Catalyst for ozone heterogeneous catalysis oxidation of COD-related organics in wastewater and preparation method of catalyst

A technology of heterogeneous catalysis and oxidation of wastewater, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of easy loss, easily broken, deactivated activated carbon, etc., to achieve not easy loss, long service life , the effect of improving efficiency

Inactive Publication Date: 2018-06-08
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] CN201710218613 reports a rare earth-loaded catalyst for sewage treatment and its preparation method and application. The carrier is activated carbon and modified activated carbon. The loaded active components are lanthanum oxide and gadolinium oxide. The COD removal rate reaches 85%, but the activated carbon is easily broken. Easy to be lost and deactivated in actual working conditions

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  • Catalyst for ozone heterogeneous catalysis oxidation of COD-related organics in wastewater and preparation method of catalyst
  • Catalyst for ozone heterogeneous catalysis oxidation of COD-related organics in wastewater and preparation method of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Prepare MCM-41 spherical molecular sieve carrier, the preparation method is as follows:

[0038] MCM-41 molecular sieve and binder alumina were mixed at a mass ratio of 1:16 and turned into balls, then shaped and polished for 0.5 h, dried at 70 °C for 2 h, and calcined at 400 °C for 3 h , screened to obtain the MCM-41 spherical molecular sieve carrier with a particle size of 5-10 mm.

[0039] The MCM-41 spherical molecular sieve carrier was applied to the wastewater treatment process to remove COD from wastewater. The COD concentration at the inlet of the wastewater was 100 mg / L, and it stayed in the catalyst layer for 1 hour. The COD concentration at the outlet was 58 mg / l, and the COD removal rate was 42%.

Embodiment 2

[0057] A catalyst for ozone heterogeneously catalyzed oxidation of COD in waste water, with Al and Fe as active components, the Al load is 15%, and the Fe load is 10%. The preparation method comprises the following steps:

[0058] Preparation of Fe by impregnation method 2 o 3 -Al 2 o 3 @MCM-41 ozone catalyst:

[0059] (1) Aluminum nitrate was dissolved in deionized water to make a solution with a mass concentration of 10%. The dry MCM-41 spherical molecular sieve carrier prepared in Example 1 was added to the solution and stirred for 40 min. Aluminum nitrate and MCM-41 The mass ratio of the spherical molecular sieve carrier is 1:2, and then the solution is dried, first at room temperature, then at 50°C for more than 24 hours, and finally at 110°C for more than 24 hours, so that aluminum nitrate can be loaded on the molecular sieve MCM-41 superior;

[0060] (2) The samples obtained above were roasted at 450°C for 3 hours to obtain Al 2 o 3 @MCM-41;

[0061] (3) Dissolv...

Embodiment 3

[0064] A catalyst for ozone heterogeneously catalyzed oxidation of COD in wastewater, with Al and Fe as active components, an Al load of 15%, and an Fe load of 12%. The preparation method comprises the following steps:

[0065] 1) Preparation of Fe by impregnation method 2 o 3 -Al 2 o 3 @MCM-41 ozone catalyst:

[0066] (1) Aluminum nitrate was dissolved in deionized water to make a solution with a mass concentration of 10%. The dry MCM-41 spherical molecular sieve carrier prepared in Example 1 was added to the solution and stirred for 40 min. Aluminum nitrate and MCM-41 The mass ratio of the spherical molecular sieve carrier is 1:2, and then the solution is dried, first at room temperature, then at 50°C for more than 24 hours, and finally at 110°C for more than 24 hours, so that aluminum nitrate can be loaded on the molecular sieve MCM-41 superior;

[0067] (2) The samples obtained above were roasted at 450°C for 3 hours to obtain Al 2 o 3 @MCM-41;

[0068] (3) Dissolv...

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Abstract

The invention relates to a catalyst for ozone heterogeneous catalysis oxidation of COD-related organics in wastewater and a preparation method of the catalyst. An MCM-41 microsphere molecular sieve isused as a carrier, one of Al, Fe, Mn and Ce is used as an active component, and a precursor of the active component of the catalyst is a nitrate, an acetate or a chloride. The method provided by theinvention adopts an impregnation method to prepare the multi-metal oxide supported catalyst; the solid catalyst can decompose ozone into hydroxyl radicals with stronger oxidizing properties, then thehydroxyl radicals and organic substances in the wastewater are subjected to an oxidation reaction, the organic substances are converted into carbon dioxide and water, and therefore the purpose of reducing the COD in the wastewater is achieved; and the catalyst provided by the invention has high catalytic activity, long service life and easy realization of large-scale production, and effectively improves the efficiency of removing the COD-related organics in the wastewater by ozone.

Description

technical field [0001] The invention belongs to the field of advanced oxidation treatment of wastewater, and relates to a catalyst and a preparation method for ozone heterogeneously catalyzed oxidation of COD in wastewater, in particular to a multi-element metal salt loaded catalyst and its preparation by an impregnation method. Background technique [0002] Wastewater includes domestic sewage, industrial wastewater and other useless water. Chemical oxygen demand (COD) is a chemical method to measure the amount of reducing substances that need to be oxidized in water samples. It is a pollution indicator strictly controlled by the state and requires strict treatment before it can be discharged. Wastewater oxidation treatment technology is one of the chemical treatment methods for wastewater. Its working principle is to use strong oxidants to oxidize the refractory organic matter in the wastewater, so that the organic matter in the wastewater can be degraded into simple inorga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01J35/08C02F1/78C02F1/72
CPCB01J29/76B01J35/08B01J2229/18C02F1/725C02F1/78C02F2209/08
Inventor 张昭良蔡连国李倩辛颖张永凯郑德超
Owner UNIV OF JINAN
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