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Preparation method of MOF (metal-organic framework)-derived cobalt/carbon nanocomposite

A technology of metal-organic frameworks and composite materials, which is applied in the field of preparation of cobalt/carbon nanocomposites, can solve the problems of high reaction temperature, reaction time, unfavorable large-scale industrial production of MOF precursors, etc., and achieve easy removal and excellent selectivity Adsorption performance, easy operation effect

Inactive Publication Date: 2018-06-19
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the above methods, the preparation of metal organic framework precursors requires the use of toxic and harmful organic solvents such as methanol and DMF, high reaction temperature or long reaction time and other reaction conditions, which is not conducive to the large-scale industrialization of MOF precursors. Production

Method used

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  • Preparation method of MOF (metal-organic framework)-derived cobalt/carbon nanocomposite
  • Preparation method of MOF (metal-organic framework)-derived cobalt/carbon nanocomposite
  • Preparation method of MOF (metal-organic framework)-derived cobalt/carbon nanocomposite

Examples

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Embodiment 1

[0027] A method for preparing a cobalt / carbon composite material derived from a metal organic framework, specifically comprising the following steps:

[0028] (1) Dissolve 0.484g 4,4′-biphenyldicarboxylic acid and 0.224g KOH in 25mL water to make a solution, dissolve 0.582g cobalt nitrate hexahydrate in 25mL water to make a solution, and then put the two solutions at room temperature Mix and stir for 0.5 hours at a stirring speed of 500r / min, then perform centrifugal washing at a rotational speed of 8000r / min, put them in an oven, and dry at 70°C for 5 hours to obtain a cobalt-based metal-organic framework precursor;

[0029] (2) Put the precursor obtained in step (1) into a quartz boat, use nitrogen as a protective gas in a tube furnace, heat up to 900°C at a heating rate of 5°C / min, keep it for 3 hours and start to cool down, After cooling to room temperature, the black cobalt / carbon nanocomposite material was obtained.

[0030] figure 1 The X-ray powder diffraction (XRD) ...

Embodiment 2

[0033] (1) Dissolve 0.414g of 1,3,5-benzenetricarboxylic acid and 0.24g of NaOH in 50mL of water to form a solution, and dissolve 0.714g of cobalt chloride hexahydrate in 50mL of water to form a solution. Mix and stir at room temperature for 1 hour at a stirring speed of 800r / min, then perform centrifugal washing at a rotating speed of 10000r / min, then put it in an oven, and dry at 80°C for 5 hours to obtain a Co-BTC precursor;

[0034] (2) Put the precursor obtained in step (1) into a quartz boat, use nitrogen as a protective gas in a tube furnace, heat up to 800°C at a heating rate of 5°C / min, keep it for 3 hours and start to cool down, After cooling to room temperature, the black magnetic cobalt / carbon composite was obtained.

[0035] figure 2 The X-ray powder diffraction (XRD) spectrum of the cobalt-based metal-organic framework precursor prepared for this embodiment, from figure 2 It can be seen from the figure 2 The XRD patterns of simulated Co-BTC in b are consist...

Embodiment 3

[0040] The specific experimental procedure of the present embodiment is the same as in Example 1, except that 0.582g of cobalt nitrate hexahydrate is changed to 0.498g of cobalt acetate tetrahydrate.

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Abstract

The invention provides a preparation method of an MOF (metal-organic framework)-derived cobalt / carbon nanocomposite. The method comprises the following steps: dissolving biphenyl-4,4'-dicarboxylic acid or trimesic acid in an aqueous solution containing potassium hydroxide or sodium hydroxide, adding an aqueous solution of a soluble cobalt salt, performing mixing and stirring at room temperature for a reaction, and performing centrifugal washing and drying to obtain a cobalt-based MOF precursor; calcining the obtained precursor in a nitrogen or argon atmosphere to obtain the cobalt / carbon nanocomposite. The preparation method of the cobalt-based MOF precursor has the advantages of being operated at room temperature, saving energy, adopting water as a solvent and being environmentally friendly; the synthesized magnetic cobalt / carbon nanocomposite has excellent selective adsorption capacity on triphenylmethane dyes and can be separated simply and rapidly by means of the magnetism.

Description

technical field [0001] The invention relates to the technical field of preparation of cobalt / carbon nanocomposite materials, in particular to a method for preparing cobalt / carbon nanocomposite materials by using metal organic framework materials as precursors. Background technique [0002] Cobalt / carbon nanocomposites have received increasing attention in recent decades because of their applications in sensing, microwave absorption, supercapacitors, adsorption, catalysis, and many other fields. Traditional synthesis techniques of cobalt / carbon nanocomposites include chemical vapor deposition, arc discharge, and plasma evaporation. However, these synthesis techniques have disadvantages such as complex process, harsh synthesis conditions, high cost, and cumbersome operation, which limit their large-scale production and application. [0003] Metal-organic framework materials usually refer to a class of crystalline materials with periodic network structure and porous characteri...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28C02F1/28C02F101/30
CPCB01J20/226B01J20/28009C02F1/285C02F2101/308
Inventor 靳黎娜赵小霜钱昕晔董明东
Owner JIANGSU UNIV
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