Preparation method of nitrite ion colorimetric sensing cellulose material

A nitrite ion, colorimetric sensing technology, applied in the direction of chemical reaction of materials, material analysis by observing the influence of chemical indicators, etc., can solve the problem of inability to detect trace anions, difficult to popularize and use , low sensitivity and other problems, to achieve the effect of good selectivity, low price and high sensitivity

Inactive Publication Date: 2011-09-07
ZHEJIANG UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Although, there have been some related reports on anion colorimetric sensing in recent years [(a) [Palomares, E.; Vilar, R.; Green, A.; Durrant, J. R. Adv. Funct. Mater. 2004, 14 , 111–115. (b) Cho, E. J.; Ryu, B. J. Y.; Lee, J.; Nam, K. C. Org. Lett. , 2005, 7, 2607?2609.], but it is difficult to popularize because it cannot be used in aqueous solution system, or cannot detect trace anions
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  • Preparation method of nitrite ion colorimetric sensing cellulose material
  • Preparation method of nitrite ion colorimetric sensing cellulose material
  • Preparation method of nitrite ion colorimetric sensing cellulose material

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Embodiment 1

[0060] Embodiment 1: Prepare anionic colorimetric sensing cellulose material with the method provided by the invention, and use this material to sense nitrite ions in aqueous solution:

[0061] Firstly, the anionic colorimetric sensing cellulose material in the present invention is prepared.

[0062] 1) Prepare a 100 mM tetrabutyl titanate solution, the solvent is toluene / ethanol (v:v=1:1), and stir at room temperature for 1 hour.

[0063]2) Put ordinary quantitative filter paper (produced by Hangzhou Xinhua Co., Ltd., Zhejiang Province) in a suction filtration device, rinse it with ethanol for 2 to 3 times, and dry it with air flow. Take 10 mL of tetrabutyl titanate solution and add it to the suction filtration device, and let it stand for 3 minutes to deposit tetrabutyl titanate on the filter paper fibers.

[0064] 3) Slowly filter the tetrabutyl titanate solution under low vacuum. When the liquid level of the solution is close to the surface of the filter paper, add ethano...

Embodiment 2

[0072] Embodiment 2: Prepare anion colorimetric sensing cellulose material with the method provided by the present invention, and use this material to detect other anions in aqueous solution:

[0073] Firstly, the anionic colorimetric sensing cellulose material in the present invention is prepared.

[0074] According to the preparation method and steps of Example 1, an anion colorimetric sensing cellulose material modified with a monolayer of naphthylamine molecules was obtained, and used for the detection of other anions.

[0075] Anionic colorimetric sensing cellulose material of self-assembled naphthylamine molecular monolayer was exposed to 1 mM mixture of different anions (fluoride, chloride, bromide, acetate, nitrate) and sulfanilic acid In the aqueous solution for 15 minutes, after taking it out, wash with water to remove physically adsorbed anions, and dry at room temperature. It can be found that even when the concentration of other anions is as high as 1 mM, it stil...

Embodiment 3

[0076] Embodiment 3: Anion colorimetric sensing cellulose material is prepared by the method provided by the present invention, and this material is used to detect NO in nitrite aqueous solution containing different cations 2 ? :

[0077] Firstly, the anionic colorimetric sensing cellulose material in the present invention is prepared.

[0078] According to the preparation method and steps of Example 1, an anion colorimetric sensing cellulose material modified with a monolayer of naphthylamine molecules was obtained, and it was used for the detection of nitrite containing different cations.

[0079] The anionic colorimetric sensing cellulose material of the self-assembled naphthylamine molecular monolayer was placed in 100 μM NaNO 2 or KNO 2 and p-aminobenzenesulfonic acid mixed aqueous solution for 15 min, after taking it out, wash with water to remove physically adsorbed nitrite ions, and dry at room temperature. It can be found that after reacting with different nitrite...

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Abstract

The invention relates to a preparation method of a nitrite ion colorimetric sensing cellulose material, comprising the following steps of: depositing a titanium dioxide film on the surface of filter paper fiber by taking a natural cellulose material as a substrate and tetrabutyl titanate as a precursor and using a surface sol-gel method; and then introducing a ligand molecule monolayer sensitive to nitrite ions in a self-assembling way to obtain the nitrite ion colorimetric sensing cellulose material, wherein the nitrite ions contained in a solution can be detected by only simply soaking the nitrite ion colorimetric sensing cellulose material into an anionic water solution for certain time and observing the change of the color of the nitrite ion colorimetric sensing cellulose material by utilizing Griess reaction. The prepared nitrite ion colorimetric sensing cellulose material has excellent sensitivity and selectivity on the nitrite ions, abundant raw material sources and low price; in addition, the preparation method is simple and can realize simple, fast and economic detection of the nitrite ions.

Description

technical field [0001] The invention relates to a preparation method of an anion colorimetric sensing cellulose material, in particular to a preparation method of a surface-modified cellulose material having a colorimetric sensing effect on nitrite ions. Background technique [0002] Anions have very important applications in fields such as environmental chemistry and food science, therefore, there is increasing interest in the selective recognition and sensing of anions. Among them, nitrite ion (NO 2 ? ) is an important pollutant in the fields of food, medicine, agriculture and biology. Nitrite ions and nitrate ions are widely used in agricultural production as fertilizers, and because they can inhibit the growth of Clostridium botulinum, enhance the flavor of meat products, and have good color and color development, they are widely used in agricultural production. It is widely used in beverage and meat processing. However, once the human body ingests a large amount of ...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 黄建国张学海
Owner ZHEJIANG UNIV
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