Method for preparing titanium dioxide nano ply

Abstract

The invention relates to a method for preparing a titanium dioxide nano ply. The method comprises the following steps: after milling lamellar K2Ti4O9 powder dryly at room temperature on a high-energy ball mill at the ball-milling speed of 500-5000rpm for 1-10h, suspending in 1M of hydrochloric acid solution and stirring for 1-10h, wherein the mass ratio of the lamellar K2Ti4O9 powder to the hydrochloric acid solution is 1:50-500; then, adding 0.5M of ammonia, regulating the pH to 1-10, separating centrifugally, washing by distilled water, drying in vacuum at the room temperature to 100 DEG C for 3-24h and finally, calcining at the temperature of 300-1000 DEG C for 1-10h to obtain the titanium dioxide nano ply. The invention has the advantages of simple operation, high efficiency, low cost, high specific surface area and the like, and the radial size of an obtained product is smaller than 100nm.

Description

technical field

[0001] The invention relates to a method for preparing titanium dioxide nano-sheets. Background technique

[0002] Titanium dioxide is widely used in many fields due to its unique physical and chemical properties. Flake titanium dioxide is widely used in pigments, optical functional materials, cosmetics and other fields.

[0003] CN1193333 provides a flaky titanium dioxide obtained by solidifying an aqueous solution of a heat-hydrolyzable titanium compound on a continuous belt, peeling off, suspension coating, separating and drying (calcining), and its lamella thickness is less than 500 nanometers. CN1193334 provides a kind of flaky titanium dioxide prepared by the same method as CN1193333 and the flaky titanium dioxide reduced pigment obtained by reducing the flaky titanium dioxide. The thickness of the flaky titanium dioxide obtained by the above two methods is large, so the specific surface area of ​​the obtained flaky titanium dioxide is low, and the ap...

Examples

Embodiment 1

[0020] At room temperature, 10 g of layered K 2 Ti 4 o 9 The powder was dry-milled for 2 h in a high-energy ball mill at a ball milling speed of 1000 rpm. The ball-milled powder was suspended in 600 ml of 1M hydrochloric acid solution and stirred for 1 h. Then add 0.5M ammonia water to adjust the pH=4, centrifuge (7000rpm, centrifuge time 10 minutes), wash with distilled water, vacuum dry at 50°C for 2h, and finally calcined at 300°C for 1h to obtain anatase and monoclinic mixed phase titanium dioxide nanosheets. The microscopic morphology is irregular nano-layers, most of the layers are less than 50nm in radial direction, and the photocatalytic test shows photocatalytic activity.

Embodiment 2

[0022] Except that the calcination temperature was changed to 500° C. and the calcination time was changed to 2 hours, other operations were the same as in Example 1 to obtain titanium dioxide nanosheets in anatase phase.

Embodiment 3

[0024] Except that the calcination temperature was changed to 800° C. and the calcination time was changed to 2 hours, other operations were the same as in Example 1, and pure rutile titanium dioxide nanosheets appeared.

[0025] Example

[0026] The specific surface area of ​​the titanium dioxide nanosheets prepared in the embodiment 1-3 of table 1

technical field

[0001] The invention relates to a method for preparing titanium dioxide nano-sheets. Background technique

[0002] Titanium dioxide is widely used in many fields due to its unique physical and chemical properties. Flake titanium dioxide is widely used in pigments, optical functional materials, cosmetics and other fields.

[0003] CN1193333 provides a flaky titanium dioxide obtained by solidifying an aqueous solution of a heat-hydrolyzable titanium compound on a continuous belt, peeling off, suspension coating, separating and drying (calcining), and its lamella thickness is less than 500 nanometers. CN1193334 provides a kind of flaky titanium dioxide prepared by the same method as CN1193333 and the flaky titanium dioxide reduced pigment obtained by reducing the flaky titanium dioxide. The thickness of the flaky titanium dioxide obtained by the above two methods is large, so the specific surface area of ​​the obtained flaky titanium dioxide is low, and the ap...

Examples

Embodiment 1

[0020] At room temperature, 10 g of layered K 2 Ti 4 o 9 The powder was dry-milled for 2 h in a high-energy ball mill at a ball milling speed of 1000 rpm. The ball-milled powder was suspended in 600 ml of 1M hydrochloric acid solution and stirred for 1 h. Then add 0.5M ammonia water to adjust the pH=4, centrifuge (7000rpm, centrifuge time 10 minutes), wash with distilled water, vacuum dry at 50°C for 2h, and finally calcined at 300°C for 1h to obtain anatase and monoclinic mixed phase titanium dioxide nanosheets. The microscopic morphology is irregular nano-layers, most of the layers are less than 50nm in radial direction, and the photocatalytic test shows photocatalytic activity.

Embodiment 2

[0022] Except that the calcination temperature was changed to 500° C. and the calcination time was changed to 2 hours, other operations were the same as in Example 1 to obtain titanium dioxide nanosheets in anatase phase.

Embodiment 3

[0024] Except that the calcination temperature was changed to 800° C. and the calcination time was changed to 2 hours, other operations were the same as in Example 1, and pure rutile titanium dioxide nanosheets appeared.

[0025] Example

[0026] The specific surface area of ​​the titanium dioxide nanosheets prepared in the embodiment 1-3 of table 1

Images