F<-> colorimetric sensor and preparation method thereof

A colorimetric sensor, hydrotalcite colloid technology, applied in the direction of material analysis by chemical reaction of materials, material analysis by observing the impact on chemical indicators, etc., can solve the problem of low selectivity, high detection limit, complex method, etc. problem, to achieve the effect of low cost, long-term preservation, and prevention of agglomeration

Inactive Publication Date: 2013-08-14
BEIJING UNIV OF CHEM TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, there are few reports on the detection of fluoride ions using optical sensors.
Moreover, optical sensors using fluoresce

Method used

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  • F&lt;-&gt; colorimetric sensor and preparation method thereof
  • F&lt;-&gt; colorimetric sensor and preparation method thereof
  • F&lt;-&gt; colorimetric sensor and preparation method thereof

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Embodiment 1

[0025] a. The preparation of hydrotalcite precursor: take by weighing 15.4gMg(NO 3 ) 2 ·6H 2 O and 11.3gAl(NO 3 ) 3 9H 2 O dissolved in 30ml to remove CO 2 , deionized water to prepare a mixed salt solution; another 7.20g NaOH was dissolved in 120ml to remove CO 2 , deionized water; mix the above two solutions, and stir in a four-neck flask for 30 minutes; centrifuge and wash three times; place the slurry in a pressure vessel and react at 100°C for 24 hours; the product is used to remove CO 2 , washed 4 times with deionized water to obtain Mg-Al-NO 3 Hydrotalcite precursor, its chemical formula is: Mg 1-x al x (OH) 2 (NO 3 ) x mH 2 O, wherein x=0.33, m=0.5; take 0.1g hydrotalcite precursor and disperse it in 150ml water;

[0026] b. Prepare an aqueous solution of alizarin sodium salt with a concentration of 1.0g / 100ml, adjust the pH value to 6.8 with dilute NaOH, and store it in a volumetric flask in the dark;

[0027]c. Take a 3cm×1cm quartz piece, wash it in a...

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Abstract

The invention discloses a fluorinion (F<->) colorimetric sensor and a preparation method thereof, belonging to the technical field of preparation of colorimetric sensors. The F<-> colorimetric sensor is made of an organic-inorganic composite material. A composite film is prepared from nano hydrotalcite colloid particles with positive electricity and sodium salt guest molecules of an alizarin complexing reagent (AC) with negative electricity under the action force of electrostatic attraction by a supermolecule layer-by-layer assembling method; quick (1s) ultraviolet response of a film sensor to the F<-> with different concentrations is investigated; and desorption of the film sensor to the F<-> is realized by competitive combination of F<-> and Al<3+>, so that repeated detection of the sensor to the F<-> is further realized. A hydrotalcite laminate of the prepared F<-> colorimetric sensor is a microcosmic rigid environment, so the guest AC molecules can be dispersed to the maximum degree, the aggregation of the guest AC molecules can be effectively prevented, and therefore the optical stability and the heat stability of the AC molecules are maintained. The sensor has good selectivity to the F<-> and shows a linear relationship in a certain range, and the color change can be observed by naked eyes.

Description

technical field [0001] The invention belongs to the technical field of colorimetric sensor preparation, and in particular provides an efficient and convenient organic-inorganic composite film as a fluoride ion (F – ) colorimetric sensor and its preparation method. Background technique [0002] Colorimetry is a method that can be used without the help of spectroscopic instruments, commonly known as "naked-eye sensor". Because of its simplicity, it is widely used in practice and has attracted great attention. In recent years, many successful cases of anion detection in solution have been reported. However, the optical and thermodynamic instability of organic colorimetric indicators limit its application. Most of the indicators are immobilized by suitable permeable sol-gel polymers, but some disadvantages of the polymers themselves, such as relatively poor thermal and light stability, and toxicity, limit the application of current sensors. practical application. Therefore, o...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 卫敏贾燕坤史文颖
Owner BEIJING UNIV OF CHEM TECH
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