ABSTRACT Amino‐functionalized copper triazolate metal–organic frameworks (MOFs), CuTz‐1NH 2 ‐a and CuTz‐1NH 2 ‐b, were successfully synthesized by doping the asymmetric triazole ligand 3‐amino‐1, 2, 4‐triazole (3‐NH 2 ‐tzH) into the reactant mixture of CuTz‐1 at room temperature. Comprehensive characterization using PXRD, FT‐IR, 1 H‐NMR, SEM, TEM, XPS, BET, and EA confirmed the successful incorporation of 3‐NH 2 ‐tzH at doping levels of 11% and 23%, respectively, while preserving the framework topology. Remarkably, CuTz‐1NH 2 ‐b achieved maximum adsorption capacities of 220. 4 mg·g −1 for diclofenac sodium (DCF) and 119. 0 mg·g −1 for sulfasalazine (SSZ) at 303 K — 4. 26 times and 2. 37 times the respective capacities of the parent CuTz‐1. Especially, the adsorption of SSZ over CuTz‐1NH 2 ‐b ranks among most reported adsorbents as far as we know. Mechanistic studies attribute the superior adsorption performance to synergistic factors: an elevated isoelectric point arising from amino functionalization (favorable at pH ≤ 7), anionic exchange between BF 4 − and DCF − /SSZ x−, hydrogen bonding involving amino groups, and potential Cu (II) ─O coordination. Furthermore, CuTz‐1NH 2 ‐b demonstrated excellent reusability over four consecutive cycles with maintained structural integrity. This work offers valuable insights into the rational design of MOF‐based adsorbents through targeted functional group incorporation for enhanced removal of emerging contaminants.
Lv et al. (Sun,) studied this question.