Ultra-Efficient and Selective Gold Separation via Second-Sphere Coordination of Aurous Dihalide Using a Nonporous Amorphous Superadsorbent.

ABSTRACT: The escalating demand for gold, coupled with dwindling terrestrial reserves, underscores the urgent need for innovative separation strategies, including e-waste recycling and seawater extraction. However, the development of ultra-efficient, highly selective adsorbents capable of recovering trace amounts of gold from complex aquatic matrices remains a formidable challenge. Herein, a covalent organic superphane cage is reported as a nonporous amorphous superadsorbent (NAS) for selective and efficient gold recovery via intermolecular second-sphere coordination of AuBr₂⁻ (or AuCl₂⁻) ions, subsequently converted to metallic gold through disproportionation. NAS demonstrates outstanding performance, including an exceptional gold uptake capacity of 2750 mg g⁻¹, ultrafast adsorption kinetics (40 s)

SUBMITTER: Zhou W 

PROVIDER: S-EPMC12021077 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature