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AgNPs@ nitrogen-containing two-dimensional pi-conjugation metal organic frame composite for detecting hexavalent chromium

A metal-organic framework and composite material technology, which is applied in the field of AgNPs@nitrogen-containing two-dimensional π-conjugated metal-organic framework composite materials, can solve the problems of inability to achieve on-site instant detection, high cost, and complicated hexavalent chromium detection operation , to achieve the effect of good electron conductivity, simple method and mild conditions

Inactive Publication Date: 2016-08-17
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Atomic absorption spectrometry, atomic emission spectrometry, ultraviolet-visible spectrophotometry, mass spectrometry, and chromatography are complicated to detect hexavalent chromium, and the cost is high, and the samples need to be pre-treated, so on-site instant detection cannot be achieved

Method used

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  • AgNPs@ nitrogen-containing two-dimensional pi-conjugation metal organic frame composite for detecting hexavalent chromium
  • AgNPs@ nitrogen-containing two-dimensional pi-conjugation metal organic frame composite for detecting hexavalent chromium
  • AgNPs@ nitrogen-containing two-dimensional pi-conjugation metal organic frame composite for detecting hexavalent chromium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Preparation of silver nanoparticles. Prepare 0.002M silver nitrate solution and 0.003M sodium borohydride solution. Add 0.003M sodium borohydride into a three-necked round bottom flask, place in an ice-water bath and stir vigorously; slowly add 0.002M silver nitrate to twice the volume of 0.003M sodium borohydride, and stir vigorously for 5 minutes after silver nitrate is completely added. Move the solution into a hot water bath at 100 degrees Celsius, heat for 1 to 2 minutes, immediately quickly add the reserved 20ml sodium borohydride solution, and stir vigorously for 2 minutes; remove the flask from the hot water bath, continue stirring vigorously to cool to room temperature, and transfer to the Store in a brown bottle soaked in aqua regia at 4°C.

[0049] Preparation of nitrogen-containing two-dimensional π-conjugated metal-organic frameworks. Soak two 50mL beakers with aqua regia, rinse with secondary water after overnight. Add 5 mL of deionized water to the bea...

Embodiment 2

[0054] Other steps are all identical with embodiment, only cobalt sulfate heptahydrate (CoSO 4 ·7H 2 O) was replaced by cobalt chloride. The reaction temperature, reaction time and reactant ratio can be properly adjusted.

Embodiment 3

[0056] Other steps are all identical with embodiment, only cobalt sulfate heptahydrate (CoSO 4 ·7H 2 O) was replaced by cobalt nitrate.

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Abstract

The invention discloses an AgNPs@ nitrogen-containing two-dimensional pi-conjugation metal organic frame composite for detecting hexavalent chromium. An alkaline solution is added to a mixed solution of hexa-amino triphenylene and cobalt salt, after a reaction, obtained sediment is washed and dried, a nitrogen-containing two-dimensional pi-conjugation metal organic frame material Co3HITP2 is obtained, and the composite can be prepared after a reaction between the organic frame material and nano silver particles. An electrochemical sensor is used for detecting hexavalent chromium, and the advantages of being simple in method, mild in condition, easy to control, low in cost and capable of achieving immediate and rapid field detection are achieved.

Description

technical field [0001] The invention relates to the technical field of electrochemical detection, in particular to an AgNPs@nitrogen-containing two-dimensional π-conjugated metal-organic framework composite material for detecting hexavalent chromium. Background technique [0002] Metal-organic frameworks (MOFs) are a class of supramolecular crystal materials with nanoholes that are connected by metal ions (clusters) and organic bridging ligands. They have the advantages of large specific surface area, good thermal and chemical stability, especially the adjustable pore size and topology, which can effectively identify target molecules with different radii or volumes, making them good in chemical sensing. Application prospect. [0003] Nitrogen-containing planar two-dimensional π-conjugated MOFs materials are a class of high-conductivity MOFs materials designed and prepared by selecting appropriate ligands and metals. Composed of a variety of post-transition metal nodes, the...

Claims

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Application Information

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IPC IPC(8): C07F15/06G01N27/30G01N27/32G01N27/48
CPCC07F15/065G01N27/30G01N27/32G01N27/48
Inventor 朱浩天夏建飞曹喜玥
Owner QINGDAO UNIV
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