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High-specific-surface-area mesoporous aluminum gallium phosphate glass and preparation method thereof

A high specific surface area, phosphate glass technology, applied in the field of glass, can solve problems such as limiting optical applications, and achieve high stability, high glass transition temperature, and high specific surface area.

Active Publication Date: 2013-04-17
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The mesoporous materials prepared by the hydrothermal method are powders, which limits their optical applications, while the mesoporous materials with transparent optical properties prepared by the sol-gel method are mostly limited to the silicate system. The synthesis of transparent mesoporous materials in non-silicon systems has always been a challenge due to factors such as the rapid hydrolysis of silicon precursors

Method used

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  • High-specific-surface-area mesoporous aluminum gallium phosphate glass and preparation method thereof
  • High-specific-surface-area mesoporous aluminum gallium phosphate glass and preparation method thereof
  • High-specific-surface-area mesoporous aluminum gallium phosphate glass and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A total of 0.004mol of aluminum lactate 98at% and gallium nitrate 2at% were added to 16ml of deionized water, respectively, and 0.004mol of orthophosphoric acid solution was added under stirring with a magnetic stirrer. Then adjust pH=2.40 with 0.50mol / L dilute ammonia water, and then use a magnetic stirrer to stir for 2 hours. The stirred solution was transferred to a watch glass, left to stand at room temperature for 1 day, and then transferred to a 50°C oven to dry for 2 weeks. The dried samples were placed in a corundum crucible for heat treatment in a muffle furnace, heated from room temperature to 600°C, and kept at 600°C for 6 hours to obtain colorless and transparent mesoporous alumino-gallium phosphate glass. Using the Brunauer-Emmett-Teller (hereinafter referred to as BET) specific surface area measuring instrument to analyze the specific surface area of ​​the sample is 515m 2 / g, the average pore size of mesopores is 8.59 nm.

Embodiment 2

[0028] Add 0.004mol of aluminum lactate 95at% and gallium nitrate 5at% to 24ml of deionized water, respectively, and add 0.004mol of orthophosphoric acid solution under stirring with a magnetic stirrer. Then adjust pH=2.8 with 1.0mol / L dilute ammonia water, and then use a magnetic stirrer to stir for 4 hours. The stirred solution was transferred to a watch glass, allowed to stand at room temperature for 2 days, and then transferred to a 70°C oven to dry for 4 days. The dried sample is placed in a muffle furnace for heat treatment in a corundum crucible, heated from room temperature to 650°C, and kept at 650°C for 8 hours to obtain a colorless and transparent mesoporous aluminum gallium phosphate glass. Using BET specific surface area measuring instrument to analyze its components, the specific surface area of ​​the sample is 388m 2 / g, the average pore size of mesopores is 8.29 nm.

Embodiment 3

[0030] A total of 0.004mol of aluminum lactate 90at% and gallium nitrate 10at% was added to 32ml of deionized water, respectively, and 0.004mol of orthophosphoric acid solution was added under stirring with a magnetic stirrer. Then adjust pH=3.0 with 1.5mol / L dilute ammonia water, and then use a magnetic stirrer to stir for 8 hours. The stirred solution was transferred to a watch glass, allowed to stand at room temperature for 4 days, and then transferred to an 85°C oven to dry for 1 week. The dried samples are placed in a corundum crucible for heat treatment in a muffle furnace, heated from room temperature to 700°C, and kept at 700°C for 10 hours to obtain colorless and transparent mesoporous alumino-gallium phosphate glass. Analysis of 0.1Ga-0.9Al-PO with BET Surface Area Measurement Instrument 4 The specific surface area of ​​the component sample is 343m 2 / g, the average pore size of mesopores is 8.24 nm.

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Abstract

The invention relates to high-specific-surface-area mesoporous aluminum gallium phosphate glass and a preparation method thereof. The composition of the glass is xGa-(1-x)Al-PO4, wherein 0<x<0.3. The preparation method comprises the following steps: dissolving aluminum lactate, gallium nitrate and orthophosphoric acid used as precursors in deionized water, regulating the pH value to 2.00-4.00 with ammonia water, and standing to perform gelation at room temperature; and drying the gel in a baking oven at 50-100 DEG C, and then performing heat treatment in a muffle furnace at 400-800 DEG C, thus obtaining the mesoporous glass. Tests prove that the glass transition temperature Tg of the glass is not lower than 1000 DEG C, the specific surface area SBET is larger than 300 m<2> / g, and the average mesoporous diameter dp is 1.0-20.0 nm. Thus, the glass can be used as an optical gain and catalyst carrier in the field of photoelectrons.

Description

technical field [0001] The invention relates to glass, in particular to a high specific surface area mesoporous aluminum gallium phosphate glass and a preparation method thereof. Background technique [0002] Mesoporous materials have a series of unique properties, such as high specific surface area, large and continuously adjustable pore size, etc., which have been widely studied and applied in the fields of chemical industry, medicine, environmental protection, nano-functional materials and so on. The mesoporous materials prepared by the hydrothermal method are powders, which limit their application in optics, while the mesoporous materials with transparent optical properties prepared by the sol-gel method are mostly limited to the silicate system. The synthesis of transparent mesoporous materials in non-silicon systems has always been a challenge due to factors such as too fast hydrolysis of silicon precursors. [0003] Mesoporous Materials of Aluminum Phosphate-Based Sy...

Claims

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Application Information

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IPC IPC(8): C03C3/16
Inventor 张龙何进李日红王焱
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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