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SiO2 composite aerogel material loaded with photocatalyst and preparation method of SiO2 composite aerogel material

A composite aerogel, photocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to achieve the effect of high pore volume and adsorption capacity

Active Publication Date: 2015-06-10
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, SiO 2 -TiO 2 Although the composite airgel has high adsorption performance, it can only exert its high photocatalytic performance under ultraviolet light.

Method used

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  • SiO2 composite aerogel material loaded with photocatalyst and preparation method of SiO2 composite aerogel material
  • SiO2 composite aerogel material loaded with photocatalyst and preparation method of SiO2 composite aerogel material
  • SiO2 composite aerogel material loaded with photocatalyst and preparation method of SiO2 composite aerogel material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] ① Prepare silicic acid and TiCl respectively 4 Aqueous solution and tungstic acid solution.

[0072] Preparation of silicic acid: Mix 10ml of water glass and 60ml of deionized water evenly, and obtain silicic acid with pH=2-3 through ion exchange.

[0073] Prepare TiCl 4 Solution: Slowly add 250ml TiCl dropwise to 500g ice 4 solution, and then stirred for 30min, it was packed into a brown glass bottle, and its concentration was 3mol / L.

[0074] Preparation of tungstic acid: take 3.3g Na 2 WO 4 Add 20ml of deionized water to it, then add 20ml of Na 2 WO 4 The solution is ion-exchanged to obtain tungstic acid with a pH value of 1.5-3.

[0075] ② Preparation of SiO 2 Sols and gels.

[0076] Take 50ml of silicic acid and use concentrated ammonia water to adjust the pH value to about 13, then use 2.5mol / L dilute hydrochloric acid to adjust the pH value to between 7 and 8, let it stand for a while, and the silicic acid will form a gel within 5 minutes and have a cert...

Embodiment 2

[0084] Step 1., 2. are the same as Step 1. and 2. of Embodiment 1.

[0085] ③ Preparation of WO 3 -TiO 2 Sol, add 14.4ml of tungstic acid to 60ml of TiCl with a concentration of 3mol / L 4 In the solution, a white precipitate appeared, and after a period of stirring, the precipitate disappeared, forming a light yellow sol, and then continued to stir for 30 minutes; then added 30ml of concentrated ammonia water to it to promote hydrolysis.

[0086] Steps ④, ⑤, ⑥, ⑦ are the same as Steps ④, ⑤, ⑥, ⑦ of Embodiment 1.

[0087] After determination, the WO prepared by this method 3 -TiO 2 / SiO 2 The composite airgel has a specific surface area of ​​280.9m 2 / g, the pore volume is 0.65cm 3 / g, the average pore diameter is 9.38nm. The adsorption rate of Rhodamine B was 56.52% for 1 hour in the dark room, and the degradation rate of Rhodamine B within 3 hours of light was as follows: Figure 5 -e.

Embodiment 3

[0089] Step 1., 2. are the same as Step 1. and 2. of Embodiment 1.

[0090] ③ Preparation of WO 3 -TiO 2 Sol, add 14.4ml of tungstic acid to 60ml of TiCl with a concentration of 3mol / L 4 In the solution, a white precipitate appeared, and after a period of stirring, the precipitate disappeared, forming a light yellow sol, and then continued to stir for 30 minutes; then 25ml of concentrated ammonia water was added to it to promote hydrolysis.

[0091] Steps ④, ⑤, ⑥, ⑦ are the same as Steps ④, ⑤, ⑥, ⑦ of Embodiment 1.

[0092] After determination, the WO prepared by this method 3 -TiO 2 / SiO 2 The composite airgel has a specific surface area of ​​279.6m 2 / g, the pore volume is 1.18cm 3 / g, the average pore diameter is 16.84nm. The adsorption rate of Rhodamine B was 59.18% for 1 hour in the dark room, and the degradation rate of Rhodamine B within 3 hours of light was as follows: Figure 5 -d.

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Abstract

The invention relates to a SiO2 composite aerogel material loaded with a photocatalyst and a preparation method of the SiO2 composite aerogel material, and belongs to the technical field of adsorption / photocatalytic materials. The preparation method of the SiO2 composite aerogel material loaded with the photocatalyst comprises the step of preparing composite gel: dipping SiO2 gel into photocatalyst sol or solution to obtain photocatalyst / SiO2 composite gel; carrying out deposition aging treatment on the obtained photocatalyst / SiO2 composite gel by utilizing alkyl organic solvents, wherein the alkyl organic solvents are hexamethyldisiloxane, alcohol and alkane solvents, and the alkyl organic solvents are respectively hexamethyldisiloxane, alcohol (such as ethanol or isopropanol) and alkane (such as n-hexane or heptane) solvents; then carrying out surface modification and ambient pressure drying to obtain a photocatalyst / SiO2 composite aerogel material; and the prepared photocatalyst / SiO2 composite aerogel is of a mesoporous structure, with a pore diameter of 8-20 nm, a specific surface area of 200-700 m<2> / g, and a pore volume of 0.5-2.0 cm<3> / g.

Description

technical field [0001] The invention relates to a SiO loaded photocatalyst 2 A composite airgel material and a preparation method thereof belong to the technical field of adsorption / photocatalytic materials. Background technique [0002] SiO 2 Airgel has a nano-mesoporous network structure with low density, high specific surface area and high porosity, so SiO 2 Airgel has broad application prospects in thermal insulation, gas adsorption and catalyst carrier. TiO 2 With good photocatalytic activity, TiO 2 with SiO 2 Airgel Composite Preparation of SiO 2 -TiO 2 Composite airgel, which can simultaneously exert the high-efficiency adsorption of the airgel structure and TiO 2 Good photocatalytic performance. However, due to TiO 2 The higher band gap makes it have high photocatalytic efficiency only under ultraviolet light. In addition, TiO 2 The high recombination rate of photogenerated electron-hole pairs also affects the TiO 2 photocatalytic activity. Therefore, fo...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/28B01J20/30B01J23/30B01J23/745B01J23/10
Inventor 史非刘敬肖王晓卡胡世成
Owner DALIAN POLYTECHNIC UNIVERSITY
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