(147e) Membrane Adsorbers to Capture Cu from Mixed Metal Acidic Solutions in Support of Radiopharmaceuticals
AIChE Annual Meeting
Monday, November 14, 2022 - 1:50pm to 2:10pm
In this study, glycidyl methacrylate (GMA) brushes are grafted from commercial polyvinylidene fluoride and electrospun chloromethyl styrene membranes using AGET ATRP, a controlled polymerization technique. After grafting poly(GMA), diamine ligands (4-picolylamine, putrescine, or ethylene diamine) are attached to the poly(GMA) brushes by an epoxide ring-opening reaction. Membranes are washed with methanol/DI water, EDTA at pH 10 and HCl at pH 2 to remove residual Cu catalyst from AGET ATRP. Membranes are characterized by ATR-FTIR and x-ray photoelectron spectroscopy (XPS) to support functionalization. Permeability was calculated from pure-water flux experiments in dead-end filtration mode (unmodified PVDF: 5166 LMH/bar, GMA grafted: 4692-648 LMH/bar, and amine-functionalized: 4124-175 LMH/bar). Membrane morphology was examined using scanning electron microscopy (SEM). The binding capacity for Cu, Ni, and Zn were calculated by fitting the Langmuir isotherm to equilibrium adsorption data collected at pH 2. Binding capacity was calculated to be 1.65 and 1.59 for putrescine and ethylenediamine, respectively. Though low, this capacity is 2 orders of magnitude higher than the amount of radiocopper in solution. Dynamic binding experiments were conducted to calculate membrane productivity. The results of this research are laying the groundwork for implementing membrane absorbers as a new separation material for medical isotope purification.