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Method for preparing anionic colorimetric sensing cellulosic material

A colorimetric sensing, cellulose technology, applied in fiber processing, plant fiber, analysis by chemical reaction of materials, etc. Simple, Inexpensive Effects

Inactive Publication Date: 2010-10-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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) Vázquez, M.; Fabbrizzi, L.; Taglietti, A.; Pedrido, R.M.; González-Noya, A.M.; Bermejo, M.R. Angew .Chem.Int.Ed.2004, 43, 1962-1965.(b) Jose, D.A.; Kumar, D.K.; Ganguly, B.; Das, A.Org.Lett.2004, 6, 3445-3448], but because It cannot be used in aqueous solution systems, or has a large dependence on the pH of the solution, making it difficult to popularize and use
At present, some materials that can be used for colorimetric sensing of fluoride ion in aqueous solution have been successfully synthesized [Palomares.E.; Vilar, R.; Green, A.; Durrant, J.R.Adv.Funct.Mater.2004, 14, 111-115], however, due to the limitation of the specific surface area, the sensitivity of this material is low, and it can only detect fluoride ions at micromolar concentrations

Method used

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  • Method for preparing anionic colorimetric sensing cellulosic material
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  • Method for preparing anionic colorimetric sensing cellulosic material

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Embodiment 1

[0031] Embodiment 1: Prepare anionic colorimetric sensing cellulose material with the method provided by the present invention, and use this material to sense fluoride ions in aqueous solution:

[0032] Firstly, the anionic colorimetric sensing cellulose material in the present invention is prepared.

[0033] 1) Prepare a 100 mM tetrabutyl titanate solution in a solvent of toluene / ethanol (v:v=1:1), and stir at room temperature for 1 hour.

[0034] 2) Put ordinary quantitative filter paper in a suction filter device, rinse with ethanol for 2 to 3 times, and drain 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, so that tetrabutyl titanate is deposited on the filter paper fiber.

[0035] 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 ethanol to rinse for 2 to 3 times, and let stand for 2 ...

Embodiment 2

[0043] 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:

[0044] Firstly, the anionic colorimetric sensing cellulose material in the present invention is prepared.

[0045] According to the preparation method and steps of Example 1, an anion colorimetric sensing cellulose material modified with alizarin complexing agent AC molecular monolayer was obtained, and it was used for the detection of other anions.

[0046] Put the self-assembled alizarin complexing agent AC molecular monolayer anion colorimetric sensing cellulose material in 1mM aqueous solution of different anions (chloride ion, bromide ion, acetate ion, carbonate ion) for 5 minutes, after taking out Physically adsorbed anions were removed by washing with water, and dried at room temperature. It can be found that even when the concentration of other anions is as high as 1 mM, it sti...

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Abstract

The invention discloses a method for preparing an anionic colorimetric sensing cellulosic material. A titanium dioxide film is deposited on the surface of filter paper cellulose by taking natural cellulose fiber material as a matrix, and taking tetrabutyl titanate as a precursor by a surface sol-gel process; a fluoride ion colorimetric sensing cellulosic material is obtained by introducing a fluoride ion-sensitive ligand alizarin complexant molecule single layer in a self-assembly way; and fluoride ions in solution can be detected by infiltrating the material prepared by the invention in the aqueous solution of anions for a certain period of time simply, and observing the color change of the material. The anionic colorimetric sensing cellulosic material prepared by the invention has the advantages of high sensitivity and selectivity to the fluoride ions, abundant material sources, low cost, simple preparation method and simple, rapid and economic fluoride oil detection.

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 fluoride 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 the many anions, fluoride ion has received special attention due to its significant role in dental health care, osteoporosis treatment and other fields. However, excessive intake of fluoride ions will cause fluorosis, which is mainly manifested clinically as changes in bone density. Therefore, the detection and sensing of fluoride ions is very important. At present, many chemical methods have been used for anion sensing, mainly including colorimetric methods, fluorescence methods, electrochemical me...

Claims

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Application Information

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IPC IPC(8): D06M11/46D06M13/328G01N21/78D06M101/06
Inventor 黄建国张学海
Owner ZHEJIANG UNIV
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