Influence of Granular Bed Combination Characteristics on the Performance of PM2.5 and CO2 Synergistic Separation

In terms of construction and maintenance costs, granular bed filters offer notable advantages over existing pollutant desorption technology methods. Achieving synergistic removal of PM2.5 and CO2 through a multideck granular bed is possible by incorporating an activated carbon deck between the granular bed decks. During the experimental process, the average PM2.5 filtration efficiency exceeds 95%, while the average CO2 adsorption efficiency surpasses 80%. Substituting activated carbon for one or more decks within the multideck bed during the synergistic removal process offers the dual benefit: (1) preventing PM2.5 from interfering with CO2 adsorption by the activated carbon; (2) the internal pore specific surface area advantage of the activated carbon bed can also provide an auxiliary adsorption effect when filtering PM2.5. In addition, the granular bed showed a good synergistic regeneration performance. Consequently, this study introduces a new technological approach for the synergistic separation of PM2.5 and CO2, which informs the application of particulate bed filtration for the synergistic uptake of multiple pollutants.