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High efficiency of toluene Ad-/Desorption on Thermal-conductive HKUST-1@BN nanosheets composite

2023; Elsevier BV; Volume: 465; Linguagem: Inglês

10.1016/j.cej.2023.142791

1873-3212

Sheng Li, Sidra Subhan, Liqin Zhou, Jing Li, Zhongxing Zhao, Zhenxia Zhao,

Gas Sensing Nanomaterials and Sensors

Improving the adsorption capacity of the volatile organic compounds (VOCs) will inevitably decrease the desorption efficiency and hence increase more energy-consumption, which has become a crucial challenging problem for MOFs modification and composition toward VOCs adsorption. Herein, a thermal-conductive composition strategy was proposed to anchor BN nanosheets (BNNS) into HKUST-1 crystals via “N/O-Cu-O” interface. The formed HKUST-1@BNNS composite maintained high surface area (1633.7 m2/g having more microporous) and enhanced heat diffusivity (1.8 times of HKUST-1), simultaneously. This enabled significant increase of toluene adsorption capacity on HKUST-1@BNNS up to 4.3 mmol/g (2.8 times of HKUST-1) at ultra-low pressure (P/P0 ≈ 0.001) and higher desorption rate of toluene (kds = 29.3 × 10−2, 4.0 times of HKUST-1) with lower desorption activation energy (Ed = 33.5 kJ/mol). Compared with many other state-of-the-art adsorbents (e.g., MOFs, zeolites and activated carbons), it has a much higher adsorption capacity and regeneration rate. Thus, thermal-conductive MOFs construction can be deemed as smart strategy to enhance adsorption efficiency and save desorption energy for VOCs capture.