Transport of chromium(VI) through a Cyanex 921‐supported liquid membrane from HCl solutions

Recovery of phenol from aqueous solution by supported liquid membrane using vegetable oils as liquid membrane

“…Beyond 1250 mg/L transport rate becomes constant, probably due to lower effective area for the transport, maximizing the contact area between the aqueous phase and the organic membrane phase can enhance the separation efficiency. Secondly, the decrease in rate of transport may be due to maximization which occurs as a result of saturation of membrane pores with phenol molecules and build up of the layer on the membrane interface, enhancing the retention of the separating constituent on the entry side and thus causing the transport rate to be constant [33,34]. Therefore, a higher transport rate of phenol was obtained when using a higher initial concentration of phenol in the aqueous phase.…”

“…The effect of stirring speed in the feed phase and the receiving phase was studied in order to obtain uniform mixing so as to minimize the thickness of aqueous boundary layer for an effective permeation [33]. In the present work, the aqueous solutions stirring were carried out in the range of 200-700 rpm.…”

Chromium(VI) adsorption from aqueous solution onto Moroccan Al-pillared and cationic surfactant stevensite

“…It is also used in manufacturing pigments, the treatment of metal surfaces and in the tanning of leather [3,4]. Various methods were used to remove chromium from waste waters such as membrane filtration [5], anion exchange resin [6] and adsorption onto different adsorbents [7].…”

Supported liquid membranes technologies in metals removal from liquid effluents

“…0.025 M CCD in PTMS was used as the carrier phase. The selectivity studies were carried out using a mixture of radiotracers 51 Cr, 59 Fe, 99 Mo, 99m Tc, 106 Ru, 137 Cs, 152 Eu and 241 Am, and the results indicated the selective transport of cesium(I) with separation factor values greater than 100. The reproducibility of the transport data was excellent when they are carried out in two successive transport experiments with freshly loaded carrier, but the stability of the membrane was poor, which restricts its long term use.…”