Carbon aerogel for improving divalent Fe reducibility and hydrogen peroxide yield in electrode as well as preparation method and application thereof

A technology of carbon aerogel and hydrogen peroxide, which is applied in the field of water treatment, can solve the problems of low 2-electron selectivity of oxygen reduction, reduce the productivity of 2-electron oxygen reduction, wide pH range, etc., and achieve good electrocatalysis Activity, excellent mechanical strength and stability, uniform particle size effect

Active Publication Date: 2020-06-23
TONGJI UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the traditional Fenton, the electro-Fenton system has fast reaction speed, low toxicity, wide pH range, and no sludge generation. It is a promising and efficient treatment method. At the same time, there are problems: 2 Electron selectivity is not so high that H 2 o 2 The output is low, the catalyst is easy to fall off and deactivate, etc.
However, in the integrated heterogeneous electro-Fenton system, the traditional iron-based catalyst Fe 3 o 4 The introduction of , although it improves the activity of the oxygen reduction reaction, it will change its selectivity and increase the selectivity of the 4-electron oxygen reduction, thereby greatly reducing the generation of H from the 2-electron oxygen reduction 2 o 2 Yield of

Method used

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  • Carbon aerogel for improving divalent Fe reducibility and hydrogen peroxide yield in electrode as well as preparation method and application thereof
  • Carbon aerogel for improving divalent Fe reducibility and hydrogen peroxide yield in electrode as well as preparation method and application thereof
  • Carbon aerogel for improving divalent Fe reducibility and hydrogen peroxide yield in electrode as well as preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0039] Aiming at the problems of heterogeneous E-Fenton system catalyst construction instability and low oxygen reduction 2 electron selectivity and low OH yield in the system, an in-situ formed method is provided to improve the reduction of divalent Fe in the electrode and the hydrogen peroxide Fe 3 o 4 / FeS x Preparation method of carbon airgel cathode.

[0040] Fe in this example 3 o 4 / FeS x The specific preparation steps of carbon airgel are as follows:

[0041] Mix resorcinol, formaldehyde, water and sodium carbonate with a molar ratio of 1:2:17.5:0.0008, stir well, add m Fe / m (Fe+C) = 3% iron acetylacetonate with m S / m (S+C) = 3% thiourea, mixed evenly and poured into a glass mold for sealing; place the glass mold at a constant temperature of 30°C for 24 hours, at a constant temperature of 50°C for 24 hours, and at a constant temperature of 90°C for 72 hours, to form metal wet gel by polycondensation, and the prepared wet gel The gel was soaked in acetone fo...

Embodiment 2

[0045] Aiming at the problems of heterogeneous E-Fenton system catalyst construction instability and low oxygen reduction 2 electron selectivity and low OH yield in the system, an in-situ formed method is provided to improve the reduction of divalent Fe in the electrode and the hydrogen peroxide Fe 3 o 4 / FeS x A preparation method of a carbon airgel cathode, the material improves the stability of the electrode and the 2-electron selectivity of oxygen reduction, enhances the ability to generate OH free radicals, and can be used to achieve efficient mineralization and degradation of DMP and 3-chlorophenol. Using high performance liquid chromatography (HPLC), total organic carbon analyzer (TOC) and other characterization techniques showed 3 o 4 / FeS x The degradation ability of carbon airgel cathode for DMP and 3-CP. Using advanced transmission electron microscopy, X-ray diffraction and other characterization techniques, it was shown that Fe 3 o 4 and FeS x Formed in sit...

Embodiment 3

[0051] The difference from Example 2 is that the carbon aerogel passes CO 2 During activation, the temperature was raised to 850°C at a rate of 5°C per minute.

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Abstract

The invention relates to a carbon aerogel for improving divalent Fe reducibility and hydrogen peroxide yield in an electrode as well as a preparation method and an application thereof. A metal oxide and a metal sulfide grow in a carbon material skeleton in situ; according to the invention, a novel Fe3O4 / FeSx co-doped carbon aerogel material is provided as an efficient cathode electrode of a heterogeneous electro-Fenton system; the cathode has a high specific surface area, good electrocatalytic activity and 2-electron selectivity, the aerogel can be used for deep degradation of pollutants afterbeing activated, feasibility is provided for efficient mineralization and degradation of DMP and 3-CP under acidic conditions, and the aerogel has a very wide application prospect in actual sewage treatment. Compared with the prior art, the method has the advantages that the pollutant removal rate is high, the iron-sulfur leaching rate is low, and the effective degradation efficiency is still kept after multiple times of repetition.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a carbon aerogel for improving the reduction of divalent Fe in electrodes and the production of hydrogen peroxide, its preparation method and application. Background technique [0002] Dimethyl phthalate (DMP) is ubiquitous in the environment and is an endocrine disruptor. DMP mainly enters the human body through the food chain, breathing and direct contact. It can irritate the conjunctiva of the eyes and even cause burns. When it accumulates in the human body to a certain extent, it can cause gastrointestinal irritation, central nervous system depression, paralysis, blood pressure degradation, and more serious can cause abnormalities in the reproductive system. Chlorophenols (CPS) are a ubiquitous class of compounds and intermediates used in a wide variety of manufacturing industries including pesticides, wood preservatives, herbicides and dyes. DMP and 3-chlorophenol ...

Claims

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Application Information

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IPC IPC(8): C02F1/461C02F1/72B01J13/00
CPCC02F1/4672C02F1/46109B01J13/0091C02F2001/46133C02F2305/026
Inventor 赵红颖田清岭赵国华
Owner TONGJI UNIV
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