Microporous carbon nanoflakes derived from biomass cork waste for CO2 capture

Development of Predictive Models for Activated Carbon Synthesis from Different Biomass for CO2 Adsorption Using Artificial Neural Networks

“…With the rise of KOH loading, the CO 2 adsorption capacity increased first and then decreased, and the greatest CO 2 adsorption capacities were attained at a KOH ratio of 3–4, attributed to the micropore development. Figure (code-p: 4, 8, 9, 23, 24, 26, 27 at 273 K and code-p: 1, 8, 9, 19, 23, 24, 26, 27, 33 at 298 K) shows that the CO 2 adsorption reaches up to 8 mmol/g at 273 K and 5.4 mmol/g at 298 K. Because of the growth of mesopores, we expected to reach saturation at ratios higher than 4 (Figure , code-p: 5, 7, 15, 27 at 273 K and code-p: 5, 7, 19 at 298 K). , Because the adsorption process is exothermic, the CO 2 adsorption at atmospheric pressure dropped as the adsorption temperature increased from 273 to 298 K, as shown . Low pressure (0–0.2 bar) had a substantial impact on the observed variation in CO 2 adsorption capacity at both 273 and 298 K, according to the findings.…”

“…As a result, various methods must be used to reduce greenhouse effects, acid rain formation, and climate change by capturing or separating this anthropogenic polar gas from other nonpolar gases. − The separation and capture of post-combustion CO 2 from flue gas is accomplished primarily by the use of amine solutions, solid adsorbents, and membranes. Solid sorbents are very competitive for CO 2 capture because of the advantages they have, such as high adsorption capability, low cost, ease of operation, excellent selectivity, and low environmental effects. , Up to now, a variety of solid physical adsorbents, such as mesoporous silicates, metal–organic frameworks (MOFs), carbon nanotubes (CNTs), porous polymers, metal oxyhydroxide-biochar composites, graphene, and others have been developed to substitute traditional alkanolamines in order to mitigate the drawbacks of the latter, such as corrosion, propensity for amine losses, expensive regeneration, and high energy intensity. , Activated carbon (AC) has piqued interest as a promising CO 2 adsorbent for large-scale use due to its low disposal cost, easy accessibility, thermal stability and conductivity, high specific surface area (BET), well-developed micropores and mesopores, tailored porous structure, high adsorption, and rapid regeneration due to weak interactions. − ACs are traditionally made by the pyrolysis of artificial material like titanium carbide, sodium alginate, or natural material (biomass, and cheap agricultural and forestry wastes) such as algae, celtuce leaves, and olive stones using various synthesis methods. , The choice of an appropriate precursor for pyrolysis of porous carbon is important for the final product’s porous texture, which is determined by a variety of factors, including scalability, cost, availability, non-hazardous nature, a high percentage of carbon in the precursor with low ash, and the presence of enough volatiles to produce porosity. ,,, Chemical and physical activation are the two most popular traditional approaches for activating/pyrolyzing a variety of carbonaceous biomass. , The pyrolysis of a natural precursor produces coal, which is then activated by physical (air, N 2 , O 2 , NH 3 , CO 2 , or steam) or chemical agents to generate porosity and increase the textural features of small pores (meso- and micropores). , Chemical activation can be done by acidic (ZnCl 2 , FeCl 3 , H 2 SO 4 ) or basic (KOH and NaOH) activators. , Therefore, the adsorption capacity of CO 2 is determined by factors such as carbon surface acidity–basicity, AC hydrophobicity–hydrophilicity, high BET, porosity distribution and order, isosteric heat of adsorpt...…”

Green self-activating synthesis system for porous carbons: Celery biomass wastes as a typical case for CO2 uptake with kinetic, equilibrium and thermodynamic studies

“…As shown, GC-PC has significantly higher adsorption capacities than many other adsorbents previously mentioned. The findings of this research can be used to develop a novel CO2 capture GC-PC synthesis adsorbent that is both effective and high-performing [60,[103][104][105][106][107][108][109][110][111].…”

“…12(b), for the CO2 adsorption isotherms, there is no discernible decrease in the measured CO2 uptake over ten cycles. Aside from high CO2 capture, the adsorbent's ability to be recycled is a critical requirement for practical applications implying that celery can be used as a high-performance reusable sorbent for CO2 capture applications [1,103]. One of the most important factors to consider is adsorbent reuse for economic reasons.…”

Green Self-Activating Synthesis System for Porous Carbons; Celery Biomass Wastes as a Typical Case for CO2 Uptake with Kinetic, Equilibrium and Thermodynamic Studies

“…As shown, GC-PC has significantly higher adsorption capacities than many other adsorbents previously mentioned. The findings of this research can be used to develop a novel CO2 capture GC-PC synthesis adsorbent that is both effective and high-performing [60,[103][104][105][106][107][108][109][110][111].…”