On the Behavior of Micellar Solutions in Tangential Ultrafiltration Using Mineral Membranes

Micellar enhanced ultrafiltration of phenolic derivatives from their mixtures

“…Hence, at higher concentration of solute mixture, the only monomer surfactant molecules permeate through the membrane leading to a slight increase in the observed retention of the surfactant. Similar trends of surfactant retention during cross-flow ultrafiltration of CPC solution, in presence of electrolytes have been reported by Tounissou et al [23]. This trend of surfactant and solute retention is observed for the mixture of PNP and BN and is shown in Fig.…”

Comparison of Polysulfone and Ceramic Membranes for the Separation of Phenol in Micellar-Enhanced Ultrafiltration

“…The opposite observation has been explained by the presieving effect that concentration polarization sometimes causes on the surfactant molecules (18,19). An irregular pattern, where the effect of the pressure either has different signs for low and high solute concentration in the bulk solution (15) or else depends on the strength of membrane-surfactant attraction, has also been reported (20). What seems clear is that membranes with MWCO around 50 kDa leak more than 5-to 15-kDa MWCO membranes, but unexpected results comparing membranes of 5-and 10-kDa MWCO with dead-end ultrafiltration were reported (18).…”

“…It is generally agreed that high retentate flow velocity or stirring speed yields a better rejection of surfactant (9,(14)(15)(16), which can be understood in terms of the concentration polarization attenuation that fast retentate flux produces. In contrast, the reported influence of pressure on surfactant rejection is highly varied.…”

Metal ion extraction in microheterogeneous systems

“…The permeate surfactant concentration logically increases if the retentate approaches the viscous gel state, either locally by adsorbing the surfactant on the membrane and forming a so-called polarisation concentration layer, or simply when almost all of the water has been filtered. Salt, pH effects on UF flux, permeate content have been investigated during tangential UF of micellar solutions of CPC, SDS and TX-100 with mineral Zr-Ti oxide membranes [26] and frontal UF with regenerated cellulose membrane of CPC, CTAB, SDS micelles [27] or CTAB, APG, SDS micelles [28].…”