Method for removing hard calcium ions in water through S element modified graphene electrode

A technology of graphene electrodes and calcium ions, applied in the direction of separation methods, chemical instruments and methods, water pollutants, etc., can solve problems such as blocking pipelines and equipment, reducing the cross-sectional area of ​​pipelines and equipment, and reducing the flow of circulating water. Short, environmentally friendly and pollution-free preparation process, simple and easy preparation method

Inactive Publication Date: 2016-09-28
CHANGZHOU UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessive hardness in industrial water will lead to scaling on the walls of pipes and equipment during recovery or recycling, reducing the cross-sectional area of ​​pipes and equipment, reducing the flow of circulating water, and even blocking pipes and equipment, causing serious damage to production. Serious consequences

Method used

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  • Method for removing hard calcium ions in water through S element modified graphene electrode
  • Method for removing hard calcium ions in water through S element modified graphene electrode
  • Method for removing hard calcium ions in water through S element modified graphene electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Preparation of sulfur-doped graphene airgel material paper electrode includes the following steps:

[0020] (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.

[0021] (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

[0023] The preparation process of the sulfur-doped graphene airgel paper electrode is the same as that of Example 1.

[0024] The prepared nitrogen-doped graphene airgel paper electrodes were used for 0.25, 0.4, 0.8, 1, 3 and 6 mM Ca 2+ Electrochemical treatment of the solution, the applied voltage is 0.3V, the treatment time is 2min, Ca 2+ The removal rate see figure 2 , it can be seen that the nitrogen-doped graphene airgel material has a low concentration of Ca 2+ The solution has a better adsorption effect. .

Embodiment 3

[0026] The preparation process of the sulfur-doped graphene airgel paper electrode is the same as that of Example 1.

[0027] Cyclic electrosorption experiments on sulfur-doped graphene airgel paper electrodes. Place the sulfur-doped graphene airgel paper electrode in 80 mL of Ca 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 Ca 2+ The removal rate was 72.3%. After 30 cycles of use, the electrode paired with Ca 2+ The removal rate was 70.7%, and the removal rate by electrosorption decreased significantly when the cycle experiment was continued.

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Abstract

The invention relates to a method for removing hard calcium ions in water through an S element modified graphene electrode. The method comprises the following steps: preparing sulfur-doping graphene aerogel, preparing a sulfur-doping graphene aerogel paper electrode, and adsorbing different calcium ions through the paper electrode under a three-electrode system. The method for removing the hard calcium ions in the water through the S element modified graphene electrode has the beneficial effects: the preparation method of the sulfur-doping graphene aerogel is simple, convenient and feasible, the preparation process is environmentally-friendly without pollution, the electrode modified by those materials has high adsorption efficiency and speed to the calcium ions in the water and has simple and convenient adsorption operations, and a hardness problem of the water can be effectively reduced.

Description

technical field [0001] The invention relates to a method for removing hardness calcium ions in water by modifying graphene electrodes with S elements, and belongs to the fields of waste water treatment and material synthesis. technical background [0002] Water can be divided into hard water and soft water. The standard to measure hard water and soft water is the concentration of calcium and magnesium ions. Water containing a large amount of calcium and magnesium ions is called hard water, while water containing no or very small amounts of calcium and magnesium ions is called soft water. Excessive hardness in industrial water will lead to fouling on the walls of pipes and equipment during the process of recycling or recycling, reducing the cross-sectional area of ​​pipes and equipment, reducing the flow of circulating water, and even blocking pipes and equipment, causing serious damage to production. Serious consequences. In life, if the hardness of water is too high, it w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469C02F101/20
CPCC02F1/469C02F2101/20C02F2303/22
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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