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Tannic acid heterogeneous synergistic electro-Fenton method for catalytic degradation of phenol organic wastewater

A technology for organic wastewater and catalytic degradation, applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc., can solve problems such as retardation of the electro-Fenton reaction process and reduced output

Inactive Publication Date: 2021-06-29
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the existing electro-Fenton reaction still has a large amount of iron hydroxide sludge produced in the reaction process so that Fe 2+ The yield is reduced, thereby slowing down the Fe(III) / Fe(II) redox cycle, and then blocking the problem of the progress of the electro-Fenton reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]The specific process steps of adding tannic acid during the degradation process of PNP wastewater are as follows: the cathode material is GO-Fe 3 O 4 / NF (i.e. graphene oxide, ferric oxide, graphene oxide supported ferric oxide modified nickel foam), the anode material is graphite sheet, the waste water to be treated is placed in the pollutant container, the stirrer is turned on, and the external DC is connected power supply. The current density is 10mA / cm 2 , PNP initial concentration is 80mg L -1 , pH=9. Tannic acid was added under these conditions, and the concentration of tannic acid was 40 mg L -1 After 140 min of reaction, samples were taken to measure the PNP content. The calculated removal rate of PNP was 70.1%. The above results show that the method of the present invention effectively realizes the method of degrading phenolic organic wastewater by tannic acid heterogeneous synergistic electro-Fenton method, and has stable degradation performance, stable o...

Embodiment 2

[0033] The specific process steps of adding tannic acid during the degradation process of PNP wastewater are as follows: the cathode material is GO-Fe 3 O 4 / NF, the anode material is graphite sheet, the waste water to be treated is placed in the pollutant container, the stirrer is turned on, and the external DC power supply is connected. The current density is 20mA / cm 2 , PNP initial concentration is 60mg L -1 , pH=7. Add tannic acid under these conditions, the concentration of tannic acid is 40mgL -1 , After 140min of reaction, sample was taken to measure PNP content. The calculated removal rate of PNP was 79.1%. The above results show that the method of the present invention effectively realizes the method of degrading phenolic organic wastewater by tannic acid heterogeneous synergistic electro-Fenton method, and the degradation performance is stable, the operation can be stable, and the effluent quality is stable.

Embodiment 3

[0035] The specific process steps of adding tannic acid during the degradation process of PNP wastewater are as follows: the cathode material is GO-Fe 3 O 4 / NF, the anode material is graphite sheet, the waste water to be treated is placed in the pollutant container, the stirrer is turned on, and the external DC power supply is connected. The current density is 40mA / cm 2 , PNP initial concentration is 40mg L -1 , pH=3. Add tannic acid under these conditions, the concentration of tannic acid is 40mgL -1 , After the reaction for 140min, the samples were taken to measure the PNP content. The calculated removal rate of PNP was 84.5%. The above results show that the method of the present invention effectively realizes the method of degrading phenolic organic wastewater by tannic acid heterogeneous synergistic electro-Fenton method, and the degradation performance is stable, the operation can be stable, and the effluent quality is stable.

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Abstract

The invention discloses a tannic acid heterogeneous synergistic electro-Fenton method for catalytic degradation of phenol organic wastewater, which comprises the following steps that: tannic acid and soluble electrolyte are added into phenol organic wastewater to obtain a mixed solution A; the mixture A is electrolyzed in an electrolysis mode; and in the electrolysis process, a cathode adopts graphene oxide, ferroferric oxide or a graphene oxide loaded ferroferric oxide modified foam electrode, and an anode adopts an inert electrode. The tannic acid and the soluble electrolyte are added into the phenol organic wastewater, the added soluble electrolyte can provide conductive ions to ensure smooth an electrolysis process, the added tannic acid can form a TA-Fe (III) complex to promote the reduction reaction between Fe < 3 + > and Fe < 2 + >, so that the capability of activating H2O2 to generate. OH by Fe < 3 + > is indirectly enhanced, and the speed of degrading the phenol organic pollutants by the electro-Fenton method is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a tannic acid heterogeneous synergistic electro-Fenton method for catalytic degradation of phenolic organic wastewater. Background technique [0002] Phenolic organic pollutants are a class of refractory organic compounds, which are widely present in various water bodies and increasingly pollute the environment. At present, the removal of phenolic organic pollutants is mainly based on physical adsorption and chemical oxidation, and there are also a small amount of biodegradation. Among them, electro-Fenton method, as a new type of electrochemical advanced oxidation technology, has attracted extensive attention due to its strong oxidizing ability and environmental friendly characteristics, and is an important development direction in the field of sewage treatment in the future. However, in the existing electro-Fenton reaction, a large amount of iron hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/72C02F101/34
CPCC02F1/46109C02F1/722C02F2001/46128C02F2101/345
Inventor 周元臻白洋洋张义晨党媛孙小琴
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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