Abstract
Zirconium-based metal-organic frameworks (Zr-MOFs) have great structural stability and offer great promise in the application of gas capture. However, the powder nature of MOF microcrystallines hinders their further industrial-scale applications in fluid-phase separations. Here, Zr-based DUT-68 was structured into nontoxic and eco-friendly alginate beads, and the gas capture properties were evaluated by CO2 and volatile iodine. DUT-68 beads were synthesized via a facile and versatile cross-linked polymerization of sodium alginate with calcium ions. The composite beads keep the structural integrity and most of the pore accessibility of DUT-68. The resulting DUT-68@Alginate (2:1) porous bead processes a surface area of 541 m2/g and compressive strength as high as 1.2 MPa, and the DUT-68 crystals were well-dispersed in the alginate networks without agglomeration. The DUT-68@Alginate bead with a 60% weight ratio of MOFs exhibits a high carbon dioxide capacity (1.25 mmol/g at 273 K), as well as an excellent high adsorption capacity for iodine, reaching up to 0.65 g/g at 353 K. This work provides a method to construct thiophene-contained composite beads with millimeter sizes for the capture of gases in potential industrial applications.
Highlights
The fossil oil is one of the most crucial energy sources to develop the society and sustain our lives
The DUT-68@Alginate beads were prepared based on crosslinking of alginate-Ca2+ at the room temperature
The DUT-68 powder was integrated with alginate polymers by adding the mixture of Metal-organic frameworks (MOFs) and sodium alginate solution into the CaCl2 solution dropwise
Summary
The fossil oil is one of the most crucial energy sources to develop the society and sustain our lives. Several Zr-based MOFs have been used for the capture of CO2 and iodine vapor, such as UiO-66 [1], MOF-808 [2], NU-1000 [3] These MOFs with aromatic-ring linkers usually have low adsorption capacity for CO2 due to the weak affinity because these aromatic rings and CO2. Introducing of heteroatoms, such as nitrogen, fluorine and sulfur in the rings, could enhance the polarity and basicity of frameworks, which is beneficial to increase the Lewis acid-base interactions between rings and CO2 [4,5,6]. Several functionalized linkers have been used to synthesize MOFs for CO2 adsorption [7], such as triazolyl isophthalate linkers [8], imidazolate links [9], and so on
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