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Composite cathode and preparation method thereof as well as application of composite cathode in biological electro-Fenton method

A composite cathode and mixed salt technology, which is applied in chemical instruments and methods, special compound water treatment, biological water/sewage treatment, etc., can solve the problems of rare catalysts, achieve excellent catalyst performance, wide pH adaptability, and process simple effect

Inactive Publication Date: 2019-01-08
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the current research has only developed the doping of a single transition metal, and there are few reports on the preparation of catalysts doped with two transition metals.

Method used

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  • Composite cathode and preparation method thereof as well as application of composite cathode in biological electro-Fenton method
  • Composite cathode and preparation method thereof as well as application of composite cathode in biological electro-Fenton method
  • Composite cathode and preparation method thereof as well as application of composite cathode in biological electro-Fenton method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Soak the carbon felt in concentrated nitric acid solution, oxidize at a constant temperature of 100°C for 2 hours, then rinse with water until the pH of the cleaning solution is neutral, and dry to constant weight.

[0035] Then dissolve 0.75 mmoL ferric chloride hexahydrate, 0.25 mmoL manganese sulfate monohydrate and 0.25 mmoL hexahydrate and cobalt chloride in 100 ml distilled water, stir to dissolve. The clean carbon felt modified by surface oxidation was immersed in the mixed salt solution of iron, manganese and cobalt, and ultrasonicated for 1 h.

[0036] 2) Slowly add 15mg / mL sodium borohydride aqueous solution dropwise at a rate of 0.5mL / s. While adding the reducing agent, shake the solution at a speed of 300rpm / min.

[0037] 3) The electrodes were left to stand, rinsed with water, and then dried in a vacuum oven at 50°C for 12 hours.

[0038] figure 1 For the SEM figure of the composite electrode that this embodiment 1 makes, by figure 1 It can be seen th...

Embodiment 2

[0040] 1) Soak the carbon felt in a concentrated nitric acid solution, oxidize it at a constant temperature of 80°C for 3 hours, then wash it with water until the pH of the cleaning solution is neutral, and dry it to a constant weight.

[0041] Then, dissolve 5mmoL ferric chloride hexahydrate, 2.5mmoL manganese sulfate monohydrate and 2.5mmoL cobalt chloride hexahydrate in 100ml distilled water, and stir to dissolve. The clean carbon felt modified by surface oxidation was immersed in the mixed salt solution of iron, manganese and cobalt, and ultrasonicated for 1 h.

[0042] 2) Slowly add 10mg / mL potassium borohydride aqueous solution dropwise at a rate of 0.1mL / s. While adding the reducing agent, shake the solution at a speed of 200rpm / min.

[0043] 3) The electrodes were left to stand, rinsed with water, and then dried in a vacuum oven at 40°C for 10 hours.

Embodiment 3

[0045] 1) Soak the carbon felt in a concentrated nitric acid solution, oxidize it at a constant temperature of 90°C for 1 hour, then wash it with water until the pH of the cleaning solution is neutral, and dry it to a constant weight.

[0046] Then 2.5mmol of ferric chloride hexahydrate, 2.5mmol of manganese chloride tetrahydrate and 2.5mmol of cobalt chloride hexahydrate were dissolved in 100mL of distilled water, and stirred to dissolve. The clean carbon felt modified by surface oxidation was immersed in the mixed salt solution of iron, manganese and cobalt, and ultrasonicated for 1 h.

[0047] 2) Slowly add 20 mg / mL hydrazine hydrate aqueous solution dropwise at a rate of 1 mL / s, and shake the solution at a speed of 250 rpm / min while adding the reducing agent.

[0048] 3) The electrodes were left to stand, rinsed with water, and then dried in a vacuum oven at 80°C for 5 hours.

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Abstract

The invention discloses a composite cathode and a preparation method thereof as well as application of the composite cathode in a biological electro-Fenton method, and belongs to the fields of preparation of environmental electrochemical materials and wastewater treatment by an advanced oxidation technology. The method comprises the following steps: soaking a clean carbon felt subjected to surfaceoxidation modification into a mixed salt solution of iron, manganese and cobalt; then adding a reducing agent and reducing the surface of the carbon felt to obtain nanoparticles, namely the compositecathode; the molar ratio of the iron to the manganese to the cobalt in the mixed salt solution is (1-4):1:1. The preparation method disclosed by the invention is simple; the obtained electrode has good recycling performance; the constructed bio-electric Fenton system has wide pH adaptation range and can significantly improve the degradation rate of syringic acid.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental electrochemical materials and wastewater treatment by advanced oxidation technology, and specifically relates to a microbial electro-Fenton composite cathode, a preparation method thereof and its application in degrading syringic acid by a bio-electric Fenton method. Background technique [0002] Lignocellulose is the most abundant biological resource on earth, so its efficient utilization will have a profound impact on the future energy structure. However, a large amount of phenolic substances are produced during the pretreatment of lignocellulose, and syringic acid is one of the refractory substances widely present. [0003] Bioelectric Fenton is a system that combines the power generation characteristics of biofuel cells and the strong oxidation performance of Fenton reagents, which can degrade many pollutants in water bodies. Iron-based catalysts are common Fenton catalys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00
CPCC02F3/005C02F2305/026
Inventor 雍晓雨李彪周俊贾红华吴夏芫谢欣欣仉丽娟
Owner NANJING UNIV OF TECH
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