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Preparation method for activated carbon aerogel electrode loaded with iron with mixed valences and applications

A technology of carbon airgel and mixed valence state, applied in the field of water treatment, can solve the problems of increased treatment cost, complicated treatment process, loss of catalytic effect, etc., achieve stable and high efficiency, improve dispersion, and increase in-situ production Effect

Inactive Publication Date: 2013-12-04
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pH of the current electro-Fenton treatment method is better in the range of 2 to 4, while under near-neutral conditions, iron ions are prone to precipitate and lose their catalytic effect, and the treatment effect becomes poor; and the subsequent neutralization treatment produces a large amount of For iron sludge, the treatment process becomes complicated and the treatment cost increases, which hinders its wide application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of carbon aerogels

[0031] Sol-gel phenolic polymerization method, using resorcinol and formaldehyde as raw materials, sodium carbonate as catalyst, and standing at a molar ratio of 1:2:0.008:17.5 to obtain a phenolic resin with a network structure; The appearance size of the electrode material is required to prepare a mold. The mold is generally a test tube with a diameter of 1.5cm and a length of about 20cm. The rod-shaped phenolic resin obtained after standing is subjected to solvent replacement in acetone with low surface tension for 5 days, and the water molecules in its network structure are replaced by acetone, and then dried at room temperature for about 5 days. The dried aerogel was heated to 950 °C in a tube furnace and kept for 4 h for carbonization to obtain a black rod-shaped carbon aerogel.

[0032] (2) Activation of carbon aerogels

[0033] The carbon aerogel prepared in step (1) is raised to 850°C at a rate of 1.5-5.5°C / min in a tube f...

Embodiment 2

[0037] Fe(mix) / ACA electrode is used in electroadsorption-Fenton process to treat wastewater containing pesticide imidacloprid to achieve fast and efficient removal of pollutants.

[0038] The degradation device uses the Fe(mix) / ACA electrode as the cathode and the BDD electrode as the anode, and uses a DC stabilized power supply to provide the required voltage and control the constant potential voltage of -30 to +20V. The relevant process parameters in the above method are: the water sample processing volume is 30-100ml, the electrode area can be 2-10cm2, the electrode spacing is kept at 0.5-3cm, and the potential of the control working electrode is -30-+10V. In the above method, constant potential electrosorption is carried out, and the treatment time is between 20-60min. In the actual application process, the corresponding treatment time is controlled according to the nature of the treated wastewater, the amount of water and the area of ​​the electrode, so as to meet the fin...

Embodiment 3

[0040] Fe(mix) / ACA electrode was used in electroadsorption-Fenton process to treat wastewater containing antiepileptic drug carbamazepine to achieve fast and efficient removal of pollutants.

[0041] The degradation device uses the Fe(mix) / ACA electrode as the cathode and the BDD electrode as the anode, and uses a DC stabilized power supply to provide the required voltage and control the constant potential voltage of -30 to +20V. The relevant process parameters in the above method are: the water sample processing volume is 30-100ml, the electrode area can be 2-10cm2, the electrode spacing is kept at 0.5-3cm, and the potential of the control working electrode is -30-+10V. In the above method, constant potential electrosorption is carried out, and the treatment time is between 20-60min. In the actual application process, the corresponding treatment time is controlled according to the nature of the treated wastewater, the amount of water and the area of ​​the electrode, so as to m...

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Abstract

The invention relates to a preparation method for activated carbon aerogel electrode loaded with iron with mixed valences and applications. Iron with mixed valences obtained through hydro-thermal oxidation process is loaded on a surface of a matrix with high specific surface area and prepared through CO2 activating treatment, A Fe(mix) / ACA combined electrode is constructed. The electrode is used as a cathode in electro-adsorption auxiliary electro-Fenton, and degrades organic pollutants rapidly. Compared to the prior art, the activated carbon aerogel electrode loaded with iron with mixed valences has advantages of high poriness, large specific surface area, high conductivity, controllable appearance shape and the like. In addition, the electrode has good electro-Fenton catalytic activity, and is suitable for rapid degradation of organic waste water by electro-adsorption-Fenton catalytic oxidation. Under the action of electro-adsorption auxiliary enhancement, pollutants in sewage is degraded and removed efficiently and thoroughly. The technology has simple operation, is low-cost, is a new, efficient and energy saving technology and has wide economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a preparation method of an Fe(mix) / ACA electrode and the application of the electro-Fenton method for degrading organic wastewater under the synergistic effect of electro-adsorption. Background technique [0002] The aggravation of water pollution and scarcity of water resources has become a hot issue today. How to deal with pollutants in water bodies quickly and effectively has always been a topic that environmental protection workers have been working hard to explore. In recent years, ozone (O 3 The emergence of advanced oxidation technology (Advanced Oxidation Processes referred to as AOP) represented by ) oxidation, electrochemical oxidation, photocatalytic oxidation, and ultrasonic synergistic oxidation has provided us with new ideas for treating pollutants in water. The most notable feature of advanced oxidation technology is that hydroxyl radicals ( OH...

Claims

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Application Information

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IPC IPC(8): C02F1/469C02F1/72
Inventor 赵国华王宇晶赵红颖柴守宁王亚波
Owner TONGJI UNIV
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