Method for removing mercury ions in water by using magnetically-modified carbon nano tube and method for regenerating magnetically-modified carbon nano tube

A carbon nanotube, mercury ion technology, applied in chemical instruments and methods, other chemical processes, water/sewage treatment, etc. problems, to achieve good economic and environmental benefits, reduce the risk of secondary pollution, and facilitate subsequent treatment.

Inactive Publication Date: 2012-07-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the certain hydrophobicity and low density of carbon nanotubes, it is not easy to disperse in the process of removing trace pollutants in the water body, and the adsorption material (carbon nanotubes) that adsorbs pollutants after the treatment is also very difficult. It is difficult to separate, and the actual operation is difficult; in addition, the price of carbon nanotubes is usually relatively expensive. If they cannot be recycled and reused after use, it will inevitably greatly push up the actual operating cost of water treatment, and also severely limit its use. Application range
[0004] Although carbon nanotubes can be used for the removal of various pollutants, there are still several problems in this regard: (1) Due to the bulky texture and certain hydrophobicity, carbon nanotubes are not easy to dissolve in the water phase. It is very well dispersed, which greatly affects the adsorption and removal effect on mercury ions; (2) After adsorption and removal of mercury ions in water, carbon nanotubes will still be suspended in the solution or float on the surface of the solution, and small volume water samples can be centrifuged However, when dealing with a large volume of polluted water, centrifugation is no longer feasible, and it is difficult to separate the solid from the liquid and collect the adsorbent after the adsorption is completed; (3) After the treatment, the adsorbed mercury Ionic carbon nanotube materials urgently need to be recycled and reused to save processing costs and reduce the risk of secondary pollution; (4) The adsorption capacity and efficiency of carbon nanotubes for mercury ions are still limited, and the adsorption of mercury ions requires Further improvement to meet the needs in the actual water treatment process
However, so far, no research reports on the use of magnetic carbon nanotube materials to remove mercury ions in water and their regeneration have been retrieved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 Preparation of magnetically modified carbon nanotube materials

[0038] A. Oxidative activation:

[0039] 1. Take carbon nanotube material 1.0g, place in 60 ml autoclave, add 20 ml concentration mass fraction and be the concentrated nitric acid of 65-68%, airtight autoclave; The autoclave used in the present invention is a high pressure airtight The container is resistant to high pressure. It is composed of a polytetrafluoroethylene lined tank and a stainless steel sealing jacket. The stainless steel sealing jacket is compacted up and down by threads, so that the lid and the tank body of the lined tank can achieve a sealing effect, and the internal reaction can be made by heating The reaction is carried out under the conditions of high temperature and high pressure in a closed environment;

[0040] ②Put the high-pressure reactor containing the above reactants in an oven, keep it at 100°C for 10 minutes, then rapidly raise the temperature to 150°C, and react f...

Embodiment 2

[0049] Example 2 Preparation of magnetically modified carbon nanotube materials

[0050] A, oxidation activation is the same as embodiment 1:

[0051] B. Magnetic modification:

[0052] ①The magnetic modification reaction is carried out under the condition of ultrasonic wave and nitrogen protection, and the reaction temperature is 50 ℃;

[0053] ② Weigh 1.0 g of the activated carbon nanotube material and suspend it in 200 ml of a mixed solution containing 1.24 g (NH4)2Fe(SO4)2·6H2O and 1.83NH4Fe(SO4)2·12H2O. (iron+carbon nanotube) mass fraction is 28%, and product is recorded as 28% / Fe magnetically modified carbon nanotube;

[0054] ③ Put the above system solution under the conditions of ultrasonic frequency 40 KHz, ultrasonic power 250 W, and heating power 400 W for 10 min; add 8 mol / L ammonia water dropwise during the reaction to keep the pH value of the mixture at 11- Between 12;

[0055] ④ After the ultrasonic reaction, the reaction system was kept in a constant temper...

Embodiment 3

[0057] Example 3 Preparation of magnetically modified carbon nanotube materials

[0058] A, oxidation activation is the same as embodiment 1:

[0059] B. Magnetic modification:

[0060] ①The magnetic modification reaction is carried out under the condition of ultrasonic wave and nitrogen protection, and the reaction temperature is 50 ℃;

[0061] ② Weigh 1.0g of the activated carbon nanotube material and suspend it in 200 ml of a mixed solution containing 2.62g (NH4)2Fe(SO4)2·6H2O and 3.85gNH4Fe(SO4)2·12H2O. (iron+carbon nanotube) mass fraction is 45%, and product is recorded as 45% / Fe magnetically modified carbon nanotube;

[0062] ③ Put the above system solution under the conditions of ultrasonic frequency 40 KHz, ultrasonic power 250 W, and heating power 400 W for 10 min; add 8 mol / L ammonia water dropwise during the reaction to keep the pH value of the mixture at 11- Between 12;

[0063] ④ After the ultrasonic reaction, the reaction system was kept in a constant tempera...

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Abstract

The invention relates to a method for removing mercury ions in water by using a magnetically-modified carbon nano tube and a method for regenerating the magnetically-modified carbon nano tube. According to the method for removing the mercury ions in the water, the material of the magnetically-modified carbon nano tube is put into the water to be treated to adsorb the mercury ions in the water; and iron oxides are wrapped or loaded on the material surface of the magnetically-modified carbon nano tube. According to the method, the loaded iron oxides have soft magnetism, so the solid-liquid separation of an adsorbent and a solution can be implemented conveniently under the action of an additional magnetic field; and the magnetically-modified carbon nano tube can be regenerated by the elution of an acid solution, so that the water treatment cost is saved, the possibility of secondary pollution is reduced, and the magnetically-modified carbon nano tube has good economic and environmental benefits.

Description

technical field [0001] The invention relates to a method for removing mercury ions in water, in particular to a method for removing mercury ions in water by magnetically modifying carbon nanotubes. Background technique [0002] Due to geological and anthropogenic reasons, the toxic element mercury can be released into the environment, posing a serious threat to human health. Trace amounts of mercury present in the environment, especially in water, can be bioaccumulated and biomagnified by aquatic organisms through the food chain, and in the process of biogeochemical cycles, neurotoxic organic mercury compounds are generated, and the toxicity is increased by nearly a thousand times. Neurotoxic organic mercury compounds can penetrate the blood-brain barrier and the placental barrier, and have strong genotoxicity. Therefore, the removal of trace mercury in water is of great significance to the protection of the ecological environment and human health. [0003] Carbon nanotube...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 苑春刚张艳张杨阳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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