2.3 Characterization of adsorbents before and after iodine adsorption
The pore parameters of the adsorbents were characterized by N2 adsorption/desorption isotherm at 77 K using the ASAP 2460. Powder X-ray diffraction(XRD) patterns were collected with a BRUKER D8 Advance using Cu kα radiation at room temperature with a step size of 0.02°, a scan time of 1 s per step, and 2θ ranging from 5 to 70°. The generator setting was 40kV and 40 mA. Scanning electron microscopy(SEM) used JSM-7800F and energy dispersive spectroscopy(EDS) was carried out using a Tescan Vega3. X-ray Photoelectron Spectrometer(XPS) studies were performed using an Kratos AXIS Supra equipped with a monochromatic Al Kα X-ray source.