Study on anti-pollution nano-preparation of dimethomorph and its performance

摘要

The photocatalysis of nanometer TKVAg was modified by sodium dodecyl sulfate, and its behavior of adsorption for pesticide was investigated on the surface of catalyst. Four kinds of water-solubility preparations were prepared by using TiO_2/Ag, modified TiO_2/Ag by 0.5 percent SDS, TiO_2 and nothingness as photocatalyst with dimethomorph as effective component. They were besmeared on a piece of glass, and the photocatalytic experiment was done in sunlight. Degradation rates of 1.2 percent dimethomorph are 71.5 percent, 68.0 percent, 45.5 percent and 28.3 percent, respectively, when it was degraded in five days. Degradation rate of 10 percent dimethomorph is 97.3 percent in eight days in sunlight and t_(1/2) is 2.8 d in nano-preparation, when it was sprayed on small cabbages after being diluted in rudimental experiments of toxidty for crop. The nano-preparation is of better biologic activity, the virulence of which is 1.235 times as great as original pesticide and 1.245 times as ordinary preparation under the same condition.