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Graphene aerogel electrode material loaded with copper ions and preparation method thereof

A graphene aerogel, graphene hydrogel technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as electrode formation, difficulty, reaction rate limitation, etc. Stable high efficiency, avoiding the production of iron sludge, and accelerating the transfer rate

Active Publication Date: 2017-11-07
CHONGQING THREE GORGES UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently, electro-Fenton systems can achieve Fe under acidic conditions 2+ with Fe 3+ circulation, reduce the generation of iron sludge, and improve the catalytic efficiency, but when the pH>6, Fe 3+ Difficult to be H 2 o 2 reduced to Fe 2+ , will produce iron sludge, and at the same time regeneration is difficult, which limits the reaction rate and reduces the degradation effect
Although, replacing iron ions with other transition metal ions (such as Cu + / Cu 2+ ) can solve the problem of iron sludge, but the electro-Fenton system still has the problem of narrow application pH range, which makes regeneration difficult and the reaction rate is limited. technical problem

Method used

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  • Graphene aerogel electrode material loaded with copper ions and preparation method thereof
  • Graphene aerogel electrode material loaded with copper ions and preparation method thereof
  • Graphene aerogel electrode material loaded with copper ions and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0023] The present embodiment prepares the graphene airgel electrode of loading copper ion, specifically comprises the following steps:

[0024] (1) Ultrasonic dispersion of graphite oxide to complete mixing, to obtain a graphene oxide solution with a mass concentration of 3 mg / mL;

[0025] (2) the graphene oxide solution prepared in step (1) is subjected to hydrothermal treatment to obtain a graphene hydrogel loaded with copper ions;

[0026] (3) The graphene hydrogel gel loaded with copper ions prepared in step (2) is subjected to vacuum freeze-drying to prepare the graphene airgel electrode material loaded with copper ions.

[0027] The graphene oxide described in step (1) is prepared by an improved Hummer method.

[0028] The specific process for preparing graphene oxide by the improved Hummer method: Weigh natural flake graphite powder (10 g) and sodium nitrate (5 g) into concentrated sulfuric acid (260 mL), and continuously stir for 2 h under ice bath conditions. After...

Embodiment 2

[0033] With the graphene airgel electrode material that embodiment one makes, do XRD test:

[0034] XRD-6000 X-ray diffractometer was used, the radiation source was CuKα target, the voltage was 40kV, the current was 30mA, the scanning angle was 15-80°, and the scanning speed was 4° / min. Its X-ray powder diffraction pattern is as figure 1 shown.

[0035] The graphene airgel electrode material has diffraction angle 2θ at 29.689±0.2°, 36.547±0.2°, 42.484±0.2°, 52.686±0.2°, 61.646±0.2°, 73.858±0.2°, 77.738±0.2° Diffraction peaks.

[0036] Graphene airgel electrode material of the present invention, its powder X-ray diagram expresses with interplanar spacing D, Bragg angle (2θ), index (hkl) and intensity (I value) crystal form, as follows:

[0037] Diffraction peak number

[0038] The graphene airgel electrode material that embodiment one makes is placed under the Quanta 400F type scanning electron microscope and observes, and it can be seen that the graphene airgel el...

Embodiment 3

[0040] Graphene airgel electrodes loaded with copper ions are applied to degrade rhodamine B in the electro-Fenton system:

[0041] The electrode is used in the electro-Fenton system, using rhodamine B to simulate the organic wastewater to be degraded, the concentration is 10mg / L, the water sample treatment volume is 50mL, the platinum sheet is used as the anode, and the graphene airgel loaded with copper ions The electrode is the cathode, and the electrode area is 1cm 2 (Length 1cm, width 1cm), using a DC power supply to provide the current required for the degradation process, the current density is 30mA / cm 2 , electrolyte (anhydrous NaSO 4 ) concentration is 0.1mol / L, the electrode distance is kept at 1.5cm, the treatment time is 30min, the pH range is 3-8, and the whole process is aerated.

[0042] Under the same reaction conditions, compared with the degradation efficiency of graphene airgel electrode as cathode material, the degradation efficiency of graphene airgel elec...

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Abstract

The invention relates to a graphene aerogel electrode material loaded with copper ions. The diffraction angle 2 theta of the crystal form has diffraction peaks at 29.689 + / - 0.2 degrees, 36.547 + / - 0.2 degrees, 42.484 + / - 0.2 degrees, 52.686 + / - 0.2 degrees, 61.646 + / - 0.2 degrees, 73.858 + / - 0.2 degrees and 77.738 + / - 0.2 degrees. The graphene aerogel electrode material provided by the invention has ultrahigh adsorption capacity to organic dyestuff wastewater, is capable of assisting in promoting electricity-fenton reaction efficiency and is capable of effectively avoiding iron sludge generation; the graphene aerogel electrode material loaded with copper ions applied to the electricity-fenton system not only can keep high degradation rate under the condition of pH equal to 3 but also can keep higher degradation rate under the condition of pH equal to 7; the excellent electrical conductivity of the graphene aerogel can effectively increase the transfer rate of the electrons on the surface of the graphene aerogel electrode material loaded with copper ions and can further accelerate the continuous in-situ generation of H2O2 at cathode; H2O2 also reacts with an electrode-loaded copper ionic catalyst so as to generate. OH, so that stable high efficiency in the electricity-fenton process can be kept.

Description

technical field [0001] The invention relates to a graphene airgel electrode material loaded with copper ions and a preparation method thereof. Background technique [0002] The intensification of water pollution poses a great threat to both organisms and human bodies. In recent years, organic pollutants in industrial wastewater account for a high proportion. Therefore, how to quickly and effectively remove organic matter in wastewater has become a research hotspot. Advanced oxidation technology has been widely valued due to its high degradation ability, simple operation and strong oxidation ability. Electro-Fenton method is a kind of advanced oxidation technology. This system uses highly active OH to react with organic pollutants in water and remove them by oxidation. Currently, electro-Fenton systems can achieve Fe under acidic conditions 2+ with Fe 3+ circulation, reduce the generation of iron sludge, and improve the catalytic efficiency, but when the pH>6, Fe 3+ Di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F101/30
CPCC02F1/46109C02F2001/46142C02F2101/30
Inventor 曹晓龙产文王利峰李轩直王文涛
Owner CHONGQING THREE GORGES UNIV
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