Abstract
The incorporation of functional building blocks to construct functionalized and highly porous covalent triazine frameworks (CTFs) is essential to the emerging adsorptive-involved field. Herein, a series of amide functionalized CTFs (CTF-PO71) have been synthesized using a bottom-up strategy in which pigment PO71 with an amide group is employed as a monomer under ionothermal conditions with ZnCl2 as the solvent and catalyst. The pore structure can be controlled by the amount of ZnCl2 to monomer ratio. Benefitting from the highly porous structure and amide functionalities, CTF-PO71, as a sulfur cathode host, simultaneously demonstrates physical confinement and chemical anchoring of sulfur species, thus leading to superior capacity, cycling stability, and rate capability in comparison to unfunctionalized CTF. Meanwhile, as an adsorbent of organic dye molecules, CTF-PO71 was demonstrated to exhibit strong chemical interactions with dye molecules, facilitating adsorption kinetics and thereby promoting the adsorption rate and capacity. Furthermore, the dynamic adsorption experiments of organic dyes from solutions showed selectivity/priority of CTF-PO71s for specific dye molecules.
Highlights
Porous Organic Frameworks (POFs) possess unique structural features, such as open and permanent porosity, high surface area, and flexible molecular design of pore structures and functionalities
We studied the contribution of pore structure and amide-based functionalities of covalent triazine frameworks (CTFs) to adsorption-based applications by applying the CTF-PO71 as a sulfur cathode host for Li-S batteries and as an adsorbent for aqueous organic dye molecule removal and selective adsorption
On the basis of the obtained results, we have discussed the effect of physical capture provided by nanopores and the chemical interaction attributed to the amide groups, and we have made a comparison of the properties with unfunctionalized CTF materials (Kuhn et al, 2008) toward those applications, establishing the coordination of pore structure and functional active sites on the performance of the capture-based process
Summary
Porous Organic Frameworks (POFs) possess unique structural features, such as open and permanent porosity, high surface area, and flexible molecular design of pore structures and functionalities. POF-based adsorbents possess high surface areas and tailored pore sizes for physical adsorption and show flexible molecular designs with targeted functionalities to trigger a stronger chemical interaction with dye molecules, thereby promoting the adsorption performance. We studied the contribution of pore structure and amide-based functionalities of CTFs to adsorption-based applications by applying the CTF-PO71 as a sulfur cathode host for Li-S batteries and as an adsorbent for aqueous organic dye molecule removal and selective adsorption. On the basis of the obtained results, we have discussed the effect of physical capture provided by nanopores and the chemical interaction attributed to the amide groups, and we have made a comparison of the properties with unfunctionalized CTF materials (Kuhn et al, 2008) (abbreviated as CTF in the following) toward those applications, establishing the coordination of pore structure and functional active sites on the performance of the capture-based process
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