Rational design of a magnetic S-scheme MnFe2O4/Ce-MOF heterojunction for efficient solar-driven pesticide mineralization in wastewater

초록

Efficient water treatment is vital to counter deltamethrin (DM), a persistent agricultural insecticide that threatens ecosystems. MnFe2O4 (MFO) nanoparticles and a Ce-based MOF are synthesized and integrated via an in-situ hydrothermal method to form an MFO/Ce-MOF heterojunction nanocomposite. Their structural and physicochemical properties are characterized using multiple techniques. The photocatalytic performance of the materials has been evaluated by degrading DM under direct sunlight. Under optimized conditions, MFO/Ce-MOF achieves 94% DM degradation within 150 min alongside concomitant reduction in COD (74%) and TOC (65%). GC-MS identifies intermediates, while electrochemical and radical trapping verify the S-scheme mechanism. Toxicity assays show that the detoxified effluent has no antibacterial activity against E. coli. Recycling tests demonstrate excellent stability with minimal activity loss. These findings highlight the MFO/Ce-MOF nanocomposite as a durable and sustainable photocatalyst for the solar-driven remediation of pesticide-contaminated wastewater.

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