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Synthesis and Photocatalytic Performance of Manganese-Based Nanocomposites for the Degradation of Imidacloprid Under UV Light
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DOI：10.1002/slct.73204.png)
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Abstract
En 中文
The extensive use of the neonicotinoid pesticide imidacloprid poses serious environmental concerns due to its persistence and toxicity in aquatic-systems. This study reports the photocatalytic degradation of commercially available Confidor (17% imidacloprid) under UV irradiation using a Dy(0.15)Mo(0.15)@MnFe2O4 nanocomposite. The photocatalyst was synthesized via the coprecipitation-method followed by calcination. and characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM)-EDX, UV-visible, photoluminescence (PL), and transient photoluminescence (TRPL) analyses. XRD confirmed the formation of a cubic-spinel-structure, while SEM images revealed uniform, spherical-nanoparticles of approximately 66 nm. The MnFe2O4 provides magnetic and structural-stability, whereas the Dy-Mo enhances light absorption, charge separation, and surface reactivity. The reduced long-lived lifetime (0.81 ns) and average lifetime (219 ns) of DyMo@MnFe2O4 are attributed to the rapid charge-transfer between heterojunction and suppressed recombination due to the Dy and Mo doping in MnFe2O4. Photocatalytic-degradation reached 87% within 60 min at a pH of 9, with an apparent rate constant (k app) of 0.031 min-1, following Langmuir-Hinshelwood kinetics (K = 0.018 mM-1; kappa = 2.5 mM min-1; R 2 = 0.991). A 75% reduction in total organic carbon confirmed effective mineralization, and the catalyst retained similar to 74% activity after five reuse cycles, demonstrating high stability. These findings confirm DyMo@MnFe2O4 as an efficient and reusable photocatalyst for pesticide degradation in water.
Keywords:
co-precipitation
environmental contamination
imidacloprid
photocatalytic degradation
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