Huazhong Agricultural University has made new progress in pesticide residue removal and disease green prevention and control in paddy fields
By: Date: 2022-07-03 Categories: foodtechnology Tags: ,
Recently, the research results of the pesticide toxicology team of the school of plant science and technology of Huazhong Agricultural University were”magnetic mxene Ba”sed metal organic fFrameworks composites:synthesis, characterization and application”Published on national chemical engineering. This study synthesized a kind of fungus that can inhibit rice blast (Magnaporthe grisea barr.) Magnetic MOF composites can also adsorb and remove pesticide residues in rice fields.
Researchers combined two-dimensional inorganic compound mxene and metal organic skeleton zn-mof-74 to synthesize a multifunctional magnetic composite with adsorption and antibacterial capabilities [email protected] @MOF-74。 Through FT-IR, TEM, SEM, XRD, VSM, bet, TG and a series of characterization analysis, it is confirmed that the material has a stable chemical structure, the surface is rich in a large number of functional groups, and can be quickly dispersed in the water environment. Based on this material, a method for removing multiple residues of triazole fungicides in the paddy ecosystem was established. In the spiked experiment of paddy water samples from three provinces and cities, the removal efficiency of the target fungicides was more than 90%. The reusability experiment confirmed that the material can still maintain a stable structure and still have a high removal rate of the target fungicide after five consecutive adsorption desorption cycles. In addition, in the study of the biological activity of the composite material, it was found that the material showed obvious inhibitory effect on Magnaporthe grisea, indicating that the material has good potential for the control of common diseases in rice fields. This study is of great significance for the purification and removal of pesticide residues in paddy ecosystem and the development of multifunctional adsorbents.
Luzhiheng, a graduate student of the College of plant science and technology, is the first author of the paper, Associate Professor Yang Zhonghua is the corresponding author, and tianqin, a professor level senior engineer of the National Geological Experiment and testing center, also participated in the study. The research was supported by the national key R & D Program (2019yfd1002103), the National Natural Science Foundation of China (21507032), the natural science foundation of Hubei Province (2020cfb528) and the special fund for China’s agricultural research system (cars-31-31).
[English Abstract]
  Triazole fungicides are the most frequently used in preventing and controlling rice blast due to their high efficacy, broad spectrum and long effective duration. However, serious environmental problems might be posed by these agricultural chemical’s residues. In this work, a novel magnetic composite ( [email protected] @MOF-74) was synthesized by a facile strategy and applied to remove triazole fungicides. Specifically, the morphology and property of this prepared material was analyzed by a series of characterizations. The adsorption performances were systematically investigated, and the maximum adsorption capacity towards epoxiconazole and tebuconazole were 120.96 and 108.26 mg g? 1, respectively. The adsorption process could be described by pseudo-second-order kinetic model and Langmuir isotherm model, and the adsorption mechanism was predominantly determined by hydrogen bonding, covalent bonding and π-π stacking, along with electrostatic and physical interaction. In actual application, the satisfactory removal performances were obtained in paddy field water samples. Finally, it is worth mentioning that [email protected] @MOF-74 was proved to have antibacterial activity, and the effective concentration for 50%inhibition (EC50) value against mycelium growth of Magnaporthe grisea Barr. was 0.70 g L? 1. Consequently, bi-functional properties of excellent adsorption performance and antibacterial activity make [email protected] @MOF-74 a great potential in paddy field applications.
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