Method for removing mercury ions in water and regeneration method of adsorbent used in same

An adsorbent and mercury ion technology, applied in the field of water treatment, can solve the problems of poor adsorption selectivity and specificity, increase the difficulty of operation, and difficult solid-liquid separation, etc., to improve adsorption capacity and selectivity, enhance affinity, high The effect of environmental economic benefits

Inactive Publication Date: 2012-05-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some difficulties in the practical application of carbon nanotube materials as adsorbents in the treatment of heavy metal pollution: (1) Due to the certain hydrophobicity and bulky texture of carbon nanotubes, they are not effective in removing trace pollutants in water bodies. It is not easy to be dispersed during the process; solid-liquid separation is not easy after treatment, which increases the difficulty of operation; (2) Compared with traditional adsorbents (such as activated carbon), carbon nanotubes are usually more expensive and difficult to be recycled after use (3) The adsorption behavior of carbon nanotubes to compounds or ions in water is generally physical adsorption, and the adsorption selectivity and specificity are poor; (4) The surface of carbon nanotubes has certain hydrophobicity, which is To improve the adsorption effect of carbon nanotubes on heavy metal ions, it is usually necessary to add a metal complexing agent to the solution to make the metal ions form a metal complex with certain hydrophobicity, which is then adsorbed by the carbon nanotube material
However, adding complexing agents to treated water can easily lead to new pollution

Method used

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  • Method for removing mercury ions in water and regeneration method of adsorbent used in same
  • Method for removing mercury ions in water and regeneration method of adsorbent used in same
  • Method for removing mercury ions in water and regeneration method of adsorbent used in same

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Example 1 Activation of carbon nanotubes

[0046] Take 1.0g of carbon nanotube composite material, put it in a 60mL autoclave, add 20mL of concentrated nitric acid with a mass fraction of 65-68%, and seal the autoclave; the autoclave used is a high-pressure airtight container, which is resistant to high pressure. The high-pressure reaction kettle is composed of a polytetrafluoroethylene lined tank and a stainless steel sealed jacket. The stainless steel sealed jacket is compacted up and down with threads, so that the lid and the tank of the lined tank can be sealed, and the internal reactants are sealed by heating. The reaction is carried out under the conditions of high temperature and high pressure in the environment;

[0047] 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 temper...

Embodiment 2

[0050] Example 2 Magnetic modification of carbon nanotubes

[0051] The magnetic modification reaction is carried out under the condition of nitrogen protection, and the reaction temperature is 50°C;

[0052] ②Weigh 1.0g of the activated carbon nanotube composite material, suspend it in 200ml of aqueous solution containing 1.7g of (NH4)2Fe(SO4)2·6H2O and 2.5g of NH4Fe(SO4)2·12H2O, and mix the solution of the reaction system The mass fraction of iron / (iron+carbon nanotubes) is 35%, and the synthetic product is recorded as 35% Fe magnetically modified carbon nanotubes;

[0053] The above system was reacted under ultrasonic conditions for 10 minutes. During the reaction process, 8mol / L ammonia water was added dropwise to keep the pH value of the mixture at 11-12; the ultrasonic frequency was 40KHz, the ultrasonic power was 250W, and the heating power was 400W;

[0054] ④ After the ultrasonic reaction, in order to further ensure that the reaction is complete, the reaction system ...

Embodiment 3

[0056] Example 3 Magnetic carbon nanotubes supported metal palladium

[0057] Weigh 1.0 g of 35% Fe magnetically modified carbon nanotube composite material, suspend it in 300 mL of PdCl2 aqueous solution containing 0.0825 g, and the mass fraction of palladium / (palladium+magnetically modified carbon nanotube) in the reaction system solution is 5%, The product is recorded as 5%Pd-35%Fe palladium nanoparticle-loaded / iron oxide magnetically modified carbon nanotube composite material;

[0058] ② Place the above system solution under ultrasonic conditions for 15 minutes; the ultrasonic frequency is 40KHz, the ultrasonic power is 250W, and the temperature is 20°C;

[0059] ③ After the ultrasonic reaction is over, add 8mol / L ammonia water drop by drop under the constant stirring condition of 300-400r / min to keep the pH value of the mixture at 8-9;

[0060] ④ Under constant stirring condition of 300-400r / min, add 50mL of newly prepared 0.05mol / L NaBH4 solution dropwise, and react fo...

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Abstract

The invention relates to a method for removing mercury ions in water and a regeneration method of an adsorbent used in the same. An adsorbent is put in water to be treated to adsorb mercury ions in the water. The adsorbent is a palladium nanoparticle supported/iron oxide magnetic modified carbon nanotube composite material. The carbon nanotube composite material provided by the invention has nanostructure and large specific area; and after the carbon nanotube composite material is oxidized and activated, carboxyl group, hydroxyl group and other active functional groups are formed on the surface of the carbon nanotube composite material, thereby enhancing the hydrophilic property and the adsorptive capacity for positively charged metallic ions. The iron oxide is coated on the surface of the activated carbon nanotube composite material, and therefore, the activated carbon nanotube composite material has strong soft magnet property, and can easily implement solid-liquid separation of the adsorbent and the polluted water body under the action of an external magnetic field. The palladium modification strengthens the affinity of the composite material with mercury ions, and greatly enhances the adsorption capacity and selectivity of the original carbon nanotube composite material for mercury ions (the maximum adsorption capacity is 55.3mg/g).

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 using a magnetic carbon nanotube composite material and a recycling method for the material, belonging to the technical field of water treatment. Background technique [0002] Mercury can be released naturally through volcanic eruptions and weathering of the earth's crust, circulates among the biosphere, hydrosphere, atmosphere and lithosphere, and exists in flora and fauna for a long time. Human activities, especially industrial development, accelerate the emission of mercury and the circulation of mercury on a global scale. Exposure to very small amounts of mercury can harm the human liver, kidneys, reproductive system and nervous system. Trace amounts of mercury present in the environment, especially in water bodies, can be enriched and amplified by aquatic organisms, and transformed into neurotoxic organic mercury c...

Claims

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Application Information

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