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Preparation method and application of manganese oxide octahedral molecular sieve catalyst

An octahedral molecular sieve and catalyst technology, applied in molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of harsh technical conditions for photoactivated persulfate and high energy consumption of thermally activated persulfate technology, Achieve good catalytic degradation effect, excellent catalytic effect, good application prospect

Pending Publication Date: 2021-01-26
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sulfate radicals can be generated by decomposing persulfate or hydrogen persulfate through high temperature pyrolysis, photocatalysis, transition metal catalysis, etc. However, the technology of thermal activation of persulfate consumes a lot of energy, and the technical conditions of photoactivation of persulfate are harsh

Method used

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  • Preparation method and application of manganese oxide octahedral molecular sieve catalyst
  • Preparation method and application of manganese oxide octahedral molecular sieve catalyst
  • Preparation method and application of manganese oxide octahedral molecular sieve catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] First MnCO 3 (100g, 0.87mol) and potassium oxalate (10g, 0.054mol) were ground evenly in an agate mortar. Then the mixture was calcined in a muffle furnace at 400°C, 450°C, and 500°C for 2h to obtain solid samples (containing MnOx intermediates). The solid sample was then dispersed in a solution of concentrated nitric acid (30 mL) (16 mol / L) and potassium nitrate (10 g, 0.1 mol), and stirred and refluxed at 100° C. for 2 h. Finally, after filtering, washing with water three times, and drying at 80°C for 5 hours, the catalyst OMS-2-CA-x was obtained, where x represents the calcination temperature, including 400°C, 450°C, and 500°C.

[0041] Take manganese oxide octahedral molecular sieve (OMS-2) as a comparative case. The specific preparation method is to add potassium permanganate (5.89g) into a 250ml round bottom flask, then add 100ml of water, stir at room temperature for 10min, then continue to add 3ml of concentrated nitric acid (16mol / L) and 8.8g of manganese sul...

Embodiment 2

[0043] Using the OMS-2-CA-x prepared in Example 1 to catalyze PMS at different calcination temperatures to generate active oxygen species to degrade the application comparison chart on Rhodamine B, thereby selecting OMS-2-CA-450 as the optimal catalyst for degradation experiments .

[0044] The steps of the OMS-2-CA-x in catalyzing PMS to generate active oxygen species to degrade Rhodamine B are as follows:

[0045] Step 1: Add Rhodamine B solution (50mL, 20mg / L) into a 100mL round bottom flask, add OMS-2-CA-x (0.1g / L) and stir for 10min;

[0046] Step 2: Test and record the peak absorption of Rhodamine B at this time;

[0047] Step 3: Quickly add PMS (0.25g / L) to the round bottom flask, take out 3mL and add it to the cuvette at a certain interval, measure the peak shape of the Rhodamine B UV-Vis absorption spectrum with a UV-Vis photometer .

[0048] The quality of the OMS-2-CA-x catalyst described in step 3 is 12.5 mg.

[0049] figure 1 For the SEM, XRD and XPS figures ...

Embodiment 3

[0052] Using the OMS-2-CA-x prepared in Example 1 at the optimal calcination temperature, the catalyst takes different amounts to catalyze PMS to generate active oxygen species to degrade the application comparison chart on Rhodamine B, thereby selecting OMS-2-CA The amount of -450 was 0.25g / L as the optimum catalyst amount for the experiment of degrading other dyes.

[0053] The steps of the OMS-2-CA-450 in catalyzing PMS to generate active oxygen species to degrade Rhodamine B are as follows:

[0054] Step 1: Add Rhodamine B solution (50mL, 20mg / L) into a 100mL round bottom flask, add OMS-2-CA-450 (0.062g / L-0.5g / L) and stir for 10min;

[0055] Step 2: Test and record the peak absorption of Rhodamine B at this time;

[0056] Step 3: Quickly add PMS (0.25g / L) to the round bottom flask, take out 3mL and add it to the cuvette at a certain interval, measure the peak shape of the Rhodamine B UV-Vis absorption spectrum with a UV-Vis photometer .

[0057] The quality of the OMS-2...

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Abstract

The invention discloses a preparation method of a manganese oxide octahedral molecular sieve and application of the manganese oxide octahedral molecular sieve in degradation of organic pollutants. Thecatalyst is prepared by calcining, refluxing, filtering, washing and drying a mixed solution of manganese carbonate, potassium oxalate, concentrated nitric acid and potassium nitrate. The catalyst isused for catalyzing and activating peroxydisulfate to generate sulfate free radicals, hydroxyl free radicals, superoxide free radicals and non-free radical singlet oxygen with strong oxidizing property, so that organic dyes and antibiotics are efficiently oxidized and degraded, and the catalyst can be recycled after reaction. The obtained catalyst can efficiently catalyze and activate hydrogen persulfate for multiple times at room temperature to generate sulfate free radicals, hydroxyl free radicals, superoxide free radicals and non-free-radical singlet oxygen to degrade organic pollutants, can be recycled and repeatedly used after reaction, has no obvious reduction in catalytic performance, can greatly reduce the industrial cost, accords with a green production principle and has a greatprospect in the field of organic wastewater degradation.

Description

technical field [0001] The invention relates to the preparation of a manganese oxide octahedral molecular sieve catalyst and its application in degrading organic pollutants, belonging to the technical field of organic wastewater treatment. Background technique [0002] Manganese oxides are a class of potential heterogeneous catalysts, including MnO, Mn 2 o 3 , MnO 2 and Mn 3 o 4 etc., have been applied in a variety of oxidation–reduction reactions, and manganese oxides are generally considered as an abundant transition metal with low toxicity and low cost. Recent research results have shown that manganese oxides can be used to activate persulfate and hydrogen persulfate to generate strong oxidizing sulfate radicals to oxidize and degrade pollutants in industrial wastewater. However, the preparation process of the existing manganese catalyst is relatively complicated, the catalytic activity is not ideal, the amount of oxidant used is large, and the cost of wastewater tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/00C02F1/72C02F101/30
CPCB01J29/00C02F1/722C02F2101/30
Inventor 刘湘侯文欣黄煜
Owner CHINA THREE GORGES UNIV
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