Batch extraction with liquid surfactant membranes: A diffusion controlled model

Abstract

A model of diffusion controlled mass transfer in liquid surfactant membranes is developed for uniform emulsion globules having no internal circulation. The solute is assumed to react instantaneously and irreversibly with the internal reagent a t a reaction surface which advances into the globule as the reagent is consumed. A perturbation solution to the resulting non-linear equations is presented. In general, the zero-order, or pseudo-steady state solution alone often gives an adequate representation of the process. Experimental data on the batch extraction of phenol from waste water are in good agreement with the model predictions.

Effective and selective removal of aromatic amines from water by Cu2+-treated chitosan/alumina nanocomposite

“…Various treatment methods such as oxidation by ozone (Qi et al, 2002), membrane processes (Ho et al, 1982;Sarode et al, 2001), dialysis (Klein et al, 1972), reverse osmosis (Go´mez et al, 2009;Hidalgo et al, 2011), photocatalytic degradation (Kamble et al, 2003), biodegradation (Gheewala and Annachhatre, 1997), and adsorption (Datta et al, 2003) are commonly applied to remove aromatic amines from water. Among these methods, adsorption is considered as a more simple and cost-effective technique for removal of contaminants from water.…”

Polydispersity effect in facilitated transport through liquid surfactant membranes

“…Ho et al [3] improved the model by assuming a diffusion controlled mass-transfer mechanism for emulsion drops of uniform size, and by solving the unsteady-state transport problem in a spherical geometry with changes to the external phase concentration. The continuous phase mass-transfer resistance was considered to be negligible in their model.…”

Zinc and Copper Separation through an Emulsion Liquid Membrane Containing Di‐(2‐Ethylhexyl) Phosphoric Acid as a Carrier

“…ELMs exhibit several attractive features and were invented by Li et al [16][17][18]. These include a large specific surface area for extraction, simultaneous extraction and re-extraction in a single stage, and the requirement only small quantities of an expensive carrier.…”