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Method for removing perfluorooctanoic acid in water body by utilizing lignin-based carbon nanotubes

A technology based on carbon nanotubes and lignin, applied in the direction of carbon nanotubes, nanocarbons, chemical instruments and methods, etc., can solve the problems of low efficiency limitation, low adsorption efficiency, secondary pollution of the environment, etc., and achieve large-scale application and industrialization Prospect, effect of high adsorption capacity

Active Publication Date: 2020-05-19
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

PFOA is mainly processed by means of physical adsorption, high temperature oxidation and photolysis, but its application is also restricted by technical conditions and economic factors, such as strict reaction conditions (temperature, pressure, pretreatment and various catalysts) and high energy consumption and low efficiency severely limit the use of these methods
[0003] Adsorption is a simple, low-cost, and environmentally friendly separation method, and it is one of the most effective methods for removing PFOA. At present, most of the water extractants of PFOA are filled with porous carbon, multi-block microporous spheres, and carbon nanotube powder. Materials such as PFOA have the problem of being discarded after use, and there are problems of low adsorption efficiency and secondary environmental pollution. Therefore, it is extremely important to develop and establish a material that can continuously filter and be recycled for multiple times. Significance

Method used

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  • Method for removing perfluorooctanoic acid in water body by utilizing lignin-based carbon nanotubes
  • Method for removing perfluorooctanoic acid in water body by utilizing lignin-based carbon nanotubes
  • Method for removing perfluorooctanoic acid in water body by utilizing lignin-based carbon nanotubes

Examples

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Embodiment 1

[0028] Example 1 Method for removing perfluorooctanoic acid in water by using lignin-based carbon nanotubes

[0029] This embodiment includes the following steps:

[0030] (1) In parts by weight, fully mix 2 parts of guaiac lignin, 0.125 parts of dicyclopentadiene nickel, 0.125 parts of dicyclopentadiene iron, 0.25 parts of thiophene and 97.5 parts of methanol to obtain solution A ;;

[0031] (2) Under the protection of argon, deliver solution A at a rate of 0.1mL / min to the porous cracking tube 1 in the first high temperature zone with a temperature of 600°C, and crack guaiacol lignin into low molecular weight polyphenols Gas, this gas can form reflux at the end of porous cracking tube 1, the backflow release through porous cracking tube 1 forms stable gas and enters the second high temperature zone that temperature is 800 ℃ through the round hole 2 of porous cracking tube 1 end, and Further pyrolysis catalyzes growth to form continuous carbon nanotube aggregates, wherein t...

Embodiment 2

[0033] Example 2 The method of using lignin-based carbon nanotubes to remove perfluorooctanoic acid in water

[0034] This embodiment includes the following steps:

[0035] (1) In parts by weight, 1 part of syringyl lignin, 0.05 part of dicyclopentadiene nickel, 0.20 part of dicyclopentadiene iron, 0.25 part of thiophene and 98.5 parts of methanol were thoroughly mixed to obtain solution A;

[0036] (2) Under the protection of nitrogen, deliver solution A to the porous cracking tube 1 in the first high temperature zone at a rate of 0.05mL / min. The temperature in the first high temperature zone is 660°C, and syringyl lignin is cracked into low molecular weight and light Polyphenol gas, after the gas is released through the reflux of the porous cracking tube 1, enters the second high-temperature zone with a temperature of 900°C through the round hole 2, and further cracks and catalyzes the growth in the second high-temperature zone to form continuous particles with a diameter of...

Embodiment 3

[0038] Example 3 Method for removing perfluorooctanoic acid in water by using lignin-based carbon nanotubes

[0039] This embodiment includes the following steps:

[0040] (1) In parts by weight, fully mix 5 parts of p-hydroxyphenyl lignin, 0.005 parts of dicyclopentadiene nickel, 0.005 parts of dicyclopentadiene iron, 0.25 parts of thiophene and 94.74 parts of methanol to obtain a solution A;

[0041] (2) Under nitrogen protection, deliver solution A to the porous cracking tube 1 in the first high temperature zone at a rate of 0.08mL / min. The temperature in the first high temperature zone is 800°C, and p-hydroxyphenyl lignin is cracked into low molecular weight Light polyphenol gas, the gas is released through the reflux of the porous cracking tube 1, enters the second high temperature zone with a temperature of 1000°C through the round hole 2, and further cracks and catalyzes the growth in the second high temperature zone to form a continuous aggregates of carbon nanotubes...

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Abstract

The invention belongs to the field of water body perfluorooctanoic acid purification treatment. The invention discloses a method for removing perfluorooctanoic acid in a water body by utilizing lignin-based carbon nanotubes. The preparation method comprises the following steps: dissolving a mixture of lignin, dicyclopentadiene nickel and dicyclopentadiene iron and thiophene into a methanol solution; under the protection of inert gas, feeding the lignin to a porous cracking tube in a first high-temperature area, to pyrolyze the lignin into low-molecular light polyphenol gas; then releasing thegas into a second high-temperature area through backflow of the porous cracking tube, and further performing cracking catalytic growth is performed to form a carbon nanotube aggregate with the diameter of 10-37 nm; and then processing the carbon nanotube aggregate into the carbon nanotube filter membrane. The method is used for removing the perfluorooctanoic acid in the water body, wherein the lignin is used for preparing the carbon nano tube aggregate, and the carbon nano tube aggregate is prepared into the carbon nano tube filter membrane, so that after adsorption of the perfluorooctanoic acid is completed, the perfluorooctanoic acid can be rapidly regenerated in a high-temperature environment.

Description

technical field [0001] The invention belongs to the field of purification treatment of perfluorooctanoic acid in water, and in particular relates to a method for removing perfluorooctanoic acid in water by using lignin-based carbon nanotubes. Background technique [0002] Perfluorooctanoic acid is a highly polar organic acid with low surface tension, which is characterized by hydrophobic and oleophobic amphiphobic properties. In recent years, with the development of material technology, perfluorooctanoic acid has been widely used in surfactants , emulsifiers, detergents, packaging materials, dyeing and finishing auxiliaries and other fields. However, due to the high chemical stability of perfluorooctanoic acid, it is difficult to degrade in the natural environment, and can enter the human body through the plant ecological chain and animal food chain, which greatly endangers people's health. Therefore, PFOA has become an environmental engineering in recent years. It is one o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C01B32/16C01B32/168C02F101/34C02F101/36
CPCC01B2202/36C02F1/283C02F2101/34C02F2101/36C02F2303/16C01B32/16C01B32/168
Inventor 李登新王倩倩朱美芳相恒学周家良俞森龙
Owner DONGHUA UNIV
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