Tetrazine-functionalized UiO-68 for highly selective Au( iii ) recovery from acidic solutions

domains and surface Au(III) and Au(I) species, directly indicating a partial reduction process driven by the electron-rich tetrazine linker, as evidenced by significant shifts in the electronic states of the nitrogen sites. These results support a cooperative "preconcentration-coordination-reduction" mechanism and demonstrate that tetrazine linker engineering in robust UiO-68 frameworks is an effective strategy for developing high-performance adsorbents for Au(III) recovery from acidic gold-containing waste streams.