Nano‐Sodalite Immobilization Enables Processable and Reusable Titanium Dioxide Photocatalysts

Water pollution from organic contaminants, such as dyes, poses significant environmental threats, highlighting the need for efficient and sustainable remediation strategies. Photocatalysis using titanium dioxide (TiO 2 ) nanoparticles is widely employed for degrading such pollutants; however, its low recoverability and limited reusability hinder large‐scale implementation. Here, we report a systematic strategy to overcome these limitations through doping of TiO 2 nanoparticles followed by in situ growth of sodalite (SOD) frameworks around the nanoparticles, in contrast to the conventional approach of depositing TiO 2 onto pre‐formed zeolites. Doping narrows TiO 2 ’s bandgap, enhancing visible‐light‐driven photocatalytic activity, while in situ growth of SOD ensures firm immobilization, preventing leaching and structural degradation. Systematic variation of (1) type and concentration of dopant, (2) TiO 2 loading, and (3) SOD crystallization parameters yields a photocatalyst that is effective irrespective of pollutant charge and retains structural integrity and catalytic performance over multiple cycles, demonstrating excellent recoverability and reusability (∼78.6% of original weight and ∼34.8% degradation efficiency after three reuse cycles). The composite also maintains high aqueous stability (zeta potential ∼−32 mV), allowing ease of processing into thin films and coatings. This integrated approach offers a scalable and sustainable platform for designing efficient and durable photocatalysts for environmental remediation.