A spherical core-shell tio 2 /tio 2 Materials and their preparation methods

A core-shell, spherical technology, used in chemical instruments and methods, water/sludge/sewage treatment, chemical/physical processes, etc. and other problems, to achieve the effect of photocatalytic activity recovery, reusability, low cost, and risk reduction.

Inactive Publication Date: 2019-07-09
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the currently reported loading method is mainly the sol-gel-impregnation method, which prepares nano-TiO 2 The photocatalyst film has limited immobilization capacity, relatively small specific surface area, and poor adsorption capacity, which affects the photocatalytic efficiency. At the same time, due to TiO 2 The colloidal nature of the powder makes it easy to agglomerate and agglomerate the powder during washing, drying, and roasting, and particles with good dispersibility cannot be obtained, thereby inhibiting the TiO 2 fully utilize
Even if particles with good dispersion can be obtained, the particles are easily lost in the running water when treating wastewater and cannot be recycled and reused

Method used

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  • A spherical core-shell tio <sub>2</sub> /tio <sub>2</sub> Materials and their preparation methods
  • A spherical core-shell tio <sub>2</sub> /tio <sub>2</sub> Materials and their preparation methods
  • A spherical core-shell tio <sub>2</sub> /tio <sub>2</sub> Materials and their preparation methods

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preparation example Construction

[0034] A kind of spherical core-shell type TiO provided by the invention 2 / TiO 2 Material and preparation method thereof (preparation schematic diagram sees figure 1 ), comprising the following steps: first take commercially available TiO 2 (P25) The powder is placed in a reaction kettle filled with NaOH solution and reacted at 120-300°C for 6-48 hours. The reaction product washed with deionized water is immersed in HCl solution for ion exchange reaction to replace Na + , washed again with deionized water until neutral, and then dried in a blast drying oven at 80°C for 2 hours. The obtained product is mixed with a solution dissolved in titanium nitrate and urea to form a suspension; the suspension is stirred, mixed and emulsified with liquid paraffin dissolved in Triton X-100 to form a Pickering emulsion; then the above-mentioned emulsion is placed at 60- React in an oil bath at 150°C for 3 to 10 hours to obtain a precipitate, which is distilled, dried, and calcined to obt...

Embodiment 1

[0042] (1) Commercially purchased TiO 2 (P25) 2g of powder was placed in a reaction kettle filled with 70ml of 5.3mol / l NaOH solution and reacted at 140°C for 24h, and the reaction product was washed with deionized water to obtain a white titanium dioxide nanotube precursor.

[0043] (2) Submerge the product obtained in (1) in a 0.1 mol / l HCl solution for 1 hour of ultrasonication, then let it stand for 24 hours, and then wash it with deionized water until neutral.

[0044] (3) Dry the product obtained in (2) at 80° C. for 2 h in a forced air drying oven.

[0045] (4) Dissolve urea and titanium nitrate in 30ml deionized water, press Ti 4+ The concentration is 0.5mol / L, and the concentration of urea is 3mol / L to make a solution;

[0046] (5) Mix 0.5 g of the product obtained in (3) with the solution described in (4), and magnetically stir for 0.5 h (500 rpm) to form a suspension;

[0047] (6) Dissolve 0.1g Triton X-100 in 20ml liquid paraffin, stir magnetically for 0.5h (500...

Embodiment 2

[0052] (1) Commercially purchased TiO 2 (P25) 2g of powder was placed in a reaction kettle filled with 70ml of 10mol / l KOH solution and reacted at 220°C for 36h, and the reaction product was washed with deionized water to obtain a white titanium dioxide nanowire precursor.

[0053] (2) Submerge the product obtained in (1) in a 0.1 mol / l HCl solution for 1 hour of ultrasonication, then let it stand for 24 hours, and then wash it with deionized water until neutral.

[0054] (3) Dry the product obtained in (2) at 80° C. for 2 h in a forced air drying oven.

[0055] (4) Dissolve urea and titanium nitrate in 30ml deionized water, press Ti 4+ The concentration is 1.0mol / L, and the concentration of urea is 6mol / L to prepare a solution;

[0056] (5) Mix 0.5 g of the product obtained in (3) with the solution described in (4), and magnetically stir for 0.5 h (500 rpm) to form a suspension;

[0057] (6) Dissolve 0.1g Triton X-100 in 20ml liquid paraffin, stir magnetically for 0.5h (50...

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Abstract

The invention discloses a spherical core-shell structure TiO2 / TiO2 material and a preparation method thereof and belongs to the field of nanocomposite. Titanium nitrate is used as a precursor, and by the combination of homogeneous precipitation process and calcination process, a titanium dioxide solid core is prepared. The surface of the solid core is coated with nano titanium dioxide particles / nanotubes, nanobelts and nanowires through a Pickering emulsion method, a porous shell layer is thus formed, and after high-temperature calcination, a core-shell type TiO2 / TiO2 microsphere is obtained. The core-shell type titanium dioxide material is uniform and spherical, and the particle size of the materials is controllable; the microsphere can be used as a surfactant and has a UV photoresponse property. Compared with TiO2 nanoparticles, the photocatalytic performance of the material is stronger, and the recovery rate is high.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials, in particular to a spherical core-shell TiO 2 / TiO 2 Materials and their preparation methods. Background technique [0002] Nano-TiO 2 It has many advantages such as high photocatalytic activity, good chemical stability, harmless to human body, etc. It becomes an ideal environment-friendly photocatalyst and can be widely used in various organic wastewater treatment. However, the existing TiO in wastewater treatment 2 It is difficult for catalyst products to meet the requirements of maintaining high catalytic activity and being easy to recycle and reuse. Nano TiO 2 It is evenly distributed on the surface of large particle powder (micron size) and other carriers in the form of a shell, with a relatively high specific surface area, good dispersion, and many adsorption points. 2 The effect on the activity is small, and the good recyclability of the large carrier can be used to r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06C02F1/30
CPCB01J21/063B01J35/004C02F1/30C02F2305/10
Inventor 常鹰董仕节王辉虎谌援柯凯何瑶冯婷刘阳
Owner HUBEI UNIV OF TECH
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