2.3. Characterization of polymeric adsorbents
The Brunauer–Emmett–Teller (BET) surface areas and pore size distributions of the polymeric adsorbents were determined by N2 adsorption on a Micrometrics ASAP 2010 automatic analyser at −196◦C (77K). IR Spectra of the polymers were recorded with Nicolet Nexus 870 Spectrometer. X-ray photoelectron spectrome- ter (VG ESCALAB MK-II) with Mg K