Metal‐Organic Frameworks for Dual Photo‐Oxidation and Capture of Arsenic from Water

Abstract Despite rapid technological progress, heavy metal water pollution, and particularly arsenic contamination, remains a significant global challenge. In addition, the stabilization of trivalent arsenic as neutral arsenite (As III ) species hinders its removal by conventional sorbents. While adsorption of anionic arsenate (As V ) species is in principle more feasible, there are only few adsorbents capable of adsorbing both forms of arsenic. In this work, we explore the potential of two well‐known families of Metal‐Organic Frameworks (MOFs), UiO‐66 and MIL‐125, to simultaneously adsorb and photo‐oxidize arsenic species from water. Our results demonstrate that the formation of As V ions upon light irradiation promotes the subsequent adsorption of As III species. Thus, we propose the combined utilization of photocatalysis and adsorption with Metal‐Organic Framework photocatalysts for water remediation purposes.