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Optical pH sensor of fluorescein and sodium heptanesulfonate intercalated layered double hydroxide and preparation method thereof

A technology of sodium heptanesulfonate and ph sensor, which is applied in fluorescence/phosphorescence, testing pH value, and analysis using chemical indicators, etc. It can solve the problems of small assembly thickness and poor binding force, and achieve fast and strong film formation. Effect of force, good pH response

Inactive Publication Date: 2012-01-04
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the first two methods are limited due to their poor bonding force and small assembly thickness, respectively.

Method used

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  • Optical pH sensor of fluorescein and sodium heptanesulfonate intercalated layered double hydroxide and preparation method thereof
  • Optical pH sensor of fluorescein and sodium heptanesulfonate intercalated layered double hydroxide and preparation method thereof
  • Optical pH sensor of fluorescein and sodium heptanesulfonate intercalated layered double hydroxide and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Step A: take by weighing 15.38g Mg(NO 3 ) 2 ·6H 2 O and 11.25g Al(NO 3 ) 3 9H 2 O, Mg / Al=2, dissolved in 150ml to remove CO 2 , deionized water to prepare mixed salt solution, another 45ml NH 3 ·H 2 O Adjust the above mixed solution to pH 8.5 to obtain a slurry; place the slurry in a pressure vessel and react at 140°C for 10 h to remove CO 2 , Centrifugal washing with deionized water for 4 times to obtain a slurry; use 150ml of 2g slurry to remove CO 2 , Dispersed with deionized water, prepared into a colloidal solution, sealed and stored;

[0039] Step B: Dissolve fluorescein and sodium heptanesulfonate in deCO 2 , deionized water, respectively, the concentration is 2×10 -5 mol / l and 0.01mol / l solutions;

[0040] Step C: Take 15ml of the colloid solution prepared in step A, 10ml of the fluorescein solution prepared in step B, and 10ml of sodium heptanesulfonate solution in a four-necked bottle, add 150ml to remove CO 2 , deionized water; titrated with 0.2mo...

Embodiment 2

[0045] Step A: take by weighing 23.04g Mg(NO 3 ) 2 ·6H 2 O and 11.25g Al(NO 3 ) 3 9H 2 O, Mg / Al=3, dissolved in 150ml to remove CO 2 , deionized water to prepare mixed salt solution, another 45ml NH 3 ·H 2 O adjust the above mixed solution to pH 8 to obtain a slurry; place the slurry in a pressure vessel and react at 130°C for 10 h to remove CO 2 , Centrifugal washing with deionized water 3 times to obtain a slurry; use 160ml of 3g slurry to remove CO 2 , Dispersed with deionized water, prepared into a colloidal solution, sealed and stored;

[0046] Step B: CO removal with fluorescein and sodium heptanesulfonate 2 , deionized water, and were prepared with a concentration of 2×10 -5 mol / l and 0.01mol / l solutions;

[0047] Step C: Take 20ml of the colloid solution prepared in step A, 15ml of the fluorescein solution prepared in step B, and 15ml of sodium heptanesulfonate solution in a four-necked bottle, add 150ml to remove CO 2 , deionized water; titrated with 0.2mo...

Embodiment 3

[0052] Step A: take by weighing 17.64g Zn(NO 3 ) 2 ·6H 2 O and 11.25g Al(NO 3 ) 3 9H 2 O, Zn / Al=2, dissolved in 150ml to remove CO 2 , deionized water to prepare mixed salt solution, another 45ml NH 3 ·H 2O adjust the above mixed solution to pH 7 to obtain a slurry; place the slurry in a pressure vessel and react at 120°C for 10 h to remove CO 2 , Centrifugal washing with deionized water 3 times to obtain a slurry; use 160ml of 3g slurry to remove CO 2 , Dispersed with deionized water, prepared into a colloidal solution, sealed and stored;

[0053] Step B: Dissolve fluorescein and sodium heptanesulfonate in deCO 2 , deionized water, respectively, the concentration is 5×10 -5 mol / l and 0.02mol / l solutions;

[0054] Step C: Take 16ml of colloidal solution prepared in step A, 8ml of fluorescein solution prepared in step B, and 8ml of sodium heptanesulfonate solution in a four-necked bottle, add 150ml to remove CO 2 , deionized water; titrated with 0.2mol / l NaOH soluti...

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Abstract

The invention discloses an optical pH sensor of fluorescein and sodium heptanesulfonate intercalated layered double hydroxide and a preparation method thereof belonging to the preparation technical field of the optical pH sensor. The sensor consists of a conductive material and a surface-plating fluorescein and sodium heptanesulfonate intercalated layered double hydroxide thin film. The preparation method comprises the following steps: firstly preparing a layered double hydroxide precursor colloidal solution, and then performing an ion exchange to obtain the fluorescein and sodium heptanesulfonate intercalated layered double hydroxide colloidal solution, and finally plating to form a film on the conductive substrate through an electrophoretic deposition process. The invention has the advantages that the layered double hydroxide provides a stable and confine environment for the luminescent molecular, the electrophoretic deposition process enables the thickness of the film to be controllable from nano-order to micro-order, and the obtained highly oriented thin film facilitates the sensor to have a good pH response.

Description

technical field [0001] The invention belongs to the technical field of preparation of optical pH sensors, in particular to an optical pH sensor in which fluorescein and sodium heptanesulfonate co-intercalate hydrotalcite and a preparation method thereof. Background technique [0002] Optical sensors have attracted the attention of researchers due to their wide application in water transportation, blood testing, toxicology analysis and biotechnology. The immobilization of the fluorescent indicator is a crucial factor for the stable lifetime and signal of the optical pH sensor. Most optical pH indicators are immobilized in a suitable, proton-permeable sol-gel polymer matrix. However, the relatively high heat, photoinstability, and toxicity of the polymer itself limit the practical application of this material. Therefore, it is very important to find a matrix with high stability and good biocompatibility. [0003] At present, because the composite luminescent material combin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64G01N21/80
CPCG01N31/221
Inventor 卫敏史文颖陆军段雪
Owner BEIJING UNIV OF CHEM TECH
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