SiO2@TiO2 nuclear shell structure with stable dispersion and controllable photocatalysis, preparing method and application thereof

A technology with photocatalytic activity and core-shell structure, applied in chemical instruments and methods, chemical/physical processes, light water/sewage treatment, etc., can solve poor stability and weather resistance, affect product dispersibility, product yellowing and shedding, etc. problem, to achieve the effects of stable dispersion, controllable photocatalytic activity, uniform shell thickness and

Active Publication Date: 2017-01-11
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a semiconductor, titanium dioxide can generate strong oxidizing holes and hydroxyl radicals under the excitation of ultraviolet light, and photocatalytically degrade organic substances adsorbed on its surface. Nanoscale TiO 2 Small particles, large specific surface area, etc., are conducive to the further enhancement of photocatalytic activity, but the high surface energy makes it easy to agglomerate
TiO 2 It is an important additive in paints, paints and other products. The high photocatalytic activity can easily degrade the organic film-forming substances in paints and paints, resulting in yellowing and falling off of the product, poor stability and weather resistance; and TiO 2 The agglomeration problem also affects product dispersion

Method used

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  • SiO2@TiO2 nuclear shell structure with stable dispersion and controllable photocatalysis, preparing method and application thereof
  • SiO2@TiO2 nuclear shell structure with stable dispersion and controllable photocatalysis, preparing method and application thereof
  • SiO2@TiO2 nuclear shell structure with stable dispersion and controllable photocatalysis, preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A stable dispersed SiO with controllable photocatalytic activity 2 @TiO 2 The macro-preparation method of the core-shell structure, the steps are as follows:

[0025] (1) 100 g anatase TiO 2 Add distilled water to form a suspension with a concentration of 100 g / L, add 0.3 g of (NaPO 3 ) 6 As a dispersant, stir for 30 min;

[0026] (2) Transfer the dispersed sample in step (1) to the reactor, add 0.5 mol / L sodium silicate solution and 1.5 mol / L Sulfuric acid solution, the molar ratio of sodium silicate to titanium dioxide is 1:10, the pH of the reaction system is 9.5, the dropping rate of sodium silicate solution is 1.5 mL / min, after reacting for 2 hours, aging at room temperature for 3 hours, washing with distilled water until the conductivity Less than 20 mS / m, get a certain solid-liquid ratio of SiO 2 @TiO 2 suspension storage;

[0027] (3) or the SiO of step (2) 2 @TiO 2 The suspension was dried at 105 °C for 24 h, ground into powder for storage, and @ mean...

Embodiment 2

[0029] A stable dispersed SiO with controllable photocatalytic activity 2 @TiO 2 The macro-preparation method of the core-shell structure, the steps are as follows:

[0030] (1) 100 g anatase TiO 2 Add distilled water to make a suspension with a concentration of 300g / L, add 0.5g of (NaPO 3 ) 6 As a dispersant, stir for 1h;

[0031] (2) Transfer the dispersed sample in step (1) to the reactor, add 0.5mol / L sodium silicate solution and 0.5mol / L Sulfuric acid solution, the molar ratio of sodium silicate to titanium dioxide is 1:7.5, the pH of the reaction system is 8, the dropping rate of sodium silicate solution is 1.5 mL / min, after reacting for 1 h, aging at room temperature for 2 h, washing with distilled water until the conductivity The rate is less than 20 mS / m, and a certain solid-liquid ratio of SiO 2 @TiO 2 suspension storage;

[0032] (3) or the SiO of step (2) 2 @TiO 2 The suspension was dried at 105 °C for 24 h, ground into powder for storage, and @ means coa...

Embodiment 3

[0034] A stable dispersed SiO with controllable photocatalytic activity 2 @TiO 2 The macro-preparation method of the core-shell structure, the steps are as follows:

[0035](1) 100 g anatase TiO 2 Add distilled water to form a suspension with a concentration of 500g / L, add 0.1g of (NaPO 3 ) 6 As a dispersant, stir for 2h;

[0036] (2) Transfer the dispersed sample in step (1) to the reactor, add 0.5 mol / L sodium silicate solution and 1 mol / L sulfuric acid to the reactor at the same time in a water bath at 100 °C and a stirring rate of 500 r / min solution, the molar ratio of sodium silicate to titanium dioxide is 1:15, the pH of the reaction system is 10, the dropping rate of the sodium silicate solution is 1.5 mL / min, after reacting for 3 h, aging at room temperature for 1.5 h, washing with distilled water until the conductivity Less than 20 mS / m, get a certain solid-liquid ratio of SiO 2 @TiO 2 suspension storage;

[0037] (3) or the SiO of step (2) 2 @TiO 2 The susp...

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Abstract

SiO2@TiO2 nuclear shell structure with stable dispersion and controllable photocatalysis preparing method, comprises the steps of 1, adding TiO2 to distilled water to get suspension with concentration of 100-500 g/L, adding 0.1%-0.5% (NaPO3)6 as dispersing agent, and mixing it for 0. 5- 2h; 2, heating the solution obtained from step 1 to 60- 100oC, adding sodium silicate solution and sulfuric acid solution for mixing, to make the molar ratio of sodium silicate and titanium dioxide be 1:(5-45) and reaction system's pH be 8-11, after reaction for 1-3h and ageing for 1.5- 3h at room temperature, using distilled water to clean until the conductivity is less than 20 mS/m, to get SiO2@TiO2 suspension; or drying SiO2@TiO2 suspension at 100-110 oC for at least 24h and grinding it to get SiO2@TiO2 powder.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a SiO with stable dispersion and controllable photocatalytic activity 2 @TiO 2 Core-shell structure, its preparation method and its application. Background technique [0002] TiO 2 There are mainly anatase, rutile, brookite and other crystal forms, which are widely used in industrial fields such as coatings, plastics, papermaking, printing inks, chemical fibers, rubber, cosmetics; environmental protection fields such as photocatalysts to eliminate environmental pollutants; food industry; cosmetics industry, etc. According to the "2013-2017 China's Titanium Dioxide Industry Production and Marketing Demand and Investment Forecast Analysis Report", my country's total titanium dioxide production capacity accounts for 30% of the world, and it is the world's largest titanium dioxide producer and the world's largest titanium dioxide consumer. The pure titanium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/08C02F1/30C09C1/36C09C3/04C09C3/06C09C3/12C09D7/12C02F101/38
CPCB01J21/08B01J35/004C01P2002/72C01P2006/22C02F1/30C02F2101/40C02F2305/10C09C1/3692C09C3/006C09C3/04C09C3/06C09C3/12
Inventor 张敏李璇杨建军李秋叶周长华邢晓蕾郭艳如王晓冬李小红张治军
Owner HENAN UNIVERSITY
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