There is an urgent need to address sulfur dioxide (SO 2 ) from the burning of fossil fuels, which poses a serious hazard to the surrounding environment due to its emission. In this work, UiO-66-type metal–organic framework materials (MOFs) were prepared by hydrothermal method and applied to flue gas desulfurization. Through characterization analysis, it was found that UiO-66 sample had high crystallinity and good thermal stability. Besides, UiO-66 sample had a large specific surface area (1423 m 2 /g) and a large pore volume (0.69 cm 3 /g). In the desulfurization experiments of SO 2 /CO 2 /O 2 /N 2 gas mixture (0.3/10.0/5.5/84.2 vol.%), UiO-66 had a breakthrough time of 137.6 min/g for SO 2 , the high selectivity of SO 2 /CO 2 (36.0), and strong acid resistance. Besides, the adsorption thermodynamic analysis can confirm that the adsorption process of UiO-66 for SO 2 was a combination of physical adsorption and chemical adsorption. At 1.0 bar and 298 K, the adsorption capacity of SO 2 on UiO-66 reached 8.12 mmol/g.
The preparation of mixed matrix membranes (MMMs) using metal–organic framework (MOF) as fillers is one of the simple and effective methods to improve the gas permeability and selectivity of membranes, and it has an attractive prospect to achieve controllable gas separation process. Herein, NH 2 -MIL-53 nanoparticles are synthesized by hydrothermal method and modified by aminoazobenzene (Azo) by decompression loading technology. The multifunctional Azo@NH 2 -MIL-53 nanoparticles are incorporated into the Pebax matrix to fabricate MMMs for efficient and controllable SO 2 separation. Pebax/Azo@NH 2 -MIL-53–20% membrane exhibits the maximum SO 2 permeability of 2570 Barrer with a SO 2 /N 2 selectivity of 717 and the separation process of SO 2 /N 2 has dynamic photo-responsive characteristics under different light conditions, which is attributed to the incorporation of the Azo@NH 2 -MIL-53. First, the NH 2 -MIL-53 nanoparticles with high specific surface area of 637 m 2 .g −1 and pore size of 1.50 nm are introduced into MMMs to construct rich SO 2 transport channels, increasing the diffusivity selectivity. Second, the inherent –NH 2 groups and introduced -N = N- groups in Azo@NH 2 -MIL-53 increase the affinity of SO 2 , enhancing the solubility selectivity. Third, by artificially changing the light conditions to accurately control the conformation of Azo and the pore structure of NH 2 -MIL-53 is changed, which significantly changes the SO 2 adsorption capacity of NH 2 -MIL-53. Due to light is available in abundance in the form of sunlight, the mixed matrix membrane coupled with photo-responsive MOF can achieve more efficient and energy-saving gas separation process.
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