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Ptn-MxWO3/SiO2 composite aerogel and preparation method of Ptn-MxWO3/SiO2 composite aerogel

A composite airgel and composite gel technology, which is applied in the field of Ptn-MxWO3/SiO2 composite airgel and its preparation, can solve problems that have not been reported before, and achieve avoidance of uneven dispersion, high specific surface area, and broad application prospects Effect

Active Publication Date: 2020-08-28
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, Pt-M with both adsorption / photocatalysis and near-infrared shielding / thermal insulation functions is prepared by in situ synthesis process. x WO 3 / SiO 2 The study of composite airgel has not been reported yet

Method used

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  • Ptn-MxWO3/SiO2 composite aerogel and preparation method of Ptn-MxWO3/SiO2 composite aerogel
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  • Ptn-MxWO3/SiO2 composite aerogel and preparation method of Ptn-MxWO3/SiO2 composite aerogel

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preparation example Construction

[0040] A kind of Pt n -M x WO 3 / SiO 2 The preparation method of composite airgel specifically comprises the following steps:

[0041] ①Dissolve tungstate in water to obtain a tungstate solution with a concentration of 0.01-5mol / L;

[0042] ②Dissolve silicate into water to obtain a silicate solution with a concentration of 0.01-5mol / L;

[0043] ③Convert the prepared tungstate solution and silicate solution into tungstic acid solution and silicic acid solution respectively by cation exchange method, the tungstic acid solution pH=1~5, the silicic acid solution pH=1~5 6;

[0044] ④Measure a certain volume of silicic acid solution and tungstic acid solution, mix under stirring conditions, and add a certain amount of M salt, chloroplatinic acid and inducer, stir and mix evenly, and prepare a mixed sol;

[0045] ⑤Aging the mixed sol at a temperature of 20-90°C until it turns into a gel;

[0046] ⑥ Place the composite gel block in ethanol / water solution, and age at 20-60°C for...

Embodiment 1

[0065] Embodiment 1 prepares Pt 0.01 -Cs 0.5 WO 3 -5SiO 2 composite airgel

[0066] ① Preparation of silicic acid and tungstic acid solutions by ion exchange method

[0067] Preparation of silicic acid: Measure 60mL of industrial water glass with a modulus of 3.0, press V 水玻璃 :V 水 =1:4 diluted with deionized water, and then ion-exchanged through a styrene-based cation-exchange resin to obtain silicic acid with a pH of 2 to 3;

[0068] Preparation of tungstic acid: first weigh 19.791g sodium tungstate dihydrate and dissolve in 80mL deionized water to prepare Na 2 WO 4 solution, and then undergo ion exchange through a styrene-based cation exchange resin to obtain a tungstic acid solution with a concentration of 0.75mol / L and a pH of 1.5-3.

[0069] ②Preparation of mixed sol and gel

[0070] Under stirring conditions, weigh 30mL of silicic acid solution, 9.36mL of tungstic acid solution, 0.6351g of cesium sulfate, 0.915mL of 0.0772M chloroplatinic acid solution, and 9.25...

Embodiment 2

[0079] Embodiment 2 prepares Pt 0.01 -Cs 0.5 WO 3 -3SiO 2 composite airgel

[0080] ① Preparation of silicic acid and tungstic acid solutions by ion exchange method is the same as step ① in Example 1.

[0081] ②Preparation of mixed sol and gel

[0082] Under stirring conditions, weigh 20mL of silicic acid solution, 10.4mL of tungstic acid solution, 0.71g of cesium sulfate, 1.01mL of 0.0772M chloroplatinic acid solution, and 7.03g of citric acid monohydrate and mix them sequentially to prepare a mixed sol; Gel in a 60°C water bath.

[0083] ③Composite gel aging and solvothermal reaction

[0084] The obtained composite gel was aged for 24 hours at 25°C in an aqueous ethanol solution with a volume ratio of 1:1; measure 60mL of ethanol, add 3.24g of oxalic acid to make a reaction solution, put the composite gel block in the reaction solution, and heat at 190°C After 72 hours of reaction, the solvothermal reaction was completed.

[0085] ④Modification of composite gel and d...

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Abstract

The invention relates to Ptn-MxWO3 / SiO2 composite aerogel and a preparation method thereof, and belongs to the technical field of new materials and energy conservation and environmental protection. According to the Ptn-MxWO3 / SiO2 composite aerogel, the whole Ptn-MxWO3 / SiO2 composite aerogel is of a porous network structure, the specific surface area of the composite aerogel is 100-300 m<2> / g, thepore volume is 0.4-2.0 cm <3> / g, and the pore diameter is 5-25 nm; and Ptn-MxWO3 nanorod-shaped crystal grains are embedded into the composite aerogel porous network structure, and have a hexagonal tungsten bronze MyWO3 crystal structure, M in MyWO3 is Li, Na, K, Rb, Cs or NH4, y is equal to 0.2-0.7, and n is equal to 0.001-0.1. The Ptn-MxWO3 / SiO2 composite aerogel provided by the invention has visible light transmission, near-infrared shielding performance, heat insulation and pollutant adsorption / photocatalytic degradation performance at the same time.

Description

technical field [0001] The present invention relates to a Pt n -M x WO 3 / SiO 2 The composite airgel and its preparation method belong to the technical fields of new materials, energy conservation and environmental protection. Background technique [0002] With the development of society and the improvement of productivity, the energy crisis and environmental pollution are becoming more and more serious, and energy saving and consumption reduction and environmental purification are increasingly concerned by the whole society. Reducing the energy consumption of buildings is one of the main ways to save energy and reduce emissions, and windows are an important medium for indoor and outdoor energy exchange. The preparation of a transparent heat-insulating film on the surface of the glass can achieve the ideal heat-insulating performance of the glass while ensuring a certain visible light transmittance, and the photocatalytic technology of degrading pollutants through photoc...

Claims

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Application Information

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IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 史非刘敬肖杨静媛宋晓颖
Owner DALIAN POLYTECHNIC UNIVERSITY
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