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A kind of titanium dioxide/boron nitride composite material and its preparation method and application

A technology of titanium dioxide and composite materials, applied in the direction of titanium oxide/hydroxide, titanium dioxide, catalyst activation/preparation, etc., can solve the problems that hinder the wide and in-depth development of technology, limit the utilization of solar energy, affect the utilization of visible light, etc. problems, to achieve the effect of improving unique properties, reducing the probability of compounding, and enhancing the effect of photodegradation

Active Publication Date: 2019-08-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although titanium dioxide photocatalytic technology has been studied and applied in various fields, some shortcomings of photocatalytic technology hinder the wider and deeper development of this technology. For example, (1) the energy band structure of titanium dioxide determines that it can only Utilize the ultraviolet light that is irradiated on the ground, and the ultraviolet light only accounts for 5% of sunlight, and the utilization rate of solar light energy is greatly limited; (2) the photogenerated electrons of titanium dioxide (e - ) and the hole pair (h + ) has a high recombination probability, which affects the utilization rate of titanium dioxide for visible light

Method used

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  • A kind of titanium dioxide/boron nitride composite material and its preparation method and application
  • A kind of titanium dioxide/boron nitride composite material and its preparation method and application
  • A kind of titanium dioxide/boron nitride composite material and its preparation method and application

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preparation example Construction

[0037] The present invention provides a kind of preparation method of titanium dioxide / boron nitride composite material in the first aspect, described method comprises the steps:

[0038] (1) Mix boric acid, carbon source (such as glucose or sucrose), nitric acid and urea with water (such as distilled water or deionized water) to obtain a mixed solution, and then heat the mixed solution to 300-500° C. (for example, 300 ℃, 350°C, 400°C, 450°C or 500°C) for 15 to 30 minutes (for example, 15, 20, 25 or 30 minutes) to obtain a precursor, and then the precursor is passed through ammonia gas at a temperature of 700 to 1000°C (such as 700°C, 800°C, 900°C or 1000°C) for 2 to 5 hours (such as 2, 3, 4 or 5 hours) to prepare boron nitride, which is a sheet-shaped hexagonal nitride boron (flaky hexagonal boron nitride); and

[0039] (2) Mix the titanium source and the boron nitride prepared in step (1) uniformly with an alcohol solvent to obtain a mixture, and then place the mixture in a...

Embodiment 1

[0057] Example 1: Preparation experiment of titanium dioxide / boron nitride composite material.

[0058] ①Preparation of boron nitride: the molar ratio of the raw materials boric acid, grape monohydrate, nitric acid and urea is 2:3:5:6, put the above-mentioned raw materials in a clean beaker, add 100mL of water, and keep stirring with glass Until all the solids are completely dissolved, the clarified mixed solution is finally obtained, and then the mixed solution is transferred to a porcelain boat, and the porcelain boat is put into a muffle furnace to start heating and heating (the heating rate is 15° C. / min). Carry out, the solution in the porcelain boat begins to bubble in the range of 90-100°C, and the solution starts to bubble when heated to about 350°C, and yellow foam appears. At this time, turn off the muffle furnace and let the reaction proceed spontaneously. The bottom of the boat expands to the mouth of the porcelain boat, releasing a lot of heat and yellow and black...

Embodiment 2

[0064] Example 2: Experiment of removal of rhodamine B by titanium dioxide / boron nitride composite material.

[0065] The titanium dioxide / boron nitride composite material used in this example is the titanium dioxide / boron nitride composite material prepared in Example 1.

[0066] Prepare 20 mL of Rhodamine B solution with an initial concentration of 10 mg / L (three parallel preparations), and record the initial concentration of Rhodamine B solution as C 0 .

[0067] Subsequent treatment process of three rhodamine B solutions: one part has not added titanium dioxide / boron nitride composite material (the mass ratio containing titanium dioxide and boron nitride is 8.6:1) (blank sample, denoted as blank), this part of solution Stir with magnetic force and place in dark environment for 30min (dark means dark environment), then irradiate with xenon lamp for 90min while magnetic stirring (light intensity is 100mW / cm 2 , using light to indicate xenon lamp irradiation); the other two...

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Abstract

The invention relates to a titanium dioxide / boron nitride composite material and its preparation method and application. The preparation method includes the following steps: mix boric acid, carbon source, nitric acid and urea with water to obtain a mixed liquid, then heat the mixed liquid to 300-500°C and keep it for 15-30 minutes to obtain a precursor, and then mix the The precursor is kept at a temperature of 700-1000°C for 2-5 hours under the condition of flowing ammonia gas to prepare boron nitride; use an alcohol solvent to mix the titanium source and the boron nitride prepared in step (1) evenly to obtain a mixture. , and then the mixture is kept at 150-180°C for 12-24 hours to prepare a titanium dioxide / boron nitride composite material. The boron nitride prepared by the present invention has a large specific surface area and a small band gap; the titanium dioxide / boron nitride composite material prepared by the present invention has good adsorption and photocatalytic effects on rhodamine B, and can achieve rapid and complete removal of rhodamine. B dye.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and in particular relates to a titanium dioxide / boron nitride composite material and its preparation method and application. Background technique [0002] In recent years, my country's dyestuff, papermaking, chemical and other industries have developed rapidly. According to statistics, about 600-700 million tons of dye wastewater flows into various water bodies every year in my country, which poses a great threat to the environment. The textile printing and dyeing industry is one of the industries with the largest water consumption, and the discharge of wastewater is also very large. On average, the discharge of wastewater from printing and dyeing processing 1 ton of fabric is about 100-200 tons. Printing and dyeing wastewater includes all kinds of wastewater discharged from various processes in the dyeing and printing process. With the difference in processing raw mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06C01G23/047C01B21/064B01J20/06B01J20/30B01J27/24B01J37/08C02F1/28C02F1/30C02F101/30
CPCB01J20/0259B01J20/06C01B21/0645C01G23/047C02F1/281C02F1/30B01J27/24B01J37/086C02F2305/10C02F2101/308B01J35/39
Inventor 侯新梅李群王恩会李斌陈俊红白帆
Owner UNIV OF SCI & TECH BEIJING
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