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Doped nano sensitive material for monitoring benzene

A technology of sensitive materials and benzene series, which is applied in the field of doped nano-sensitive materials, can solve the problems of measurement interference, sensitive material selectivity needs to be improved, time-consuming and difficult to realize on-site, etc.

Inactive Publication Date: 2010-05-12
BIOCHEM ENG COLLEGE OF BEIJING UNION UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The methods for the determination of benzene series mainly include gas chromatography, infrared spectroscopy, gas chromatography-mass chromatography, and spectrophotometry. Since these methods require pre-enrichment and appropriate treatment to complete the determination through large-scale analytical instruments, they are time-consuming and difficult to implement on-site
In 2006, the inventor published a paper titled "Determination of Benzene Series in the Air by Nanocomposite Catalytic Luminescence Method" on "Analytical Laboratory" using nano-scale copper-manganese-iron (atomic ratio 4:3:1) composite Oxide as a sensitive material can be detected online at 1~80mg / m 3 Benzene series, the detection limit can reach 0.5mg / m 3 , but formaldehyde, methanol, ethanol and acetone interfere with the determination of benzene series, indicating that the selectivity of sensitive materials needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (1) At room temperature, add 20g of butyl titanate to 50mL of absolute ethanol, stir well to obtain a mixed solution of butyl titanate-ethanol, and add 28mL of 1.6mol / LFe(NO 3 ) 3 Aqueous solution, continue to stir for 30min, stand and age for 6h to obtain transparent light yellow A sol; add 10g of aluminum isopropoxide to 30mL of deionized water at 80°C, hydrolyze for 1h, add 2mL of HNO with a concentration of 2mol / L 3 Solution, stirred at 80°C for 3 hours to form a transparent B sol; add A sol to B sol under high-speed stirring, and continue to stir for 3 hours to obtain a uniform mixed sol;

[0013] (2) Immerse 10g of pretreated activated carbon into the above-mentioned mixed sol, shake until no bubbles appear, filter out the activated carbon and dry it in an 80°C drying oven. After fully grinding, put it in a 460°C muffle furnace Roasting for 4h to get TiO 2 , Fe 2 o 3 and Al 2 o 3 Nano powder;

[0014] (3) Dissolve 10g of silver nitrate and 10g of glucose in...

Embodiment 2

[0018] (1) At room temperature, add 20g of butyl titanate to 50ml of absolute ethanol and stir evenly to obtain a titanium-ethanol mixed solution. Under high-speed stirring conditions, slowly add 1.6mol / L FeCl 3 and 1.8mol / L Al(NO 3 ) 3 30ml of aqueous solution, continue to stir for 20min, let stand and age for 7h, and obtain a transparent light yellow sol;

[0019] (2) Immerse 10g of pretreated activated carbon into the above-mentioned mixed sol, shake until no bubbles appear, filter out the activated carbon and dry it in an 80°C drying oven. After fully grinding, put it in a 480°C muffle furnace Roasted for 3h to get TiO 2 , Fe 2 o 3 and Al 2 o 3 Nano powder;

[0020] (3) 10g of silver nitrate and 10g of glucose were dissolved in 100ml of pure water, and under continuous stirring, all the above-mentioned nano powders dispersed by ultrasonic waves were added therein, continued to stir and mix evenly, and were directly placed in a drying oven to dry at 190 ℃ and heated...

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Abstract

The invention relates to a doped nano sensitive material for monitoring benzene, which is characterized in that: the doped nano sensitive material consists of Ag atom-doped TiO2, Fe2O3 and Al2O3 powder, wherein the content ranges of the components are that: the content range of Ag is 10 to 12 percent, the content range of TiO2 is 30 to 40 percent, the content range of Fe2O3 is 25 to 35 percent, and the content range of Al2O3 is 15 to 25 percent; and the grain diameter is less than 30nm. Benzene sensors prepared from the sensitive material provided by the invention have wide linear range, goodselectivity and high sensitivity, can monitor micro benzene in the air on line, and are not influenced by coexisting substances.

Description

technical field [0001] The invention relates to a doped nano-sensitive material for monitoring benzene series, especially TiO doped by Ag atoms 2 , Fe 2 o 3 and Al 2 o 3 A sensitive material composed of nanometer powder belongs to the field of sensing technology. Background technique [0002] Benzene series generally refer to volatile organic compounds such as benzene, toluene, ethylbenzene, xylene (ortho, meta and para), cumene and styrene, especially benzene, toluene and (o, meta and para) in the air. Para)xylene is the most common, and benzene series have been identified as strong carcinogens by the World Health Organization. The benzene series in the air mainly come from architectural coatings, decorative paints, adhesive solutions and automobile exhaust. Benzene series is one of the main pollutants in indoor air, which poses a great threat to human health. Chronic benzene series poisoning is mainly irritating to the skin, eyes and upper respiratory tract; frequen...

Claims

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Application Information

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IPC IPC(8): G01N33/00
Inventor 周考文张鹏佟岳
Owner BIOCHEM ENG COLLEGE OF BEIJING UNION UNIV
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