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Preparation method of floatable type recoverable photocatalyst based on single-crystal titanium dioxide

A technology of titanium dioxide and photocatalyst, which is applied in the field of photocatalysis, can solve the problems of weak binding force between catalyst and carrier, unsuitability for single crystal titanium dioxide, small surface area of ​​catalyst, etc., achieve good electron-hole separation effect, good catalytic degradation effect, The effect of good catalytic activity

Inactive Publication Date: 2016-05-04
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of supported photocatalysts basically adopts the method of dip coating to load commercial powdered titanium dioxide on the surface of the carrier. Although the process is simple, its disadvantages are also very obvious: the powdered titanium dioxide forms adsorption on the surface of the carrier, and the binding force between the catalyst and the carrier is weak. The stability is not high; the surface area of ​​the catalyst obtained by adsorption is small, and the catalytic effect is greatly affected
In addition, dip coating is to use nano-scale commercial titanium dioxide to mix with the carrier, and use the characteristics of large surface energy of nanoparticles to form adsorption with the carrier. This method is not suitable for the loading of single crystal titanium dioxide.

Method used

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  • Preparation method of floatable type recoverable photocatalyst based on single-crystal titanium dioxide
  • Preparation method of floatable type recoverable photocatalyst based on single-crystal titanium dioxide
  • Preparation method of floatable type recoverable photocatalyst based on single-crystal titanium dioxide

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Embodiment 1

[0026] This experimental procedure simply describes the specific preparation process, and the amount of catalyst prepared at a time is related to the volume of the autoclave.

[0027] A floating recyclable photocatalyst based on single crystal titanium dioxide, the preparation method of which is as follows:

[0028] 1) Fully mix the fly ash particles with 1% vinyltriethoxysilane (KH171) ethanol solution, let stand, and separate the floating fly ash particles;

[0029] 2) Transfer the fly ash particles separated in step 1) to an aqueous alcohol solution (the volume ratio of ethanol to water is 49:1), slowly add tetrabutyl titanate to a concentration of 1%, and stir thoroughly. Stand still, separate the floating fly ash particles, dry at 80°C, and then bake at 500°C for 2 hours to obtain fly ash particles loaded with titanium dioxide seeds;

[0030] 3) Prepare a solution of tetrabutyl titanate and concentrated hydrochloric acid at a volume ratio of 1:1, stir well until the syst...

Embodiment 2

[0033] This experimental procedure simply describes the specific preparation process, and the amount of catalyst prepared at a time is related to the volume of the autoclave.

[0034] A floating recyclable photocatalyst based on single crystal titanium dioxide, the preparation method of which is as follows:

[0035] 1) Fully mix the fly ash particles with 1% vinyltriethoxysilane (KH171) ethanol solution, let stand, and separate the floating fly ash particles;

[0036] 2) Transfer the fly ash particles separated in step 1) to an aqueous alcohol solution (the volume ratio of ethanol to water is 49:1), slowly add tetrabutyl titanate to a concentration of 1%, and stir thoroughly. Stand still, separate the floating fly ash particles, dry at 80°C, and then bake at 500°C for 2 hours to obtain fly ash particles loaded with titanium dioxide seeds;

[0037] 3) Prepare a solution of titanium tetrachloride and concentrated hydrochloric acid at a volume ratio of 1:1, stir well until the s...

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Abstract

The invention discloses a preparation method of a floatable type recoverable photocatalyst based on single-crystal titanium dioxide. Lightweight inorganic particle fly ash is taken as a carrier, and single-crystal titanium dioxide is synthesized on the surface of the carrier. Due to the special morphology of single-crystal titanium dioxide, single-crystal titanium dioxide has a larger specific surface area when growing on the surface of the carrier, so that the catalyst can be sufficiently contacted with organic matters, and the catalytic activity is higher. The preparation method of the catalyst is simple, adopts mild conditions and is easy to control; the density of the lightweight carrier is far smaller than that of water, the catalyst can float on the water surface, is not required to be stirred during use, is not affected by water turbidity, is easy to recover after being used and can be repeatedly used.

Description

technical field [0001] The invention relates to a preparation method of a photocatalyst, in particular to a preparation method of a floating recyclable photocatalyst based on single crystal titanium dioxide, which belongs to the technical field of photocatalysis. Background technique [0002] Titanium dioxide is the most widely used photocatalyst due to its advantages of non-toxicity, low price and high catalytic activity. Compared with ordinary titanium dioxide, single crystal titanium dioxide has a higher catalytic activity due to its direct electron channel and better separation of electrons and holes. Although titanium dioxide has good catalytic activity, it is subject to great limitations when used under natural conditions: (1) Due to the lack of continuous stirring conditions, titanium dioxide is easy to settle and reduce its catalytic effect; (2) The catalytic effect is affected by the transparency of water body (3) It is difficult to recover the catalyst, which is e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/08B01J35/10C02F1/30C02F101/38
CPCC02F1/30B01J21/08C02F2101/38C02F2305/10B01J35/39B01J35/615
Inventor 王金刚
Owner UNIV OF JINAN
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