Direct air capture (DAC) is a promising technology for decarbonization through the removal of CO₂ from the atmosphere. In many DAC processes, the regeneration energy used to restore the capture capacity of sorbents accounts for a significant fraction of the energy required by the whole process. Here we report an effective and scalable sorbent regeneration method for liquid DAC solvents based on magnetic nanoparticles (MNPs) heating with AC magnetic fields. MNPs can be directly heated to provide uniform and rapid volumetric heating, as we demonstrate by promoting the release of captured CO₂ from an aqueous solution of potassium sarcosinate. Our results showed that 90% of the solvent can be regenerated within 7.5 min of heating through proposed technique. The MNPs and solvent are found to be stable during the regeneration process and the MNPs showed long-term stability in the CO₂-saturated solvent. Cyclic experiments showed that the nanoparticles can be reused for multiple cycles without performance deterioration. The process is operated in a noncontact mode through electromagnetic waves, making it an adoptable approach for existing carbon capture systems. The MNPs heating provides an effective regeneration strategy for liquid solvents used in carbon capture processes, in particular for DAC.

中文翻译：

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磁性纳米颗粒诱导吸附剂再生用于直接空气捕获


直接空气捕获（DAC）是一种通过去除大气中的CO ₂实现脱碳的有前途的技术。在许多DAC过程中，用于恢复吸附剂捕获能力的再生能量占整个过程所需能量的很大一部分。在这里，我们报告了一种有效且可扩展的液体 DAC 溶剂吸附剂再生方法，该方法基于交流磁场下的磁性纳米颗粒 (MNP) 加热。 MNP 可以直接加热以提供均匀且快速的体积加热，正如我们通过促进从肌氨酸钾水溶液中释放捕获的 CO ₂所证明的那样。我们的结果表明，通过所提出的技术，90% 的溶剂可以在加热 7.5 分钟内再生。发现MNP和溶剂在再生过程中是稳定的，并且MNP在CO ₂饱和溶剂中表现出长期稳定性。循环实验表明，纳米颗粒可以多次循环重复使用，性能不会恶化。该过程通过电磁波以非接触模式运行，使其成为现有碳捕获系统可采用的方法。 MNP 加热为碳捕获过程中使用的液体溶剂（特别是 DAC）提供了有效的再生策略。