Application of magnetic extractant for the removal of hexavalent chromium from aqueous solution in high gradient magnetic separator

Effect of Mn(II) and Phytic Acid on Cr(VI) in the Ferrihydrite-Cr(VI) Co-precipitates: Implication for the Migration Behavior of Cr(VI)

“…Cr­(VI) in the suspension of co-precipitates was distributed in the co-precipitates (non-desorbable Cr­(VI)), on the surface of co-precipitates (desorbable Cr­(VI)), and in the solution (aqueous Cr­(VI)). Desorbable Cr­(VI) was extracted from co-precipitates by Na 2 HPO 4 before determination …”

“…Desorbable Cr(VI) was extracted from co-precipitates by Na 2 HPO 4 before determination. 38 Cr(VI) concentrations on the surface of the solid phase (desorbable Cr(VI)) and in the liquid phase (aqueous Cr(VI)) were determined with the 1,5-diphenylcarbazide spectrophotometry at the wavelength of 540 nm using a UV−visible spectrophotometer (UV2400, SDPTOP, China). 39 Nondesorbable Cr(VI) concentration was obtained by subtracting the desorbable Cr(VI) and aqueous Cr(VI) concentration from the total Cr(VI) concentration in the suspension.…”

Magnetic adsorption separation (MAS) process: An alternative method of extracting Cr(VI) from aqueous solution using polypyrrole coated Fe 3 O 4 nanocomposites

“…Theory on magnetism suggests that the presence of fine wire elements within the magnetic field line tends to distort the path lines thus creating very large magnetic field gradients within the separation chamber [46]. This effect enables even weakly magnetic particles flowing within this region to be easily captured.…”

Botryococcus braunii cells: Ultrasound-intensified outdoor cultivation integrated with in situ magnetic separation

“…This was primarily influenced by two factors. First, the lower flow rate increased the contact time between the particle-tagged cells and the magnetic drum (Wang et al, 2012), while the higher flow rate resulted in a lower contact time and inadequate adsorption by the particles-cells mixture onto the magnetic drum. Second, the hydrodynamic force increased as the flow rate increased and would wash the aggregates away from the surface of the magnetic drum.…”