چكيده به لاتين
Biomass-derived porous carbons are the most common adsorbent materials for O2/N2 adsorption because of their excellent textural properties, high surface area, and low expense. A new synthesis method based on a self-activation technique was developed for the new green porous carbon adsorbent. This ecofriendly system was used for the synthesis of hierarchical porous carbons from walnut-shell precursors. The sorbent was successfully synthesized by facile one-step carbonization, with the activating reagents being gases released during the activation. The sample morphology and structure were characterized by Field emission scanning electron microscopy, High-resolution transmission electron microscopy, Raman, Fourier transform infrared spectra, X-ray photoelectron spectroscopy, X-ray powder diffraction, Thermogravimetric, and differential thermal analysis. The optimal porous carbons were synthesized at 1000 °C, providing surface area as high as 2042.4 (m2. g-1) and micropore volume of about 0.499 (m3. g-1). At 298 K under 9.5 bar pressure, the potential for O2/N2 separation using porous carbon samples was studied, and the sips isotherms with the highest adsorption potential were determined to be 2.94 (mmol. gr-1) and 2.67 (mmol. gr-1), respectively. The sample exhibited stable O2/N2 separation in ten cycles, showing the high reusability for air separation. Finally, the technology described presents a promising strategy for producing eco-friendly porous carbon from a variety of biomass on an industrial scale.
