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: 2019-11-12
FUDAN UNIV
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  • Summary
  • 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 the trivalent titanium source controllably under the protective gas atmosphere, there are disadvantages that the reducing agent is not easy to store or the instrument is complicated

Method used

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  • ti <sup>3+</sup> Self-doped titanium dioxide photocatalyst and preparation method thereof
  • ti <sup>3+</sup> Self-doped titanium dioxide photocatalyst and preparation method thereof
  • ti <sup>3+</sup> Self-doped titanium dioxide photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 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. Mixture B containing 30 ml of ethanol and 2 ml of water was prepared in the same way. Under magnetic stirring, slowly drop the mixed solution B into the mixed solution A through a titration funnel to obtain a mixed, uniform and transparent sol. The prepared sol was left to stand for 48 hours, dried with an infrared lamp to obtain a gel, and then ground into powder. The obtained powder was 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 obtain self-doped titanium dioxide powder directly.

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

Embodiment 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. Mixture B containing 40 ml of ethanol and 3 ml of water was prepared in the same way. Under magnetic stirring, slowly drop the mixed solution B into the mixed solution A through a titration funnel to obtain a mixed, uniform and transparent sol.

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

Embodiment 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. Mixture B containing 30 ml of ethanol and 4 ml of water was prepared in the same way. Under magnetic stirring, slowly drop the mixed solution B into the mixed solution A through a titration funnel to obtain a mixed, uniform and transparent sol. The obtained powder was 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 obtain self-doped titanium dioxide powder directly.

[0035] The photocatalytic efficiency was evaluated by UV-vis photodegradation of methylene blue. Weigh 10 mg of the sample, and ultrasonically mix it with 10 ml of 5 mmol / L methylene blue solution in a quartz reaction tube for 20 minutes. The mixed reaction solution was stirred for 2 hours in a dark state to reach adsorption-desorption equilibrium. The reac...

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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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Patent Type & Authority Patents(China)
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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