Low-cost carbonaceous adsorbents with microporous structures and a moderate specific surface area (up to 1630 m² g⁻¹) were prepared from different amazonian nutshells by one-step chemical activation with KOH for CO₂ storage. In-depth micropore structure analysis and surface characterization were performed using adsorption isotherms at 298 K and carbon dioxide isotherms at 273 K. The Brazilian nutshell and Cascara Capuassau exhibit a remarkable CO₂ uptake capacity of 5.14 mmol g⁻¹ and 5.13 mmol g⁻¹ at 273 K, respectively up to 1 atm. The highest CO₂ adsorption at 298 K equal to 3.67 mmol g⁻¹ was observed on activated carbon produced from Cascara Capuassau. The low-pressure CO₂ capacities are well correlated with the volume of small micropores (<0.7 nm) rather than the total micropore volume and surface area. The great mesoporosity of activated carbons is beneficial to ensure higher CO₂ capture at high uptake pressure.

通过使用KOH一步化学活化CO ₂储存，由不同的亚马逊坚果壳制备了具有微孔结构和中等比表面积（高达1630 m ²  g ^-1）的低成本碳质吸附剂。使用298 K的吸附等温线和273 K的二氧化碳等温线进行了深入的微孔结构分析和表面表征。巴西坚果壳和Cascara Capuassau的CO ₂吸收能力分别为5.14 mmol g ^-1和5.13 mmol g ^-1在273 K下分别达到1 atm。298 K时最高的CO ₂吸附量等于3.67 mmol g ^-1在由卡斯卡拉·卡普阿索（Cascara Capuassau）产生的活性炭上观察到。低压CO _2的容量与小微孔（<0.7 nm）的体积而不是总微孔的体积和表面积密切相关。活性炭的大介孔率有利于确保在高吸收压力下捕获更高的CO ₂。