Silicate-coated titanium dioxide photocatalyst powder and preparation method thereof

A titanium dioxide and photocatalyst technology, applied in the field of photocatalytic materials, can solve the problems of difficult dispersion of titanium dioxide, unstable adsorption, low coating rate, etc., and achieve improved photochemical stability, excellent water and oil phase dispersibility, and photocatalytic activity. high effect

Active Publication Date: 2019-03-08
SHANGHAI STO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a silicate-coated titanium dioxide photocatalyst powder and its preparation method, to overcome the silicon material in the prior art that cannot be stably adsorbed on the surface of titanium dioxide, the coating rate is low and uncontrollable, and the degradation Insufficiencies such as organic carrier and titanium dioxide are difficult to disperse

Method used

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  • Silicate-coated titanium dioxide photocatalyst powder and preparation method thereof
  • Silicate-coated titanium dioxide photocatalyst powder and preparation method thereof
  • Silicate-coated titanium dioxide photocatalyst powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (preparation of titanium dioxide photocatalyst powder with a silicate mass fraction of about 5%)

[0035](1) Add photocatalyst titanium dioxide to absolute ethanol, shake and stir for 1 hour until titanium dioxide is completely dispersed into dispersion A, wherein the mass percentage of photocatalyst titanium dioxide in dispersion A is 5%; stir while dispersing A saturated solution of sodium bicarbonate was added dropwise to liquid A until the pH was adjusted to 8 to obtain dispersion B.

[0036] (2) Add the liquid aminosilane coupling agent KH-540 dropwise to the dispersion B, and heat the dispersion B to 80°C at the same time, the amount of KH-540 added is 1.2% of the volume fraction of the dispersion B; Under ambient conditions, stir at a low speed to react for 4 hours; stop heating and allow it to cool to room temperature, filter the dispersion B to obtain solid C, wash and filter solid C alternately and repeatedly with absolute ethanol and 10% dilute sulfuric acid ...

Embodiment 2

[0042] (preparation of titanium dioxide photocatalyst powder with about 10% silicate mass fraction)

[0043] (1) Add photocatalyst type titanium dioxide to absolute ethanol, shake and stir for 0.8 hours until titanium dioxide is completely dispersed into dispersion A, wherein the mass percentage of photocatalyst type titanium dioxide in dispersion A is 5%; stir while dispersing A saturated solution of sodium bicarbonate was added dropwise to liquid A until the pH was adjusted to 8 to obtain dispersion B.

[0044] (2) Then add aminosilane coupling agent KH-550 dropwise to the dispersion B while heating, the amount of KH-550 added is 1.0% of the volume fraction of the dispersion B; Under the condensing and reflux environment, stir at high speed to make it react for 2 hours; stop heating and let it cool to room temperature, filter the dispersion B to obtain the solid C, alternately wash and filter the solid C with absolute ethanol and 10% dilute sulfuric acid , until the pH of t...

Embodiment 3

[0050] (preparation of titanium dioxide photocatalyst powder with about 30% silicate mass fraction)

[0051] (1) Add photocatalyst titanium dioxide to absolute ethanol, shake and stir for 1 hour until titanium dioxide is completely dispersed into dispersion A, wherein the mass percentage of photocatalyst titanium dioxide in dispersion A is 1.2%; stir to disperse Saturated sodium bicarbonate solution was added dropwise to solution A until the pH was adjusted to 9.

[0052] (2) After heating to 80°C, start to condense and reflux, add the aminosilane coupling agent SG-Si902 dropwise to the dispersion A within 1 hour, and continue to condense and reflux for 3 hours to obtain the dispersion B, SG-Si902 The amount added is 0.8% of the volume fraction of the dispersion B; stop heating and allow it to cool to room temperature, filter the dispersion B to obtain the solid C, alternately wash and filter the solid C with absolute ethanol and 10% dilute sulfuric acid, Until the pH of the ...

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Abstract

The invention provides silicate-coated titanium dioxide photocatalyst powder and a preparation method thereof. According to the preparation method, photocatalyst-type titanium dioxide serves a carrier, silica sol serves as a coating material, an amino silane coupling agent serves as a chelating agent, titanium dioxide particles are coated with silicate, the particle size of the coated titanium dioxide photocatalyst powder of 0.5-1.5 micrometers, the specific surface area is larger than or equal to 200m<2>/g, and the coated titanium dioxide photocatalyst powder contains 5-40% of the silicate bymass and can be used for preparing high-solid-content photocatalyst aqueous solutions and photocatalytic materials taking organic matter as a carrier. The silicate-coated titanium dioxide photocatalyst powder has the advantages of stable silicate adsorption, high coating rate, controllability, low oil absorption, high photocatalytic activity and the like; by the photocatalyst powder easy to disperse, degradation of the organic carrier is avoided; the preparation method has the advantages of easiness in acquisition of raw materials, simplicity and convenience in process, stable silicate coating and controllable coating rate.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a silicate-coated titanium dioxide photocatalyst powder and a preparation method thereof. Background technique [0002] As a common photocatalyst, titanium dioxide has the advantages of large specific surface area, photocatalytic and absorption capacity, good weather resistance and chemical corrosion resistance, and non-toxic to the human body. It has certain applications in the field of photocatalysis. By absorbing photons, the surface of titanium dioxide Redox free radicals are generated, which react chemically with external substances, and can realize functions such as hydrogen production by hydrolysis and removal of harmful substances. However, when titanium dioxide is used to prepare photocatalytic materials, due to the poor dispersion stability of titanium dioxide particles and difficulty in infiltrating in the organic phase, it cannot show sati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/08B01J31/38B01J35/00B01J35/02B01J35/10
CPCB01J21/08B01J31/38B01J35/004B01J35/023B01J35/026B01J35/1019
Inventor 管洲林宣益朱明
Owner SHANGHAI STO
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