PVC supported MgLa-LDH composite film for phosphorus recovery in open aquatic environments

Effective phosphorus recovery in natural aquatic ecosystems necessitates the integration of phosphorus adsorbents with appropriate carrier materials to develop functional devices, thereby addressing the challenge of water eutrophication. In this study, we report for the first time that MgLa layered double hydroxide powder was anchored in situ on polyvinyl chloride substrates (PVC@MgLa-LDH) by solvent exchange method, resulting in the formation of composite films with hydrophilic, lightweight and flexible characteristics. Within a phosphorus solution of 100 mg P /L, the adsorption capacity achieved an impressive 66.5 mg P /g, alongside commendable reusability. Notably, comparative assessments revealed that the adsorption sites of MgLa-LDH slightly affected by the PVC substrate. Given their favorable transport and recovery attributes, PVC@MgLa-LDH composite films show significant potential for application in phosphorus recovery initiatives in open aquatic environments. Additionally, this fabrication method offers a promising framework for the development of customized adsorption films targeting various pollutants.