Novel functionalization of porous polypropylene microfiltration membranes: via grafted poly(aminoethyl methacrylate) anchored Schiff bases toward membrane adsorbers for metal ions

Abstract

In this work we introduce novel synthetic methods for modification of macroporous polypropylene (PP) membrane with poly(2-aminoethyl methacrylate) (polyAEMA) and subsequent anchoring Schiff base with the aim of adsorbing specific metal ions from aqueous solution. The Schiff base synthesis on the surface of PP membrane was done by a sequence of reactions. First the hydrophobic character of commercial PP membrane (pore diameter 0.4 µm) had been modified via UV irradiation-induced "grafting-from" of poly(2-hydroxyethyl methacrylate) (polyHEMA). The hydroxyl groups of poly(HEMA) were then reacted with the pre-synthesized photoinitiator 4-ethoxy-5-oxo-4,5-diphenylpentanoyl bromide. UV-irradiation was thereafter used for "grafting-from" of poly(2-aminoethyl methacrylate) (polyAEMA). The free amino groups this grafted comb-like brush layer on the surface were reacted with salicylaldehyde to form Schiff base. ATR-FTIR spectroscopy was carried out to determine the functional groups introduction and conversion. Scanning electron microscopy (SEM) images showed the changes between unmodified and modified membrane. Specific surface area was determined by nitrogen adsorption and BET analysis, and water permeability was also measured.The efficiency of membrane adsorbers with Schiff base in the grafted layer in binding Cu (II) ions was determined by atomic absorption spectroscopy. Overall, the established

Laser-induced plasmonic heating on silver nanoparticles/poly(N-isopropylacrylamide) mats for optimizing SERS detection

“…S1), which confirms the transition of monomer into polymers. The N–H vibration in the AEMA segment presenting at 3450 cm −1 shows the incorporation of amine group in the polymer chain …”

“…The N-H vibration in the AEMA segment presenting at 3450 cm À1 shows the incorporation of amine group in the polymer chain. [44] Uncrosslinked PNIPAAm-NH 2 was dissolved in DMF and then electrospun to fabricate PNIPAAm-NH 2 nanofibers. In Fig.…”

Novel adsorptive ultrafiltration membranes derived from polyvinyltetrazole-co-polyacrylonitrile for Cu(II) ions removal

“…In the view of above mentioned difficulties, researchers have reported adsorptive membranes for removal of metal ions from aqueous/wastewater solutions. The adsorptive membranes hold specific functional groups on the surface, which can bind the metal ions through ion exchange or surface complexation, even though the pore size of these membranes is larger than the size of the metal ions [5,[12][13][14][15][16]. Weidman et al reported nanostructured adsorptive membranes for binding of Cu(II) ions from aqueous solutions.…”

“…The active sites for adsorption of Cu(II) ions were created by further chemical reaction between free amino groups of comb-like brush layer and salicylaldehyde. Schiff-base anchored membranes were effective for capturing Cu(II) ions from aqueous solution under optimized experimental conditions [14]. Hence, the functionalized adsorptive polymeric membranes can be suitable for effective removal of metal ions from aqueous/wastewater solutions either by static or dynamic adsorption.…”

High hydrophilicity and excellent adsorption ability of a stretched polypropylene/graphene oxide composite membrane achieved by plasma assisted surface modification

“…[1][2][3][4][5] Compared with the other polymer-based membranes, polypropylene (PP) membrane is an appropriate choice for the applications of separation or adsorption due to its good processability, good mechanical property, excellent resistance to chemicals and low cost. To date, many strategies have been developed to purify the contaminated water or air.…”