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Preparation method of nano tin dioxide with large specific surface area

A nano-tin dioxide, large specific surface area technology, applied in tin oxide and other directions, can solve the problems of complex process and low specific surface area

Active Publication Date: 2021-04-27
GUANGXI CRYSTAL UNION PHOTOELECTRIC MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing nano-tin dioxide with large specific surface area, which has low cost, simple production process, easy operation, safety and pollution-free, to solve the problem of complex process and specific surface area of ​​common tin dioxide in the prior art. generally low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method of nano tin dioxide with large specific surface area, comprising the steps of:

[0031] S1: Dissolving: dissolving analytically pure tin tetrachloride pentahydrate in pure water to obtain a tin tetrachloride solution with a concentration of 3mol / L;

[0032] S2: Precipitation: Add sodium bicarbonate to the above solution, control the reaction temperature to 60°C, and the reaction time to 30 minutes, and keep stirring at a stirring speed of 50 r / min until the precipitation is complete, and control the pH value of the feed solution to 6.5;

[0033] S3: Transformation: add ammonia water to the above feed liquid, control the pH value of the feed liquid to 9.0, raise the temperature to near boiling at a heating rate of 5°C / min, and then keep warm for 20 min;

[0034] S4: neutralization: adding acetic acid to the above feed liquid, controlling the pH of the feed liquid to be 6.5;

[0035] S5: Cleaning, filtering, and drying: The liquid-solid separation of...

Embodiment 2

[0038] A preparation method of nano tin dioxide with large specific surface area, comprising the steps of:

[0039]S1: Dissolving: dissolving analytically pure tin tetrachloride pentahydrate in pure water to obtain a tin tetrachloride solution with a concentration of 4mol / L;

[0040] S2: Precipitation: Add ammonium bicarbonate to the above solution, control the reaction temperature to 70°C, and the reaction time to 40 minutes, and keep stirring at a stirring speed of 80 r / min until the precipitation is complete, and control the pH value of the feed solution to 7.0;

[0041] S3: Transformation: add ammonia water to the above-mentioned feed liquid, control the pH value of the feed liquid to 9.5, heat up to near boiling at a heating rate of 8°C / min, and then keep warm for 30 min;

[0042] S4: Neutralization: Add acetic acid to the above-mentioned feed liquid, and control the pH to 7.0;

[0043] S5: Cleaning, filtering, and drying: The liquid-solid separation of the above-mention...

Embodiment 3

[0046] A preparation method of nano tin dioxide with large specific surface area, comprising the steps of:

[0047] S1: Dissolving: dissolving analytically pure tin tetrachloride pentahydrate in pure water to obtain a tin tetrachloride solution with a concentration of 5mol / L;

[0048] S2: Precipitation: Add potassium bicarbonate to the above solution, control the reaction temperature to 80°C, and the reaction time to 50 minutes, and keep stirring at a stirring speed of 100 r / min until the precipitation is complete, and control the pH value of the feed solution to 7.5;

[0049] S3: Transformation: add ammonia water to the above-mentioned feed liquid, control the pH value of the feed liquid to 10.0, heat up to near boiling at a heating rate of 10°C / min, and then keep warm for 30 min;

[0050] S4: Neutralization: add acetic acid to the above-mentioned feed liquid, and control the pH to 7.5;

[0051] S5: Cleaning, filtering, and drying: the liquid-solid separation of the feed liq...

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PUM

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Abstract

The invention relates to a preparation method of nano tin dioxide with large specific surface area, which comprises the following steps: dissolving analytically pure tin tetrachloride pentahydrate in pure water to obtain a tin tetrachloride solution with the concentration of 3-5mol / L; adding a precipitant, and controlling the reaction temperature to be 60-80 DEG C and the pH value of the reaction solution to be 6.5-7.5; adding a transforming agent, controlling the pH value of the feed liquid to be 9.0-10.0, heating to be close to boiling, and keeping the temperature for 20-30 minutes; adding a neutralizer, and controlling the pH value of the feed liquid to be 6.5-7.5; cleaning, filtering and drying; and decomposing, cooling, crushing and screening to obtain the product. The preparation method is wide in raw material source, simple in process, mild in reaction condition, safe and free of pollution, the purity of the prepared nano tin dioxide exceeds 99.995%, the particle size is 8-10 nm, the specific surface area exceeds 65 m < 2 > / g and reaches 100 m < 2 > / g at most, and the requirements of gas sensitive materials with higher sensitivity can be met.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a method for preparing nano tin dioxide with a large specific surface area. Background technique [0002] Tin dioxide (SnO 2 ) is an n-type metal oxide semiconductor with abundant raw materials, low price, non-toxicity and wide bandgap (Eg=3.60eV). Due to its potential application prospects in many fields, such as optical waveguides, solar cells, transistors and gas sensors, tin dioxide is attracting widespread attention from scientists, and one of the most important uses is to make gas sensors for gas sensors . SnO 2 As a common oxide semiconductor, its microscopic action mechanism is mainly caused by the surface desorption of particles in the ambient atmosphere. The larger the specific surface of the particle, the higher the sensitivity. 2 It becomes an effective way to improve its gas sensitivity. [0003] At present, there are many synthetic routes to pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/02
CPCC01G19/02
Inventor 王凯郑飞雄张倍维梁盈祥宋春华黄作
Owner GUANGXI CRYSTAL UNION PHOTOELECTRIC MATERIALS CO LTD
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