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Precious metal-titanium dioxide nanocomposite particle preparation method

A nano-composite particle, titanium dioxide technology, applied in chemical instruments and methods, catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, etc., can solve the loss of metal salts, affect catalyst performance, and use poor stability. and other problems, to achieve the effect of improving utilization efficiency and high visible light catalytic activity

Inactive Publication Date: 2014-02-05
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal salt-doped catalysts will lose metal salts during use, especially under water environment conditions, which will affect the performance of the catalyst, and the use stability is not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The emulsifier is a block copolymer of butene-ethylene copolymer as the hydrophobic segment and polyoxyethylene as the hydrophilic segment [referred to as P(E / B)-PEO]. Weigh 1g and dissolve it in 500g Isopar M (C12~C16 a mixture of alkanes, Exxon Mobil), to obtain an emulsifier solution. The preparation method of this block copolymer sees literature [Schlaad H, Kukula H, Runloff J, Below I.Macromolecules, 2001,34,4302-4304.Thomas A, Schlaad H, Smarsly B, Antonietti M.Langmuir, 2003,19 ,4455-4459.]

[0044] 2.5g chloroauric acid is dissolved in the polar solvent that 20 grams of dimethyl sulfoxides and 6.3 grams of water form, obtains gold salt solution, gold salt solution is joined in above-mentioned emulsifier solution, with ultrasonic wave above-mentioned mixed solution is dispersed, A stable inverse miniemulsion was obtained.

[0045] At 85° C., 20 g of tetraethyl titanate was added to the above inverse miniemulsion, the temperature was raised to 100° C., and the r...

Embodiment 2

[0049] The emulsifier was SPAN80, weighed 79.5g, and dissolved in 795g of cyclohexane to obtain an emulsifier solution.

[0050] 5g of chloroplatinic acid was dissolved in 53 grams of water to obtain a platinum salt solution. The platinum salt solution was added to the emulsifier solution, and the mixed solution was dispersed by ultrasonic waves to obtain a stable inverse miniemulsion.

[0051] At 30° C., 100 g of tetrabutyl titanate was added to the inverse miniemulsion, the temperature was raised to 60° C., and the reaction was carried out for 10 hours to obtain a dispersion containing platinum salt-titanium dioxide nanocomposite particles.

[0052] Add 56 g of tetramethylethylenediamine to the above dispersion containing platinum salt-titanium dioxide nanocomposite particles, raise the temperature to 30° C., and react for 48 hours to obtain a dispersion containing platinum-titania nanocomposite particles.

[0053] High-speed centrifugation separates the platinum-titania nan...

Embodiment 3

[0056] Weigh emulsifier SPAN-809.0g and OP-109.0g, dissolve in 100g hexadecane to obtain emulsifier solution.

[0057] Dissolve 0.1 g of silver tetrafluoroborate into a mixed solution composed of 38 g of dimethylformamide and 0.8 g of water to obtain a silver salt solution, add the silver salt solution to the above-mentioned emulsifier solution, and disperse the above-mentioned mixed solution with ultrasonic waves, A stable inverse miniemulsion was obtained.

[0058] At 90°C, 10 g of tetraisopropyl titanate was added to the above inverse miniemulsion, the temperature was raised to 150°C, and the reaction was carried out for 30 minutes to obtain a dispersion containing silver salt-titanium dioxide nanocomposite particles.

[0059] Add 0.6 g of 80% hydrazine hydrate to the above dispersion containing silver salt-titanium dioxide nanocomposite particles, raise the temperature to 50° C., and react for 1 hour to obtain a dispersion containing silver-titania nanocomposite particles....

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Abstract

The invention discloses a precious metal-titanium dioxide nanocomposite particle preparation method. The method comprises the following steps: dispersing an aqueous solution of a precious metal salt in a solution containing an emulsifier having a low HLB value to prepare an anti-phase miniemulsion containing liquid drops of the aqueous solution of the precious metal salt; adding a titanium-containing precursor, and carrying out a hydrolysis condensation reaction to prepare precious metal salt-titanium dioxide nanocomposite particles; carrying out internal in-situ reduction of the precious metal salt in the composite particles by a reducing agent to obtain precious metal-titanium dioxide nanocomposite particles; and calcining at different temperatures to prepare precious metal-titanium dioxide nanocomposite particles having different crystal form structures. The precious metal-titanium dioxide nanocomposite particles obtained in the invention have a high visible photocatalytic activity, and have large potential application values in the field of the photocatalytic decomposition of water, the organic wastewater treatment field, the field of the photocatalysis of organic reactions, the field of solar batteries, and the like.

Description

(1) Technical field [0001] The invention relates to a preparation method of noble metal-titania nanocomposite particles, in particular to a preparation method of noble metal-titania nanocomposite particles with visible light catalytic activity. (2) Background technology [0002] Nano-titanium dioxide is a semiconductor material with a wide band gap (band gap > 3eV). Only after absorbing ultraviolet light can titanium dioxide be excited to show photocatalytic activity. Its photocatalytic activity is generally believed to be carried out according to the following mechanism. When titanium dioxide absorbs photons with a wavelength less than or equal to 387nm, the valence band electrons (e-) will be excited to jump to the conduction band, leaving a corresponding positive charge in the valence band. holes (h + ). The valence band electrons are separated from the holes under the action of the electric field, migrate to the surface, and combine with the oxygen adsorbed on the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J23/42B01J23/50B01J37/00B82Y30/00B82Y40/00C02F1/30
CPCY02W10/37
Inventor 曹志海
Owner HANGZHOU NORMAL UNIVERSITY
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