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Preparation method and application of bimetallic oxide loaded activated carbon fiber composite electrode

A bimetallic oxide, activated carbon fiber technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of poor pollutant degradation ability and sulfate activation efficiency It can overcome the problems of low activation efficiency and low activation efficiency, and achieve the effect of overcoming the difficulty of uniformity and easy falling off, improving efficiency and high utilization rate.

Pending Publication Date: 2020-04-24
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, effective persulfate activation methods mainly include metal activation, electroactivation, and carbon-based material activation. Traditional electroactivation methods mainly use metal electrodes such as platinum sheets. Not only the activation efficiency is not high, but also like some active metal electrode iron sheets, etc. It will also produce secondary pollution. In recent years, carbon-based materials have become a popular cathode material, especially activated carbon fiber (ACF) as a cathode has a large specific surface area, low price, no secondary pollution, activatable persulfate and high Conductivity and other advantages
Studies have confirmed that copper ferrite (CuFe 2 o 4 ) is a double metal oxide that can activate persulfate, but there are problems of low persulfate activation efficiency and poor pollutant degradation ability. CuFe 2 o 4 Loaded on the cathode, Fe 2+ and Cu 2+ Activates persulfate to generate Fe 3+ and Cu 3+ , while Fe 3+ and Cu 3+ Under the action of an electric field, electrons can be reduced to Fe 2+ and Cu 2+ , thus improving the reusability of electrodes

Method used

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  • Preparation method and application of bimetallic oxide loaded activated carbon fiber composite electrode
  • Preparation method and application of bimetallic oxide loaded activated carbon fiber composite electrode
  • Preparation method and application of bimetallic oxide loaded activated carbon fiber composite electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) The activated carbon fibers (2×5cm) are soaked and cleaned with nitric acid (1M), sodium hydroxide (1M) and deionized water in turn to remove organic impurities and inorganic impurities on the surface of the activated carbon fibers, and dried for later use;

[0025] (2) The prepared CuFe 2 O 4 The powder is washed 3 to 4 times with absolute ethanol and deionized water, centrifuged to remove impurities, and dried for later use;

[0026] (3) adding a certain amount of PTFE emulsion to deionized water to obtain a 0.1wt% PTFE aqueous solution;

[0027] (4) 0.1 g of CuFe treated in step (2) 2 O 4 The powder was added to the PTFE solution prepared in step (3), and ultrasonicated for 10 min to obtain 0.5wt% uniform CuFe 2 O 4 Dispersions;

[0028] (5) adding the activated carbon fiber treated in step (1) to the CuFe obtained in step (4) 2 O 4 In the dispersion liquid, the water bath was shaken for 15min, placed in a 120 ℃ oven to dry, weighed, CuFe 2 O 4 The load...

Embodiment 2

[0030] Example 2 (comparative example)

[0031] The specific preparation process is the same as that in Example 1, except that step (2) is omitted, no PTFE emulsion is added, and the purpose is that no binder is added, the electrode prepared above is used as the cathode, the platinum sheet is used as the anode, and 0.05M sodium sulfate is used as the Electrolyte, pH=6.7, I=90mA, persulfate 1mM, degrade 300ml of atrazine wastewater with a concentration of 20mg / L, at 60min, the degradation rate of atrazine reaches about 91%, such as image 3 As shown in the middle curve (b), the utilization of persulfate is 51.4%, as Figure 4 It is shown in the histogram (b).

Embodiment 3

[0033] The specific preparation process is the same as that in Example 1, the difference is that the CuFe in step (4) is added 2 O 4The amount becomes 0.05g, resulting in 0.25wt% uniform CuFe 2 O 4 dispersion so that the CuFe in the final composite catalyst 2 O 4 The loading amount of 25%, the electrode prepared above was used as the cathode, the platinum sheet was used as the anode, 0.05M sodium sulfate was used as the electrolyte, pH=6.7, I=90mA, persulfate 1mM, degraded 300ml concentration of 20mg / L Aluminium Atrazine wastewater, the degradation rate of atrazine reached about 88% in 60min, such as image 3 As shown in the middle curve (c), the utilization rate of the shown persulfate is 52.5%, as shown in Figure 4 Histogram (c) is shown.

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Abstract

The invention discloses a preparation method and application of a bimetallic oxide loaded activated carbon fiber composite electrode, which relate to the technical field of electrode material preparation. The advantages that the activated carbon fiber is large in specific surface area, capable of activating persulfate and high in conductivity are utilized, the activated carbon fiber is used as a carrier, the film forming effect of a PTFE solution is used, CuFe2O4 with high catalytic activity is loaded to the interior and the surface of the activated carbon fiber in a water bath oscillation mode, and a novel CuFe2O4@ACF composite electrode is prepared. The electrode prepared by the method has high persulfate activation efficiency, and can well degrade organic pollutant wastewater under a neutral condition.

Description

technical field [0001] The invention relates to the technical field of electrode material preparation, in particular to the preparation of a novel activated carbon fiber composite electrode loaded with bimetallic oxides and the application of the electrode in a sulfate radical advanced oxidation system. Background technique [0002] Sulfate radical advanced oxidation processes (SR-AOP) is a new and efficient oxidation process of organic pollutants, which has the advantages of environmental protection, no pollution and obvious treatment effect. Among them, how to activate persulfate to obtain sulfate radical (SO 4 - ·) The most important, electrochemical activation has received extensive attention because of its fast reaction speed, high utilization rate of persulfate, and high mineralization rate. Oxidative sulfate radicals, the key to realize the catalytic degradation of high-efficiency sulfate radical advanced oxidation technology is to improve the utilization rate of pe...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J35/10C02F1/72C02F101/38
CPCB01J23/745C02F1/72C02F2101/38B01J35/33B01J35/61
Inventor 孙治荣倪鑫
Owner BEIJING UNIV OF TECH
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