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Magnetic Fenton-like catalyst and preparation method thereof

A catalyst and magnetic technology, used in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as iron sludge and catalyst recovery difficulties, and achieve good catalytic effect, good dispersibility and stability. Good results

Inactive Publication Date: 2017-12-15
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a preparation method and application of a magnetic solid composite catalyst, the materials required by the present invention are cheap and easy to obtain, the synthesis process is simple, and the prepared magnetic composite catalyst synergistically It has a good catalytic effect and can effectively reduce the dosage of hydrogen peroxide. It has the advantages of being environmentally friendly and recyclable. It overcomes the shortcomings of the classic Fenton reaction, which is easy to produce iron sludge and difficult to recycle the catalyst.

Method used

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  • Magnetic Fenton-like catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Magnetic Fe 3 o 4 / CeO 2 Preparation of Nanocomposite Catalysts

[0030] First add 100mL 0.2M NaOH into the three-necked flask, then add 0.154g nano-CeO 2 After heating to 80° C. in a water bath, nitrogen gas was passed through the mixture for 3 minutes to remove oxygen in the solution. Then, under electric stirring, 100mL containing 0.400g Fe was added dropwise 2 (SO 4 ) 3 and 2.224g FeSO 4 ·7H 2 The mixed solution of O was maintained at 80°C under nitrogen for 1 h. After the reaction is completed, under an external magnetic field, use the decantation method to wash (5-6 times) the obtained precipitate with twice distilled water. After the washing is completed, vacuum-dry it at a temperature of 60 ° C for 12 hours, and finally take out the dried product and grind it in a mortar. Measure the quality of the product and put it into a weighing bottle for later use.

experiment example 1

[0033] Under normal temperature and pressure, take a certain amount of methylene blue stock solution in 50mL water with a certain pH value to prepare methylene blue solutions with an initial concentration of 20mg / L and different pH values. The pH values ​​of the solutions are 2-7 respectively. Each solution of the same pH value was prepared in duplicate, and the initial absorbance of the solution (A 0 ); another part of the solution added a certain amount of composite catalyst and H 2 o 2 , so that the catalyst concentration after adding is 0.5g / L, H 2 o 2 The concentration is 1.0×10 -3 mol / L, placed in a 250mL Erlenmeyer flask and shaken at 180r / min for 30min in a temperature-controllable shaker. The degraded methylene blue absorbance (A) of the clear liquid was measured with an ultraviolet spectrophotometer, and the degradation rate was calculated according to the measurement results. Three parallel samples were made for each experimental point.

[0034] The results s...

experiment example 2

[0036] Under normal temperature and pressure, take a certain amount of methylene blue stock solution in 50mL water to prepare several parts of methylene blue solution with an initial concentration of 20mg / L and a pH value of 4. A certain amount of composite catalyst and different concentrations of H were added to each methylene blue solution 2 o 2 , so that the catalyst concentration after adding is 0.5g / L, H 2 o 2 Concentrations were 0.2, 0.5, 1.0, 2.0 and 3.0 (×10 -3 mol / L), placed in a 250mL Erlenmeyer flask and vibrated at 180r / min for 30min in a temperature-controlled shaker, after the reaction was completed, magnetically separated with a strong magnet, and the supernatant was centrifuged at 6000r / min, and taken twice The supernatant was measured with a UV spectrophotometer for the absorbance (A) of methylene blue after degradation, and the absorbance (A) of the initial methylene blue solution was measured simultaneously. 0 ), and calculate the degradation rate accord...

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Abstract

The invention protects a preparation method of magnetic Fe3O4 / CeO2 nano-complex and a method of treating a methylene blue solution by using the magnetic Fe3O4 / CeO2 nano-complex as a Fenton-like catalyst. The magnetic complex catalyst consists of a nano-ceria material which coats magnetic ferroferric oxide nanometer particles. The magnetic solid catalyst provided by the invention can be used as a heterogeneous catalyst to catalyze hydrogen peroxide to generate hydroxyl free radicals for degradation of methylene blue. By using the method provided by the invention, the degradation rate of methylene blue in 30 minutes reaches 90% or more.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment and relates to magnetic Fe 3 o 4 / CeO 2 A method for treating printing and dyeing wastewater with nanocomposite advanced oxidation technology. Background technique [0002] At present, my country's water pollution is becoming more and more serious. In sewage treatment, refractory and high-concentration organic wastewater produced by chemical, textile, pesticide, biomedical and other production processes is a difficult problem in sewage treatment technology. In order to control this kind of pollution, the current common technologies mainly include ozone oxidation, activated carbon adsorption, membrane separation, wet oxidation and Fenton oxidation. Compared with other methods, the Fenton oxidation method is widely used in the industry due to its advantages of fast oxidation rate, low cost and operating expenses. So far, the research on Fenton and Fenton-like reactions has a history...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J37/34C02F1/72B82Y30/00B82Y40/00C02F101/30C02F101/36C02F101/38
CPCB82Y30/00B82Y40/00C02F1/722C02F1/725B01J23/002B01J23/83B01J37/342C02F2101/308C02F2101/36C02F2101/38C02F2101/40C02F2305/026B01J35/33
Inventor 连宁陈楠王荣钰刘丹张雅珩
Owner JIANGSU UNIV OF TECH
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