One-step synthesis of sulfur-doped graphene airgel and its electrosorption removal of various heavy metal ions

A technology of sulfur-doped graphene and heavy metal ions, which is applied in the direction of graphene, separation methods, and dispersed particle separation, to achieve high adsorption efficiency, improved electro-adsorption performance, and environmentally friendly and pollution-free preparation process

Active Publication Date: 2018-06-08
江苏智芯今创科技有限公司
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Problems solved by technology

[0005] 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 by doping sulfur atoms in the airgel, the electric adsorption effect between various heavy metal ions can be achieved. conducted research, this method has not been reported, and dithiothreitol was also used for the first time to prepare sulfur-doped graphene airgel

Method used

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  • One-step synthesis of sulfur-doped graphene airgel and its electrosorption removal of various heavy metal ions
  • One-step synthesis of sulfur-doped graphene airgel and its electrosorption removal of various heavy metal ions
  • One-step synthesis of sulfur-doped graphene airgel and its electrosorption removal of various heavy metal ions

Examples

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Embodiment 1

[0021] Preparation of sulfur-doped graphene airgel material paper electrode includes the following steps:

[0022] (1) Ultrasonic disperse 0.15g of graphene oxide (GO) in 100mL of distilled water, then add 0.45g of dithiothreitol, stir it mechanically to make it fully mixed, and then place the mixture in a water bath at 95°C Heat for 2h. After the reaction, the resulting product was immersed in distilled water for 2 to 3 days, and finally the sample was freeze-dried at -52°C for 24 hours to obtain the sulfur-doped graphene airgel.

[0023] (2) Add 90mg of the sulfur-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 sulfur-doped graphene airgel paper electrode.

Embodiment 2

[0025] The preparation process of the sulfur-doped graphene airgel paper electrode is the same as that of Example 1.

[0026] The prepared sulfur-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 the sulfur-doped graphene airgel material has a strong effect on the heavy metal ion Cu 2+ The adsorption effect is the best.

Embodiment 3

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

[0029] Cyclic electrosorption experiments on sulfur-doped graphene airgel paper electrodes. to Cu 2+ Taking the electrosorption as an example, a cyclic electrosorption experiment was carried out on the sulfur-doped graphene airgel paper electrode. Place the sulfur-doped graphene airgel paper electrode in 80 mL of CuSO with a concentration of 1 mmol / 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 was 73%, and after 100 cycles of use, the electrode paired Cu 2+ The removal rate was 70.5%. It shows that the material has extremel...

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Abstract

The invention relates to sulfur-doped graphene aerogel synthesized by a one-step method and electric adsorption removal of the sulfur-doped graphene aerogel on various heavy metal ions. The sulfur-doped graphene aerogel is prepared through the following steps that the sulfur-doped graphene aerogel is prepared; a sulfur-doped graphene aerogel paper electrode is prepared; different heavy metal ions are adsorbed through paper electrodes under a three-electrode system. The sulfur-doped graphene aerogel has the beneficial effects that the preparation method of the sulfur-doped graphene aerogel is simple and convenient; the implementation is easy; the environment-friendly and pollution-free effects are achieved in the preparation process, so that the electrode modified by the materials has high adsorption efficiency and high speed on the heavy metal ions in the water; the operation is simple and convenient; the electric adsorption effect on different heavy metal ions are compared.

Description

technical field [0001] The invention relates to one-step synthesis of sulfur-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] 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 metal ions 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 investment, long service l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/469C02F1/62C01B32/184
CPCC01P2002/82C02F1/469
Inventor 孔泳徐斓魏永
Owner 江苏智芯今创科技有限公司
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