Sustainable 3D-Printed Supports Coated with Zirconium-Based Metal-Organic Frameworks for Picolinic Herbicide...

Metal-organic frameworks (MOFs) offer outstanding potential for pollutant extraction; however, their practical use is often hindered by difficulties in handling and recovery. Herein, we report a sustainable MOF-based extraction platform that integrates 3D-printed supports fabricated from poly-(lactic acid) and pine wood residues with zirconium-based MOFs grown via a green in situ synthesis. Postprinting surface functionalization enabled the stable immobilization of UiO-66-derived MOFs, selected for their strong affinity toward picolinic herbicides (PHs). The resulting UiO-66-OH@3D-printed device demonstrated high extraction efficiencies (73-107%), excellent sensitivity (limits of detection of 0.0016-0.0032 μg L^-1), and good reusability over eight extraction cycles. The platform was successfully applied to the determination of trace PHs in environmental water samples. This work establishes MOF-functionalized sustainable 3D-printed devices as a robust, cost-effective, and environmentally benign strategy for green water pollutant extraction.