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Method for removing arsenic ions in water through N element modified graphene electrode

A technology of graphene electrodes and arsenic ions, which is applied in the direction of separation methods, chemical instruments and methods, water pollutants, etc., can solve problems affecting the performance of graphite, etc., and achieve the effects of simple operation, short time, and simple and easy preparation methods

Inactive Publication Date: 2016-10-12
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of preparing graphene, due to the π-π bonds and van der Waals forces in graphene, it may cause irreversible aggregation or re-stacking into a graphite structure, which will affect the performance of graphite.

Method used

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  • Method for removing arsenic ions in water through N element modified graphene electrode
  • Method for removing arsenic ions in water through N element modified graphene electrode
  • Method for removing arsenic ions in water through N element modified graphene electrode

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. Place the nitrogen-doped graphene airgel paper electrode in 80mL of As with a concentration of 0.25mmol / L 3+ 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 image 3 shown. The first adsorption of As 3+ The removal rate was 65.4%. After 30 cycles of use, the electrode paired As 3+ The removal rate was 64.4%, and the removal rate only decreased by 1%, but when the cycle experiment was continued, the removal rate began to show a downward trend.

Embodiment 3

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

[0032] Prepared nitrogen-doped graphene airgel paper electrode for 3 mM As 3+ For the electrochemical treatment of the solution, the applied voltage was -0.3V, and the treatment time was 2min. Such as Figure 4 As shown, nitrogen-doped graphene airgel paper electrode pair As 3+ The removal rate is 52%.

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Abstract

The invention relates to a method for removing arsenic ions in water by modifying graphene electrodes with N elements, comprising the following steps: preparing nitrogen-doped graphene airgel, preparing nitrogen-doped graphene airgel paper electrodes, and adjusting the voltage on the electrodes to water Adsorption and desorption of heavy metal ions. The beneficial effects of the present invention are: the preparation method of nitrogen-doped graphene airgel is simple and easy, and the preparation process is environmentally friendly and pollution-free; the electrode modified with this material has high adsorption efficiency, fast speed, and simple operation for heavy metal ions in water; Compared with conventional materials, the recycling performance has been greatly improved.

Description

technical field [0001] The invention relates to a method for removing arsenic ions in water by N element-modified graphene electrodes, belonging to the fields of water treatment and material synthesis. technical background [0002] With the rapid development of our country's social economy, arsenic pollution, which was not paid attention to by people, is becoming more and more serious. Since arsenic compounds are highly toxic and widely used in industrial and agricultural production, the pollution of arsenic to the environment, especially to water pollution, has attracted widespread attention of environmental scientists all over the world. In addition, due to the natural arsenic deposits, the background arsenic content in groundwater in some areas of my country is too high, exceeding the maximum allowable value for drinking water, which is 25-50×10 -9 , causing chronic harm to local residents. According to reports, the arsenic that enters the hydrosphere through various ch...

Claims

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Application Information

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IPC IPC(8): C02F1/469C02F101/20
CPCC02F1/4691C02F2101/103
Inventor 魏永徐斓赵威廖旭崔文怡王钰李如意吕晓港
Owner CHANGZHOU UNIV
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