CO2 adsorption in hydrochar produced from waste biomass

Abstract

Sugar and ethanol plants produce a large amount of sugarcane bagasse. Such biomass can be the raw material for the production of an adsorbent to uptake CO 2. Thus, this work aimed to evaluate the hydrocarbonization of sugarcane bagasse and to study its use as a CO 2 adsorbent from a simulated flue gas. The temperature of the hydrothermal carbonization (HC) was set at 220 °C, while the operating time ranged from 12 to 48 h. Through the SEM-EDS analysis, the 48-h sample (HC48) was selected for chemical activation with KOH, resulting in activated hydrochar (AHC). The CO 2 and N 2 simple adsorption isotherms were obtained at 50, 70 and 80 °C. The results have shown a higher adsorption at a temperature of 50 °C for both gases. Activated hydrochar clearly preferred CO 2 instead of N 2 at 100 kPa as the maximum adsorption was 1.99 and 0.207 mmol g −1 , respectively. The highest selectivity of CO 2 /N 2 was 12-50 °C, according to the "Ideal adsorbed solution theory" model. Therefore, AHC is clearly an eco-friendly adsorbent that can be used to minimize the resulting release of climate-damaging CO 2 from flue gas to atmosphere.

Hydrothermal Carbonisation of Biomass Wastes as a Tool for Carbon Capture

“…On the other hand, by activating the hydrochars obtained in the basic environment, the CO2 sorption capacity can be increased approximately 9 times. The CO2 adsorption capacities of activated HCs is similar to that reported in other studies [23], [24].…”

Effect of Hydrothermal Carbonization Parameters and Performance of Carbon Dioxide Adsorption on Pineapple Peel Waste Biochar

“…The appropriate HTC parameters for rambutan peel biomass at 170 °C and 90 min of retention time was reported for CO 2 capture [17]. A study by Fagnani et al [18] on CO 2 adsorption using hydrochar from sugarcane bagasse biomass found that at a HTC temperature of 220 °C the optimal retention time was 48 h. Other researches [6,10,19] demonstrated that the optimal HTC parameters for CO 2 capture were strongly dependent on the type of biomass feedstock. In this study, PPW-HC showed the highest CO 2 capture at 200 °C and 2 h, with 5 °C min -1 heating rate.…”

Adsorção de azul de metileno em hidrocarvões de resíduos têxteis

“…No reator foram adicionados 3,0 g de retalhos e 80 mL de água destilada. Tal sistema foi submetido à carbonização com duração de 6, 8, 10 ou 12 horas a 220 ºC [24]. Logo após o referido processo, os hidrocarvões resultantes foram secos em estufa por 5 horas a 105 ºC.…”