A thienyl‐benzodithiophene‐based two‐dimensional conjugated covalent organic framework for fast photothermal conversion

Abstract

Two‐dimensional conjugated covalent organic frameworks (2D c‐COFs) are emerging semiconductor materials for optoelectronic and photothermal applications. In particular, the highly tailorable, semiconducting thiophene‐based 2D c‐COFs have attracted considerable interest due to their nontrivial physicochemical properties such as photo‐activity, broad optical absorption, tunable electronic structures, and so forth. Herein, we demonstrate a novel, crystalline 2D c‐COF based on thienyl‐functionalized benzodithiophene (BDT) and biphenyl (BP) via the Schiff‐base polycondensation reaction. The resultant BDT‐BP‐COF exhibits a broad optical absorption up to ca. 600 nm and decent π‐conjugation along the 2D polymer skeleton, as revealed by the optical absorption and theoretical calculations. The favorable π‐conjugation and the abundant electron‐rich thiophene units confer excellent photo‐activity to BDT‐BP‐COF towards the usage of solar energy. As a proof‐of‐concept application, we explore BDT‐BP‐COF in photothermal conversion, in which it shows a fast surface‐temperature increase upon light irradiation for seconds.

Adsorption kinetics, isotherms and mechanisms of three‐component covalent organic polymer/sodium alginate beads for ciprofloxacin removal from aqueous solution

“…Covalent organic frameworks (COFs) and covalent organic polymers (COPs), which bare large specific surface area, abundant porosity, high chemical stability and adjustable functionality, have exuded a unique charm in extensive fields of energy, medicine and environment, to name but a few. [8][9][10][11] Remarkably, COF/COP species based on Schiff base reaction as efficient adsorbents for removing pollutants from water has caught on prevalently. 12,13 However, the development of excellent COF/COP-based adsorbents is rather restricted by the monotonous monomers, limited condensation reactions and difficult synthesis procedures.…”