Polyelectrolyte-modified polyethersulfone ultrafiltration membranes for wastewater treatment applications

Retention of Cu(II) and Ni(II) ions by filtration through polymer-modified membranes

“…So they can cause severe problems to public health and to the environment. Therefore several technologies have been developed, and are commonly applied to the decontamination of wastewater, including chemical precipitation [1], ion-exchange [2], coagulation-flocculation [3], flotation [4], electrochemical treatments [5], adsorption [6,7] and membrane filtration [8][9][10][11][12][13][14][15][16][17][18][19][20]. Amongst these technologies, membrane filtration is one of the most promising due to its easiness, low-cost, space saving and high efficiency.…”

“…Another strategy for the removal of metal ions consists in chemical modification of the UF membrane, in particular using charged polyelectrolytes. To our knowledge, the main groups working currently on this subject are the group from Tieke that studied the rejection and separation of ions by membranes prepared upon Layer-by-Layer assembly of various polyelectrolytes and azamacrocycles [12,13], the group from Bruening that studied the nanofiltration of cation metals through alumina membranes modified by adsorption of polyelectrolyte multilayer (PEM) films [14,15], and the group from Kochan that used polyethersulfone membranes functionalized by polyelectrolyte multilayers to realize successfully the treatment of wastewater or the separation of dextran or proteins from aqueous solutions [16][17][18].…”

Enhanced hollow fiber membrane performance via semi-dynamic layer-by-layer polyelectrolyte inner surface deposition for nanofiltration and forward osmosis applications

“…Meanwhile, some research groups have also investigated the possibility of applying LBL deposition on the inner surface of hollow fiber substrate. The common practice involves running the polyelectrolyte solution through the substrate lumen with [7,18] or without [19] applied pressure or even with negative pressure [20] at the shell side.…”

“…Compared with the traditional Langmuir-Blodgett thin-film deposition method, the ease of film formation and film stability and versatility are the main advantages of this new technique [1]. Based on the combination of various polyelectrolyte pairs and substrates, the LBL assembled membranes have been studied for a wide range of applications such as pervaporation [2,3], fuel cell [4], nanofiltration (NF) [5,6] and wastewater treatment [7].…”

Preparation and characterization of polyacrylonitrile membranes modified with polyelectrolyte deposition for separating similar sized proteins

“…In this technique, a membrane with a charged surface is immersed in a solution of a macromolecule carrying opposite charges to those of the membrane surface. Commercial membranes with negative charges on their surface can be directly used [24,25] or classical membranes such as polysulfone and polyacrylonitrile can be functionalized with charged groups by surface modification. Polyelectrolyte multilayer (PEM) show selective permeability for different species ranging from smaller ions to large molecules such as proteins.…”