A carbon nanotube/hydrotalcite material for removing nitrate nitrogen in water and its preparation method

Abstract

The invention relates 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. In this method, a lanthanum-doped hydrotalcite layer is formed in situ on the tube wall of a multi-walled carbon nanotube by a co-precipitation method, and the surface of the hydrotalcite layer is modified by a cationic surfactant cetylpyridinium bromide. A carbon nanotube / hydrotalcite material for the removal of nitrate nitrogen in water is obtained. In the preparation method of the present invention, the hydrotalcite is loaded on the tube wall of the multi-walled carbon nanotube, the specific surface area of ​​the hydrotalcite is increased, and more active sites are exposed, and the rare earth metal lanthanum is used for doping, and the lanthanum can with NO 3 ‑ complexation to form a stable polyamine complex, and further, the use of cetylpyridine bromide for surface modification can reduce the electronegativity of the hydrotalcite surface, which is NO 3 ‑ The adsorption provides more active sites, so it has a good removal 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 for removing nitrate nitrogen in water and a preparation method. 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, the natural nitrogen balance is destroyed, resulting in an increase in nitrogen content in the water environment. Among them, nitrate nitrogen (NO 2 - , NO 3 - ) is the most common chemical contamination and its levels are still increasing. Nitrate nitrogen not only has a wide range of sources, but almost all nitrates are soluble and highly soluble, which leads to the rapid migration and diffusion of nitrates in water and soil, resulting in a wide range of nitrate pollution. The removal of nitrate nitrogen has received widespread attention from environmental protection workers in v...

AI Technical Summary

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

Images