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Method for preparing room-temperature chlorine gas sensitive material with porous hierarchical structure

A technology of hierarchical structure and sensitive materials, applied in the field of sensing materials, can solve the problems of limiting gas sensitivity, increasing manufacturing costs, uneven powder distribution, etc., to improve long-term work stability, reduce preparation costs, and improve impregnation rate. Effect

Inactive Publication Date: 2010-09-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, the technology is complex, and the prepared powder is often unevenly distributed, loose in structure, and does not have a fine and effective hierarchical structure, which limits the performance of gas sensitivity; on the other hand, the higher working temperature (250-350 ° C), Increases energy consumption and volume of components, thereby increasing manufacturing costs

Method used

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  • Method for preparing room-temperature chlorine gas sensitive material with porous hierarchical structure
  • Method for preparing room-temperature chlorine gas sensitive material with porous hierarchical structure
  • Method for preparing room-temperature chlorine gas sensitive material with porous hierarchical structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Rapeseed pollen is selected as the raw material for pretreatment. Rinse the pollen in absolute alcohol and let dry. The processed dried pollen was placed in 1M SnCl 4 Immerse in alcohol solution for 14 hours, filter and separate the pollen and wash with alcohol for 3 times, then place it in water to wash, filter and separate, put it in a drying oven to dry, and then put it in an oxidation furnace to heat up to 2°C / min. 600°C and keep warm for 1.5 hours for burning treatment, then stop the heat supply, take out the white powder of the burning product after the furnace cavity is naturally cooled to room temperature, and obtain a three-dimensional porous hierarchical structure composed of small grains with a size of 3.8nm. tin nanomaterials. Its microstructure is shown in figure 1 As shown, the porosity is 0.26, and the average pore size is 6.3nm. After grinding the obtained tin oxide material, make a paste with an appropriate amount of deionized water and an appropria...

Embodiment 2

[0033] Rapeseed pollen is selected as the raw material for pretreatment. Rinse the pollen in anhydrous alcohol solution, dry it in the air, place the dried pollen in 1M SnCl 4 Immerse in the alcohol solution for 14 hours, filter and separate the pollen obtained by washing with alcohol for 3 times, place it in water and adjust the pH to 8 with ammonia water, filter again to separate the pollen and dry it in a drying oven, then put it in an oxidation furnace for 2 The heating rate of °C / min is raised to 700 °C and kept for 1.5 hours for burning treatment, and the heating is stopped. After the furnace cavity is naturally cooled to room temperature, the white powder of the burning product is taken out, and the white powder of the burning product is obtained, which is composed of small grains with a size of 4.2nm. Three-dimensional porous hierarchical structure of tin oxide nanomaterials. Compared with Example 1, its microstructure shrinks, the pore wall becomes thinner and smooth...

Embodiment 3

[0035] Rapeseed pollen is selected as the raw material for pretreatment. Rinse the pollen repeatedly in alcohol and let it dry. Place the treated dried pollen in 1M SnCl 4+ CTAB alcohol solution, immersion pretreatment for 14 hours. The pollen was separated by filtration and washed with alcohol for 3 times, then placed in water for cleaning, and the pollen was separated by filtration again and put into a drying oven for drying. Put the pollen obtained above into an oxidation furnace to raise the temperature to 800°C at a heating rate of 2°C / min and keep it warm for 1.5 hours for burning treatment, stop the heat supply, and take out the burning product white powder after the furnace cavity is naturally cooled to room temperature, That is, a tin oxide nanomaterial with a three-dimensional porous hierarchical structure composed of small crystal grains with a size of 4.9 nm is obtained, and a tin dioxide gas-sensing material with a porous hierarchical structure is obtained. Its...

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Abstract

The invention relates to a method for preparing a room-temperature chlorine gas sensitive material with a porous hierarchical structure, which belongs to the technical field of sensitive materials. The method comprises the following steps of: pre-treating rape pollen as raw materials, and then dipping into precursor liquid of pink salt; hydrolyzing, drying, oxidizing and burning the rape pollen to obtain a tin oxide gas sensitive material; coating the tin oxide gas sensitive material onto a substrate surface, ageing and then making into the room-temperature chlorine gas sensitive material with a porous hierarchical structure. The invention has the advantages that the process is easy and flexible and the cost is low; the gas sensitive material with good properties can be obtained by controlling the grain size and the porous hierarchical structure of metal oxides effectively, and the prepared gas sensitive material with a porous hierarchical structure can detect low-density C12 selectively and quickly at room temperature.

Description

technical field [0001] The invention relates to a method in the technical field of sensing materials, in particular to a method for preparing a room temperature chlorine sensitive material with a porous hierarchical structure. Background technique [0002] Chlorine is widely used in industry, and more than 60% of commercial chemicals use chlorine in their production process, such as various chlorine solvents, refrigerants, dispersed propellants, detergents, disinfectants, fuels, etc. in production. On the other hand, chlorine gas is also a poisonous gas, which is irritating and corrosive, and is especially easy to damage organs such as eyes, respiratory tract and lungs. In addition, chlorine gas has strong oxidizing properties, and it can react with industrial wastewater to generate chlorinated organic compounds such as dioxin, which can be enriched through the food chain and cause great harm. Therefore, real-time and on-site monitoring of chlorine gas is very necessary. ...

Claims

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Application Information

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IPC IPC(8): G01N27/00
Inventor 苏慧兰宋钫张荻
Owner SHANGHAI JIAO TONG UNIV
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