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Preparation method of Fe-FeOx/carbon aerogel self-supporting cathode and heterogeneous electro-Fenton methyl orange degradation system

A carbon aerogel, self-supporting technology, used in chemical instruments and methods, water/sludge/sewage treatment, water/sewage treatment, etc., which can solve harsh reaction conditions, difficult to form substrate materials, and difficult to degrade azo dyes and other problems to achieve the effect of strengthening the degradation effect

Inactive Publication Date: 2017-11-07
DALIAN UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention mainly aims at the problems of harsh homogeneous electro-Fenton reaction conditions in the current electrochemical oxidation process, difficult formation of substrate materials and difficult degradation of azo dyes, etc., and prepares a self-supporting FCAs cathode material, through the process of heterogeneous electro-Fenton Method for degrading methyl orange

Method used

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  • Preparation method of Fe-FeOx/carbon aerogel self-supporting cathode and heterogeneous electro-Fenton methyl orange degradation system
  • Preparation method of Fe-FeOx/carbon aerogel self-supporting cathode and heterogeneous electro-Fenton methyl orange degradation system
  • Preparation method of Fe-FeOx/carbon aerogel self-supporting cathode and heterogeneous electro-Fenton methyl orange degradation system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Comparison of adsorption performance and electrochemical oxidation performance of different electrode materials (Fe loads are 0%, 0.5%, 5%) on methyl orange decolorization effect comparison test and different Fe loads on methyl orange decolorization effect impact testing.

[0027] Reaction conditions: prepare methyl orange simulated wastewater 150mg / L, add appropriate amount of Na 2 SO 4 To adjust the conductivity of the solution, add 60mL of the above solution to the cathode and anode chambers respectively, and use FCAs electrodes with Fe loads of 0%, 0.5% and 5% as cathodes. At pH=7, the aeration rate is 1.4L / min. Under the conditions of 0mA and 50mA, react for 180min, measure the concentration of methyl orange and calculate its decolorization rate.

[0028] The result is shown in Figure 2: Figure 2.1It is a cathode material with Fe loading of 0%. The results show that the decolorization effect of methyl orange is not very different between its adsorpti...

Embodiment 2

[0029] Example 2: Using an FCAs electrode with a Fe load of 5% as a cathode, the influence of current on the decolorization effect of methyl orange was investigated.

[0030] Reaction conditions: prepare methyl orange simulated wastewater 150mg / L, add appropriate amount of Na 2 SO 4 Adjust the conductivity of the solution, add 60mL of the above solution to the cathode and anode chambers, use the FCAs electrode with a Fe load of 5% as the cathode, and the aeration rate is 1.4L / min, pH=7, and the investigation current is 10mA, 30mA and 50mA Under the conditions of 180min, the decolorization rate of methyl orange.

[0031] The result is as image 3 Shown: With the increase of current, the decolorization rate of methyl orange is obviously enhanced, after 180min, under the condition of 10mA, 30mA and 50mA, the decolorization rate is 52.59%, 77.05% and 100% respectively.

Embodiment 3

[0032] Example 3: Using the FCAs electrode with a Fe load of 5% as the cathode, the influence of the amount of aeration on the decolorization effect of methyl orange was investigated.

[0033] Reaction conditions: prepare methyl orange simulated wastewater 150mg / L, add appropriate amount of Na 2 SO 4 Adjust the conductivity of the solution, add 60mL of the above solution to the cathode and anode chambers respectively, use the FCAs electrode with a Fe load of 5% as the cathode, and check the aeration rate at 0L / min and 0.7L / min at a current of 50mA and pH=7 And 1.4L / min conditions, reaction 180min, the decolorization rate of methyl orange.

[0034] The result is as Figure 4 Shown: With the increase of aeration, the decolorization rate of methyl orange is obviously enhanced. After 180min, under the conditions of 0L / min, 0.7L / min and 1.4L / min, the decolorization rate is 48.79%, 95.10% respectively and 100%.

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Abstract

The invention provides a preparation method of a Fe-FeOx / carbon aerogel self-supporting cathode and a heterogeneous electro-Fenton methyl orange degradation system, belonging to the technical field of preparation of environmental electrochemical materials and treatment of advanced oxidation techniques. A Fe-FeOx / carbon aerogel electrode is prepared by virtue of a one-step sol-gel synthesis method and is taken as a cathode; a Ti / RuO2-IrO2 electrode is taken as an anode; and methyl orange is degraded in the precise of an additional power supply. Heterogeneous electro-Fenton has a relatively wide pH value range and is suitable for various actual wastewaters; the prepared electrode forms a block body and does not need to be subjected to complex post-processing such as tabletting; H2O2 can be produced in situ, so that the dangers during transportation and storage are avoided, and the cost is lowered; the precipitation of iron is limited, and the catalyst can be recycled; by taking electrons as a reaction agent, the process is clean and environmentally friendly; and beside an catalytic oxidation effect, an electrode material has synergistic effects such as adsorption.

Description

technical field [0001] The invention belongs to the technical field of environmental electrochemical material preparation and advanced oxidation technology for wastewater treatment, and relates to the preparation of cathode materials. The carbon airgel is used as the base to combine Fe-FeO x Loaded on the substrate, and then Fe-FeO x / Carbon aerogels (FCAs) used as cathodes to degrade methyl orange by the electro-Fenton process. Background technique [0002] Electro-Fenton uses clean and efficient electrons as reactants to generate strong oxidizing hydroxyl radicals ( OH), which can degrade various pollutants without selection. The operation is simple, the reaction conditions are easy to control, and the environment is friendly. It has been favored in recent years. extensive attention. The reaction mechanism is based on the H 2 o 2 and Fe 2+ The reaction generates OH and a series of chain reactions occur to degrade pollutants. h 2 o 2 It is the dissolved oxygen in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/72
CPCC02F1/46109C02F1/4672C02F2001/46133C02F2101/308C02F2305/026
Inventor 张国权徐静杨凤林周玉菲
Owner DALIAN UNIV OF TECH
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