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Method for removing mercury ions from water by using silver-modified magnetic carbon nanotube and regeneration method

A magnetic carbon nanotube, carbon nanotube technology, applied in separation methods, filter regeneration, chemical instruments and methods, etc., can solve the problems of difficult separation of adsorbent materials and water bodies, limited adsorption capacity, and difficulty in handling adsorbents. The possibility of avoiding secondary pollution, saving processing time and cost, and improving the effect of environmental and economic benefits

Inactive Publication Date: 2014-02-12
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in actual water bodies, there are usually many kinds of pollutants, the content of which is much higher than the concentration of mercury ions, and the selectivity of these adsorbents is usually poor, and they will also adsorb a large amount of other coexisting ions or Pollutants occupy a large number of adsorption sites and seriously affect the removal effect of the adsorbent on mercury ions
Adsorbents such as activated carbon that adsorb a large amount of mercury ions need to be separated from the water body after a long period of precipitation, and the separation process takes a long time
The separated precipitated sludge (adsorbent) cannot be recycled under normal circumstances, but is treated as hazardous waste. If it is slightly improper, it is very easy to cause secondary pollution, and the adsorbed mercury will be released into the environment again.
Therefore, the adsorbents currently used for the removal of mercury ions in water have the following main problems: (1) limited adsorption capacity; (2) poor selectivity; (3) the adsorption material and water are not easily separated; (4) the adsorbent is very Difficult to recycle and reuse; (5) The adsorbents adsorbed with mercury ions are difficult to handle and easily cause secondary pollution
Although carbon nanotubes have been used in water treatment, like other adsorbents, carbon nanotubes have poor adsorption selectivity to mercury ions, are easily interfered by other high-content pollutants, and have limited adsorption capacity for mercury ions. It is difficult to meet the advanced treatment requirements of mercury ions in water; at the same time, due to the certain hydrophobicity of carbon nanotubes, it is not easy to disperse and separate in water, and the operation in practical applications is relatively difficult; in addition, the cost of carbon nanotubes is relatively high, such as It cannot be recycled and reused, which will cause a significant increase in processing costs and limit its application prospects as an excellent adsorbent

Method used

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  • Method for removing mercury ions from water by using silver-modified magnetic carbon nanotube and regeneration method
  • Method for removing mercury ions from water by using silver-modified magnetic carbon nanotube and regeneration method
  • Method for removing mercury ions from water by using silver-modified magnetic carbon nanotube and regeneration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1 Activation of carbon nanotubes

[0045] ①Take 1.0g of carbon nanotube material, put it in a 60mL autoclave, add 20mL of concentrated nitric acid with a concentration mass fraction of 65-68%, and seal the autoclave;

[0046] 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 for 1.0h. After the reaction is complete, stop heating and cool down to room temperature naturally;

[0047] ③Take it out from the oven and open the reaction kettle, pour out the remaining waste acid, and wash the reaction product with deionized water until the cleaning solution is neutral;

[0048] ④ The above product was dried at 100° C. for 4 hours to obtain activated multi-walled carbon nanotubes for future use.

Embodiment 2

[0049] Example 2 Magnetically Modified Carbon Nanotubes

[0050] The magnetic modification reaction is carried out under the condition of ultrasonic wave and nitrogen protection, and the reaction temperature is 50°C;

[0051] Take 1.0g of the activated carbon nanotube material and suspend it in 200mL of an aqueous solution containing 1.7g (NH4)2Fe(SO4)2·6H2O and 2.5gNH4Fe(SO4)2·12H2O. In the mixed solution of the reaction system, iron / (iron+carbon nanotube) is 35%, and the product is recorded as 35% Fe magnetically modified carbon nanotube;

[0052] The above system was placed under ultrasonic conditions with an ultrasonic frequency of 40KHz, an ultrasonic power of 250W, and a heating power of 400W for 10 minutes. During the reaction, 8mol / L ammonia water was added dropwise to keep the pH of the mixture at 11-12;

[0053] After the acoustic reaction, the reaction system was placed in a constant temperature water bath at 50°C for 60 minutes, and stirred at a constant speed of ...

Embodiment 3

[0055] Example 3 Silver Nanoparticle Loading

[0056] Take 0.2 g of the iron oxide magnetically modified carbon nanotube material obtained in Example 2, and sonicate it in 50 ml of DMF / H2O mixed solution. Ultrasonic is carried out at an ultrasonic frequency of 40KHz, ultrasonic power of 250W, and room temperature of 20°C, and disperses for 1 h. . The volume ratio of DMF to H2O is 1:1;

[0057] ②Put 100mL solution containing 0.034 g AgNO3 and 100mL solution containing 0.1764 g trisodium citrate into a 500 ml beaker, stir vigorously and mix thoroughly;

[0058] ③ Freshly prepare 500mmol / L NaBH4 solution, place it in an ice-water bath, and set aside;

[0059] ④ Under the condition of vigorous stirring, use a pipette to add 2 ml of 500 mmol / L NaBH4 solution to the beaker containing AgNO3 solution and trisodium citrate solution drop by drop, and keep stirring for 5 minutes to obtain a silver colloidal solution;

[0060] ⑤ Add the mixed solution of iron-containing oxide magnetica...

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Abstract

The invention discloses a method for removing mercury ions from water by using silver-modified magnetic carbon nanotubes and a regeneration method thereof. A trace amount of mercury ions (Hg2+) in a polluted water body are adsorbed by silver nanoparticle-loaded / iron oxide magnetic carbon nanotubes as adsorbent under the conditions that the temperature is 20 DEG C to 60 DEG C and the pH value is 3 to 8; and the adsorbent is recycled and regenerated by thermal desorption. The silver nanoparticle-loaded / iron oxide magnetic carbon nanotube has powerful capability and specificity of adsorbing mercury ions in water. With magnetic separation techniques, the process of separating the adsorbent from the water solution is greatly simplified, the probability of secondary pollution is reduced to the greatest extent, and the environmental benefit is improved.

Description

technical field [0001] The invention relates to a method for removing mercury ions in water and a recovery and regeneration method thereof, in particular to a method for removing mercury ions in water by using a magnetic carbon nanocomposite material and a recovery and regeneration method thereof. Background technique [0002] Mercury pollution has become a global environmental problem, especially mercury in water has attracted people's attention. Mercury in water can be enriched by aquatic organisms and biotransform into highly toxic organic mercury compounds. Mercury and its compounds have strong neurotoxicity and genotoxicity, and a very small amount of mercury can cause tissue damage or disease, induce chromosomal damage and neurological diseases. In industry, mercury and its compounds are widely used, such as chlor-alkali, papermaking, batteries, electronics, metallurgy and medical equipment, etc. At the same time, some energy utilization processes can also cause certa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01J20/34C02F1/28C02F1/62
Inventor 苑春刚张艳张杨阳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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