Pyridine-N-Anchored Ag Strategy Facilitated Br^- Adsorption via Ultrahigh Exposure and Coordination Unsaturation of Ag.

Abstract

Traditional adsorbents using silver nanoparticles demonstrated exceptional adsorption capacities for Br^-. However, the majority of the adsorption sites in silver nanoparticles are situated on their surfaces, limiting the interaction of internal atoms with Br^-. Therefore, we synthesized Ag/UiO-bpy MOF by utilizing the two pyridine nitrogen atoms in the ligand to anchor silver. So each silver atom was effectively exposed. Besides, owing to the coordinatively unsaturated state of the silver atoms, they exhibited a stronger adsorption affinity for Br^-. As a result, Ag/UiO-bpy demonstrated an exceptional Br^- adsorption capacity of 362.6 mg/g. Notably, the adsorption capacity with respect to silver was 2083.9 mg/g_Ag, which surpasses all previously reported values in the literature. Furthermore, Ag/UiO-bpy exhibited rapid kinetics and exceptional selectivity in Br^- adsorption experiments. This work not only fabricated a Br^- adsorbent with a high adsorption capacity but also proposed a new and innovative strategy for the subsequent preparation of Br^- adsorbents.