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Method for removing ferric ion in water by using N element modified graphene electrode

A technology of graphene electrodes and iron ions, applied in separation methods, chemical instruments and methods, water/sewage treatment, etc., can solve problems affecting graphite performance, etc., and achieve the effect of simple operation, simple and easy preparation method, and short time

Inactive Publication Date: 2016-12-14
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of preparing graphene, due to the π-π bonds and van der Waals forces in graphene, it may cause irreversible aggregation or re-stacking into a graphite structure, which will affect the performance of graphite.

Method used

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  • Method for removing ferric ion in water by using N element modified graphene electrode
  • Method for removing ferric ion in water by using N element modified graphene electrode
  • Method for removing ferric ion in water by using N element modified graphene electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation of nitrogen-doped hydrogel material paper electrode includes the following steps:

[0023] (1) Disperse 0.2 g of graphene oxide (GO) ultrasonically in 100 ml of distilled water, add 6 g of urea, and stir mechanically for 15 minutes. Pour the mixed solution into a hydrothermal reaction kettle and heat to 180°C for 12 hours. The resulting product was immersed in distilled water for 3 to 4 days, and finally the sample was freeze-dried at -50°C for 24 hours to obtain nitrogen-doped graphene aerogel.

[0024] (2) Add 90 mg of the nitrogen-doped graphene aerogel material prepared in step (1) to 2 mL of 4 wt% polyvinyl alcohol solution, and ultrasonically make the composite material uniformly dispersed in the solution. Take 0.16 mL of the above dispersion and evenly smear it on a 20mm×5mm hard paper sheet (thickness 400μm), freeze-dry and dry it at -50°C for 4h to make a nitrogen-doped graphene aerogel paper electrode.

[0025] The prepared nitrogen-doped graphene a...

Embodiment 2

[0027] The preparation process of the nitrogen-doped graphene aerogel paper electrode is the same as in the first embodiment.

[0028] Cyclic electro-adsorption experiments were performed on nitrogen-doped graphene aerogel paper electrodes. Place the nitrogen-doped graphene aerogel paper electrode in 80 mL Fe with a concentration of 0.25 mmol / L 3+ In the solution, apply a potential of -0.3V, and record the conductivity of the solution. After 2 minutes, record the conductivity of the solution again to calculate the removal rate. Then the potential is removed to allow it to desorb, and the cycle continues for many times. The experimental results are as image 3 Shown. First adsorption of Fe 3+ The removal rate is 73.3%. After 80 cycles of use, the electrode pair Fe 3+ The removal rate is 64.8%, and the removal effect is slightly reduced.

Embodiment 3

[0030] The preparation process of the nitrogen-doped graphene aerogel paper electrode is the same as in the first embodiment.

[0031] Nitrogen-doped graphene aerogel paper electrode prepared for 3mM Fe 3+ For electrochemical treatment of the solution, the applied voltage was -0.3V and the treatment time was 2 min. Such as Figure 4 As shown, the nitrogen-doped graphene aerogel paper electrode pairs Fe 3+ The removal rate is 58.8%.

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Abstract

The invention relates to a method for removing ferric ion in water by using N element modified graphene electrode. which comprises the following steps: preparing a nitrogen doped graphene aerogel, preparing a nitrogen doped graphene aerogel electrode, and adsorbing and desorbing iron ions on in water by regulation of the voltage on the electrodes. The invention has the following beneficial effects: the preparation method of the nitrogen doped graphene aerogel is simple; the preparation process has no environmental pollution; the electrode modified by the material has high adsorption efficiency, high speed and simple operation on iron ions in water; and the recycling performance of material has increased dramatically compared with the material in the prior art.

Description

Technical field [0001] The invention relates to a method for removing iron ions from water by an N element modified graphene electrode, and belongs to the field of wastewater treatment and material synthesis. technical background [0002] At present, the purification treatment of iron-containing wastewater mainly includes the following processes: extraction method, biological method, ion exchange method, oxidation precipitation method, adsorption method, etc. The above methods have their own advantages and disadvantages. In contrast, the adsorption method is simple to operate, does not introduce impurity ions, and has low equipment costs. It is the most widely used method. The carbonaceous material is a very good adsorbent, which can effectively remove a variety of pollutants in the gas and liquid phases. [0003] The materials used for electrosorption include activated carbon, carbon nanotubes and other carbon-containing materials. Graphene is a two-dimensional carbon material, ...

Claims

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Application Information

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IPC IPC(8): C02F1/461C02F1/469C02F1/64
CPCC02F1/46109C02F1/469C02F2001/46133
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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