Photoresponsive Magnetic Molecularly Imprinted Polymers for Highly Selective Solid‐Phase Extraction and Light‐Controlled Release of Sulfamethazine

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ABSTRACT The widespread contamination of water by sulfamethazine (SMZ) poses risks to ecosystems and public health. Herein, we develop photoresponsive magnetic molecularly imprinted polymers (Fe 3 O 4 @MIPs) featuring a magnetic Fe 3 O 4 core and an azobenzene‐based functional monomer (MAPDIA). The material exhibits high selectivity for SMZ with an imprinting factor of 2.09 and a maximum adsorption capacity of 25.06 mg·g −1 . Adsorption follows the Langmuir isotherm, indicating homogeneous monolayer binding, and reaches equilibrium within 60 min. Leveraging the reversible trans – cis photoisomerization of azobenzene under alternating 365 and 440 nm irradiation, the polymer enables light‐controlled uptake and release of SMZ with good reversibility over multiple cycles. When applied as a sorbent for solid‐phase extraction from real environmental water samples, Fe 3 O 4 @MIPs provide SMZ recoveries ranging from 88.5% to 95.7%, demonstrating their potential for smart antibiotic monitoring and remediation.

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