Preparation method and application of magnetic separable heterogeneous Fenotn catalyst CeO2/MZFS

A catalyst and magnetic separation technology, applied in the field of environmental engineering, can solve the problems of unrealistic water body, slow catalytic reaction rate, poor degradation effect of OFLX, etc., and achieve the effect of reducing content, reducing harm and reducing emissions

Active Publication Date: 2018-12-21
CHENGDU UNIV OF INFORMATION TECH
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AI Technical Summary

Problems solved by technology

However, using nano-CeO alone 2 As a heterogeneous Fenotn-like catalyst, its catalytic reaction rate is slow and its degradation effect on OFLX is poor
[0007] Using magnetic MZFS or nano-CeO alone 2 As a heterogeneous Fenotn-like catalyst, it is impossible to realize the

Method used

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  • Preparation method and application of magnetic separable heterogeneous Fenotn catalyst CeO2/MZFS
  • Preparation method and application of magnetic separable heterogeneous Fenotn catalyst CeO2/MZFS
  • Preparation method and application of magnetic separable heterogeneous Fenotn catalyst CeO2/MZFS

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The preparation of embodiment 1 magnetic carrier MZFS:

[0043] a. Put manganese zinc ferrite in a three-necked flask, add 0.05mol L -1 150mL of citric acid solution, stirred and reacted in a water bath at 40°C for 30-200min, and the optimum value of 180min was adopted in this example;

[0044]b. Use ammonia water to adjust the pH to 5.5, heat and stir in a water bath at 40°C for 30-200 minutes, and adopt the optimum value of 180 minutes in this embodiment;

[0045] c. Use ammonia water to adjust the pH to 10, slowly add TEOS dropwise to the three-necked flask, the mass ratio of TEOS to manganese zinc ferrite is 2.4:1, heat and stir in a water bath at 40°C for 60-300min, the most used in this example The best value is 240min;

[0046] d. After the reaction is completed, let it stand for cooling, remove the supernatant, and filter and wash the lower sediment with absolute ethanol and distilled water for 3 times, and then dry it in a positive air drying oven at 60°C for...

Embodiment 2

[0047] Example 2 Different cerium loadings on CeO 2 Influence of / MZFS Catalytic Performance

[0048] Take the cerium nitrate required when the loading amount of cerium is 1%, 3%, 5%, 7%, and 9% respectively (the loading amount is calculated by the ratio of the mass of cerium to the total mass of manganese, zinc and iron in MZFS), and place them in a crucible, Add 1.8mL of distilled water, stir with a glass rod to completely dissolve the cerium nitrate, add 2g of MZFS, stir evenly, let it soak for 30 minutes, put it in a water bath at 70°C for 20 minutes, and use a muffle furnace to roast at 200°C for 60 minutes in an air atmosphere After natural cooling and grinding, CeO with different loadings was prepared 2 / MZFS. figure 1 After degrading OFLX for 120min, CeO with different cerium loadings 2 The catalytic effect of / MZFS can be clearly seen from the figure. When the load is 7%, the COD removal rate can reach 41.9%, and the OFLX removal rate (1-C / C 0 ) is 72.6%, so the c...

Embodiment 3

[0049] Embodiment 3 roasting temperature is to CeO 2 Influence of / MZFS Catalytic Performance

[0050] Take the required cerium nitrate when the loading capacity is 7%, put it in a crucible, add 1.8mL distilled water, stir with a glass rod to completely dissolve the cerium nitrate, add 2g MZFS, stir evenly, let it stand for 30min, and fry it in a water bath at 70°C Dry for 20 minutes, use muffle furnace, under air atmosphere, bake at 175°C, 200°C, 250°C, 300°C, 350°C for 60 minutes, cool naturally, and grind to obtain CeO with different firing temperatures 2 / MZFS, to verify their catalytic performance respectively, the results are as follows figure 2 .

[0051] figure 2 (a) CeO prepared for different calcination temperatures 2 / MZFS catalytic degradation of OFLX removal efficiency (C / C 0 ) figure, the removal effect of OFLX is the best when the calcination temperature is 200°C, and the removal rate of OFLX is 72.6% when it is degraded for 120 minutes. At 175°C, the de...

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Abstract

The invention discloses a preparation method of a magnetic separable heterogeneous Fenotn catalyst CeO2/MZFS. The preparation method comprises the following steps that (1) cerium nitrate is dissolvedin water, a magnetic carrier MZFS is added to be stirred uniformly, and then the mixture is dipped for 10-180 minutes; (2) the mixture is heated at the temperature of 50-90 DEG C and stirred and rolled continuously till the water is evaporated completely; and (3) the evaporated sample is calcinated for 20-100 minutes at the temperature of 175-350 DEG C under the air atmosphere and then naturally cooled and ground, and the magnetic separable Fenotn catalyst CeO2/MZFS is obtained. CeO2 and MZFS in the magnetic heterogeneous Fenotn catalyst CeO2/MZFS have the synergic catalysis effect, and CeO2/MZFS have the good catalysis degradation and mineralization effects on OFLX (ofloxacin).

Description

technical field [0001] The invention belongs to the field of environmental engineering, in particular to a magnetically separable heterogeneous Fenotn-like catalyst CeO 2 / MZFS preparation method and application. Background technique [0002] Pharmaceutical and Personal Care Products (PPCPs) are representative "emerging micro-pollutants" with a huge amount of production and use, various types, and complex biological composition and activity. At present, water body micro-pollution It has become an environmental issue of worldwide concern. PPCPs mainly include various antibiotics, synthetic musk, medical drugs, detergents, fungicides, cosmetics and insect repellents. After being absorbed and metabolized by the human body, medicines enter the aquatic environment along with excreta; while personal care products enter the water directly after people use them; in addition, some discarded and expired medicines will eventually flow into urban domestic sewage . In recent years, C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889C02F1/72C02F101/38C02F101/36C02F101/34
CPCB01J23/002B01J23/8892B01J35/0033B01J2523/00C02F1/722C02F1/725B01J2523/27B01J2523/3712B01J2523/41B01J2523/72B01J2523/842
Inventor 余静王盈盈郝旗
Owner CHENGDU UNIV OF INFORMATION TECH
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