Engineering Bidirectional Cmc-Foam-Supported Hkust-1@Graphdiyne With Enhanced Heat/Mass Transfer For The Highly Efficient Adsorption And Regeneration Of Acetaldehyde

Carboxymethyl cellulose-foam-supported HKUST-1@graphdiyne (HK@GDY/CMC-B) was constructed with high thermal conductivity and directional channels to enhance the ad-/de-sorption efficiency of acetaldehyde. Characterization results showed that (1) HKUST-1 grew within CMC and GDY via an in situ tri-phase cross-linking strategy, forming a special "alkynyl vertical bar Cu vertical bar COOH" interface, which maintained the high BET surface area (945.1 m(2) g(-1)) of the HK@GDY/CMC-B foam and established a tight connection among the different components of the composite; (2) the pi-conjugated carbon structure of GDY and the unique "alkynyl vertical bar Cu vertical bar COOH" interface within HK@GDY/CMC-B accelerated the phonon conduction and significantly enhanced the thermal conductivity of HK@GDY/CMC-B (336 mW m(-1) K-1); (3) the directional channels and the hierarchical pore structure with a unique interface in the HK@GDY/CMC-B foam facilitated the diffusion and adsorption of VOCs; (4) the compact "alkynyl vertical bar Cu vertical bar COOH" interface generated more unsaturated Cu(u) and Cu(i) sites and increased adsorbent surface polarity to capture acetaldehyde. Consequently, the obtained HK@GDY/CMC-B exhibited an excellent acetaldehyde adsorption capacity of up to 11.0 mmoL g(-1), which was 1.3-3.4 times higher than that of many state-of-the-art adsorbents. Kinetics performance data revealed that the diffusivity of acetaldehyde on the HK@GDY/CMC-B foam increased by 60% compared to that of the pristine HKUST-1. Similarly, the desorption rate of HK@GDY/CMC-B was 2.2-6.5 times faster than that of several state-of-the-art adsorbents under similar temperature programmed desorption. This greatly realized an energy-conserving approach for adsorbent regeneration. Based on these findings, the current tri-phase cross-linking strategy can be deemed as an efficient tactic to further improve the adsorption efficiency of MOFs for fast adsorption of VOCs on the commercial level.