Characterization of Caesium Carbonate‑Doped Porous Non‑Activated Graphitic (Hexagonal) Boron Nitride and Adsorption Properties

摘要

In this study, the effect of caesium carbonate with a balanced strong base characteristic on the morphology crystallinity,porosity and specific surface area of graphitic boron nitride is reported. The mass ratio of caesium carbonate was adjusted as0.9 and 1.2 at the constant mass of urea and B_2O_3in a mixture of 2 g and 1 g, respectively. The products were characterizedby using infrared spectroscopy (FTIR), powder X-ray diffraction analysis (XRD), scanning electron microscopy (SEM),energy-dispersive X-ray spectroscopy (EDS), high-resolution transmission electron microscopy (HR-TEM) and specificsurface area (SSA) and porosity analysis. gBN formation determined by XRD analysis was accelerated and improved orderedlateral polymorph in which graphitization index was found to be very close to the graphite as 2.02 and 1.84 as for 0.9 and1.2 g dopant level, respectively. The average grain size of the synthesized undoped, 0.9 and 1.2 g caesium carbonate-dopedsamples had 3.61, 10.84 and 12.00 nm, respectively. The porous nature of the product has been confirmed by the SEM andevolution of gaseous material from the surface. The EDX results reveal that the elements used for the preparation of samplesdistribute homogeneously and neither caesium nor carbon atoms enter into the crystal structure indicating the purity ofsamples. The SSA and porosity parameters are found to be about 77.1 m~2/g and 0.1–100 nm range, respectively. Caesiumcarbonate propagated the graphitic nature and crystallinity of BN at a lower temperature than O’Connor method due to risein electronic interaction as a basic compound.