Non-Dispersive Extraction of Chromium(VI) by Cyphos IL102/Solvesso 100 Using the Pseudo-Emulsion-Based Strip...

Area of Science:

• Environmental Chemistry
• Separation Science
• Materials Science

Background:

• Chromium(VI) is a toxic heavy metal pollutant requiring effective removal strategies.
• Non-dispersive extraction with strip dispersion (NDXSD) offers a promising method for separating contaminants.
• Ionic liquids present unique properties for use in extraction processes.

Purpose of the Study:

• To investigate the removal of chromium(VI) from acidic media using NDXSD.
• To evaluate the performance of the ionic liquid Cyphos IL102 supported on a PVDF membrane.
• To determine optimal operating conditions for chromium(VI) transport.

Main Methods:

• Utilized a microporous PVDF membrane in a permeation cell for NDXSD.
• Employed Cyphos IL102 (phosphonium salt) in Solvesso 100 as the organic phase.
• Investigated hydrodynamic parameters (stirring speeds) and chemical parameters (concentrations, carrier concentration).

Main Results:

• Achieved efficient chromium(VI) transport under specific conditions: 0.1 M HCl, 0.01 g/L Cr(VI), 1000 min^-1 feed stirring, 600 min^-1 pseudo-emulsion stirring, and 2-10% v/v carrier concentration.
• Estimated mass transfer coefficients, including bulk diffusion (3.1·10^-7 cm²/s) and membrane diffusion (6.1·10^-8 cm²/s).
• Evaluated system performance against other ionic liquids and in the presence of base metals.

Conclusions:

• NDXSD with Cyphos IL102 and a PVDF membrane is an effective method for chromium(VI) removal.
• Optimized hydrodynamic and chemical parameters significantly enhance chromium(VI) transport efficiency.
• The study provides valuable mass transfer data for process design and optimization.