Method for synthesizing nitrogen-doped graphene hydrogel in one step and using nitrogen-doped graphene hydrogel for electrically adsorbing heavy metal ions in water

A technology of nitrogen-doped graphene and heavy metal ions is applied in the directions of alkali metal compounds, water/sewage treatment, water/sludge/sewage treatment, etc., to achieve the effects of simple and easy preparation method, environmental protection and pollution-free preparation process, and easy operation.

Inactive Publication Date: 2015-10-21
CHANGZHOU UNIV
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Problems solved by technology

The present invention utilizes the large specific surface area and high electron transfer rate of graphene hydrogel to remove heavy metal ions in wastewater. This method has not been reported yet

Method used

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  • Method for synthesizing nitrogen-doped graphene hydrogel in one step and using nitrogen-doped graphene hydrogel for electrically adsorbing heavy metal ions in water
  • Method for synthesizing nitrogen-doped graphene hydrogel in one step and using nitrogen-doped graphene hydrogel for electrically adsorbing heavy metal ions in water
  • Method for synthesizing nitrogen-doped graphene hydrogel in one step and using nitrogen-doped graphene hydrogel for electrically adsorbing heavy metal ions in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation of nitrogen-doped hydrogel material paper electrode includes the following steps:

[0024] (1) 0.2 g of graphene oxide (GO) was ultrasonically dispersed in 100 ml of distilled water, and then 6 g of urea was added, and mechanically stirred for 15 min. The mixture was poured into a hydrothermal reactor and heated to 180°C for 12 hours. The resulting product was immersed in distilled water for 3 to 4 days, and finally the sample was freeze-dried at -50°C for 24 hours to obtain nitrogen-doped graphene airgel.

[0025] (2) Add 90 mg of the nitrogen-doped graphene airgel material prepared in step (1) into 2 mL of 4 wt % polyvinyl alcohol solution, and ultrasonically disperse the composite material in the solution evenly. Take 0.16mL of the above dispersion liquid and apply it evenly on a 20mm×5mm hard paper sheet (thickness 400μm), and freeze-dry it at -50°C for 4h to make a nitrogen-doped graphene airgel paper electrode.

[0026] The prepared nitrogen-dope...

Embodiment 2

[0028] The preparation process of the nitrogen-doped graphene airgel paper electrode is the same as that of Example 1.

[0029] Cyclic electrosorption experiments were performed on nitrogen-doped graphene airgel paper electrodes. The nitrogen-doped graphene airgel paper electrode was placed in 80 mL of Pb(NO 3 ) 2 In the solution, apply a potential of -0.3V, and record the conductivity of the solution, record the conductivity of the solution again after 2 minutes, and calculate the removal rate. Then the potential was removed to allow it to desorb, and the cycle was repeated several times. Experimental results such as Figure 4 shown. The first adsorption of Pb 2+ The removal rate is 75%, and after 100 cycles of use, the electrode is on Pb 2+ The removal rate was 70%. It shows that the material has extremely high regeneration performance.

Embodiment 3

[0031] The preparation process of the nitrogen-doped graphene airgel paper electrode is the same as that of Example 1.

[0032] The prepared nitrogen-doped graphene airgel paper electrode was used in 3mM Pb(NO 3 ) 2 For the electrochemical treatment of the solution, the applied voltage was -0.3V, and the treatment time was 2min. Such as Figure 5 As shown, the nitrogen-doped graphene airgel paper electrode paired with Pb 2+ The removal rate is 42%.

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Abstract

The invention relates to a method for synthesizing nitrogen-doped graphene hydrogel in one step and using nitrogen-doped graphene hydrogel for electrically adsorbing heavy metal ions in water. The method comprises the following steps of preparing nitrogen-doped graphene hydrogel and nitrogen-doped graphene hydrogel paper electrodes, and adsorbing and desorbing the heavy metal ions in the water by regulating and controlling voltage on the electrodes. The nitrogen-doped graphene hydrogel has the advantages that the preparing method of the nitrogen-doped graphene hydrogel is simple and easy to implement, the preparation process is environmentally friendly and free from pollution, the electrodes modified by the hydrogel are high in efficiency and speed of adsorbing the heavy metal ions in the water, and easy to operate, and the recycling performance of the hydrogel is greatly improved compared with that of materials in the past.

Description

technical field [0001] The invention relates to the application of nitrogen-doped graphene hydrogel synthesized by a one-step method to electro-adsorption of heavy metal ions in water, and belongs to the fields of waste water treatment and material synthesis. technical background [0002] The shortage of water resources is a major problem facing the world. A large amount of industrial production often causes serious pollution to water resources, especially industrial wastewater such as electroplating, metallurgy, and chemical industry often contains a large amount of heavy metal ions. The excessive accumulation of heavy metals in the food chain will cause great harm to the natural environment and human health. There are many ways to deal with heavy metals in water: electroadsorption, reverse osmosis, chemical precipitation, etc. Compared with other water treatment methods, electro-adsorption has the advantages of no secondary pollution, low energy consumption, low investmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01J20/34C02F1/469C02F1/62
Inventor 孔泳徐斓魏永
Owner CHANGZHOU UNIV
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