2.5 Characterization
Results of the flow experiments were characterized by gas chromatography
(GC-FID; Varian 430-GC) equipped with a CP-Sil 5 CB capillary column,
length 30 m (0.25 mm ID, film thickness 1 μm). The carrier gas was
helium (1 mL/min, split ratio 1:80). The oven temperature was maintained
at 50 °C for 5 min and then increased to 200 °C at a rate of 10 °C/min.
The injector temperature was fixed at 250 °C, and the detector
temperature at 275 °C. The results from batch experiments and
breakthrough curve experiments were characterized by nuclear magnetic
resonance spectroscopy (1H-NMR). Nuclear magnetic
resonance spectra were recorded on a Varian 400 MHz instrument. All,1H-NMR are reported in chemical shift (δ, part per
million (ppm)), and were measured relative to the signal of
tetramethylsilane (0 ppm) in the deuterated solvent, unless otherwise
stated.