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Method for removing hard calcium ions in water by N and S element synergistically modified graphene electrodes

A graphene electrode, calcium ion technology, applied in descaling and water softening, chemical instruments and methods, water/sewage treatment, etc., can solve the problem of reducing circulating water flow, blocking pipes and equipment, reducing the cross-sectional area of ​​pipes and equipment The problem is that the preparation method is simple and feasible, the time is short, and the electrosorption performance is improved.

Inactive Publication Date: 2016-12-07
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • 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 by N and S element synergistically modified graphene electrodes
  • Method for removing hard calcium ions in water by N and S element synergistically modified graphene electrodes
  • Method for removing hard calcium ions in water by N and S element synergistically modified graphene electrodes

Examples

Experimental program
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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 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

[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. A nitrogen-sulfur co-doped graphene airgel paper electrode was placed 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. The experimental results are as image 3 shown. The first adsorption of Ca 2+ The removal rate was 67.5%, and after 30 cycles of use, the electrode paired with Ca 2+ The removal rate was 65.7%, and then the electro-adsorption cycle experiment was continued, and the electro-adsorption removal rate decreased gradually.

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Abstract

The invention relates to a method for removing hard calcium ions in water by N and S element synergistically modified graphene electrodes. The method includes: preparing nitrogen-sulfide co-doped graphene aerogel, preparing nitrogen-sulfide co-doped graphene aerogel paper electrodes, and adopting the paper electrodes for electro-adsorption of the calcium ions under a three-electrode system. The method for preparing the nitrogen-sulfide co-doped graphene aerogel is simple, convenient and feasible, environment friendliness and freeness of pollution are realized in the preparation process, the modified electrodes are high in efficiency and speed of adsorption of the calcium ions in water, simplicity and convenience in operation are realized, and the problem of high water hardness can be effectively solved.

Description

technical field [0001] The invention relates to a method for synergistically modifying graphene electrodes with N and S elements to remove hardness calcium ions in water, belonging to the fields of 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 to...

Claims

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Application Information

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IPC IPC(8): C02F5/00
CPCC02F5/00C02F1/46109C02F1/469C02F2001/46133
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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