Indirect glomeration dispersedly fixed type nano titanium dioxide particle preparation method

[0040] Embodiment 1, as shown in Figure 7:

[0041] (a) pretreatment of titanium dioxide nanoparticles,

[0042] Add 100 mg of titanium dioxide nanoparticles into a NaOH solution with a concentration of 0.5 mol / L, and magnetically stir at a speed of 500 rpm for 7 hours, then wash with water three times and centrifuge until the pH is 7 for use.

[0043] (b) carbon coated on the surface of nanoparticles,

[0044]Add 100 mg of nanoparticles prepared in step (a) into polyvinyl alcohol resin (PVA) in an aqueous solution of carbon-containing organic matter soluble in water at a concentration of 0.7 mol / L. After thorough mixing, the mixed solution was introduced into a hydrothermal reaction kettle, and heat-treated at 150° C. for 2 hours. After the reaction, it was washed three times with methanol, an organic solvent, and three times with distilled water, and then dried for use.

[0045] (c) the outer layer of carbon-coated nanoparticles coated with silica,

[0046] (1) Stir 100 ...

[0052] Embodiment 2, as shown in Figure 7:

[0053] (a) pretreatment of titanium dioxide nanoparticles,

[0054] Add 500 mg of titanium dioxide nanoparticles into the HCL solution with a concentration of 1.2 mol / L, and magnetically stir at 1000 rpm for 14 hours, then wash with water five times and centrifuge until the pH is 7 for use.

[0055] (b) carbon coated on the surface of nanoparticles,

[0056] Add 450 mg of nanoparticles prepared in step (a) into polyethylene glycol (PEG) in an aqueous solution of carbon-containing organic matter soluble in water at a concentration of 2.2 mol / L. After thorough mixing, the mixed solution was introduced into a hydrothermal reaction kettle, and heat-treated at 200° C. for 8 hours. After the reaction, wash with organic solvent ethanol for 7 times, wash with distilled water for 7 times, and then dry for use.

[0057] (c) the outer layer of carbon-coated nanoparticles coated with silica,

[0058] (1) Stir 450 mg of the sample obtained i...

[0064] Embodiment 3, as shown in Figure 7:

[0065] (a) pretreatment of titanium dioxide nanoparticles,

[0066] Add 300 mg of titanium dioxide nanoparticles into NaOH solution with a concentration of 0.8 mol / L, magnetically stir at 750 rpm for 10 hours, wash with water four times and centrifuge until the pH is 7 for use.

[0067] (b) carbon coated on the surface of nanoparticles,

[0068] Add 275 mg of nanoparticles prepared in step (a) into 1.4 mol / L aqueous solution of soluble carbon-containing organic matter sucrose (Sucrose). After thorough mixing, the mixed solution was introduced into a hydrothermal reaction kettle, and heat-treated at 175° C. for 5 hours. After the reaction, it was washed 5 times with the organic solvent acetone, and then 5 times with distilled water, and then dried for use.

[0069] (c) the outer layer of carbon-coated nanoparticles coated with silica,

[0070] (1) Stir 275 mg of the sample obtained in step (b), 10 ml of chloroform, 450 μl of ultr...