Effective modified MWCNT super adsorbent for oxygen and nitrogen adsorption

The CVD method was used to synthesize multi-walled carbon nanotubes (MWCNT), which were modified to increase oxygen and nitrogen gas adsorption. Field emission scanning electron microscopy, Fourier transforms infrared spectra, and X-ray powder diffraction was used to analyze the samples' structure and morphology. According to the adsorption-desorption data, the surface areas of the MWCNT and modified (M-MWCNT) were 240 and 11 m2/g, respectively. Additionally, it had a total pore volume of 0.86 and 0.002 m3/g and an average pore diameter of 14 and 7 nm. At 278 K to 308 K and pressures up to 10 bar, the volumetric setup was utilized to evaluate synthesized adsorbents for gas adsorption, equilibrium, and the kinetics of oxygen and nitrogen adsorption on both samples. The M-MWCNT's adsorption capability for oxygen and nitrogen gases increased by 35 % and 17 %, respectively, at 278 K. To choose the model that best matched the findings, isotherm, and kinetic adsorption models were used to examine the uptake of oxygen and nitrogen gases. The best-fitted models were the Sips isotherm and the Elovich kinetic models. Maximum oxygen and nitrogen gas adsorption were 9.63 and 7.57 mmol/g. The thermodynamic analysis yielded the exothermic process adsorption for both adsorbents. The M-MWCNT performed admirably as a regenerable and selective adsorbent. [Display omitted] •MWCNT and M-MWCNT were synthesized as selective adsorbents.•O2/N2 adsorption was determined to be 9.63 / 7.57 mmol/g at 278 K and 10 bar.•The ability of the M-MWCNTs to adsorb O2/N2 improved by 35 % and 17 %, respectively.