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CoFe2O4/N/C hollow nanosphere and preparation and application thereof

A hollow nanometer and nanosphere technology, applied in water/sludge/sewage treatment, other chemical processes, water/sewage treatment, etc., can solve the problems of difficult recycling of catalysts, large amount of metal ion leaching, and low catalytic efficiency. , to achieve the effect of being beneficial to secondary utilization, improving catalytic efficiency, enhancing adsorption and catalytic activity

Inactive Publication Date: 2017-07-28
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the technical problems of the existing heterogeneous Fenton-like catalysts, such as poor mechanical strength, strict pH requirements, large amount of metal ion leaching, low catalytic efficiency and difficult recovery and reuse of catalysts, thereby providing a CoFe 2 o 4 / N / C hollow nano-spherical catalyst, and can be coupled with persulfate to form a heterogeneous Fenton-like system to catalyze oxidation to remove organic pollutants

Method used

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  • CoFe2O4/N/C hollow nanosphere and preparation and application thereof
  • CoFe2O4/N/C hollow nanosphere and preparation and application thereof
  • CoFe2O4/N/C hollow nanosphere and preparation and application thereof

Examples

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Effect test

Embodiment 1

[0036] Example 1: CoFe 2 O 4 / N / C Hollow Nanosphere

[0037] (1) SiO 2 Preparation of nanospheres: add 2.6 mL of tetraethyl silicate, 108 mL of ethanol, 5 mL of deionized water, and 5 mL of ammonia (mass concentration 25%) into an Erlenmeyer flask, stir vigorously at room temperature for 12 hours, centrifuge, and wash with ethanol 3~5 times, vacuum drying at 80℃ to obtain SiO 2 Nano microspheres are 400mg, with a particle size of 150nm.

[0038] (2) Put 150mg SiO 2 Nanospheres were added to 150mL deionized water, after ultrasound, 150mg dopamine, 17.5mg Co(NO 3 ) 2 ·6H 2 O and 23.88mg FeCl 2 ·4H 2 O, adjust the pH to 8.5 with Tris-HCl buffer, start the reaction, mechanically stir at room temperature for 18 hours, rotate at 1300 rpm, and collect the black precipitate by centrifugation, wash with deionized water for 2 to 3 times and then vacuum dry at 80°C to obtain black particles 234mg.

[0039] (3) Put the black particles obtained in step (2) into a tube furnace in an argon atmosph...

Embodiment 2

[0045] CoFe prepared in Example 1 2 O 4 / N / C hollow nanospheres are used as heterogeneous Fenton-like catalysts to degrade wastewater containing 20mg / L cationic dye methylene blue. The degradation experiment was carried out in a 250ml Erlenmeyer flask. In 100ml wastewater, the final concentration of catalyst dosage was 0.1g / L based on the volume of wastewater, and the dosage of permonosulfate (PMS) was 0.8g / L based on the volume of wastewater. L, oscillate the reaction at 25°C and 250 rpm to mix the catalyst and the solution uniformly, take out the reaction solution from the reaction system at a certain interval, and measure the change of methylene blue concentration with the reaction time. CoFe 2 O 4 / N / C hollow nanosphere type heterogeneous Fenton-like catalyst for degradation of methylene blue Figure 4 Shown. Under the same conditions, the simulated wastewater + catalyst and simulated wastewater + PMS were used as controls.

[0046] From Figure 4 It can be seen that only u...

Embodiment 3

[0048] The material synthesized in step (3) in Example 1 was used as a catalyst for catalytic activity test, and the reaction conditions and steps were the same as in Example 2. The results showed that only 52% of the methylene blue was removed within 20 minutes, indicating that CoFe 2 O 4 The hollow configuration of the / N / C hollow nanosphere catalyst plays an important role, greatly improving the catalytic degradation efficiency of the catalyst.

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Abstract

The invention discloses a CoFe2O4 / N / C hollow nanosphere and preparation and application thereof. The preparation comprises: complexing dopamine with cobalt and iron metal ions under the condition of pH8-9 on a template as a SiO2 nanometer sphere to form a polymer shell layer, carbonization annealing to form N-doped carbon material loaded with CoFe2O4 metal nanoparticles, and finally, removing the SiO2 template with strong alkali to obtain CoFe2O4 / N / C hollow nanosphere. In the invention, the N / C matrix hollow structure is prepared by using the SiO2 nanosphere as the sacrificial template, theCoFe2O4 / N / C hollow nanosphere has a relatively large specific surface area and porosity, and can improve the distribution of CoFe2O4 nano metal particles loaded on the shell layer, enhance adsorption and catalytic activity on organic pollutants in waste water, and broaden the pH application range; the CoFe2O4 / N / C hollow nanosphere can be recycled due to magnetic performance, thus saving resources.

Description

[0001] (1) Technical field [0002] The invention relates to the technical field of wastewater treatment and environmental catalysis, in particular to a CoFe 2 O 4 / N / C hollow nanosphere type heterogeneous Fenton-like catalyst preparation method and application. [0003] (2) Background technology [0004] As a new type of water treatment technology, advanced oxidation technology can overcome the difficulty of effectively treating difficult-to-degrade organics in traditional processes, and has been widely studied. In recent years, based on sulfate radical (SO 4 ●- ) Advanced oxidation technology has become a new research hotspot, compared with OH ● , SO 4 ●- It has a longer half-life, which enhances the contact between free radicals and pollutants and facilitates their degradation of pollutants. At the same time, SO 4 ●- With OH ● The similar high redox potential (2.5-3.1V), even under neutral and alkaline conditions, also has strong activity, so it can efficiently oxidize and degra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/28B01J20/30B01J27/24C02F1/28C02F1/72C02F101/30C02F101/34C02F101/36
CPCB01J20/0259B01J20/06B01J20/103C02F1/281C02F1/725B01J20/28009B01J20/28021B01J27/24C02F2101/308C02F2101/345C02F2101/36B01J35/33
Inventor 曾滔俞明东张海燕何志桥宋爽
Owner ZHEJIANG UNIV OF TECH
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