Ti<3+> self-doped titanium dioxide photocatalyst and preparation method thereof

A technology of titanium dioxide and photocatalyst, which is applied in the field of photocatalytic materials, can solve the problems of complex instruments and difficult storage of reducing agents, and achieve the effects of low equipment requirements, good photocatalytic activity, and not easy to fail

Active Publication Date: 2017-02-15
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Preparation of Ti 3+ -TiO 2 Usually use NaBH 4 , high-temperature CO, active metal powder and other strong reducing agents to reduce the tetravalent titanium source or grow th

Method used

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  • Ti&lt;3+&gt; self-doped titanium dioxide photocatalyst and preparation method thereof
  • Ti&lt;3+&gt; self-doped titanium dioxide photocatalyst and preparation method thereof
  • Ti&lt;3+&gt; self-doped titanium dioxide photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] Measure 6 ml of butyl titanate, 2 ml of acetylacetone, 18 ml of ethanol and 2.92 g of aluminum acetylacetonate, mix and magnetically stir for 1 hour to obtain a mixed solution A. Prepare a mixed solution B containing 30 ml of ethanol and 2 ml of water in the same way. Under magnetic stirring, slowly drop the mixed liquid B into the mixed liquid A through a titration funnel to obtain a mixed, uniform and transparent sol. The prepared sol is allowed to stand for 48 hours, dried with an infrared lamp to obtain a gel, and then ground into a powder. The obtained powder is placed in a magnetic boat and annealed at 350°C for 2 hours at a heating rate of 10°C per minute in a muffle furnace to directly obtain self-doped titanium dioxide powder.

[0028] X-ray diffraction spectrum of the sample ( figure 2 ) It is consistent with the standard card of anatase titanium dioxide, indicating that the sample is anatase titanium dioxide; electron paramagnetic resonance s...

Example Embodiment

[0029] Example 2

[0030] Measure 6 ml of butyl titanate, 2.5 ml of acetylacetone, 24 ml of ethanol and 0.58 g of aluminum acetylacetonate, mix and magnetically stir for 1 hour to obtain a mixed solution A. Prepare a mixed solution B containing 40 ml of ethanol and 3 ml of water in the same way. Under magnetic stirring, slowly drop the mixed liquid B into the mixed liquid A through a titration funnel to obtain a mixed, uniform and transparent sol.

[0031] Clean the FTO conductive glass 3 times with 40~70% ethanol, and obtain a clean FTO conductive glass after drying. The sol was spin-coated on clean FTO conductive glass, dried and annealed at 350°C for 1 hour to obtain a sample electrode sheet. Connect the sample electrode sheet with the copper wire with conductive silver glue, and then encapsulate the working electrode with insulating silica gel. The photoelectrochemical test was carried out under a three-electrode system, with a platinum plate as the counter electrode and Ag / ...

Example Embodiment

[0033] Example 3

[0034] Measure 7 ml of butyl titanate, 3 ml of acetylacetone, 36 ml of ethanol and 5.84 g of aluminum acetylacetonate, mix and magnetically stir for 1 hour to obtain a mixed solution A. Prepare a mixture B containing 30 ml of ethanol and 4 ml of water in the same way. Under magnetic stirring, slowly drop the mixed liquid B into the mixed liquid A through a titration funnel to obtain a mixed, uniform and transparent sol. The obtained powder is placed in a magnetic boat and annealed at 450°C for 4 hours at a heating rate of 10°C per minute in a muffle furnace to directly obtain self-doped titanium dioxide powder.

[0035] The photocatalytic efficiency was evaluated by UV-visible degradation of methylene blue. Weigh 10 mg of the sample and mix with 10 ml of the methylene blue solution with a concentration of 5 mmol / L in a quartz reaction tube for 20 minutes. In the dark state, the mixed reaction solution is stirred for 2 hours to reach the equilibrium of adsorpti...

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Abstract

The invention belongs to the technical field of photocatalytic materials and specifically relates to a Ti<3+> self-doped titanium dioxide photocatalyst and a preparation method thereof. By utilizing a Ziegler-Natta method, the preparation method specifically comprises the following steps: dissolving butyl titanate, aluminum acetylacetonate and acetylacetone into ethanol, and dissolving water into ethanol; stirring to mix the two solutions; standing, so as to obtain sol; drying the sol, so as to obtain gel; grinding the obtained gel into powder; and carrying out high-temperature treatment, and naturally cooling, so as to obtain an ash black product Ti<3+>-TiO2. The photocatalytic capacity of TiO2 is improved by the product from the aspects of light absorption range, charge carrier transfer capacity and interface reaction speed, and the product has good photocatalytic activity and can be applied to the fields of photocatalytic degradation of organic pollutants, photolysis hydrogen production of water and photo-reduction of CO2.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, in particular to Ti 3+ Self-doped titanium dioxide photocatalyst and preparation method thereof. Background technique [0002] Ti 3+ Self-doped titanium dioxide (TiO 3+ -TiO 2 ) is a new research hotspot in the field of titanium dioxide modification in recent years, because it can improve the light absorption ability of titanium dioxide and inhibit the recombination of carriers without introducing heterogeneous atoms that generate electron-hole recombination centers. Preparation of Ti 3+ -TiO 2 Usually use NaBH 4 , high-temperature CO, active metal powder and other strong reducing agents to reduce the tetravalent titanium source or grow the trivalent titanium source controllably under the protective gas atmosphere, there are disadvantages that the reducing agent is not easy to preserve or the equipment is complicated. The present invention proposes a kind of by butyl titan...

Claims

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Application Information

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IPC IPC(8): B01J21/06C02F1/30B01D53/86B01D53/62C01B3/04C02F101/30C02F101/36C02F101/38
CPCB01D53/62B01D53/86B01D2259/802B01D2259/804B01D2259/81B01J21/063B01J35/004C01B3/042C02F1/30C02F2101/30C02F2101/36C02F2101/38C02F2101/40C02F2305/10Y02E60/36
Inventor 李乔丹崔晓莉
Owner FUDAN UNIV
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