Preparation of MOF-based hydroxylated magnetic nitrogen-doped carbon nanotubes, and uses in detection of auxin content in tea leaves

A nitrogen-doped carbon and nanotube technology, applied in the fields of carbon nanotubes, nanocarbons, inorganic chemistry, etc., can solve the problems of poor hydrophilicity, not easy to disperse, easy to settle, etc., achieve high selectivity, enhance water solubility, The effect of stabilization of the reaction product

Inactive Publication Date: 2020-04-21
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] As an adsorption material, magnetic nitrogen-doped carbon nanotubes have the characteristics of large specific surface area, good environmental stability, easy preparation, and easy enrichment and separation. However, magnetic nitrogen-doped carbon nanotubes have poor hydrophilicity and are not easy to absorb in water. Dispersed, easy to settle

Method used

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  • Preparation of MOF-based hydroxylated magnetic nitrogen-doped carbon nanotubes, and uses in detection of auxin content in tea leaves
  • Preparation of MOF-based hydroxylated magnetic nitrogen-doped carbon nanotubes, and uses in detection of auxin content in tea leaves
  • Preparation of MOF-based hydroxylated magnetic nitrogen-doped carbon nanotubes, and uses in detection of auxin content in tea leaves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for synthesizing a hydroxylated magnetic nitrogen-doped carbon nanotube material, comprising the following steps:

[0032] 1.1 Preparation of magnetic nitrogen-doped carbon nanotube materials:

[0033] (a) Dissolve 2.0 g of 2-methylimidazole (2-MeIm) in 20 mL of methanol / ethanol mixed solution (v:v=1:1), and ultrasonically dissolve; another 1.75 g of cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) Dissolve in 20 mL methanol / ethanol mixed solution (v:v=1:1);

[0034] (b) Mix the two clear solutions, stir for 10 s, and then let stand at room temperature for 20 h;

[0035] (c) After the reaction was completed, the resulting product was washed 3 times with ethanol, centrifuged at a speed of 5000 rpm for 3 min, and the resulting product was vacuum-dried overnight at 80° C. to obtain purple ZIF-67 crystals;

[0036] (d) Put 2.0 g ZIF-67 in a tube furnace and raise the temperature to 250°C at a rate of 5 °C / min, then increase the temperature to 450 °C at a rate o...

Embodiment 2

[0042] A method for synthesizing a hydroxylated magnetic nitrogen-doped carbon nanotube material, comprising the following steps:

[0043] 1.1 Preparation of magnetic nitrogen-doped carbon nanotube materials:

[0044] (a) Dissolve 2.0 g of 2-methylimidazole (2-MeIm) in 20 mL of methanol / ethanol mixed solution (v:v=1:1), and ultrasonically dissolve; another 1.75 g of cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) Dissolve in 20mL methanol / ethanol mixed solution (v:v=1:1);

[0045] (b) Mix the two clear solutions, stir for 10 s, and then let stand at room temperature for 20 h;

[0046] (c) After completion of the reaction, the resulting product was washed 3 times with ethanol, centrifuged at a speed of 5000 rpm for 3 min, and the resulting product was vacuum-dried overnight at 80° C. to obtain purple ZIF-67 crystals;

[0047] (d) Put 2.0 g ZIF-67 in a tube furnace and raise the temperature to 250°C at a rate of 5 °C / min, then increase the temperature to 450 °C at a rate of...

Embodiment 3

[0052] A method for synthesizing a hydroxylated magnetic nitrogen-doped carbon nanotube material, comprising the following steps:

[0053] 1.1 Preparation of magnetic nitrogen-doped carbon nanotube materials:

[0054] (a) Dissolve 2.0 g of 2-methylimidazole (2-MeIm) in 20 mL of methanol / ethanol mixed solution (v:v=1:1), and ultrasonically dissolve; another 1.75 g of cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) Dissolve in 20 mL methanol / ethanol mixed solution (v:v=1:1);

[0055] (b) Mix the two clear solutions, stir for 10 s, and then let stand at room temperature for 20 h;

[0056] (c) After the reaction was completed, the resulting product was washed 3 times with ethanol, centrifuged at a speed of 5000 rpm for 3 min, and the resulting product was vacuum-dried overnight at 80 °C to obtain purple ZIF-67 crystals;

[0057] (d) Put 2.0 g ZIF-67 in a tube furnace and raise the temperature to 250°C at a rate of 5 °C / min, then increase the temperature to 450 °C at a rate of...

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Abstract

The invention belongs to the technical field of nano material preparation, and particularly relates to a preparation method and applications of MOF-based hydroxylated magnetic nitrogen-doped carbon nanotubes. The preparation method comprises the following steps: directly calcining MOF in a tubular furnace, and carrying out hydroxylation modification on the material by using a chemical means to prepare the hydroxylated magnetic nitrogen-doped carbon nanotube material. According to the invention, the preparation process is simple; the water dispersibility of the obtained hydroxylated magnetic nitrogen-doped carbon nanomaterial is improved on the basis that the structure stability, the high magnetism and the large specific surface area are still kept under the existing strong acid and alkaliconditions; and a large number of uncoordinated hydroxyl groups enable the material to have good selectivity on a carboxyl-containing target object, and when the material is used for monitoring the content change of auxin in tea leaves under the stress of heavy metals in soil, analysis and understanding of the growth mechanism of plants under the stress of heavy metals in soil are facilitated.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a method for preparing MOF-based hydroxylated magnetic nitrogen-doped carbon nanotubes and an application thereof. Background technique [0002] Auxin is the earliest discovered plant hormone, which plays an important regulatory role in the differentiation and growth of plant cells, tissues and organs, and the information exchange between plants and the environment. The basic role of auxin is to regulate cell growth and division. Through asymmetric distribution in plants, it achieves a wide range of physiological effects, such as regulating organ formation, stem elongation, main root extension and lateral root development, flower and fruit development, and response to the environment. Stimulate. External environmental signals (metal stress) and plant endogenous signals regulate the in situ synthesis, metabolism and polar transport of auxin, leading t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/281B01J20/28B01J20/30C01B32/16G01N30/06
CPCB01J20/28009B01J20/28057B01J20/281C01B2202/20C01B32/16G01N30/06G01N2030/062
Inventor 张兰陈晖郑诗颖杨江帆
Owner FUZHOU UNIV
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