Preparation method and use of an atomic-state fluid iodine and its derived nano-iodine

A medicine for a plant disease, comprising:

• an atomic-state fluid iodine, an atomic-state nano-iodine, a liquid of the atomic-state nano-iodine, and a solid of the atomic-state nano-iodine;
• wherein
• the atomic-state fluid iodine is of a solid state with a black color and a metallic luster under a temperature of below 10° C.,
• under a temperature of 10-100° C., the atomic-state fluid iodine is of a fluid state, a main body of the atomic-state fluid iodine has a black color, and a margin of the atomic-state fluid iodine has a dark red color, a specific gravity of the atomic-state fluid iodine is 3.8-4.0 g/ml, and the atomic-state fluid iodine is stable without a sublimation under a light condition, and
• the atomic-state fluid iodine is soluble in a polar organic solvent, and insoluble in water and a non-polar organic solvents, and the atomic-state fluid iodine presents an atomic cluster agglutination in the water;
• wherein the atomic-state fluid iodine is prepared by a method comprising the following steps in a pseudo-critical reaction system:
• (1) dispersing and mixing a solid iodine in a solvent to obtain a first mixture, then stirring and refluxing the first mixture under 110 to 200° C. to obtain a liquid distillate, cooling the liquid distillate to room temperature, thereafter separating a lower-layer liquid in a delivery flask, wherein the solvent is selected from the group consisting of dimethyl sulfoxide, diphenyl sulfone, triethanolamine, N-methylpyrrolidone, sulfolane and N, N-dimethylformamide,
• (2) purifying:
• washing the lower-layer liquid with distilled water and a non-polar solvent to remove a water-soluble substance and an ester-soluble substance produced by a solvent decomposition to obtain a purified lower-layer liquid, and
• (3) placing the purified lower-layer liquid in a low temperature environment lower than 10° Ctill solidifying, thereafter removing an upper-layer solution to obtain a solid product, placing the solid product in room temperature till the solid product turning into fluid to obtain the atomic-state fluid iodine;
• wherein the atomic-state nano-iodine is prepared by mixing and blending the atomic-state fluid iodine with the polar organic solvent as a dispersion medium, when the atomic-state nano-iodine is dispersed in water to form a first dispersed particle, a diameter range of the first dispersed particle is 100-300 nm, and when the atomic-state nano-iodine is dispersed in an air medium to form a second dispersed particle, a diameter range of the second dispersed particle is 90-120 nm;
• wherein the liquid of the atomic-state nano-iodine is obtained by adding the atomic-state nano-iodine into distilled water for an oscillation and a dispersion, the liquid atomic-state fluid iodine is stored at a temperature of 4 to 20° C., and a volume ratio of the atomic-state nano-iodine to the distilled water is 0.1-1:100;
• wherein the solid of the atomic-state nano-iodine is obtained by centrifuging the liquid of the atomic-state nano-iodine at a speed of 3000-5000 rpm under a low temperature for 3-8 minutes, and the solid of the atomic-state nano-iodine is stably stored at a temperature of 4 to 8° C.;
• said the plant disease includes Citrus Huanglongbing, Citrus bacterial canker disease, banana panama disease, fruit tree branch blight disease or dry rot disease.