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Preparation of three-dimensional prismatic manganese oxide molecular sieve catalytic material and application of three-dimensional prismatic manganese oxide molecular sieve catalytic material in degradation of organic pollutants

A technology for organic pollutants and catalytic materials, which is applied in the field of preparation of three-dimensional prismatic manganese oxide molecular sieve catalytic materials, can solve the problems of restricting diffusion and mass transfer of organic molecules, unfavorable reaction kinetics, restricting catalytic activity, etc., and achieves high yield , large specific surface area, simple operation effect

Active Publication Date: 2022-06-24
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the manganese oxide molecular sieves prepared by these methods only have the morphology of nanorods and nanoparticles. When they are used as catalytic materials in the chemical conversion process, the adsorption, activation, and decomposition of the surface of the manganese oxide molecular sieve material are limited to a certain extent. The type of active sites also limits the diffusion and mass transfer of organic molecules on the surface of the material, which is not conducive to the improvement of reaction kinetics, which in turn limits the catalytic activity of manganese oxide molecular sieve materials in the field of heterogeneous catalytic oxidation

Method used

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  • Preparation of three-dimensional prismatic manganese oxide molecular sieve catalytic material and application of three-dimensional prismatic manganese oxide molecular sieve catalytic material in degradation of organic pollutants
  • Preparation of three-dimensional prismatic manganese oxide molecular sieve catalytic material and application of three-dimensional prismatic manganese oxide molecular sieve catalytic material in degradation of organic pollutants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of manganese oxide molecular sieve catalytic material: At room temperature, 26 mmol of manganese sulfate, 0.088 mmol of phosphomolybdic acid and 1.5 mL of nitric acid (concentration 0.15 g / mL) were dissolved in 15 mL of distilled water. 50 mL of distilled aqueous solution was added dropwise to the above mixed solution, and after stirring and mixing evenly, the reaction was stirred at 100 ° C for 24 hours, filtered, washed with distilled water, and dried at 50 ° C for 10 hours to obtain a manganese oxide molecular sieve catalytic material. The SEM, SEM and XRD spectra of the manganese oxide molecular sieve catalytic material are as follows figure 1 , 2 shown;

[0026] (2) Application of degrading organic pollutants in water: adding manganese oxide molecular sieve catalytic material (the concentration of catalytic material in wastewater is 200 mg / L) to 20 mg / L acid scarlet G dye wastewater; stirring reaction at room temperature under air atmosphere After...

Embodiment 2

[0030] (1) Preparation of manganese oxide molecular sieve catalytic material: At room temperature, dissolve 52 mmol manganese acetate, 0.35 mmol ammonium phosphomolybdate and 3 mL nitric acid (concentration 0.15 g / mL) in 30 mL distilled water, and dissolve 100 mL containing 37 mmol potassium permanganate into 30 mL distilled water. The distilled aqueous solution was added dropwise to the above mixed solution, and after stirring and mixing evenly, the reaction was stirred at 50° C. for 24 hours, filtered, washed with distilled water, and dried at 150° C. for 24 hours to obtain a manganese oxide molecular sieve catalytic material. The structure of the manganese oxide molecular sieve catalytic material is similar to that of Example 1;

[0031] (2) Application of degrading organic pollutants in water: Add manganese oxide molecular sieve catalytic material (the concentration of this catalytic material in the wastewater is 50 mg / L) into 200 mg / L acid orange 7 dye wastewater, and unde...

Embodiment 3

[0035] (1) Preparation of manganese oxide molecular sieve catalytic material: At room temperature, dissolve 0.037mol manganese sulfate, 0.0185mol phosphomolybdic acid and 30mL nitric acid (concentration 0.15g / mL) in 300mL distilled water, and dissolve 0.37mol potassium permanganate 1L of distilled water solution was added dropwise to the above mixed solution, after stirring and mixing evenly, the reaction was stirred at 80°C for 20 hours, filtered, washed with distilled water, and dried at 50°C for 15 hours to obtain a manganese oxide molecular sieve catalytic material. The structure of the manganese oxide molecular sieve catalytic material is similar to that of Example 1;

[0036] (2) Application of degrading organic pollutants in water: add potassium peroxymonosulfate (the concentration of potassium hydrogen persulfate is 500mg / L) to 50mg / L of mezatrione dye wastewater, and then add manganese oxide molecular sieve to the wastewater to catalyze material (the concentration of ...

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Abstract

The invention discloses a preparation method of a three-dimensional prismatic manganese oxide molecular sieve catalytic material, which comprises the following steps: uniformly mixing a potassium permanganate aqueous solution with an aqueous solution containing a divalent manganese salt, nitric acid and a doping reagent, and stirring and reacting at 25-100 DEG C for 5-24 hours; and filtering, washing and drying the reaction product to obtain the three-dimensional prismatic manganese oxide molecular sieve catalytic material. The manganese oxide molecular sieve catalytic material is a cryptomelane crystal phase, has a three-dimensional prism-shaped morphological structure and a large specific surface area, and can effectively catalyze, oxidize and degrade various organic pollutants in water in cooperation with oxidizing agents such as air, oxygen, hydrogen peroxide and persulfate. In addition, the manganese oxide molecular sieve material with the lamellar structure is prepared through one-pot reflux, the operation method is simple, the yield is high, and the repeatability is good.

Description

technical field [0001] The invention relates to a preparation method of a three-dimensional prismatic manganese oxide molecular sieve catalytic material, which is mainly used for degrading organic pollutants in water, and belongs to the technical field of nanomaterials and water treatment. Background technique [0002] Manganese oxide molecular sieve belongs to a -MnO 2 A one-dimensional channel structure composed of manganese-oxygen octahedral structural units connected by 2x2 corners, with a pore size of about 0.46 nm, in which there are K in the channel. + Helps support the strength of the pore skeleton and balance the surface charge of the overall material. Manganese oxide molecular sieves have porous structure, manganese ions of various valences, mild surface acidity and alkalinity, good ion exchange performance and oxidation performance. In recent years, they have been widely used as catalytic materials, adsorption materials and semiconductor materials. [0003] Man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03C02F1/72C02F101/34C02F101/36C02F101/38
CPCB01J29/03C02F1/725C02F2101/308C02F2101/34C02F2101/36C02F2101/38C02F2101/345C02F2101/40B01J35/615Y02W10/37
Inventor 孟旭王晓培赵培庆
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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