Novel SiO2/TiO2 photocatalytic composite powder preparation method

A composite powder and photocatalytic technology, which is applied in the field of photocatalytic materials, achieves the effects of high purity, uniform particle size distribution, and shortened production cycle

Active Publication Date: 2015-07-15
CHONGQING JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicon powder and TiO have not been seen so far 2 SiO po

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1

[0022] A new type of SiO 2 / TiO 2 The preparation method of photocatalytic composite powder is characterized in that it comprises the following steps:

[0023] 1) Add 250g of deionized water into the three-necked flask and preheat it to 40°C, then add 25g of elemental silicon powder and 5g of sodium silicate, stir quickly and slowly raise the temperature to 90°C, and add 0.5% of mass concentration in batches during the heating process Sodium silicate and mass concentration are 50g of aqueous ammonia mixed solution;

[0024] React the above mixed solution in a water bath at 90°C for 2 hours, then cool the mixed solution to room temperature and filter it with suction to obtain nano-SiO with a mass concentration of 3.3%. 2 Sol A;

[0025] 2) Add 0.05% sodium hexametaphosphate (SHMP) and 0.05% sodium dodecyl sulfate (SDS) to a certain concentration of nano-sol A with a mass ratio of 0.05% of sol A, and then stir rapidly to prepare dispers...

Example Embodiment

[0028] Example 2

[0029] A new type of SiO 2 / TiO 2 The preparation method of photocatalytic composite powder is characterized in that it comprises the following steps:

[0030] 1) Add 250g of deionized water into the three-necked flask and preheat it to 45°C, then add 10g of elemental silicon powder and 5g of sodium silicate, stir quickly and slowly raise the temperature to 80°C, and add 5% sodium silicate in batches during the heating process Sodium silicate and mass concentration are 50g of aqueous ammonia mixed solution;

[0031] React the above mixed solution in a water bath at 80°C for 5 hours, then cool the mixed solution to room temperature and filter it with suction to obtain nano-SiO with a mass concentration of 9.7%. 2 Sol A;

[0032] 2) Add 0.1% sodium hexametaphosphate (SHMP) and 0.1% sodium dodecyl sulfate (SDS) to a certain concentration of nano-sol A with a mass ratio of 0.1% of sol A, and then stir rapidly to prepare dispersion B;

[...

Example Embodiment

[0035] Example 3

[0036] A new type of SiO 2 / TiO 2 The preparation method of photocatalytic composite powder is characterized in that it comprises the following steps:

[0037] 1) Add 250g of deionized water into the three-necked flask and preheat it to 60°C, then add 15g of elemental silicon powder and 8g of sodium silicate, stir quickly and slowly raise the temperature to 85°C, and add 3% of the mass concentration in batches during the heating process Sodium silicate and 1% ammonia water mixed aqueous solution 50g in mass concentration;

[0038] React the above mixed solution in a water bath at 85°C for 7 hours, then cool the mixed solution to room temperature and filter it with suction to obtain nano-SiO with a mass concentration of 13.2%. 2 Sol A;

[0039] 2) Add 0.1% sodium hexametaphosphate (SHMP) and 0.3% sodium dodecyl sulfate (SDS) to a certain concentration of nano-sol A with a mass ratio of sol A, and then stir rapidly to prepare dispersion...

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Abstract

The present invention discloses a novel SiO2/TiO2 photocatalytic composite powder preparation method, which comprises: adopting elemental silicon powder as a main reactant and adopting sodium silicate and ammonia water as catalysts to react under a hydrothermal condition, and carrying out cooling and suction filtration to prepare a nanometer SiO2 sol A; adopting the nanometer SiO2 sols with different concentrations as dispersing liquids and adopting sodium hexametaphosphate (SHMP) and sodium dodecyl sulfate (SDS) as dispersing agents to treat nanometer TiO2 powder for a certain time at a certain ultrasonic power and a certain frequency to obtain a uniformly-distributed composite pre-dispersing liquid; and carrying out water bath evaporation on the pre-dispersing liquid under a stirring condition, drying, compounding the nanometer TiO2 particles and the nanometer SiO2 particles during a foaming process, and finally carrying out calcination grinding to obtain the TiO2/SiO2 photocatalytic composite powder. According to the present invention, the preparation process is simple and easy to perform, the preparation period is short, and the obtained SiO2/TiO2 photocatalytic composite powder has characteristics of particle size of 0.1-3 [mu]m, high purity, and high yield.

Description

technical field [0001] The present invention relates to a novel SiO 2 / TiO 2 The invention discloses a preparation method of photocatalytic composite powder, which belongs to the technical field of photocatalytic materials. Background technique [0002] TiO 2 It is an n-type semiconductor compound with a wide band gap. It is widely used in various industries because of its non-toxic, good stability, excellent optical properties and high photocatalytic activity. It is mainly used as a white pigment and photocatalyst. However, when this material is used as a photocatalytic material, because of its large band gap, it needs high-energy ultraviolet light to excite it, so its utilization rate of sunlight is low. On the other hand, the material is susceptible to contamination during use, resulting in decreased activity or even disappearance. while SiO 2 / TiO 2 Composite materials can effectively improve the above-mentioned problems, and then expand the application of the mat...

Claims

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Application Information

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IPC IPC(8): B01J21/08B01J37/34
Inventor 唐伯明陈晨曹雪娟何丽红邹晓翎郭鹏袁颖黄蔚郝建娟
Owner CHONGQING JIAOTONG UNIVERSITY
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