Modified carbon nanotube as well as preparation method and application thereof

Abstract

The invention provides a modified carbon nanotube as well as a preparation method and application thereof, and belongs to the field of advanced wastewater treatment. According to the material, rare earth lanthanum ions are grafted to the two ends of an acidified carbon nanotube through an ultrasonic-assisted precipitation method, the positive charge quantity of the lanthanum ion-loaded carbon nanotube is increased, and the adsorption effect on nitrate nitrogen in a water body is enhanced. Then the surface of the carbon nano tube is coated with the cationic surfactant through electrostatic interaction, and the hydrophobic characteristic of the carbon nano tube can be enhanced through semispherical semi-micelles formed by the cationic surfactant, so that the purpose of weakening the interference of water molecules on nitrate nitrogen adsorption is achieved. The modified carbon nanotubes have an excellent adsorption effect on nitrate nitrogen in sewage and are especially suitable for advanced treatment and recycling technologies of biochemical tail water with low nitrate nitrogen concentration. The invention have the advantages of high denitrification efficiency, simple and easy-to-operate preparation process, mild and easy-to-control reaction conditions and the like, and have 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...

AI Technical Summary

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.