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Nano zero-valent iron modified porous cobaltosic oxide heterogeneous persulfate catalyst, and preparation method and application thereof

A technology of tricobalt tetroxide and nano-zero-valent iron, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., and can solve problems such as poor dispersion, easy oxidation, easy aggregation, etc. problem, to achieve the effect of fast degradation rate, low cost and high removal efficiency

Active Publication Date: 2020-04-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nZVI also has certain defects, such as easy aggregation, poor dispersion, easy oxidation, and difficult regeneration, so the application of nZVI alone is limited.
Not yet seen about nZVI and Co 3 o 4 Literature or patent reports on catalytic activation of persulfate by composite materials to generate active free radicals for degradation of antibiotics

Method used

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  • Nano zero-valent iron modified porous cobaltosic oxide heterogeneous persulfate catalyst, and preparation method and application thereof
  • Nano zero-valent iron modified porous cobaltosic oxide heterogeneous persulfate catalyst, and preparation method and application thereof
  • Nano zero-valent iron modified porous cobaltosic oxide heterogeneous persulfate catalyst, and preparation method and application thereof

Examples

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Embodiment 1

[0055] A nanometer zero-valent iron modified porous tricobalt tetroxide heterogeneous persulfate catalyst, the catalyst is prepared by the following method:

[0056] (1) Dissolve 4 g of dry yeast powder of Saccharomyces cerevisiae in 60 mL of deionized water, place it in a constant temperature shaking box at 35° C., and incubate at 180 rpm for 24 hours. Subsequently, 2g Co(CH 3 COO) 2 4H 2 O was added to the above-mentioned yeast liquid, and continued to shake at 35°C and 180rpm for 24h, then transferred to a high-pressure reactor, kept at 180°C for 12h, collected by centrifugation after cooling, washed once with ethanol, and washed with deionized water for 2 The second time, put it in a drying oven at 70°C for 12 hours and take it out to obtain a porous tricobalt tetroxide precursor. The porous tricobalt tetroxide precursor was put into a muffle furnace, the temperature was raised to 450 °C at a rate of 1 °C / min, and it was calcined at 450 °C for 2 h in an air atmosphere, ...

Embodiment 2

[0066] The effects of nano-nano zero-valent iron modified porous cobalt tetroxide heterogeneous catalysts with different nZVI doping amounts on the catalytic degradation of antibiotic tetracycline wastewater in persulfate system were investigated.

[0067] The nano-nano zero-valent iron modified porous tricobalt tetroxide heterogeneous catalyst and porous tricobalt tetroxide microspheres prepared in Example 1 of the present invention, and the pure cobalt tetroxide material prepared in Comparative Example 1 were applied to the persulfate system to treat and degrade antibiotic tetracycline wastewater. The steps are as follows: dilute the tetracycline stock solution concentration to 20 mg / L with deionized water, and use 0.5 mol / L H 2 SO 4 and NaOH solution to adjust the initial pH of the tetracycline solution to 6.0. Take respectively 5-Fe / CoY, 10-Fe / CoY, 15-Fe / CoY, 20-Fe / CoY and Co 3 o 4 -Y and pure Co in Comparative Example 1 3 o 4 Added to a tetracycline simulated wastewa...

Embodiment 3

[0069] The effect of different nanometer zero-valent iron modified porous cobalt trioxide heterogeneous catalyst dosage on tetracycline in antibiotic wastewater in persulfate system was investigated.

[0070] The different doses of nanometer zero-valent iron modified porous tricobalt tetroxide heterogeneous catalyst (10-Fe / CoY) prepared in Example 1 of the present invention are applied to the persulfate system to degrade the antibiotic tetracycline, and the steps are as follows: the tetracycline is deionized with deionized water Dilute the concentration of the mother liquor to 20mg / L, and use 0.5mol / L of H 2 SO 4 and NaOH solution to adjust the initial pH of the tetracycline solution to 6.0. Weigh respectively 2mg, 5mg, 8mg, 12mg of the 10-Fe / CoY heterogeneous persulfate catalyst in Example 1 and add it into the simulated tetracycline wastewater solution with a volume of 50mL and a concentration of 20mg / L. Disulfate (PDS) triggers the catalytic reaction, where the final conc...

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Abstract

The invention discloses a nano zero-valent iron modified porous cobaltosic oxide heterogeneous persulfate catalyst, and a preparation method and an application thereof. The preparation method for synthesizing the porous cobaltosic oxide heterogeneous persulfate catalyst by using a nano zero-valent iron modified yeast template technology comprises the following steps: firstly, synthesizing cobaltosic oxide microspheres with high specific surface area and porosity in a high-temperature environment by using Saccharomyces cerevisiae as a biological template; and loading nano zero-valent iron on the surface by an in-situ chemical reduction technology. The synthesized final catalyst is a heterogeneous iron-cobalt bimetallic composite material, and can effectively catalyze peroxydisulfate, whichhas a symmetrical structure and is difficult to activate, through the synergistic circulation effect between ions with different valence states of cobalt and iron. A generated active free radical group (SO4<.-> / .OH) can quickly and efficiently attack tetracycline molecules of antibiotics, and finally mineralize the tetracycline molecules into carbon dioxide and water molecules, so that the catalyst has certain practical application values.

Description

technical field [0001] The invention belongs to the field of multiphase persulfate material preparation and environmental water treatment, and in particular relates to a nanometer zero-valent iron modified porous tricobalt tetroxide multiphase persulfate catalyst and its preparation method and application. Background technique [0002] With the rapid development and continuous prosperity of medicine and aquaculture, the continuous accumulation of new antibiotic pollutants in surface waters seriously threatens the ecological environment and leads to the evolution of drug-resistant strains. For example, tetracycline, which represents one of the four major classes of antibiotics, is widely used because of its low price and broad-spectrum antibacterial properties. However, tetracycline that is not completely consumed during use enters the natural water environment. Traditional physical treatment methods are difficult to completely degrade tetracycline with stable aromatic struct...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J35/08B01J35/10B01J37/00C02F1/72C02F101/34C02F101/38
CPCB01J23/75B01J37/0018C02F1/722C02F1/725C02F2101/38C02F2101/34B01J35/51B01J35/60
Inventor 黄熙贤朱能武丁洋吴平霄
Owner SOUTH CHINA UNIV OF TECH
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