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Preparation method and application of polymanganese silicate doped hydroxy manganese oxide catalyst

A technology of manganese oxyhydroxide and catalyst, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problems such as difficult recycling, achieve removal rate improvement, Easy to recycle, good catalytic effect

Active Publication Date: 2014-07-23
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a preparation method and application of a polymanganese silicon salt doped manganese oxyhydroxide catalyst with good sedimentation performance for the difficult problem of recycling pollutants in water after manganese oxyhydroxide catalyzed ozone oxidation degradation

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  • Preparation method and application of polymanganese silicate doped hydroxy manganese oxide catalyst
  • Preparation method and application of polymanganese silicate doped hydroxy manganese oxide catalyst
  • Preparation method and application of polymanganese silicate doped hydroxy manganese oxide catalyst

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Embodiment 1

[0022] The preparation method of the polymanganese silicon salt doped manganese oxyhydroxide catalyst of the present embodiment is characterized in that comprising the following steps:

[0023] (1) Add the hydrochloric acid solution with a concentration of 0.01 mol / L dropwise into the soluble manganese nitrate solution with a concentration of 0.1 mol / L, and adjust the pH of the manganese salt solution to 2;

[0024] (2) Continuously and slowly stir the manganese salt solution obtained in step (1) at a stirring speed of 100 r / min, and slowly add an aqueous alkali metal sodium silicate solution with a concentration of 0.3 mol / L dropwise until the pH of the mixed solution is 7;

[0025] (3) Add a certain concentration of sodium hydroxide solution dropwise to the mixed solution obtained in step (2), and adjust the pH of the mixed solution to >12;

[0026] (4) Let the mixture obtained in step (3) settle for 10 minutes, and then place it in an environment at 70°C for 24 hours;

[0...

Embodiment 2

[0031] The preparation method of the polymanganese silicon salt doped manganese oxyhydroxide catalyst of the present embodiment is characterized in that comprising the following steps:

[0032] (1) Add the hydrochloric acid solution with a concentration of 0.01 mol / L dropwise into the soluble manganese chloride solution with a concentration of 0.5 mol / L, and adjust the pH of the manganese salt solution to 3;

[0033] (2) Continuously and slowly stir the manganese salt solution obtained in step (1) at a stirring speed of 300r / min, and slowly add a sodium metasilicate solution with a concentration of 0.8mol / L dropwise until the pH of the mixed solution is 7;

[0034] (3) Add a certain concentration of sodium hydroxide solution dropwise to the mixed solution obtained in step (2), and adjust the pH of the mixed solution to be 13;

[0035] (4) Let the mixture obtained in step (3) settle for 30 minutes, and then activate it at 90°C for 12 minutes;

[0036] (5) Filter the activated ...

Embodiment 3

[0040] The preparation method of the polymanganese silicon salt doped manganese oxyhydroxide catalyst of the present embodiment is characterized in that comprising the following steps:

[0041](1) Add the hydrochloric acid solution with a concentration of 0.01 mol / L dropwise into the soluble manganese sulfate solution with a concentration of 0.3 mol / L, and adjust the pH of the manganese salt solution to 2.5;

[0042] (2) Continuously and slowly stir the manganese salt solution obtained in step (1) at a stirring speed of 200 r / min, and slowly add an aqueous alkali metal potassium silicate solution with a concentration of 0.5 mol / L dropwise until the pH of the mixed solution is 7;

[0043] (3) Add a certain concentration of sodium hydroxide solution dropwise to the mixed solution obtained in step (2), and adjust the pH of the mixed solution to be 12.5;

[0044] (4) The mixture obtained in step (3) was allowed to settle for 20 minutes, and then placed in an environment of 80°C fo...

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Abstract

The invention discloses a preparation method for a polymanganese silicate doped hydroxy manganese oxide catalyst. The method includes: adding a hydrochloric acid solution into a soluble manganese salt solution dropwise, adjusting the pH of the manganese salt solution to 2-3; slowly stirring the manganese salt solution continuously at a speed of 100r / min-300r / min, and slowly adding a alkali metal silicate water solution with a concentration of 0.3-0.8mol / L dropwise until the pH of the mixed solution reaches 7; adding a sodium hydroxide solution into the mixed solution dropwise, adjusting the pH of the mixed solution to greater than 12; subjecting the mixed solution to static precipitation for 10-30min, and then placing the mixed solution in an 70DEG C-90DEG C environment to undergo activation; filtering the activated precipitate, and washing the precipitate with ultrapure water repeatedly; and putting the obtained precipitate in a drying oven to undergo drying. The catalyst prepared by the invention has large specific surface area and large surface hydroxy density, can be used in a water treatment process, and has the advantages of high stability in itself, easy recycling, no secondary pollution and the like.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation and application, and in particular relates to a preparation method of a polymanganese silicon salt-doped manganese oxyhydroxide catalyst and its application in water treatment. Background technique [0002] As a strong oxidant, the application of ozone in wastewater treatment has attracted increasing attention, but the solubility of ozone in water is low and unstable, resulting in low utilization of ozone and it is difficult for ozone alone to completely degrade organic matter into CO. 2 and H 2 O thus hinders the widespread application of ozonation. Catalytic ozonation is an advanced oxidation technology developed in recent years to improve the efficiency of ozone utilization. It uses a large number of strong oxidizing hydroxyl radicals generated during the reaction process to oxidize and decompose organic matter in water to achieve the purpose of water purification. [0003] It h...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J35/10C02F1/78
Inventor 刘玥杨磊段学军
Owner ZHONGYUAN ENGINEERING COLLEGE
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