Electrode material suitable for Electro-Fenton depredation of pollutants, preparation method and application

A technology for electrode materials and pollutants, applied in the field of electrode materials for electro-Fenton degradation of pollutants, can solve the problems of low oxygen reduction 2 electron selectivity, unstable catalyst structure, low dehalogenation efficiency, etc., and achieves a basic particle size. Consistent, easily controlled reaction conditions, uniform particle distribution

Inactive Publication Date: 2019-10-18
TONGJI UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide an electrode material, preparation method and application suitable for electro-Fenton degradation of pollutants, aiming at the low dehalogenation efficiency of the heterogeneous E-Fenton system, unstable catalyst construction and oxygen reduction 2 electron selection in the system The problem of low stability and low OH yield, the material improves the stability of the electrode and the 2-electron selectivity of oxygen reduction, and endows the electrode with the ability to reduce and dehalogenate

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  • Electrode material suitable for Electro-Fenton depredation of pollutants, preparation method and application

Examples

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Effect test

Embodiment 1

[0047] For heterogeneous E-Fenton system H 2 o 2 Due to the problems of low yield, low dehalogenation efficiency, and unstable catalyst construction, a method for preparing a carbon airgel cathode with in-situ formation of PdFe nano-alloy and defective carbon is provided, which improves the stability of the electrode and the oxygen The reduced 2-electron selectivity enhances the ability to generate OH radicals and endows the electrode with the ability to reductively dehalogenate the active hydrogen. When applied to the degradation of halogen-containing organic pollutants, a cathodic reduction-oxidation synergistic electrochemical system was established to achieve efficient and complete mineralization degradation of 3-chlorophenol.

[0048] The specific preparation steps of PdFe nano-alloy carbon airgel in this embodiment are as follows:

[0049] (1) Weigh an appropriate amount of resorcinol, formaldehyde, water, and sodium carbonate, and then mix them with a molar ratio of r...

Embodiment 2

[0052] For heterogeneous E-Fenton system H 2 o 2 Due to the problems of low yield, low dehalogenation efficiency, and unstable catalyst construction, a method for preparing a carbon airgel cathode with in-situ formation of PdFe nano-alloy and defective carbon is provided, which improves the stability of the electrode and the oxygen The reduced 2-electron selectivity enhances the ability to generate OH radicals and endows the electrode with the ability to reductively dehalogenate the active hydrogen. In order to improve the safety of drinking water and reduce the risk of carcinogenicity in drinking water, when this electrode is applied to the degradation of disinfection by-products of haloacetamides ubiquitous in tap water, a cathodic reduction-oxidation synergistic electrochemical system is established to realize a Rapid dehalogenation pathway.

[0053] (1) Weigh an appropriate amount of resorcinol, formaldehyde, water, and sodium carbonate, and then mix them with a molar ra...

Embodiment 3

[0056] For heterogeneous E-Fenton system H 2 o 2 Due to the problems of low yield, low dehalogenation efficiency, and unstable catalyst construction, a method for preparing a carbon airgel cathode with in-situ formation of PdFe nano-alloy and defective carbon is provided, which improves the stability of the electrode and the oxygen The reduced 2-electron selectivity enhances the ability to generate OH radicals and endows the electrode with the ability to reductively dehalogenate the active hydrogen. Using advanced transmission electron microscopy, X-ray diffraction and Raman spectroscopy characterization techniques, it was shown that the structure of alloys and defective carbon was formed in situ in carbon aerogels.

[0057] (1) Weigh an appropriate amount of resorcinol, formaldehyde, water, and sodium carbonate, and then mix them with a molar ratio of resorcinol: formaldehyde: water: sodium carbonate of 1.5:2:17.5:0.0008, and mix well. After stirring evenly, add: (i)m Fe / ...

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Abstract

The invention discloses a block type electrode material suitable for Electro-Fenton depredation of pollutants. The block type electrode material suitable for the Electro-Fenton depredation of the pollutants is a material with high 2-electron oxygen reduction selectivity, and has enhanced active hydrogen reduction capacity and Fenton activity, so that the mineralization efficiency of a heterogeneous E-Fenton system is improved, and the service life of an electrode is prolonged; and the electrode generates H2O2 in situ and decomposes H2O2 to.OH in situ. The electrode material is a PdFe nano-alloy carbon aerogel cathode, and a PdFe nano-alloy and an abundant defect carbon structure are formed in situ in a carbon aerogel skeleton. The invention further discloses a preparation method of the block type electrode material and application of the block type electrode material in degradation or removal of the pollutants. Compared with the prior art, the selectivity of the 2 electron ORR of the PdFe alloy carbon aerogel is increased to 80%, the reduction dehalogenation and oxidation capacity is enhanced, and the electrocatalytic activity is greatly enhanced, and the removal rate and the dehalogenation rate of TOC of 3-chlorophenol reach 100% in 6 hours. The block type electrode material suitable for Electro-Fenton depredation of the pollutants can be used for deep degradation of halogen-containing pollutants, provides the feasibility for complete mineralization and degradation of the 3-chlorophenol under mild conditions, and has a very broad application prospect in the actual sewage treatment.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to an electrode material suitable for electro-fenton degradation of pollutants, a preparation method and an application. Background technique [0002] Chlorophenols (CP S ) are a class of ubiquitous compounds and intermediates that are widely used in various manufacturing industries such as pesticides, wood preservatives, herbicides and dyes. Among them, 3-chlorophenol (3-CP) can cause serious environmental problems and even harm humans due to its high endocrine disrupting ability, genotoxicity, carcinogenicity and strong bioaccumulation. Halogenated ethylamines (HAMS), an emerging disinfection by-product (DBP) found in tap water, have received considerable attention due to their genotoxicity and cytotoxicity. Due to the presence of chlorine atoms, the biodegradability of such organic pollutants is poor, so their biodegradation is severely limited. Develop more economical a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/72C02F1/70C02F101/36C02F101/34
CPCC02F1/46109C02F1/4672C02F1/4676C02F2001/46133C02F2101/345C02F2101/36C02F2201/4619C02F2305/026
Inventor 赵红颖沈旭茜赵国华
Owner TONGJI UNIV
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