Adsorptive capture of perrhenate (ReO4−) from simulated wastewater by cationic 2D-MOF BUC-17

Abstract Water-stable [Co3(tib)2(H2O)12](SO4)3 (BUC-17) was hydrothermally synthesized by adding formic acid as a modulator. The as-prepared BUC-17, whose zeta potentials were positive in pH 4.0–10.0, was used as potential adsorbent to capture ReO4− ions. The corresponding kinetics behavior and equilibrium isotherm fitted well to the pseudo-second-order and Langmuir model, in which the maximum sorption capacity of BUC-17 was 401.9 mg ReO4− g−1 sorbent at 298 K. Additionally, BUC-17 demonstrated outstanding removal activity in wide range of pH (4.0 – 10.0) and high salinity. The fixed-bed column packed with BUC-17 powder could continuously eliminate ReO4− solution, which provided the possibility to accomplish potentially large-scale application. At last, the adsorption mechanism was proposed, which was the synergism of electrostatic interactions and ion exchange between SO42− and ReO4−.