Amine-functionalized
membrane adsorbers are synthesized to adsorb
Cu2+ from acidic solutions (pH 2 HCl). Putrescine (C4)
and ethylenediamine (C2) are covalently attached to poly(glycidyl
methacrylate) films coated on commercial poly(vinylidene fluoride)
membranes. The presence of poly(glycidyl methacrylate) and amines
on the membrane was supported by attenuated total reflectance Fourier
transform infrared spectroscopy (ATR-FTIR). Amine content was quantified
using X-ray photoelectron spectroscopy (XPS). Amine-functionalized
membranes have a permeabilities ranging from 300 to 2650 LMH bar–1 depending on the polymerization reaction time: 0.5
to 6 h. High permeabilities led to filtration times of <2 min for
50 mL of water through a single membrane at 100 kPa. Equilibrium adsorption
experiments revealed maximum capacities of 1.65 and 1.59 mg/g for
putrescine- and ethylenediamine-functionalized membranes, respectivelywhich
are statistically the same. The similar capacities and Langmuir constants
imply that the chain length of the amine (C4 vs C2) does not affect
the binding affinity for Cu2+. This research takes the
first steps toward developing membrane adsorbers for use in medical
isotope purification.
Rare earth elements (REEs) are a vital part of many technologies with particular importance to the renewable energy sector and there is a pressing need for environmentally friendly and sustainable processes to recover and recycle them from waste streams.
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