This work aims to the extraction of the priority pollutant 4-nitrophenol (4-NP) from water by emulsion liquid membrane (ELM). Liquid membrane consists of a diluent (hexane) and a surfactant (Span 80). Sodium carbonate solution was used as internal aqueous phase. Effects of important experimental conditions governing the stability of the W/O emulsion were investigated. Influence of operating parameters that affects the permeation of 4-NP such as surfactant concentration, emulsification time, sulfuric acid concentration in external phase, acid type in external phase, internal phase concentration, type of internal phase, stirring speed, volume ratio of internal phase to membrane phase, treatment ratio, 4-NP initial concentration, and diluent type was examined. This study also evaluated the effect of Na 2 CO 3 concentration in the internal aqueous phase on the stripping of 4-NP. Additionally, the reuse of the recovered membrane was studied. Under most favorable conditions, practically all the 4-NP and aniline (AN) molecules present in the feed phase were extracted. The recovery of the membrane phase was total and the extraction of 4-NP was not decreased. The ELM treatment process represents a very interesting advanced separation process for the removal of 4-NP and AN from aqueous solutions.
In this work, the removal of 4-nitrophenol (4-NP) from water by emulsion liquid membrane (ELM) was investigated. An ELM system is made up of hexane as a diluent, Span 80 as the surfactant, and sodium carbonate as the inner aqueous solution. Effect of volume ratio of emulsion to external phase on the extraction of 4-NP was studied in the range of 5/250-90/ 250. The influence of 4-NP initial concentration and salt addition on the permeation of the pollutant was also investigated. The obtained results showed that the volume ratio of emulsion to external phase has a significant effect on the removal of 4-NP using ELM. It was found that by appropriate selection of the extraction and stability conditions, a treatment ratio of 30/250 conducted to excellent removal percentage (>99%). The 4-NP transport was influenced by solute initial concentration. The presence of NaCl in the continuous phase had an impact on the removal percentage, especially at high salt concentrations. The ELM treatment process represents a very interesting advanced separation process for the removal of 4-NP from water.
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