Facile in situ decorating polyacrylonitrile membranes using polyoxometalates for enhanced separation performance

The Design of Ternary Composite Polyurethane Membranes with an Enhanced Photocatalytic Degradation Potential for the Removal of Anionic Dyes

“…The peaks corresponding to oxygen-containing functional groups include C-O (1080 cm −1 ), C-OH (1230 cm −1 ), C = O (1715 cm −1 ), and OH (3320 cm −1 ) all ascribed to the graphene oxide [32]. However, the strong peak at 3320 cm −1 in composite membranes is attributed to the OH group bonded to the N-H group in TPU [33,34]. Another thing to be considered is that the peak intensity corresponding to the N-H group in TPU based membranes increases with the increase in the concentration of aminated graphene oxide (Figure 1 inset).…”

“…The salient features of this technology involve the utilization of metal oxide or metal-based nanoparticles and being non-toxic and cheap in cost, with a high chemical stability and effective reusability characteristics. Loading of nanomaterials into the polymeric membrane structure is another emerging strategy to improve the membrane's performance [33]. Besides other metal oxide-based photocatalytic nanomaterials (such as Fe 2 O 3 , TiO 2 , ZnO, etc.)…”

Polyethylenimine Deposited on Phosphomolybdic-Acid-Loaded Polyacrylonitrile Membranes for Enhanced Dye/Salt Separation

“…It can be observed from Figure d–f that there are increasing granules appearing on the membrane surface from PAN-45P-PG to PAN-85P-PG with severe decrements of pore sizes and numbers, after the introduction of PMo 12 . It has been demonstrated that the higher hydrothermal temperature promoted the loading of PMo 12 into the membrane . The additional loading of strongly electronegative PMo 12 would accelerate the deposition of more electropositive PEI through electrostatic adsorption and coordination assembly, thus leading to the increasing amount of granular substances on the membrane surface.…”

“…Textile wastewater contains high concentrations of carcinogenic organic dyes and inorganic salts, threatening aquatic organisms and human health, and these dyes and salts are inaccessible for effective treatment by traditional physical adsorption and bio- or chemical degradation. − Membrane technology provides an alternative to overcome this dilemma by separating organic dyes and salts from textile wastewater through size sieving. , The membrane separation process not only enables the purification of textile wastewater but also realizes the recycle of organic dyes and salts to achieve “zero discharge” . However, ultrafiltration (UF) is incapable of efficiently removing organic dyes owing to the overly large pore size (5.0–50.0 nm). − Although nanofiltration (NF) can isolate almost all dyes and part of the salts from textile wastewater, the further fractionation of dyes or salts from the mixture is still a barrier due to the overly small pore size (0.5–2.0 nm). , Therefore, a flexible membrane with moderate size between UF and NF is urgently needed for efficient recovery of textile wastewater.…”

“…Polyoxometalates (POMs) are a class of molecular metal-oxide anions composed of transition metals (mostly W, Mo, and V) and oxygen atoms, possessing eminent redox activity, strong charge property, and bactericidal activity, and have brought brilliant advantages into catalysis, medicine, and sensors. − In addition, due to the flexible coordination ability, hydrophilic POMs are accessible to be assembled to the membrane substrate for better wettability . Meanwhile, the strong negative charge of POMs is also beneficial to prevent the adhesion of negatively charged foulants onto the membrane surface, which is favorable for the antifouling performance of the membrane .…”