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Cerium-doped manganese oxide electrode, preparation method and application thereof

A manganese oxide, cerium doping technology, applied in chemical instruments and methods, water/sewage treatment equipment, electrochemical water/sewage treatment, etc. Nitrogen, easy-to-control effects

Active Publication Date: 2018-06-08
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN106630116A, CN106563504A, CN103613206B, CN102942293A, CN102351312A have all reported the method of cathodic electrochemical reduction of nitrate radical denitrification, but this method is not denitrification by oxidation of ammonia nitrogen
CN103241809A uses neodymium-doped tin oxide graphite electrodes to achieve ammonia nitrogen degradation under high overpotential conditions, but high potential means limited electrocatalytic activity

Method used

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  • Cerium-doped manganese oxide electrode, preparation method and application thereof
  • Cerium-doped manganese oxide electrode, preparation method and application thereof
  • Cerium-doped manganese oxide electrode, preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0043] (1) Treat the titanium mesh (purity>99.9%, size: length×width×thickness: 30mm×30mm×1mm, rhombus hole size: 2mm×4mm) with NaOH and oxalic acid in turn, deionized water ultrasonic 1-2min, nitrogen Blow dry and store in absolute ethanol for later use;

[0044] (2) Prepare impregnating solution: take by weighing the manganese nitrate solution that mass fraction is 50%, weigh Ce(NO 3 ) 3 ·6H 2 O, use dehydrated alcohol as solvent, stirring and mixing;

[0045] (3) Immerse the titanium mesh treated in (1) in the impregnating solution of (2) for a certain period of time, dry it at room temperature, transfer it to an oven and bake it at 105°C for 1-2h, until there is no obvious liquid on the surface of the titanium mesh;

[0046](4) After repeating step (3) twice, the electrode was transferred to a muffle furnace and kept at 350°C for 2 hours. After cooling to room temperature, the electrode was taken out to obtain the prepared cerium-doped manganese oxide electrode. cataly...

Embodiment 2

[0049] (1) Treat the titanium mesh (purity>99.9%, size: length×width×thickness: 30mm×30mm×1mm, rhombus hole size: 2mm×4mm) with NaOH and oxalic acid in turn, deionized water ultrasonic 1-2min, nitrogen Blow dry and store in absolute ethanol for later use;

[0050] (2) Prepare impregnating solution: take by weighing the manganese nitrate solution that mass fraction is 50%, weigh Ce(NO 3 ) 3 ·6H 2 O, use dehydrated alcohol as solvent, stirring and mixing;

[0051] (3) Immerse the titanium mesh treated in (1) in the impregnating solution of (2) for a certain period of time, dry it at room temperature, transfer it to an oven and bake it at 80°C for 1-2h, until there is no obvious liquid on the surface of the titanium mesh;

[0052] (4) After repeating step (3) twice, the electrode was transferred to a muffle furnace, and kept at 450°C for 2 hours. After cooling to room temperature, the electrode was taken out to obtain the prepared cerium-doped manganese oxide electrode. catal...

Embodiment 3

[0055] (1) Treat the titanium mesh (purity>99.9%, length, width, thickness 30mm·30mm·1mm, rhombus hole size 2mm·4mm) with NaOH and oxalic acid in turn, deionized water ultrasonic 1-2min, nitrogen Blow dry and store in absolute ethanol for later use;

[0056] (2) Prepare impregnating solution: take by weighing the manganese nitrate solution that mass fraction is 50%, weigh Ce(NO 3 ) 3 ·6H 2 O, use dehydrated alcohol as solvent, stirring and mixing;

[0057] (3) Immerse the titanium mesh treated in (1) in the impregnating solution of (2) for a certain period of time, dry it at room temperature, transfer it to an oven and bake it at 105°C for 1-2h, until there is no obvious liquid on the surface of the titanium mesh;

[0058] (4) After repeating step (3) twice, the electrode was transferred to a muffle furnace and kept at 550°C for 2 hours. After cooling to room temperature, the electrode was taken out to obtain the prepared cerium-doped manganese oxide electrode. catalytic e...

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Abstract

The invention discloses a cerium-doped manganese oxide electrode, a preparation method and the application thereof. The preparation method comprises the following steps: soaking a pretreated titaniummesh into an impregnation liquid containing Ce3+ and Mn2+ for impregnation, then taking out the titanium mesh and carrying out drying treatment until the surface of the titanium mesh is free of obvious liquids, and then carrying out heat treatment on the titanium mesh so as to obtain the cerium-doped manganese oxide electrode. Electrocatalytic denitrification is carried out by using the cerium-doped manganese oxide electrode provided by the invention as a positive electrode material, ammonia nitrogen can be oxidized into nitrogen directly under the driving of direct current, thorough denitrification is realized, the whole process is mild in condition, no secondary pollution is generated, the degradation efficiency is high, and the method is low in operation cost and easy to control.

Description

technical field [0001] The invention relates to an electrode material, in particular to a cerium-doped manganese oxide electrode, its preparation method and application, for example, a method for using the same to electrocatalyze denitrification. Background technique [0002] Excessive ammonia nitrogen in water will reduce the concentration of dissolved oxygen, produce nitrate and nitrite, lead to eutrophication, and in severe cases, algal blooms will explode, which will have adverse effects on aquatic organisms, industrial production and people's lives. According to the petrochemical industry sewage discharge standard (GB31571-2015), the content of ammonia nitrogen (NH3-N) should not exceed 8mg / L. [0003] At present, the methods of denitrification include biological method and physical chemical method. Physical and chemical methods mainly include breakpoint chlorination method, chemical precipitation method, physical stripping method, air stripping method, etc. These meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/46
CPCC02F1/46C02F1/46109C02F2001/46142C02F2101/16C02F2201/46105
Inventor 刘守清张行马楫朱国营沈培新
Owner SUZHOU UNIV OF SCI & TECH