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Abstract In consideration of increasingly serious environmental issues, and concern for the environmental impact by heavy metals, materials have been developing to act as adsorbents with high capacity and selectivity… Click to show full abstract
Abstract In consideration of increasingly serious environmental issues, and concern for the environmental impact by heavy metals, materials have been developing to act as adsorbents with high capacity and selectivity for metal ions in the environment. Covalent organic frameworks (COFs) are potential materials for addressing these environmental challenges as their molecular skeletons can be aimed at particular application by predesigned affine functional groups. Here, two COFs namely COF1 and COF2 with different hydroxyl group distributions were successfully synthesized from 1,3,5-triaminobenzene (TAB) and 2,3-dihydroxyterephthalaldehyde (2,3-Dha) or 2,5-dihydroxyterephthalaldehyde (2,5-Dha), respectively. COF2 exhibited a high adsorption capacity of 649.35 mg g−1 for Cr(VI) in water, performing better than COF1 and most of previously reported adsorbents. COF1, however, performed better than COF2 at a low Cr(VI) concentration (
Journal Title: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Year Published: 2020
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