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Magnetic nano composite catalyst, as well as preparation method and application thereof

A composite catalyst, magnetic nanotechnology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Separation and other problems, to achieve the effect of high utilization efficiency, good removal effect and simple operation

Active Publication Date: 2017-06-09
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene nanomaterials are difficult to effectively separate from wastewater, which limits its application in the field of sewage treatment.
At present, there is no report on the organic combination of graphene and cobalt iron oxide for catalytic treatment of organic wastewater

Method used

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  • Magnetic nano composite catalyst, as well as preparation method and application thereof
  • Magnetic nano composite catalyst, as well as preparation method and application thereof
  • Magnetic nano composite catalyst, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The method for preparing cobalt iron oxide / graphene magnetic nanocomposite catalyst comprises the following steps:

[0037] (1) Get 80mg of graphene oxide powder and add it to 60mL of absolute ethanol, and ultrasonically treat it for 1h at a power of 50W to obtain a uniformly dispersed graphene mixture;

[0038] (2) Take 0.146g Co(NO 3 ) 2 ·6H 2 O and 0.403g Fe(NO 3 ) 3 9H 2 Add O (the molar ratio of cobalt to iron is 1:2) into 20ml of absolute ethanol, stir at room temperature for 30min, and obtain a uniform mixture;

[0039] (3) mixing and stirring the graphene mixed solution obtained in step (1) with the mixed solution obtained in step (2) for 30 min, then adjusting the pH to 10 with 6M NaOH, and continuing to stir for 30 min to obtain a dark green reaction precursor solution;

[0040] (4) Transfer the reaction precursor solution obtained in step (3) to a hydrothermal reaction kettle, conduct hydrothermal reaction at 180°C for 20h, centrifuge and wash the obtai...

Embodiment 2

[0043]In order to verify the effect of the cobalt iron oxide / graphene magnetic nanocomposite catalyst prepared in Example 1 on activating potassium hydrogen persulfate to treat acetamiprid wastewater, the following three sets of experiments were done.

[0044] Test Ⅰ

[0045] A conical flask was used as the reactor, the reaction volume of the acetamiprid wastewater was 50 mL, the initial concentration of acetamiprid was 20 mg / L, and the pH was 7.0. Simultaneously in reactor, add embodiment 1 to prepare gained catalyst, make its solid content be 0.12g / L, add potassium hydrogen persulfate and make its concentration be 0.3g / L, then reactor is placed in shaker, rotating speed is 150rpm , react at room temperature, take samples regularly, and detect the remaining concentration of acetamiprid with a liquid chromatograph.

[0046] Test II

[0047] Potassium hydrogen persulfate was not added, and the other conditions were the same as experiment Ⅰ.

[0048] Test III

[0049] No cob...

Embodiment 3

[0052] Example 1 The prepared cobalt iron oxide / graphene magnetic nanocomposite catalyst was used to activate potassium hydrogen persulfate to treat acetamiprid wastewater with different initial pH.

[0053] Adopt Erlenmeyer flask as reactor, acetamiprid wastewater reaction volume is 50mL, the initial concentration of acetamiprid is 20mg / L, with 1M NaOH and H 2 SO 4 Adjust the initial pH of the acetamiprid wastewater to be 3, 5, 7, 9 respectively, add the catalyst prepared in Example 1 to the reactor simultaneously so that its solid content is 0.12g / L, add potassium hydrogen persulfate to make its concentration 0.3 g / L, and place the reactor in a shaker with a rotating speed of 150rpm and a temperature of room temperature. Samples were taken regularly, and the remaining concentration of acetamiprid was detected with a liquid chromatograph.

[0054] For specific processing results, see image 3 .

[0055] image 3 The results showed that the degradation effect of acetamipr...

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Abstract

The invention discloses a magnetic nano composite catalyst, in particular to a preparation method of a ferrocobalt oxide / graphene magnetic nano composite catalyst and an application of the magnetic nano composite catalyst in degrading organic wastewater. The catalyst acts on sulfate radicals with a strong oxidizing property generated by peroxysulfate and therefore efficiently removes organic matters from the wastewater. The catalyst serving as a solid phase catalyst has larger specific surface area, higher catalytic activity and a lower ion release rate, so that the catalyst can continuously and efficiently activate the sulfate radicals generated by peroxysulfate and effectively reduce cobalt ion leakage. The preparation method of the catalyst is simple; the catalyst has high catalytical performance, does not cause secondary pollution and is an environment-friendly material; since the catalyst is magnetic and can be recycled after reaction, the treatment cost of the organic wastewater is lowered; wide application prospects are provided for the treatment of the degradation-resistant organic wastewater.

Description

technical field [0001] The invention belongs to nanocomposite materials, in particular to a preparation method of a cobalt iron oxide / graphene magnetic nanocomposite catalyst and its application in treating organic wastewater. Background technique [0002] Water pollution has become one of the important factors restricting social and economic development. In particular, organic wastewater with strong toxicity, high concentration, and refractory biodegradation has brought unprecedented challenges to traditional sewage biological treatment processes. In recent years, advanced oxidation water treatment technology based on strong oxidizing free radicals (such as hydroxyl radicals) has attracted much attention. Due to the strong oxidizing properties of free radicals, organic matter in wastewater can usually be decomposed into non-toxic or low-toxic small molecule organic matter, and even completely mineralized and transformed into water and carbon dioxide. Among them, the Fento...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75C02F1/72C02F1/66C02F101/30
CPCC02F1/66C02F1/725B01J23/75C02F2101/30B01J35/33B01J35/40
Inventor 丁大虎姜灿烂陈立伟蔡天明孙文杰
Owner NANJING AGRICULTURAL UNIVERSITY
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