Nitrogen-doped anatase TiO2 nano-sheet multilevel ball and preparation method thereof

A technology of nano-sheets and anatase, applied in the field of nitrogen-doped anatase TiO2 nano-sheet multi-level spheres and its preparation, can solve the problems of reaction system toxicity, easy pollution of the environment, strong corrosion, etc., and achieve green operation Environmental protection, high repeatability and good stability

Inactive Publication Date: 2015-07-15
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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  • Nitrogen-doped anatase TiO2 nano-sheet multilevel ball and preparation method thereof
  • Nitrogen-doped anatase TiO2 nano-sheet multilevel ball and preparation method thereof
  • Nitrogen-doped anatase TiO2 nano-sheet multilevel ball and preparation method thereof

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Example Embodiment

[0031] Example 1

[0032] Step 1: Accurately measure 71 mL of isopropanol solvent into the autogenous pressure reactor, add 0.09 mL of the shape control agent diethylene triamine and 4.50 mL (0.0134 mol) isopropyl titanate solution, and stir gently for 1 min To be evenly dispersed. Add accurately weighed 0.0492g (0.00164mol) urea to the above mixed solution, stir slowly for 1 minute and then ultrasonically disperse for 5 minutes;

[0033] Step 2: The above-mentioned reaction kettle containing the reaction mixture is sealed and placed in an oven at 200°C to crystallize the solution in the autoclave under autogenous pressure for 24 hours. After crystallization, cool to room temperature naturally, centrifuge the pale yellow slurry, wash the precipitate with absolute ethanol 4 times and dry at 60°C for 12 hours to obtain a pale yellow precursor, denoted as 0.12N-{001}TiO 2 -24, where 0.12 is the nominal molar ratio of nitrogen atoms to titanium atoms; 24 is the crystallization time;

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Example Embodiment

[0037] Example 2

[0038] Step 1: Accurately measure 71 mL of solvent isopropanol into the autogenous pressure reactor, add 0.09 mL of the shape control agent diethylene triamine and 4.50 mL (0.0134 mol) isopropyl titanate solution, and stir gently 1min to uniform dispersion. Add accurately weighed 0.12g (0.0041mol) of urea into the above mixed solution, stir slowly for 1 minute and then ultrasonically disperse for 5 minutes;

[0039] Step 2: The above-mentioned reaction kettle containing the reaction mixture is sealed and placed in an oven at 200°C, so that the solution in the high-pressure reaction kettle is crystallized under autogenous pressure for 24 hours. After crystallization, cool to room temperature naturally, centrifuge the light yellow slurry, wash the precipitate with absolute ethanol 4 times and dry at 60°C for 12 hours to obtain a light yellow multi-level structure precursor, denoted as 0.3N-{001}TiO 2 -24, where 0.3 is the nominal molar ratio of nitrogen atoms to t...

Example Embodiment

[0041] Example 3

[0042] Step 1: Accurately measure 71 mL of solvent isopropanol into the autogenous pressure reactor, add 0.09 mL of the shape control agent diethylene triamine and 4.50 mL (0.0134 mol) isopropyl titanate solution, and stir gently 1min to uniform dispersion. Add accurately weighed 0.4920g (0.0164mol) urea into the above mixed solution, stir slowly for 1 minute and then ultrasonically disperse for 5 minutes;

[0043] Step 2: The above-mentioned reaction kettle containing the reaction mixture is sealed and placed in an oven at 200°C to crystallize the solution in the autoclave under autogenous pressure for 24 hours. After crystallization, cool to room temperature naturally, centrifuge the light yellow slurry, wash the reaction precipitate with absolute ethanol 4 times and dry at 60°C for 12 hours to obtain a light yellow hierarchical structure precursor, denoted as 1.2N-{001}TiO 2 -24, where 1.2 is the nominal molar ratio of nitrogen atoms to titanium atoms; 24 is ...

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Abstract

The invention discloses a nitrogen-doped anatase TiO2 nano-sheet multilevel ball and a preparation method thereof and belongs to the technical field of multilevel structural nano material photocatalysis. The multilevel ball is of a nano/micro ball structure formed by self assembling of large amount of nano-sheets, wherein the nano-sheets are regular in shape and uniform in size and are obliquely intersected and tightly stacked; the nano-sheets are 250-750nm in length and 7-12nm in thickness; the size of the nano/micro ball is 500-1500nm; the specific surface area is as high as 102-460m2/g and the {001} surface exposure rate is 89-99%. The preparation method comprises the steps of preparing a nano-sheet multilevel ball precursor in a reaction system with isopropyl titanate as a titanium source, urea as a nitrogen source, diethylenetriamine as an appearance control agent and isopropanol as a solvent by adopting a one-step in-situ solvothermal method, placing the precursor into a tube-type oven and roasting the precursor in air atmosphere to obtain the nitrogen-doped anatase TiO2 nano-sheet multilevel ball with the {001} surface having high exposure rate. The catalyst is relatively small in energy gap, large in specific surface area, high in photocatalysis efficient, good in stability, simple in synthesis method and easy to produce.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis of multi-level structure nanomaterials, and in particular provides a nitrogen-doped anatase TiO with a high exposure rate of the {001} plane 2 Nano sheet multi-level ball and its preparation method. technical background [0002] Photocatalysis technology can not only directly use solar energy to photolyze water to generate energy material hydrogen, but also can be used as an effective method to catalyze the degradation of organic pollutants, and at the same time solve the energy crisis and environmental pollution problems that the world is facing. Since Fujishima and Honda first discovered the phenomenon of photocatalytic water splitting, titanium dioxide has become the most extensively researched photocatalytic material with the most potential application value due to its outstanding advantages such as strong oxidation ability, stable chemical properties, and non-toxicity. However, anatas...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J13/02B01J35/08C01G23/053B82Y40/00B82Y30/00C02F1/32
CPCY02W10/37
Inventor 张慧钟丽
Owner BEIJING UNIV OF CHEM TECH
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