Abstract
Covalent organic frameworks (COFs) are emerging crystalline polymeric materials with highly ordered intrinsic and uniform pores. Their synthesis involves reticular chemistry, which offers the freedom of choosing building precursors from a large bank with distinct geometries and functionalities. The pore sizes of COFs, as well as their geometry and functionalities, can be pre-designed, giving them an immense opportunity in various fields. In this mini-review, we will focus on the use of COFs in the removal of environmentally hazardous metal ions and chemicals through adsorption and separation. The review will introduce basic aspects of COFs and their advantages over other purification materials. Various fabrication strategies of COFs will be introduced in relation to the separation field. Finally, the challenges of COFs and their future perspectives in this field will be briefly outlined.
Highlights
Purification processes such as distillation, evaporation, concentration, and crystallization are important in basic research as well as playing an important role in industries
Covalent organic frameworks (COFs)-S-SH mercury concentration could be reduced from 5 ppm to 0.1 ppb, which is below the consumable limit of 2 ppb
Gao et al proposed that reducing the diffusion rate of an amine-bearing monomer from the aqueous to the organic phase can yield microdefects in the PA layer, which was proposed by Alan Turing many years ago (See Figure 6) [150]
Summary
Purification processes such as distillation, evaporation, concentration, and crystallization are important in basic research as well as playing an important role in industries. A class of crystalline framework material synthesized involves reticular chemistry, whichare gives immense freedom of pre-design Their pore ge- from organic building blocks. Our group has extensively worked on metal oxides and their composites for the application of photo- and electro-catalytic process [50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67], but recently co-workers prepared β-ketoenamine COFs with exceptional stability at high temperatures and in extreme acidic and basic conditions [21]. Thomas and co-workers reported triazine-based COFs prepared at 400 °C, exhibiting excellent thermo-chemical stabilities [22].
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