A5038053578- Radioactive element chemistry and processing
- Phase Equilibria and Thermodynamics
- Toxic Organic Pollutants Impact
- Analytical Chemistry and Chromatography
- Extraction and Separation Processes
- Ionic liquids properties and applications
- Chemical Synthesis and Characterization
- Catalysis and Oxidation Reactions
- Chemical Thermodynamics and Molecular Structure
- Air Quality and Health Impacts
- Nuclear materials and radiation effects
- Carcinogens and Genotoxicity Assessment
- Radioactivity and Radon Measurements
- Atmospheric chemistry and aerosols
- Environmental Toxicology and Ecotoxicology
- Vehicle emissions and performance
- Cyclone Separators and Fluid Dynamics
- Advanced Chemical Sensor Technologies
- Nuclear Materials and Properties
- Icing and De-icing Technologies
- Indoor Air Quality and Microbial Exposure
- Air Quality Monitoring and Forecasting
- Electrochemical Analysis and Applications
- Adsorption, diffusion, and thermodynamic properties of materials
- Forensic Entomology and Diptera Studies
Bhabha Atomic Research Centre
2015-2025
Homi Bhabha National Institute
2020-2025
University of Mumbai
2015
University of Ottawa
2007
World Health Organization - Pakistan
1962
This study presents the first report of direct, acid-free SC CO 2 extraction precious metal Mo from solid matrices, achieving efficient (>90%) and selective recovery secondary sources.
In the present study, we explored extraction of Cd2+ by supercritical fluid carbon dioxide using calixarenes as complexing agents in acidic medium. The optimum conditions for cadmium were found to be 30 min static followed dynamic extraction, a temperature 323 K, pressure 20.27 MPa, CO2 flow rate 2 mL min–1, and nitric acid concentration 0.1 M. Among studied calixarenes, hexaacetylcalix[6]arene gave maximum efficiency (90 ± 2)% presence fluorinated pentadecafluoro-n-octanoic led enhancement...
Abstract In the supercritical fluid extraction of uranium from acidic medium employing TBP as co-solvent, effects various parameters on efficiency were studied. Variation in pressure (80–300 atm), temperature (308–353 K), CO 2 flow rate (0.5–3 mL/min), co-solvent percentage (1–10%), molarity nitric acid (0.5–10 M) found to influence efficiency. The depends distribution ratio and kinetics transport U-TBP complex into . 150–300 atm range, variation was similar that under equilibrium...
The present study describes the extraction of lead(II) from acidic medium with supercritical carbon dioxide using various calixarenes. It involves investigation effect temperature, acid molarity, and metal to complexing agent molar ratio on fluid efficiency. Efficient Pb(II) was observed for p-t-butylcalix(4)arene (92 ± 3)% at 323 K, 20.27 MPa, 30 minute static time followed by dynamic a 1 : 5. ability calixarene established absorption energy dispersive spectroscopy. scanning electron...
Various calixarenes were evaluated for the supercritical fluid extraction of uranium from nitric acid medium. The efficiency was found to be affected by various parameters, namely pressure, temperature, CO2 flowrate, time, and molarity acid. addition HPFOA (pentadecafluoro-n-octanoic acid) production CO2-phillic fluorinated counter ion enhanced efficiency. Under optimized conditions (pressure 200 atm, temperature 323 K, 30 minutes static time followed dynamic flowrate 2 mL min−1, 0.1 M)...
Environmental remediation is challenged by the removal of harmful heavy metal contaminants from industrial waste streams. Because its low cost and great effectiveness, adsorption a commonly used separation method, particularly in environmental cleanup. Inexpensive, biodegradable orange peel-chitosan Fe3O4 magnetic particles (Fe3O4-OP-CS) were combined simple process to create an innovative composite. Their structure morphology studied using Fourier transform infrared spectroscopy (FTIR),...
Sustainable method development for uranium recovery from secondary lean sources (scraps, waste matrices) is a major thrust area achieving net zero by the nuclear industry. Herein we demonstrated simple, two-step crude solid (analytical waste, U content ∼24%) to pure (ammonium diuranate, near-stoichiometric ∼74%) transformation aided direct, acid-free supercritical carbon dioxide (SC CO2) extraction followed precipitation compact extract. Augmenting green quotient, this first systematic study...
Various β-diketones viz. acetylacetone (AA), trifluoroacetylacetone (TFA), hexafluoroacetylacetone (HFA), thenoyltrifluoroacetylacetone (TTA) and heptafluorobutanoylpivaroylmethane (FOD) were evaluated as chelating agents for the supercritical fluid extraction of thorium from tissue paper matrix. In-situ chelation mode was found to be more effective than online mode. A combination tributyl phosphate (TBP) further enhanced efficiency. The efficiency trend observed in all cases was:...
An investigation of Eu(<sc>iii</sc>) CB<italic>n</italic> complexes in solution using calorimetry, TRFS, EXAFS and DFT calculations shows the presence different binding modes depending on cavity size stoichiometry complex.
Imino diacetamide styrene divinyl benzene (IDAA SDVB) resin was synthesized and evaluated for separation of molybdenum (Mo) from simulated dissolver solution irradiated uranium–aluminium alloy. Detailed studies were carried out to understand the influence various parameters on sorption Mo. The kinetics Mo is found be fast data fit well pseudo-second order kinetic equation. Sorption decrease with increase feed acidity. loading capacity determined 30 mg g−1, isotherm Langmuir model. Batch...
Abstract Supercritical carbon dioxide (SC CO 2 ) extraction of uranium from nitric acid medium employing various crown ethers was studied. -phillic C–F bonds in pentadecafluoro- n -octanic (HPFOA) counter ion enhanced the efficiency. Pressure (100−300 atm) and temperature (323−353 K) were found to influence efficiency by affecting SC density as well due large size cluster formation supercritical fluid near critical point thereby resulting reduced interaction with solute. 200 atm 323 K be...