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

A carbon nanotube and multi-wall carbon nanotube technology, which can be applied in water/sewage treatment, adsorbed water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as unsatisfactory removal effect, and achieve good removal effect. , reduce electronegativity, and promote the effect of adsorption and removal

Active Publication Date: 2019-02-01
成都硕特科技股份有限公司
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  • Abstract
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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

Method used

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

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Effect test

Embodiment 1

[0027] (1) Add magnesium nitrate hexahydrate, aluminum nitrate nonahydrate, and lanthanum nitrate hexahydrate into deionized water to obtain solution A; add sodium carbonate and sodium hydroxide to deionized water to obtain solution B; in solution A, nitric acid hexahydrate 11 parts by weight of magnesium, 9 parts by weight of aluminum nitrate nonahydrate, 2 parts by weight of lanthanum nitrate hexahydrate, 78 parts by weight of deionized water; in solution B, 7 parts by weight of sodium carbonate, 4 parts by weight of sodium hydroxide, and 89 parts by weight of deionized water share;

[0028] (2) Disperse the multi-walled carbon nanotubes in deionized water, and heat the dispersion, then drop solution A and solution B into the multi-walled carbon nanotubes dispersion at the same time, stir vigorously to react, and then let it stand for 3.5h, Generate a lanthanum-doped hydrotalcite layer on the tube wall of the multi-walled carbon nanotubes; the parts by weight of each raw mat...

Embodiment 2

[0031] (1) Add magnesium nitrate hexahydrate, aluminum nitrate nonahydrate, and lanthanum nitrate hexahydrate into deionized water to obtain solution A; add sodium carbonate and sodium hydroxide to deionized water to obtain solution B; in solution A, nitric acid hexahydrate 10 parts by weight of magnesium, 8 parts by weight of aluminum nitrate nonahydrate, 2 parts by weight of lanthanum nitrate hexahydrate, 80 parts by weight of deionized water; in solution B, 6 parts by weight of sodium carbonate, 4 parts by weight of sodium hydroxide, and 90 parts by weight of deionized water share;

[0032] (2) Disperse the multi-walled carbon nanotubes in deionized water, and heat the dispersion, then drop solution A and solution B into the multi-walled carbon nanotubes dispersion at the same time, stir vigorously to react, and then stand for 3 hours, A hydrotalcite layer doped with lanthanum is generated on the tube wall of the multi-walled carbon nanotube; the parts by weight of each raw...

Embodiment 3

[0035](1) Add magnesium nitrate hexahydrate, aluminum nitrate nonahydrate, and lanthanum nitrate hexahydrate into deionized water to obtain solution A; add sodium carbonate and sodium hydroxide to deionized water to obtain solution B; in solution A, nitric acid hexahydrate 12 parts by weight of magnesium, 9 parts by weight of aluminum nitrate nonahydrate, 3 parts by weight of lanthanum nitrate hexahydrate, 76 parts by weight of deionized water; in solution B, 7 parts by weight of sodium carbonate, 5 parts by weight of sodium hydroxide, and 88 parts by weight of deionized water share;

[0036] (2) Disperse the multi-walled carbon nanotubes in deionized water, and heat the dispersion, then drop solution A and solution B into the multi-walled carbon nanotubes dispersion at the same time, stir vigorously to react, and then let stand for 4 hours, A hydrotalcite layer doped with lanthanum is generated on the tube wall of the multi-walled carbon nanotube; the parts by weight of each ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C02F1/28B01J20/30C02F101/16
CPCB01J20/0207B01J20/0248B01J20/0296B01J20/04B01J20/12B01J20/20C02F1/281C02F2101/163C02F2101/166
Inventor 蔡菁菁
Owner 成都硕特科技股份有限公司
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