Micellar enhanced ultrafiltration (MEUF) of metal cations with oleylethoxycarboxylate

Preparation of a polyvinylidene fluoride tree-like nanofiber mat loaded with manganese dioxide for highly efficient lead adsorption

“…It was obvious that the decreased M-OH area ratio equaled to that of M-O, which meant that the M-OH and M-O groups on the surface of PVDF/TBAC-PPy-MnO 2 adsorbent participated in the Pb 2+ adsorption process. The main adsorption mechanism maybe an exchange reaction between Pb 2+ and protons existed on the surface of manganese oxide, 24 which may be written as eqn (11)- (14):…”

“…Various techniques have been used for this aim, including chemical precipitation, 8,9 chemical reduction, 10 ion exchange, 11,12 membrane separation, 13 ultraltration, 14 biological treatment, 15 and adsorption, etc. [16][17][18] Among them, adsorption is an effective and versatile method that is capable of removing trace levels of heavy metal ions from dilute solutions.…”

Co-assembly in chitosan–surfactant mixtures: thermodynamics, structures, interfacial properties and applications

“…Correspondingly, mixtures of chitosan (Mw = 100 kDa, DA = 0.15) and alkyl oligooxyethylene carboxylic acids have recently been shown to form soluble, versatile and strongly pH-responsive complexes [73,74,87,123] with much less precipitation tendency then their normal alkyl carboxylic acid counterparts. Alkyl oligooxyethylene carboxylic acids are by themselves highly interesting surfactants: depending on pH, they present typical properties of ionic and non-ionic surfactants [124][125][126]. Moreover, the structures formed in aqueous solutions do not depend on pH and temperature only, but also on the chemical architecture of the surfactant, i.e., the relative length of the hydrophobic and hydrophilic part of the molecule [127].…”

Optimization of Enhanced Ultrafiltration Conditions for Cd with Mixed Biosurfactants Using the Box-Behnken Response Surface Methodology

“…However, chemical surfactants have the shortcomings of high critical micelle concentrations (CMCs), the need to use large amounts for functionality and a high possibility of introducing secondary pollution, which restrict the promotion and application of MEUF. Although biosurfactants feature low CMCs and no secondary pollution, there are very few studies of their application in MEUF [23,24]. Therefore, this work uses a mixture of the environmentally friendly biosurfactants rhamnolipids and sophorolipids as a source of micelles and investigates their effect on the ultrafiltration of Cd.…”