Nitrogen-doped magnetic porous carbon material as well as preparation method and application thereof

A technology of porous carbon materials and nitrogen doping, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problem of low dye adsorption performance, achieve fast adsorption rate and easy operation , the effect of super high adsorption capacity

Inactive Publication Date: 2019-03-22
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of porous organic polymers to synthesize magnetic porous materials and explore their dye adsorption properties is relatively seldom.

Method used

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  • Nitrogen-doped magnetic porous carbon material as well as preparation method and application thereof
  • Nitrogen-doped magnetic porous carbon material as well as preparation method and application thereof
  • Nitrogen-doped magnetic porous carbon material as well as preparation method and application thereof

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Effect test

Embodiment 1

[0055] Embodiment 1: A kind of preparation method of nitrogen-doped magnetic porous carbon material

Embodiment 2

[0059] The porous magnetic carbon material N-PMC (2.5 mg) was added to MB aqueous solutions (5 mL) of different concentrations, and the shaking was continued for 24 hours at room temperature. The adsorbed N-PMC was separated from the solution under the action of an external magnet, and the filtrate concentration was characterized by UV-Vis spectroscopy at a wavelength of 664 nm. Adsorption capacity of N-PMC for MB and its removal rate. With the increase of the initial MB concentration, the adsorption capacity of MB by N-PMC gradually increased until it remained unchanged. At lower concentrations, more adsorption sites are available. After reaching the maximum adsorption capacity with increasing concentration, MB dye molecules occupy the available sites on the N-PMC surface. Therefore, after the concentration continues to increase, the adsorption amount tends to balance. Using the Langmuir isotherm model to fit the experimental data of the isotherm, it can be seen that the l...

Embodiment 3

[0061] N-PMC (2.5 mg) was added to MB aqueous solution (5 mL) with an initial concentration of 10 ppm and shaken for different times at regular intervals. The adsorbed solution was separated from the material under the action of an external magnet, and the concentration of the filtrate was measured by UV-Vis spectroscopy. The results showed that the removal rate of MB by N-PMC was as high as 99.99% within 1 minute. Furthermore, N-PMC was able to reduce MB solutions with a concentration of 10 ppm to almost zero within 1 minute. Further, fitting the experimental data with a pseudo-second-order kinetic model, the linear correlation coefficient is very high (R 2 >0.9999), the calculated adsorption rate constant k 2 The value is 1.34g·mg·min -1 , which is more than double that of other adsorbents adsorbed by MB. The above results fully demonstrate that N-PMC has an extremely fast adsorption rate for MB adsorption.

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Abstract

The invention belongs to the technical field of chemical adsorption materials, and particularly relates to a nitrogen-doped magnetic porous carbon material as well as a preparation method and application thereof. A nitrogen-doped porous magnetic material N-PMC is successfully synthesized by utilizing a one-pot method, and the material has a relatively high specific surface area, developed porosityand a nitrogen-doped alkaline active site. The preparation method and the obtained product have the following advantages: (1) simple synthesis with the one-pot method, (2) large specific surface area, (3) ultrahigh methyl blue (MB) adsorption capacity, and (4) short adsorption time; the N-PMC has an ultrahigh MB adsorption capacity, wherein the maximum adsorption capacity is 1053.5 mg/g<-1>, andis far greater than that of an MB adsorbent reported in current literatures. In addition, the N-PMC has extremely good recyclability, and the material can be quickly separated from a solution under the action of an external magnetic field. The N-PMC is very likely to become an adsorbent, which has the broadest application prospects, for adsorbing the MB in water.

Description

technical field [0001] The invention belongs to the technical field of chemical adsorption materials, and in particular relates to a nitrogen-doped magnetic porous carbon material, one-pot synthesis of a nitrogen-doped magnetic porous carbon material, and adsorption of methyl blue. Background technique [0002] According to reports, the world has about 10 5 A variety of commercial dyes and pigments yield more than 7 x 10 5 tons of organic pollutants. Even if the concentration of organic pollutants is only 1.0 mg·L in the aqueous solution -1 , but also develops color in water, making it unfit for human consumption. Dyes are toxic and can cause serious damage to humans, such as renal dysfunction, reproductive system, brain, liver and other central nervous system damage. Therefore, removing dyes from wastewater is an urgent task. Currently, commercial activated carbon is widely used in many textile industries for the treatment of dye waste. However, activated carbon is us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28C02F1/28B01J20/30C02F101/38
CPCB01J20/20B01J20/28009C02F1/283C02F2101/38C02F2101/40
Inventor 何妍彭昌军刘洪来胡军
Owner EAST CHINA UNIV OF SCI & TECH
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