A modified carbon nanotube and its preparation method and application

A technology of carbon nanotubes and nanotubes, applied in the field of modified carbon nanotubes and their preparation, can solve problems such as difficult to effectively treat nitrate wastewater, poor removal effect of nitrate nitrogen, poor adsorption effect of nitrate nitrogen, etc. Achieve excellent treatment effect, good economic and environmental benefits, and excellent specific surface area

Active Publication Date: 2021-07-13
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, for example, Chinese patent CN102941063A discloses a method for adsorbing and removing phosphate in water by carbon nanotubes modified by zirconium oxychloride. It has a good removal effect, but the removal effect on nitrate nitrogen is not good; Chinese patent CN104258812A discloses a preparation method of a metal element-improved biochar-based nitrate adsorbent, which has a good effect on the high concentration of nitrate nitrogen in wastewater. removal effect, but it is difficult to effectively treat low-concentration nitrate wastewater
To sum up, the existing water body nitrate nitrogen adsorbents have the disadvantages of small adsorption capacity, low adsorption efficiency, and poor adsorption effect on low concentration nitrate nitrogen.

Method used

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preparation example Construction

[0023] The invention provides a method for preparing modified carbon nanotubes, comprising the following steps:

[0024] Mixing carbon nanotubes with mixed acid for acid oxidation treatment to obtain acid oxidized carbon nanotubes, the mixed acid includes concentrated nitric acid and concentrated sulfuric acid;

[0025] Mixing the acid-oxidized carbon nanotubes with a lanthanum chloride solution to modify them with rare earth salts to obtain lanthanum-modified carbon nanotubes;

[0026] The lanthanum-modified carbon nanotube is mixed with a cationic surfactant solution to modify the cationic surfactant to obtain the modified carbon nanotube.

[0027] In the present invention, unless otherwise specified, the raw materials used are all commercially available products.

[0028] The invention mixes carbon nanotubes with mixed acid for acid oxidation treatment to obtain acid oxidized carbon nanotubes, and the mixed acid includes concentrated nitric acid and concentrated sulfuric a...

Embodiment 1

[0048] Weigh 3.0 g of multi-walled carbon nanotubes with a balance and put them into a beaker filled with 300 mL of mixed acid (the volume ratio of nitric acid and sulfuric acid is 1:3), seal it, put it into an ultrasonic cleaner for ultrasonic reaction for 6 hours, and cool to room temperature Repeated washing with deionized water until neutral, and then drying in a vacuum oven at 45° C. for 24 hours to obtain acid-oxidized multi-walled carbon nanotubes.

[0049] Use a balance to weigh 3 parts of 1g of acid-oxidized multi-walled carbon nanotubes in 200 mL of lanthanum chloride solutions with mass fractions of 0.5%, 0.75%, and 1%, and ultrasonically disperse them for 2 hours. After cooling, wash them with deionized water for 3 hours. and then dried in a vacuum oven at 60°C for 18 hours to prepare lanthanum-modified multi-walled carbon nanotubes.

[0050] Take 1 g of the 3 parts of lanthanum-modified multi-walled carbon nanotubes obtained above with a balance, put them into 200...

Embodiment 2

[0052] Weigh 3.0 g of multi-walled carbon nanotubes with a balance and put them into a beaker filled with 300 mL of mixed acid (the volume ratio of nitric acid and sulfuric acid is 1:3), seal it, put it into an ultrasonic cleaner for ultrasonic reaction for 6 hours, and cool to room temperature Repeated washing with deionized water until neutral, and then drying in a vacuum oven at 45° C. for 24 hours to obtain acid-oxidized multi-walled carbon nanotubes.

[0053] Use a balance to weigh 3 g of the acid-oxidized multi-walled carbon nanotubes obtained above, and ultrasonically disperse them in 600 mL of lanthanum chloride solution with a mass fraction of 0.5% for 2 hours, wash them with deionized water for 3 times after cooling, and then vacuum Dry in a drying oven for 18 hours to prepare lanthanum-modified multi-walled carbon nanotubes.

[0054] Take 3 parts of 1g lanthanum-modified multi-walled carbon nanotubes with a balance and put them into the cetyltrimethylammonium bromid...

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Abstract

The invention provides a modified carbon nanotube and its preparation method and application, belonging to the field of advanced wastewater treatment. The material is made by grafting rare earth lanthanum ions to both ends of acidified carbon nanotubes through ultrasonic-assisted precipitation method. The carbon nanotubes loaded with lanthanum ions increase the positive charge and strengthen the adsorption effect on nitrate nitrogen in water. Then the cationic surfactant is coated on the surface of carbon nanotubes through electrostatic interaction, and the hemispherical hemimicelle formed by the cationic surfactant can enhance the hydrophobic characteristics of carbon nanotubes, so as to weaken the interference of water molecules on the adsorption of nitrate nitrogen the goal of. The modified carbon nanotubes have excellent adsorption effect on nitrate nitrogen in sewage, and are especially suitable for the advanced treatment and reuse technology of biochemical tail water with low nitrate nitrogen concentration, and the present invention has high denitrification efficiency and simple preparation process It has the advantages of easy operation, mild reaction conditions and easy control, and has good economic and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of advanced wastewater treatment, in particular to a modified carbon nanotube and its preparation method and application. Background technique [0002] With the further improvement of my country's total nitrogen discharge standards, it is difficult to discharge total nitrogen in sewage, causing a large number of sewage treatment plants to face the problem of standard upgrading. Nitrate nitrogen is the main component of total nitrogen in the biochemical tail water of sewage treatment plants, and it accounts for more than 75% of the total nitrogen in urban biochemical tail water. How to remove nitrate nitrogen in the tail water is of great significance for the discharge of sewage up to the standard. [0003] Traditional technologies for removing nitrate nitrogen from water include catalytic reduction, ion exchange, reverse osmosis, electrodialysis, and denitrification. At present, most sewage treatment plant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/30C01B32/168C02F1/28C02F101/16
CPCB01J20/0207B01J20/20B01J20/22B01J2220/46B01J2220/4806B01J2220/4812C02F1/283C02F1/285C02F2101/163C01B32/168
Inventor 刘波张陈永王梦良程绍举侯玉倩柳聪
Owner NANJING UNIV
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