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Cr ion doped Mn3O4 thermocatalytic material, and preparation method and application thereof

An ion doping and thermal catalysis technology is applied in the field of Cr ion doped Mn3O4 thermocatalytic material and its preparation, which can solve the problems of low photocatalytic utilization rate and small light response range, and achieves improved thermal catalytic activity and cheap and easy raw materials. easy to transfer

Active Publication Date: 2020-06-02
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of photocatalytic materials on their own bandwidth, the larger the bandwidth, the smaller the photoresponse range and the lower the photocatalytic utilization

Method used

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  • Cr ion doped Mn3O4 thermocatalytic material, and preparation method and application thereof
  • Cr ion doped Mn3O4 thermocatalytic material, and preparation method and application thereof
  • Cr ion doped Mn3O4 thermocatalytic material, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0031] (1) Cr ion-doped Mn 3 o 4 Thermocatalytic material Cr-Mn 3 o 4

[0032] The preparation method is as follows:

[0033] 1) Add 2.86g of 50% manganese nitrate into a beaker filled with 10ml of deionized water, and stir for 15min to fully dissolve it;

[0034] 2) Add 0.64g of sodium hydroxide into a beaker of 10ml of deionized water, stir for 15min to fully dissolve;

[0035] 3) Add 1.28g chromium nitrate nonahydrate (the molar weight of Cr is 10% of the molar weight of Mn) into the manganese salt solution obtained in step 1), and mix it uniformly by ultrasonic;

[0036] 4) Drop the mixed solution obtained in step 3) into the sodium hydroxide solution, and sonicate for 30 minutes until the solution is evenly mixed;

[0037] 5) Place the solution obtained in step 4) in a centrifuge, and obtain a precipitate after centrifugation.

[0038] 6) Place the mixed solution obtained in step 5) in an oven, dry at 60°C, and cool naturally to obtain the precursor;

[0039] 7) G...

Embodiment 2

[0044] Example 2 Application

[0045] (1) Effects of different catalytic materials on the catalytic degradation rate of isopropanol at different temperatures

[0046] The test process is: get the pure Mn prepared by 0.1g example 1 respectively 3 o 4 and 10% Cr doping amount prepared Cr-Mn 3 o 4 Thermal catalysis was respectively loaded into a quartz flow reactor, and then the reactor was placed in a constant temperature box, and then connected with flowing isopropanol, and the flow rate was adjusted to 1.37ml / s. The thermocatalytic degradation of isopropanol was carried out at different temperatures under dark conditions, and the peak areas of degraded isopropanol and initial isopropanol were recorded. Get the amount of degraded isopropanol through calculation, and the amount of initial isopropanol, such as image 3 Shown, the Cr ion-doped Cr-Mn of the present invention 3 o 4 The thermocatalytic degradation rate of the composite thermocatalytic material is higher than t...

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Abstract

The invention discloses a Cr ion doped Mn3O4 thermocatalytic material, and a preparation method and an application thereof. A chromium salt or chromium alkali is added into an aqueous solution of a manganese salt, the mixed solution is added into an alkali solution, ultrasonic treatment, centrifugation, drying and cooling are carried out to obtain a precursor, and the precursor is ground and thensubjected to high-temperature calcination treatment to obtain Cr-Mn3O4. The Cr ion doped Mn3O4 thermocatalytic material prepared by the method has the following advantages: the defect that Mn3O4 is low in thermal response to low temperature under the dark condition is overcome, movement of lattice oxygen in lattices is improved, the initial temperature required by reaction is reduced, the thermaldegradation rate is increased, and then the thermal catalytic activity can be effectively improved. The method is low in cost, simple and easy to operate. Organic pollutants can be degraded by heatingthe thermocatalytic material under dark conditions.

Description

technical field [0001] The invention relates to a preparation method of a doping material, and the application of thermal catalytic performance under dark conditions in the technical field of degrading volatile organic pollutants, in particular to Cr ion-doped Mn 3 o 4 Thermocatalytic materials and their preparation methods and applications. Background technique [0002] With the development of human society, the combustion of fossil fuels has caused a series of serious environmental problems, and the acquisition and conversion of solar energy into usable energy has become a key issue for human society. In recent years, photocatalytic degradation of organic pollutants has attracted more and more attention due to its advantages of no pollution and mild reaction conditions. However, due to the influence of photocatalytic materials on their own bandwidth, the larger the bandwidth, the smaller the photoresponse range and the lower the photocatalytic utilization. On this basis...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01D53/86B01D53/72
CPCB01J23/34B01D53/8668
Inventor 范晓星杨媛成祥祥
Owner LIAONING UNIVERSITY
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