Toward Recoverable and Reusable Titanium Dioxide (TiO ₂ ) Photocatalysts

Titanium dioxide (TiO 2 ) remains a cornerstone of photocatalysis due to its chemical stability, nontoxicity, abundance, and strong oxidative capability. However, large‐scale implementation is limited by the poor recoverability and reusability of conventional nanosized TiO 2 , which suffers from aggregation, surface fouling, leaching, and structural degradation during repeated use. While prior studies have largely focused on enhancing intrinsic activity or light‐harvesting efficiency, strategies that address catalyst recovery and long‐term durability remain insufficiently explored. This article proposes a recovery‐driven design framework for TiO 2 photocatalysts, linking hierarchical structural engineering, chemical stabilization, and functional integration to enable efficient and sustained multicycle performance. We critically discuss key immobilization and confinement strategies, including the use of porous hosts, magnetic composites, thin films, and 3D monoliths, highlighting how structural design and cocatalyst stabilization govern both recoverability and reusability. Through these discussions, we outline our perspectives on future research directions involving standardized recyclability metrics, scalable fabrication routes, device integration, and artificial intelligence‐guided design with an aim to accelerate the translation of laboratory advances into durable, sustainable, and industrially deployable photocatalytic systems.