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Freeze-drying type TiO2/SiO2 photocatalytic composite powder and preparation method thereof

A freeze-drying and composite powder technology is applied in the field of photocatalytic materials to achieve the effects of uniform particle size distribution, low price and high purity

Active Publication Date: 2015-07-15
重庆中防德邦防水技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no use of freeze-drying treatment and silicon powder and TiO 2 TiO powder as the main raw material 2 / SiO 2 composite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Freeze-dried TiO 2 / SiO 2 Photocatalytic composite powder and preparation method thereof, comprising 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] Add 0.05% sodium hexametaphosphate (SHMP) and 0.1% polyethylene glycol 2000 to a certain concentration of nano-sol A, and add nano-TiO 2 According to the ratio of Si:Ti =1:7, the powder is made of nano-TiO 2 The powder was added to sol A and the ...

Embodiment 2

[0028] Freeze-dried TiO 2 / SiO 2 Photocatalytic composite powder and preparation method thereof, comprising the following steps:

[0029] 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;

[0030] 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;

[0031] Add 0.1% sodium hexametaphosphate (SHMP) and 0.2% polyethylene glycol 4000 to a certain concentration of nano-sol A with a mass ratio of 0.1% of sol A, and add nano-TiO 2 According to the ratio of Si:Ti=1:5, the nano-TiO2 The powder was added to sol A and...

Embodiment 3

[0034] Freeze-dried TiO 2 / SiO 2 Photocatalytic composite powder and preparation method thereof, comprising the following steps:

[0035] 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 and stir quickly and slowly raise the temperature to 85°C. Sodium silicate and 1% ammonia water mixed aqueous solution 50g in mass concentration;

[0036] 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;

[0037] Add 0.1% sodium hexametaphosphate (SHMP) and 0.4% polyethylene glycol 6000 to a certain concentration of nano-sol A with a mass ratio of 0.1% of sol A, and add nano-TiO 2 According to the ratio of Si: Ti = 1: 3, the nano-TiO 2 The powder was added to sol A and the nano-TiO 2 The powder was subjected to ultra...

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Abstract

The present invention discloses freeze-drying type TiO2 / SiO2 photocatalytic composite powder and a preparation method freeze-drying method thereof, and belongs to the technical field of photocatalytic materials. According to the present invention, elemental silicon powder is adopted as a main reactant, sodium silicate and ammonia water are adopted as catalysts, a reaction is performed under a hydrothermal condition, cooling and suction filtration are performed to prepare a nanometer SiO2 sol A, the nanometer SiO2 sol A is adopted as a dispersing liquid, polyethylene glycol (PEG) and sodium hexametaphosphate (SHMP) are adopted as dispersing agents, nanometer TiO2 is subjected to an ultrasonic treatment for a certain time at a certain ultrasonic power and a certain temperature to obtain a uniformly-distributed composite pre-dispersing liquid B, the composite pre-dispersing liquid B is placed into a freeze-drying machine to dry at a certain condensation speed at a set temperature under a set vacuum degree, and the dried powder is subjected to 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 composite powder prepared by using the freeze-drying method has characteristics of uniform component, particle size of 0.1-0.5 [mu]m, high purity, and high yield.

Description

technical field [0001] The invention discloses a freeze-dried TiO 2 / SiO 2 The photocatalytic composite powder and its preparation method—freeze drying method belong to the technical field of photocatalytic materials. Background technique [0002] TiO 2 With the advantages of non-toxicity, high stability, excellent optical properties and high catalytic activity, it is widely used, but TiO 2 The larger forbidden band width makes the utilization rate of sunlight lower. On the other hand, TiO 2 It is susceptible to contamination during use, resulting in decreased activity or even disappearance. while TiO 2 / SiO 2 Composite materials have good surface activity, insulation, good transparency and high photocatalytic activity, which can effectively solve the above problems. [0003] Currently preparing TiO 2 / SiO 2 The methods of composite materials include co-precipitation method, sol-gel method, vapor deposition method, etc., but in the above methods, TiO 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/08B01J37/32
Inventor 曹雪娟陈晨唐伯明刘唐志何丽红郭鹏邹晓翎
Owner 重庆中防德邦防水技术有限公司
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