Nanoabsorbents manufactured by dispersing nanomaterials in liquid absorbents have attracted considerable attention from researchers and exhibit various promising applications because of their excellent heat- and mass-transfer characteristics. Therefore, many experimental and theoretical studies have been conducted recently to investigate the mass-transfer performance enhancement of nanoabsorbents in different fields. This paper reviews the mass-transfer characteristics and enhancement mechanisms of nanoabsorbents for CO₂ capture. The proposed enhancement mechanisms are discussed in terms of both absorption (bubble breaking, shuttle, and interfacial mixing effects) and regeneration (activation energy, thermal, and surface effects) processes using nanoabsorbents. The results of laboratory-scale experiments and parametrical analysis indicate that the CO₂ absorption performance of nanomaterials is maximized when they exhibit a high surface area, high thermal conductivity, small cluster size, and magnetic properties, which can be explained using the proposed theoretical models. Based on this, the following selection criteria for nanomaterials to maximize the CO₂ absorption/regeneration performance are proposed: thermophysical properties, powder/cluster size, concentration, and addition of nanoabsorbents. In the future, mass-transfer studies need to be conducted for real-life applications and should account for dispersion stability and integrated absorption/regeneration processes. Moreover, optimum geometric conditions and gas–liquid contact modes need to be achieved in the reactor for real-life applications. Finally, this paper suggests future research directions for the absorption and regeneration of CO₂ for industrial applications, including the scale-up method, numerical approach, and life cycle analysis.

通过将纳米材料分散在液体吸收剂中制造的纳米吸收剂由于其优异的传热和传质特性而吸引了研究人员的广泛关注并展现出各种有前途的应用。因此，近来进行了许多实验和理论研究以研究不同领域中纳米吸收剂的传质性能的提高。本文综述了纳米吸收剂CO ₂的传质特性及其增强机理。捕获。就使用纳米吸收剂的吸收（气泡破裂，穿梭和界面混合效应）和再生（活化能，热和表面效应）过程而言，都对所提出的增强机制进行了讨论。实验室规模的实验和参数分析结果表明，当纳米材料具有高表面积，高导热率，小团簇尺寸和磁性能时，它们对CO _2的吸收性能将达到最佳，这可以使用提出的理论模型进行解释。 。基于此，针对纳米材料最大化CO ₂的以下选择标准提出了吸收/再生性能：热物理性质，粉末/团簇尺寸，浓度和纳米吸收剂的添加。将来，需要对现实生活中的应用进行传质研究，并应考虑分散稳定性和集成的吸收/再生过程。此外，在现实生活中，需要在反应器中实现最佳几何条件和气液接触方式。最后，本文提出了工业应用中CO ₂吸收和再生的未来研究方向，包括放大方法，数值方法和生命周期分析。