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用十二烷基磺酸钠对纳米TiO2/Ag光催化剂表面进行了修饰,研究了改性前后催化剂对烯酰吗啉的吸附行为.以TiO2/Ag,SDS改性TiO2/Ag,TiO2和空白为光催化载体,农药烯酰吗啉为有效成分, 制备了4种模拟的水基性农药制剂,将其直接涂膜于玻璃片上,于太阳光下进行光降解实验.当制剂中烯酰吗啉含量为1.2%,太阳光降解5 d,烯酰吗啉降解率分别为71.5%,68.0%,45.5%和28.3%.用小白菜做作物残留毒性试验,用烯酰吗啉含量为10%的纳米制剂稀释后喷洒于作物上,在太阳光下降解8 d 后,其中农药分解率达97.3%,半衰期为2.80 d.纳米农药制剂具有较高的生物活性,在相同条件下其毒力是原药毒力的1.235倍,是乳油制剂毒力的1.245倍.
The surface of nanometer TiO2 / Ag photocatalyst was modified with sodium dodecyl sulfate, and the adsorption behavior of dimethoxymethylmorpholine before and after the modification was studied.The TiO2 / Ag, TiO2 and blank For the photocatalytic carrier, the pesticide dimethomorph as the active ingredient, prepared four kinds of simulated water-based pesticide formulations, which were directly coated on glass, photodegradation experiments in the sun.When the formulation enoyl The content of morpholine was 1.2% and the degradation of sunlight was 5 days, the degradation rates of dimethomorph were 71.5%, 68.0%, 45.5% and 28.3% Of the nano-formulations diluted sprayed on the crops, after 8 days of degradation in the sun, which pesticide decomposition rate of 97.3%, half-life of 2.80 d. Nano-pesticide formulations with high biological activity under the same conditions, its virulence is 1.235 times the virulence of the original drug, 1.245 times that of the virgin formulation.