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 manufacturing costs, and improve impregnation rate. Effect

Inactive Publication Date: 2013-02-27
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

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Rape pollen is selected as raw material for pretreatment. Rinse the pollen in absolute alcohol and dry. The treated dry pollen was placed in 1M SnCl 4 After immersion in alcohol solution for 14 hours, the pollen was separated by filtration and washed with alcohol for 3 times, then placed in water for washing, after filtration and separation, placed in a drying oven to dry, and then placed in an oxidation furnace to heat up at a heating rate of 2 °C / min. 600 ℃ and hold for 1.5 hours for burning treatment, then stop heating, and take out the burning product white powder after the furnace cavity is naturally cooled to room temperature, that is, a three-dimensional porous hierarchical structure composed of small grains with a size of 3.8 nm is obtained. Tin nanomaterials. Its microstructure is shown in figure 1 As shown, the porosity is 0.26 and the average pore size is 6.3 nm. After grinding the obtained tin oxide material, use an appropriate amount of deionized water ...

Embodiment 2

[0033] Rape pollen is selected as raw material for pretreatment. Rinse the pollen in anhydrous alcohol solution, air dry, and place the treated dry pollen in 1M SnCl 4 After immersion in alcohol solution for 14 hours, the pollen obtained by filtration and separation was washed with alcohol for 3 times, placed in water for cleaning and adjusted to pH=8 with ammonia water, filtered and separated again and put into a drying oven to dry, and then placed in an oxidation furnace with 2 The heating rate of ℃ / min was raised to 700 ℃ and kept for 1.5 hours for burning treatment, and the heating was stopped. After the furnace cavity was naturally cooled to room temperature, the white powder of the burning product was taken out, that is, small grains with a size of 4.2 nm were obtained. Three-dimensional porous hierarchical structure of tin oxide nanomaterials. Compared with Example 1, its microstructure is shrunk, the pore walls are thin and smooth, the porosity is 0.20, the average po...

Embodiment 3

[0035] Rape pollen is selected as raw material for pretreatment. Rinse pollen repeatedly in alcohol and dry. Place the treated dry pollen in 1M SnCl 4+CTAB in 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 washing, filtered and separated again and put into a drying oven to dry. The pollen obtained above was put into an oxidation furnace and heated to 800°C at a heating rate of 2°C / min and kept for 1.5 hours for burning treatment, and the heating was stopped. After the furnace cavity was naturally cooled to room temperature, the burning product white powder was taken out, That is, the 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 microstructure is further shrunk compared to Examp...

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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 gas sensitive material with a porous hierarchical structure. Background technique [0002] Chlorine has a wide range of applications in industry. More than 60% of commercial chemicals use chlorine in their production processes, such as various chlorine solvents, refrigerants, dispersing propellants, detergents, disinfectants, fuels, etc. in production. On the other hand, chlorine gas is also a toxic gas, which is irritating and corrosive, and is particularly prone to damage to the eyes, respiratory tract, lungs and other organs. In addition, chlorine has strong oxidizing properties, and it can react with industrial wastewater to generate chlorinated organic compounds such as dioxins, which can cause great harm through enrichment in the food chain. Therefore, it is very necessary to conduct real-time and on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/00
Inventor 苏慧兰宋钫张荻
Owner SHANGHAI JIAO TONG UNIV
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