Abstract
Among the new adsorbent forms, nanofiber structures have attracted extra attention because of features such as high surface area, controllable properties, and fast kinetics. The objective of this study is to produce the polyacrylonitrile (PAN) electrospun nanofibers loaded with Ni-MOF-74/MWCNT to obtain maximum CO2 adsorption. The prepared PAN/MWCNT/MOF nanofiber based on the Box–Behnken design (BBD) model suggests the CO2 adsorption of about 1.68 mmol/g (at 25 °C and 7 bar) includes 14.61 w/v%, 1.43 w/w%, and 11.9 w/w% for PAN, MWCNT, and MOF, respectively. The results showed the effective CO2 adsorption of about 1.65 ± 0.03 mmol/g (BET = 65 m2/g, pore volume = 0.08 cm3/g), which proves the logical outcomes of the chosen model. The prepared PAN/MWCNT/MOF nanofiber was characterized using different analyzes such as SEM, TEM, TG, XRD, FTIR, and N2 adsorption–desorption isotherms. More MOF mass loading on the nanofiber surface via secondary growth method resulted in 2.83 mmol/g (BET = 353 m2/g, pore volume = 0.22 cm3/g, 43% MOF mass loading) and 4.35 mmol/g (BET = 493 m2/g, pore volume = 0.27 cm3/g, 65% MOF mass loading) CO2 adsorption at 7 bar for the first and second growth cycles, respectively. This indicates that secondary growth is more effective in the MOF loading amount and, consequently, adsorption capacity compared to the MOF loading during electrospinning.
Highlights
Adsorption is an efficient and low energy-consuming process to capture carbon dioxide. [1,2]
Was utilized to study capacities are determined by measuring the pressure and temperature of the adsorption the CO2 adsorption capacities of Ni-Metal-organic frameworks (MOFs)-74 in powder and nanofibers forms
Ni-MOF-74 of about 788 m2 g−1, the pore volume of 0.38 cm3 g−1, and the average pore diameter of 1.92 nm, which are in agreement with previous studies [51,52]
Summary
Adsorption is an efficient and low energy-consuming process to capture carbon dioxide. [1,2]. [1,2] Adsorbent structural properties, such as volumetric working capacity, pressure drop, mass transfer, and thermal properties, regulate the performance of adsorptive gas separation processes [3]. The fabric structures are often nonwoven composites that display practical features for gas separation application These structures are self-supporting and offer high adsorbent loadings, fast heat and mass transfer rates, low attrition rates, high mechanical strength, and low bed pressure drop. They can eliminate fluidization problems in the packed bed columns [3,5,6]. The isotherm and CO2 adsorption capacity of the MOF/MWCNT incorporated structures were compared with MOF powder
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