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One-step synthesized nitrogen and sulfur co-doped graphene aerosol and electro-adsorption removal of various heavy metal ions thereby

A technology of graphene airgel and nitrogen-sulfur co-doping, applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., to achieve the effects of improved electrosorption performance, short time, and simple and easy preparation methods

Inactive Publication Date: 2016-06-15
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the present invention utilizes the large specific surface area and high electron transfer rate of graphene airgel to remove heavy metal ions in wastewater, and dope nitrogen and sulfur atoms in the airgel to prepare nitrogen-sulfur co-doped graphene gas. At the same time, the electro-adsorption effect between various heavy metal ions was studied. This method has not been reported yet.

Method used

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  • One-step synthesized nitrogen and sulfur co-doped graphene aerosol and electro-adsorption removal of various heavy metal ions thereby
  • One-step synthesized nitrogen and sulfur co-doped graphene aerosol and electro-adsorption removal of various heavy metal ions thereby
  • One-step synthesized nitrogen and sulfur co-doped graphene aerosol and electro-adsorption removal of various heavy metal ions thereby

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-sulfur co-doped graphene airgel paper electrodes were used for Pb(NO 3 ) 2 , CdSO 4 , HgSO 4 and CuSO 4 Electrochemical treatment of the solution, the applied voltage is -0.3V, the treatment time is 2min, Pb 2+ 、Cd 2+ , Hg 2+ and Cu 2+ The removal rate see figure 2 , it can be seen that nitrogen and sulfur co-doped graphene airgel materials have a strong effect on heavy metal ions Cu 2+ The adsorption effect is the best.

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. to Cu 2+ As an example, a cyclic electrosorption experiment was carried out on a nitrogen-sulfur co-doped graphene airgel paper electrode. The nitrogen-sulfur co-doped graphene airgel paper electrode was placed in 80mL of CuSO with a concentration of 1mmol / L 4 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. Adsorbed Cu for the first time 2+ The removal rate is 65%, and after 100 cycles of use, the electrode is on Cu 2+ The removal rate was 62%. It shows that the mat...

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Abstract

The invention relates to one-step synthesis of nitrogen-sulfur co-doped graphene airgel and its electro-adsorption removal of various heavy metal ions, comprising the following steps: preparing nitrogen-sulfur co-doped graphene airgel, preparing nitrogen-sulfur co-doped Graphene airgel paper electrode, under the three-electrode system, conducts electrosorption of various heavy metal ions through the paper electrode. The beneficial effects of the present invention are: the preparation method of nitrogen-sulfur co-doped graphene airgel is simple and easy, the preparation process is environmentally friendly and pollution-free, and the electrode modified with these materials has high adsorption efficiency, fast speed and easy operation for heavy metal ions in water , and compared the electrosorption effects of various heavy metal ions.

Description

technical field [0001] The invention relates to one-step synthesis of nitrogen-sulfur co-doped graphene airgel and its electroadsorption and removal of various heavy metal ions, belonging to the fields of waste water treatment and material synthesis. technical background [0002] At present, the heavy metal pollution in water body has been paid more and more attention by people, which has also become the research problem and focus of water environment pollution control at home and abroad. Heavy metal ions in water can be enriched in aquatic organisms and endanger human health through the food chain. At present, the commonly used methods for treating heavy metal ion wastewater include chemical precipitation, oxidation, reduction, evaporation and concentration, ion exchange, activated carbon adsorption and flotation, etc., but they are all difficult to operate, expensive to treat, and easy to deal with. Cause secondary pollution and other shortcomings. Electrosorption is a n...

Claims

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Application Information

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IPC IPC(8): C02F1/469C01B31/04C02F101/20C02F101/22
CPCC02F1/4691C02F2101/20C02F2101/22
Inventor 孔泳徐斓魏永
Owner CHANGZHOU UNIV
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