Carbon nanotube/hydrotalcite material for removal of nitrate nitrogen from water and preparation method

Abstract

Relating to the technical field of nitrogen-containing sewage treatment, the invention provides a carbon nanotube / hydrotalcite material for removal of nitrate nitrogen from water and a preparation method. The method includes: conducting in-situ generation of a lanthanum-doped hydrotalcite layer on the pipe wall of a multiwalled carbon nanotube by coprecipitation, and employing a cationic surfactant cetylpyridine bromide for surface modification of the hydrotalcite layer, thus obtaining the carbon nanotube / hydrotalcite material for removal of nitrate nitrogen from water. According to the preparation method provided by the invention, hydrotalcite is loaded on the pipe wall of the multiwalled carbon nanotube, thus increasing the specific surface area of hydrotalcite and exposing more active sites, and rare earth metal lanthanum is also employed for doping, lanthanum undergoes complexing with NO3<-> to form a stable polyamine complex. Further, cetylpyridine bromide is employed for surfacemodification, thus reducing the electronegativity of the hydrotalcite surface, and providing more active sites for adsorption of NO3<->. Therefore, the carbon nanotube / hydrotalcite material has a goodremoval effect on nitrate nitrogen in water.

Description

technical field [0001] The invention belongs to the technical field of nitrogen-containing sewage treatment, and provides a carbon nanotube / hydrotalcite material and a preparation method for removing nitrate nitrogen in water. Background technique [0002] The main form of nitrogen in nature is NH 3 , N 2 , N 2 O, NO 2 , NO 2 - , NO 3 - And organic nitrogen, due to human interference, destroyed the natural nitrogen balance, resulting in an increase in nitrogen content in the water environment. Among them, nitrate nitrogen (NO 2 - , NO 3 - ) is the most common chemical pollution and its level is still increasing. Nitrate nitrogen not only has a wide range of sources, but also almost all nitrates are soluble, and the solubility is very high, which leads to the rapid migration and diffusion of nitrate in water and soil, causing a wide range of nitrate nitrogen pollution, so in wastewater The removal of nitrate nitrogen has been widely concerned by environmental pro...

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Problems solved by technology

[0006] In summary, when the hydrotalcite commonly used in the prior art is used for the treatment of nitrate-nitrogen-containing sewage, due to the lack of surface active sites, resulting in NO 3 - The removal effect of nitrate nitrogen is not ideal, so it is of great significance to develop a hydrotalcite composite material that can efficiently remove nitrate nitrogen in water

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