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Method for removing manganese ions in water by using N-S element synergetic modified graphene electrode

A graphene electrode, manganese ion technology, applied in separation methods, chemical instruments and methods, water/sewage treatment and other directions, can solve problems such as the decline in the utilization quality of industrial water and domestic drinking water, and achieve a simple and easy preparation method. Short, high adsorption efficiency

Inactive Publication Date: 2016-09-21
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the water contains excessive manganese, the utilization quality of industrial water and drinking water will be reduced.

Method used

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  • Method for removing manganese ions in water by using N-S element synergetic modified graphene electrode
  • Method for removing manganese ions in water by using N-S element synergetic modified graphene electrode
  • Method for removing manganese ions in water by using N-S element synergetic modified graphene electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The preparation of nitrogen-sulfur co-doped graphene airgel paper electrode includes the following steps:

[0021] (1) Ultrasonic disperse 0.15g of graphene oxide (GO) in 100mL of distilled water, then add 0.45g of L-cysteine, stir it mechanically to make it fully mixed, and then put the mixture at 95°C Heated in a water bath for 2h. After the reaction, the resulting product was immersed in distilled water for 2-3 days, and finally the sample was freeze-dried at -52°C for 24 hours to obtain nitrogen-sulfur co-doped graphene airgel.

[0022] (2) Add 90mg of the nitrogen-sulfur co-doped graphene airgel material prepared in step (1) into 2mL of 4wt% 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 35mm×8mm hard paper sheet (thickness 400μm), and freeze-dry it at -52°C for 12h to make a nitrogen-sulfur co-doped graphene airgel paper electrode.

Embodiment 2

[0024] The preparation process of the nitrogen-sulfur co-doped graphene airgel paper electrode is the same as that of Example 1.

[0025] The prepared nitrogen-doped graphene airgel paper electrodes were used for 0.25, 0.4, 0.8, 1, 3 and 6 mM Mn 2+ Electrochemical treatment of the solution, the applied voltage is 0.3V, the treatment time is 2min, Mn 2+ The removal rate see figure 2 , it can be seen that the nitrogen-doped graphene airgel material has a low concentration of Mn 2+ The solution has a better adsorption effect.

Embodiment 3

[0027] The preparation process of the nitrogen-sulfur co-doped graphene airgel paper electrode is the same as that of Example 1.

[0028] Cyclic electrosorption experiments on nitrogen-sulfur co-doped graphene airgel paper electrodes. The nitrogen-sulfur co-doped graphene airgel paper electrode was placed in 80 mL of Mn with a concentration of 0.25 mmol / L 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 image 3 shown. The first adsorption of Mn 2+ The removal rate was 76%. After 30 cycles of use, the electrode paired with Mn 2+ The removal rate was 74.7%, and then the electro-adsorption cycle experiment was continued, the electro-adsorption removal rate gradually decreased, and the removal rate was 69.5% after 8...

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Abstract

The invention relates to a method for removing manganese ions in water by using an N-S element synergetic modified graphene electrode. The method comprises the following steps: preparing N-S co-doped graphene aerogel, preparing an N-S co-doped graphene aerogel paper electrode, and carrying out electro-adsorption on the multiple manganese ions by means of the paper electrode under a three-electrode system. The method has the beneficial effects that the preparation method of the N-S co-doped graphene aerogel is simple, convenient and easy to implement, and the preparation process is environmentally friendly and free from pollution; the electrode modified by the materials is high in absorption efficiency and rapid in absorption speed for the manganese ions in the water, is simple and convenient to operate, and is capable of effectively removing the manganese ions in the water.

Description

technical field [0001] The invention relates to a method for synergistically modifying graphene electrodes with N and S elements to remove manganese ions in water, belonging to the fields of water treatment and material synthesis. technical background [0002] Manganese is one of the more abundant elements in nature and one of the trace elements necessary for living organisms. However, if the water contains excessive manganese, the utilization quality of industrial water and drinking water will be reduced. The main sources of manganese-containing wastewater are: wastewater discharged from iron and steel enterprises, wastewater from electrolytic manganese production enterprises, polluted water from manganese ore mines, wastewater discharged from ferrous metal mines, metallurgy, and chemical industry, etc. my country's "Drinking Water Sanitation Standard" (GB5749-2006) stipulates that manganese content in water is less than 0.1mg / L, which will not cause harm to human health. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469
CPCC02F1/469
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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