Mn-1,4-BDC MOF based a COF for ultrafast and simultaneous removal of cationic dyes

Abstract

We utilized the benefits of two promising classes of porous hybrid materials via the combination of Mn-1,4-benzenedicarboxylate (Mn-1,4-BDC) metal–organic framework (MOF) and imine-linked melamine and terephthaldehyde covalent organic framework (COF) using the solvothermal method. The resultant hybrid material (Mn-1,4-BDC/COF) was analyzed by variant methodology inclusive of FT-IR, XRD, FE-SEM, STA, and BET. The synthesized Mn-1,4-BDC/COF was used as a robust adsorbent to quick simultaneous removal of auramine O (AO) and rhodamine B (RB) via hydrogen bonding, electrostatic communication, π-π piling and Lewis acid-base association from aqueous media. The effective operational variables which include pH, Mn-1,4-BDC/COF mass, sonication time, and initial dyes concentration were cross-examined and optimized. The optimum conditions were found to be at pH = 8, 0.016 g Mn-1,4-BDC/COF dosage, and 8 min sonication time. Mn-1,4-BDC/COF adsorbent exhibited the adsorption capacity of 21.53 and 25.13 mg/g for AO and RB, respectively. The isotherm and kinetic studies reveal a suitable fit for the Langmuir isotherm and the pseudo-second-order kinetics models, respectively.