Stevia residue as new precursor of CO2-activated carbon: Optimization of preparation condition and adsorption study of triclosan

Synergistic Effect of Nitrogen Doping and Ultra-Microporosity on the Performance of Biomass and Microalgae-Derived Activated Carbons for CO2 Capture

“…After the chemical and physical activation, broader bands ranging from 2800 to 3300 cm –1 are visible, signifying an O–H stretching vibration in hydrochars, which weakened in both non-N-doped and N-doped activated carbon samples . The peaks at 2320, 2100, and 2000 cm –1 in the activated samples correspond to the presence of carboxylic groups due to the utilization of CO 2 as an oxidant during the activation process . Additionally, peaks located at 2850 and 2970 cm –1 in hydrochar samples due to the asymmetric C–H vibrations of alkyl groups disappeared or weakened in activated carbons, demonstrating the significant elimination of −CH 3 groups and aromatization during the activation procedure.…”

“…34 The peaks at 2320, 2100, and 2000 cm −1 in the activated samples correspond to the presence of carboxylic groups due to the utilization of CO 2 as an oxidant during the activation process. 59 Additionally, peaks located at 2850 and 2970 cm −1 in hydrochar samples due to the asymmetric C−H vibrations of alkyl groups disappeared or weakened in activated carbons, demonstrating the significant elimination of −CH 3 groups and aromatization during the activation procedure. As evidenced by the range of observed peaks (the peaks at 3440− 3600 and 1674 cm −1 related to the N−H stretching vibration and NH 2 bending vibration, and the bands at 1178 and 1250 cm −1 attributed to the C−N stretching vibrations), nitrogen functional groups were preserved in the AC-180-4-1 sample after the activation procedure 7 (Figure 3C).…”

Characteristics and performance analysis of different grain sizes bamboo-activated carbons for motorcycle flue gas adsorption

“…Therefore, studies have commenced investigation using alternative precursors such as biomass. Various studies described the use of biomass activated carbons for CO 2 adsorption before-mentioned as from sewage sludge [17], stevia residue [18], rice husk char [19], sugarcane bagasse [5], date palm tree [20], chestnut shell, walnut shell, and macadamia shell [21].…”

An Evaluation of the Impact of the Amount of Potassium Hydroxide on the Porous Structure Development of Activated Carbons

“…This raises the very necessary question of their characterization and preparation conditions [24]. Indeed, the final porous texture of activated carbons is dependent not only on the starting precursor, which can be any organic matter-especially biomass [25][26][27][28][29], but also, and above all, on its conditions of transformation into activated carbon [30][31][32][33][34][35]. This process can be carried out in different ways, but always leads to an enrichment of the starting organic matter into carbon (the carbonization stage), and to the opening and development of porosity in the final material (the activation stage).…”