CN-121988338-A - Cu-Mg-Mn three-phase catalyst and preparation method thereof

CN121988338ACN 121988338 ACN121988338 ACN 121988338ACN-121988338-A

Abstract

The invention discloses a Cu-Mg-Mn three-phase catalyst which is used for treating quinoline wastewater by ozone, and consists of a metal active component MgO, cuO, mnO 2 and a carrier metal oxide, wherein MgO, cuO, mnO 2 is loaded on the surface of the metal oxide through coprecipitation-annealing. The catalyst has not only increased acidic active sites compared to single metal catalysts, but also produces more redox reactions due to the synergy between the metals. By adhering the catalyst to the sponge, not only is the surface area of the catalyst increased, but it is also easy to recover. The catalyst has good catalytic effect and high stability, is a better ozone catalyst, and can obviously reduce the cost in the practical application of an ozone method.

Inventors

AN LICHAO
Hu Canhai
DAI XIN
GUO YAN

Assignees

南京理工大学

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (6)

1. A Cu-Mg-Mn three-phase catalyst, characterized in that it consists of a metal active component MgO, cuO, mnO 2 and a carrier metal oxide, said MgO, cuO, mnO 2 being supported on the surface of the metal oxide by co-precipitation-annealing.
2. The Cu-Mg-Mn three-phase catalyst of claim 1, wherein the metal oxide is alumina.
3. The Cu-Mg-Mn three-phase catalyst according to claim 1, wherein the Mn, cu and Mg elements in the Cu-Mg-Mn three-phase catalyst are 3%, 3% and 5.5% by mass of the metal oxide, respectively.
4. A sponge Cu-Mg-Mn three-phase catalyst, characterized in that it is obtained by uniformly adhering the Cu-Mg-Mn three-phase catalyst according to any one of claims 1 to 3 to a sponge.
5. A method for preparing a Cu-Mg-Mn three-phase catalyst according to any one of claims 1 to 3, comprising the steps of: Washing metal oxide in pure water for 3-4 times, flushing out powder on the surface, drying for 20-24 h at 105+/-2 ℃, and roasting for 2-3 h at 300-400 ℃; Soaking magnesium nitrate, manganese nitrate, copper nitrate and the metal oxide in pure water, heating to 60 ℃, adding Na 2 CO 3 , continuously stirring, heating to 100 ℃ and aging for 3 hours to obtain a precipitate; And thirdly, flushing the precipitate obtained in the second step by pure water, drying, and roasting for 3-4 hours at 500-600 ℃ under the protection of inert gas.
6. Use of a Cu-Mg-Mn three-phase catalyst according to any one of claims 1 to 3 or a sponge Cu-Mg-Mn three-phase catalyst according to claim 4 for the ozone treatment of quinoline waste water.

Description

Cu-Mg-Mn three-phase catalyst and preparation method thereof Technical Field The invention relates to the field of chemical wastewater treatment, in particular to a Cu-Mg-Mn three-phase catalyst for quinoline wastewater advanced treatment and a preparation method thereof. Background Quinoline and its derivatives are a typical class of refractory nitrogen-containing heterocyclic organic compounds that are ubiquitous in the environment, widely used in industrial and agricultural production and have been severely contaminated into soil and water. It has been demonstrated that quinoline and its derivatives are present in aquifer sediments, urban air, tobacco smoke, sea water and fish tissues, in addition to groundwater, and are also typical refractory organic pollutants produced during recovery of refined tar, coked products. Quinoline and its derivatives are toxic, mutagenic and carcinogenic to animals and humans, and are prone to accumulation in the biological chain and difficult to be effectively degraded. The current common quinoline wastewater treatment method mainly comprises a biological method, a physical method and a chemical method. Common biological processes include aerobic biological processes, anaerobic biological processes, and anoxic biological processes, in which biochemical reactions that are difficult to occur under aerobic conditions can occur due to anaerobic microorganisms. The anaerobic microorganism can crack the ring through ring hydrogenation reduction or hydroxylation by adding water into the ring, and the hydroxyl is introduced to open double bonds for cracking, so that a sound ring-opening enzyme system in the body is provided for the anaerobic acidification degradation of the heterocyclic compound. While the physical method mainly comprises an adsorption method. The common adsorbents in wastewater treatment include activated carbon, fly ash, bentonite, zeolite and the like, wherein the activated carbon and coke quenching powder are widely applied to the removal of nitrogenous heterocyclic compounds in wastewater in coal chemical industry. In recent years, clear people have focused on advanced oxidation technologies such as Fenton oxidation, catalytic wet oxidation, electrochemical oxidation, and the like. However, these techniques have a series of problems such as high input and running costs, low pH of Fenton oxidation reaction and the need for continuous additional materials, the generation of large amounts of iron-containing sludge, and the like. The ozone oxidation technology has the advantages of low running cost, small secondary pollution and the like, is widely applied to the advanced treatment of domestic sewage and industrial wastewater, and has good industrial application value. The ozone catalyst oxidation is the most studied technology for catalyzing the oxidation of ozone at present, and a large amount of hydroxyl free radicals are generated in the reaction process by adding the catalyst to catalyze the ozone, so that organic matters which are difficult to be oxidized or degraded by ozone singly can be oxidized at normal temperature and normal pressure to purify water, and the technology has the advantages of improving the oxidation utilization rate of the ozone, improving the oxidation capacity of the ozone and the like. Ozone catalytic oxidation can be classified into homogeneous ozone catalytic oxidation and heterogeneous ozone catalytic oxidation according to the reaction phase. The existing catalyst for homogeneous ozone catalytic oxidation is distributed in water in an ion form, cannot be separated from a reaction system, and is easy to cause loss and waste of the catalyst and secondary pollution of metal ions in the water body. The heterogeneous ozone catalytic oxidation technology has the advantages of strong oxidizing property, simple operation, easy recovery of catalyst, small occupied area and the like, and becomes one of the effective modes of advanced wastewater treatment. The process can effectively catalyze ozone to generate free radicals to mineralize refractory organic matters, and simultaneously overcomes the problems of difficult recovery of the catalyst, easy secondary pollution and the like caused by homogeneous catalysis. The reaction process mainly comprises the steps of adsorbing ozone molecules through active sites on the surface of a catalyst, decomposing the ozone molecules into active free radicals such as hydroxyl free radicals or superoxide free radicals with stronger oxidability, and reacting the active free radicals with organic pollutants adsorbed on the surface of the catalyst or in a water body, so that mineralization of the organic pollutants is realized. Therefore, the key of the heterogeneous ozone catalytic oxidation process is a high-efficiency catalyst, and extensive researchers at home and abroad have conducted extensive research on the catalyst. The heterogeneous ozone oxidation catalysts commonly used at present are various,