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Hollow ceria microsphere-supported ferrihydrite heterogeneous Fenton-like catalyst and its preparation method and application

The technology of ceria and ferrihydrite is applied in the field of hollow ceria microsphere-supported ferrihydrite heterogeneous Fenton-like catalyst and its preparation, which can solve the problem of low catalytic activity of pollutants and achieve high removal efficiency, The effect of promoting activation rate and fast degradation rate

Active Publication Date: 2020-05-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalytic activity of ferrihydrite alone to pollutants in the Fenton-like system is not high

Method used

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  • Hollow ceria microsphere-supported ferrihydrite heterogeneous Fenton-like catalyst and its preparation method and application
  • Hollow ceria microsphere-supported ferrihydrite heterogeneous Fenton-like catalyst and its preparation method and application
  • Hollow ceria microsphere-supported ferrihydrite heterogeneous Fenton-like catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A kind of hollow ceria microsphere loaded ferrihydrite heterogeneous Fenton catalyst, the catalyst is prepared by the following method:

[0061] (1) Take 1g dry powder of Saccharomyces cerevisiae and 1g Ce(NO 3 ) 3 ·6H 2 O, dissolved in 20 mL of deionized water, and ultrasonicated for 60 min at room temperature to obtain a mixed solution. Add 10mL NaOH aqueous solution (containing 0.2g NaOH) dropwise to the mixture, shake it at 160rpm for 1h at room temperature, collect it by centrifugation after static aging at room temperature for 12h, and wash once with ethanol and twice with deionized water. The obtained precipitate was vacuum-dried at 80°C for 6 hours, taken out, put into a muffle furnace, heated to 600°C at a rate of 1°C / min, calcined at 600°C for 2 hours, and then cooled naturally to obtain hollow ceria Nanospheres (hCeO 2 ).

[0062] (2) Dissolve 0.025g, 0.05g, 0.075g, 0.1g and 0.125g of the hollow ceria nanospheres prepared in step (1) in 30mL of deionized...

Embodiment 2

[0071] Investigating different hCeO 2 Effect of ferrihydrite heterogeneous Fenton-like catalysts supported by doped hollow ceria microspheres on photo-Fenton-catalyzed degradation of antibiotic tetracycline wastewater.

[0072] The hollow ceria microsphere-loaded ferrihydrite heterogeneous Fenton-like catalyst prepared in Example 1 of the present invention and the pure ferrihydrite (fh) material prepared in Comparative Example 1 were applied to tetracycline wastewater light-Fenton Catalytic degradation treatment, the steps are as follows: dilute the tetracycline stock solution concentration to 20mg / L with deionized water, and use 1.0mol / L H 2 SO 4 and NaOH solution to adjust the initial pH of the tetracycline solution to 4.0. Weigh respectively the 5-hCeO in 20mg embodiment 1 2 / fh, 10-hCeO 2 / fh, 15-hCeO 2 / fh, 20-hCeO 2 / fh, 25-hCeO 2 / fh heterogeneous Fenton-like catalyst and the fh in Comparative Example 1 were added to the simulated tetracycline wastewater solution...

Embodiment 3

[0074] The effect of different dosages of ferrihydrite heterogeneous Fenton-like catalysts loaded on hollow ceria microspheres on photo-Fenton catalytic degradation of antibiotic tetracycline wastewater was investigated.

[0075] The ferrihydrite heterogeneous Fenton-like catalyst (15-hCeO 2 / fh) is applied to the photo-Fenton catalytic degradation treatment of tetracycline wastewater, the steps are as follows: dilute the tetracycline stock solution concentration to 20mg / L with deionized water, and use 1.0mol / L H 2 SO 4 and NaOH solution to adjust the initial pH of the tetracycline solution to 4.0. Weigh respectively 10mg, 20mg, 40mg, 60mg of 15-hCeO in Example 1 2 / fh heterogeneous Fenton-like catalyst was added to the simulated tetracycline wastewater solution with a volume of 50mL and a concentration of 20mg / L, and it was shaken for 1h under the condition of avoiding light to reach the adsorption equilibrium, and then a certain amount of hydrogen peroxide was added to mak...

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Abstract

The invention discloses a hollow cerium dioxide microsphere supported ferrihydrite heterogeneous Fenton-like catalyst and a preparation method and application thereof. The preparation method of the hollow cerium dioxide microsphere supported ferrierite heterogeneous Fenton-like catalyst comprises the following steps: firstly, preparing porous cerium dioxide nanospheres by using Saccharomyces cerevisiae as a biological template in a high-temperature environment; and then, loading the porous cerium dioxide nanospheres on the surface of ferrierite by in-situ deposition. The mesoporous ceria nanospheres in the catalyst have a photosensitive effect, can generate photo-generated carriers in response to visible light, and promote the activation efficiency of the ferrihydrite on hydrogen peroxide in a Fenton system. Generated active free groups have broad-spectrum catalytic degradation effect on pollutants and have certain practical application value.

Description

technical field [0001] The invention belongs to the field of preparation of multiphase Fenton-like materials and environmental water treatment, and in particular relates to a multiphase Fenton-like catalyst loaded with hollow ceria microspheres and ferrihydrite, a preparation method and application thereof. Background technique [0002] In the near future, the accumulation of new pollutants such as antibiotics in surface water will lead to the evolution of drug-resistant strains and environmental pollution. According to reports, tetracycline, one of the four major classes of antibiotics, ranks first among antibiotics in China in terms of annual output. And because of its stable aromatic structure and functional groups, it is difficult to degrade naturally in the environment. Traditional physical treatment methods cannot degrade this new type of pollutant. Therefore, advanced oxidation technology, especially hydrogen peroxide (H 2 o 2 ) as an oxidizing agent has been paid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01J37/08B01J37/34B01J37/03B01J37/36C02F1/72C02F101/30C02F101/36C02F101/38
CPCB01J23/83B01J35/004B01J37/0018B01J37/031B01J37/082B01J37/343B01J37/36C02F1/722C02F1/725C02F2101/30C02F2101/34C02F2101/345C02F2101/38C02F2101/40C02F2305/026C02F2305/10
Inventor 朱能武黄熙贤丁洋吴平宵
Owner SOUTH CHINA UNIV OF TECH
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