration, GO dosage, temperature and ionic strength. The synthesized GO and ruthenium(III) adsorbed graphene oxide (Ru‐GO) were characterized by various techniques such as Fourier Transform Infrared Spectroscopy (FTIR), Raman Spectroscopy, X‐Ray Diffraction (XRD), X‐ray Photoelectron Spectroscopy (XPS) and Scanning Electron Microscopy‐Energy Dispersive X‐ray Spectroscopy (SEM‐EDS). Pseudo second order kinetics and Langmuir isotherm model were best fitted in terms of standard deviation and regression coefficient. Adsorption of ruthenium (III) was pH dependent and maximum removal occurred at pH=2 with Kd=2.468×103 mL. g−1. Thermodynamic parameters such as enthalpy (ΔH°), entropy (ΔS°), Gibbs energy (ΔG°), activation energy (Ea) and sticking probability (SP*) were also calculated.Moreover, complete desorption of ruthenium (III) on GO could be achieved at an acidity of 8 M HNO3.

“…Various methods exist to study kinetics of reactive mass transfer in liquid‐liquid extraction and some of them have been applied to the nuclear field for years . The single‐drop method, Nitsch cells, and Lewis cells all offer the possibility to determine a global kinetic constant.…”

Section: Introductionmentioning

confidence: 99%

Experimental Methodology for Kinetic Acquisitions Using High Velocities in a Microfluidic Device

et al. 2019

A theoretical description and an experimental validation of the application of a microfluidic chip with high‐velocity stratified flows for determining chemical kinetics for liquid‐liquid extraction are presented. In the case of uranium extraction under PUREX (plutonium and uranium refining by extraction) process conditions, a simple theoretical model demonstrates the need for high velocities and short residence times of around 10 ms. Confocal microscopy observations of the interface were undertaken to insure the flow stability at such high velocities, and the same experimental protocol was carried out to uranium(VI) extraction at two concentrations. Results show an unexpected variation in the phase homogenization depending on the uranium concentration of the extracted phase.