Facile synthesis and characterization of magnetic nanocomposite ZnO/CoFe2O4 hetero-structure for rapid photocatalytic degradation of imidacloprid

Abstract

This work has attempted to investigate the potential of ZnO/CoFe2O4 magnetic nanocomposite to mineralize imidacloprid completely to have sustainable pollutant free and safe water supply. The co-precipitation method was performed to prepare the composites; was performed to characterize composites, scanning electron microscope (SEM), transmission electron microscopy (TEM), energy dispersive x-ray crystallography (EDX), x-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and vibrating sample magnetometer (VSM). It was attempted to explore and enhance parameters influencing the process and the percentage of imidacloprid degradation, including photocatalyst amount, pesticide concentration, pH, radiation time, and temperature. UV-Vis spectrophotometer was used for the degradation percent of organochlorine pesticides. Parameters affecting the process, including photocatalyst amount, pesticide concentration, pH, radiation time, and temperature effect on the percentage of imidacloprid degradation were Investigated and optimized. 0.05 g of photocatalyst, with a concentration of 5 ppm for 45 min under light exposure was obtained at pH 10 at room temperature.

New Formulation to Accelerate the Degradation of Pesticide Residues: Composite Nanoparticles of Imidacloprid and 24-Epibrassinolide

“…The characteristic diffraction peaks of IMI and 24-EBL were not observed in the nanoparticles, which might indicate that IMI and 24-EBL existed as amorphous structures after interaction with the wall material. 36 , 38 The crystal size of the composite nanoparticles calculated from the Scherrer equation using the highest peak point (19.56°) was 0.38 nm.…”

Preparation of BiVO4/RGO‐TNT Nanomaterials for Efficient and Recyclable Photocatalysis of Imidacloprid Insecticide

“…Figure 4(A) showed that pH had a significant impact on photocatalytic activity, and the photodegradation efficiencies of imidacloprid were 37 %, 38 %, 30 %, 40 % and 73 %, corresponding to pH 2.0, 4.0, 6.0, 8.0 and 10.0, respectively. That meant that alkaline condition was suitable for catalytic removal of imidacloprid, which attributed to the presence of a large number of hydroxyl radicals (⋅OH) that were powerful oxidants, [55,56] and thus increased degradation efficiency of pesticide molecules. At higher pH, the presence of a large amount of hydroxyl groups had a negative charges on the surface of the catalyst, which facilitated the migration of holes from inside the catalyst to the surface.…”

“…large number of hydroxyl radicals ( * OH) that were powerful oxidants, [55,56] and thus increased degradation efficiency of pesticide molecules. At higher pH, the presence of a large amount of hydroxyl groups had a negative charges on the surface of the catalyst, which facilitated the migration of holes from inside the catalyst to the surface.…”

Insights into the Toxicity and Degradation Mechanisms of Imidacloprid Via Physicochemical and Microbial Approaches

“…The catalytic activity of a semiconductor is affected by various parameters, such as crystal surface area, band gap, crystallinity, impurity, and density of surface hydroxyl. At room temperature and a pH of 10, the photocatalyst ZnO/CoFe 2 O 4 magnetic nanocomposite at 0.05 g can completely degrade imidacloprid at 5 mg•L −1 by illumination for 45 min [74]. Metal-organic frameworks (MOFs) are mixed porous coordination polymers assembled by forming strong bridging bonds between organic ligands and metal ions.…”