Preparation method and application of nitrogen-doped carbon-magnesium composite nano-sheet

A technology of nitrogen doping and nanosheets, which is applied in chemical instruments and methods, catalyst activation/preparation, alkali metal compounds, etc., can solve the problems of photocatalytic activity that needs to be further improved, and solve the problem of difficult collection, improve adsorption capacity, low cost effect

Inactive Publication Date: 2018-06-15
NEIJIANG NORMAL UNIV
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Problems solved by technology

The inventors of the present invention have obtained carbon-magnesium nanocomposites in previous studies, and their adsorption capacity has been greatly improved, but the photocatalytic activity needs to be further improved

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preparation example Construction

[0033] The invention provides a method for preparing nitrogen-doped carbon-magnesium composite nanosheets, comprising the following six steps:

[0034] 1) Weighing a certain quality of magnesium chloride hexahydrate and surfactant 1 into ethanol aqueous solution 1 and stirring at constant temperature to form a uniform magnesium salt solution;

[0035] 2) Ammonia water with an equal stoichiometric ratio is added to the above-mentioned magnesium salt solution and continuously stirred to form a magnesium hydroxide slurry;

[0036] 3) Put the slurry into a high-temperature reactor for reaction, and after the reaction is completed, the liquid is cooled naturally, and the supernatant is removed, and washed twice with deionized water and ethanol respectively;

[0037] 4) Prepare a slurry solution with ethanol aqueous solution 2, add cyanamide and surfactant 2 according to the formula ratio and stir at constant temperature;

[0038] 5) After stirring evenly, put it into a high-pressu...

Embodiment 1

[0055] Weigh 2.6g of magnesium chloride hexahydrate and 1.0g of polyvinylpyrrolidone (Mw=58000) into 50mL of 20% ethanol solution, and stir at a temperature of 25°C and a stirring speed of 400r / min for 20min to form a magnesium salt solution. 3mL ammonia solution (analytical grade, NH 3 ·H 2 O content 15%-28%) was added to the magnesium salt solution at a constant speed, and stirred at a constant temperature for 60 minutes at a temperature of 25° C. and a stirring speed of 450 r / min to form a magnesium hydroxide slurry. Put the slurry into a high-temperature reactor and react at 170°C for 10 hours. After natural cooling, remove the supernatant, and wash twice with deionized water and ethanol respectively; For the slurry solution, add 12mL cyanamide and 1.5g polyvinylpyrrolidone (Mw=58000) to the above slurry solution, and stir at a temperature of 25°C and a stirring speed of 500r / min for 120min to form a magnesium amine slurry. Put the slurry into an autoclave and react at 2...

Embodiment 2

[0057] Weigh 5.1g of magnesium chloride hexahydrate and 1.0g of polyvinylpyrrolidone (Mw=58000) into 80mL of 50% ethanol solution, and stir at a constant temperature of 25°C and a stirring speed of 600r / min for 30min to form a magnesium salt solution. 5mL ammonia solution (analytical grade, NH 3 ·H 2 O content 15%-28%) was added to the magnesium salt solution at a constant speed, and stirred at a constant temperature for 80 minutes at a temperature of 25° C. and a stirring speed of 600 r / min to form a magnesium hydroxide slurry. Put the slurry into a high-temperature reactor and react at 170°C for 10 hours. After natural cooling, remove the supernatant, and wash twice with deionized water and ethanol; use 120mL of 50% ethanol solution to prepare 8g / L For the slurry solution, add 8 mL of cyanamide and 1.5 g of polyvinylpyrrolidone (Mw=58000) to the above slurry solution, and stir at a temperature of 25° C. and a stirring speed of 500 r / min for 120 min to form a magnesium amine...

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Abstract

The invention discloses a preparation method and application of a nitrogen-doped carbon-magnesium composite nano-sheet. According to the method disclosed by the invention, magnesium chloride hexahydrate, ammonia water and cyanamide are used as raw materials, an ethanol water solution is used as a solvent and polyvinylpyrrolidone 58000 is used as a bridging agent to prepare the nitrogen-doped carbon-magnesium composite nano-sheet. The material is a nano-sheet with a sandwich structure, which is formed by compounding sheet-shaped MgO and nitrogen-doped activated carbon. The nitrogen-doped carbon-magnesium composite nano-sheet has the advantages of light weight, good adsorption performance, easiness for recycling and high photocatalytic degradation efficiency in the aspect of environment pollution management, especially water treatment; industrial application of an inorganic nano-material in the technical field of the water treatment is broken through.

Description

technical field [0001] The invention belongs to the field of preparation of environment-friendly materials, and in particular relates to a preparation method of nitrogen-doped carbon-magnesium composite nanosheets with functions of adsorption and photocatalytic degradation, and its application in treating environmental pollutants. Background technique [0002] With the development of modern industry and agriculture, a large number of toxic, harmful and refractory organic pollutants (such as chlorophenols, pesticides, antibiotics, endocrine disruptors, etc.) have entered the water environment, threatening human health and survival. Substances are difficult to remove and degrade during conventional water treatment. [0003] For such pollutants, semiconductor photocatalytic oxidation technology, as an economical, safe and efficient advanced oxidation technology, has attracted extensive attention of researchers. This technology can oxidize organic pollutants in the water enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/04B01J20/28B01J20/30B01J27/24B01J37/08C02F1/28C02F1/30
CPCB01J20/041B01J20/205B01J20/28033B01J27/24B01J35/004B01J37/082C02F1/283C02F1/30C02F2305/10
Inventor 郑小刚黄明李达伟付孝锦张金洋刘敏王福海刘勇
Owner NEIJIANG NORMAL UNIV
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