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Preparation and application of multi-layer core-shell structure magnetic nano-photocatalyst

A multi-layer core-shell structure, photocatalyst technology, applied in the field of nanocomposite materials and photocatalysis, can solve the problems of low photocatalytic efficiency, and achieve the effects of high recovery rate and regeneration rate, controllable particle size, and good monodispersity.

Pending Publication Date: 2019-04-12
JINHUA KEHAI TESTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Immobilizing photocatalysts on glass and other materials can solve the problem of separation and recovery of central photocatalysts, but their photocatalytic efficiency is significantly lower than that of suspension systems

Method used

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  • Preparation and application of multi-layer core-shell structure magnetic nano-photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] ① Synthesis of Ag@Fe3O4 nanoparticles: Add Fe(NO3) 9H2O (4mmol), NaAc (35mmol) and AgNO3 (0.59mmol) to ethylene glycol (40mL), stir magnetically until completely dissolved and transfer to polytetrafluoroethylene In an inner stainless steel autoclave, react at 200°C for 8 hours. After the reaction, it was washed several times with ethanol, collected by magnetic force, and dried overnight in a vacuum oven at 60°C.

[0028] ②Synthesis of Ag@Fe3O4@SiO2 nanoparticles: Mix 38mL ethanol and 6mL deionized water, add 0.1gAg@Fe3O4 nanoparticles, stir mechanically, add 2mL ammonia water, then drop 0.38mL TEOS into the mixture, and stir for 3 hours , The resulting product was washed several times with ethanol, collected by magnetic force, and dried overnight in a vacuum oven at 50°C.

[0029] ③Synthesis of Ag@Fe3O4@SiO2@ZnO nanoparticles: ZnNO3×6H2O (0.3 g) was dissolved in DMF (50 mL), NaOH (0.04 g) was dissolved in deionized water (2 mL), Ag@Fe3O4@SiO2 (0.5 g) Sonication Dissol...

Embodiment 2

[0032] Same as Example 1, the difference from Example 1 is that the autoclave reaction temperature in step 1) is 160°C.

Embodiment 3

[0034] Same as Example 1, the difference from Example 1 is that the autoclave reaction temperature in step 1) is 240°C.

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Abstract

The invention discloses preparation and application of a multi-layer core-shell structure magnetic nano-photocatalyst. The preparation of the photocatalyst comprises the following steps: (1) adoptinga hydrothermal method to synthesize magnetic-silver core-shell nano-particles; (2) using a modified Stob method to coat the magnetic-silver core-shell structure nano-particles with silica so as to obtain silica-coated magnetic-silver core-shell nano-particles; and (3) adopting a coprecipitation method to synthesize the magnetic-silver-zinc oxide core-shell structure nano-photocatalyst. The multi-layer core-shell structure magnetic nano-photocatalyst has a good photocatalytic effect, a uniform particle size and good dispersibility, can be separated by magnetic force, and has broad application prospects.

Description

technical field [0001] The invention specifically belongs to the fields of nanocomposite materials and photocatalysis. It specifically relates to a multilayer core-shell structure magnetic nano photocatalyst, a preparation method of the multilayer core shell structure magnetic nano photocatalyst, and an application of the multilayer core shell structure magnetic nano photocatalyst in dye degradation. Background technique [0002] Azo dyes have the largest variety and quantity among dyes, accounting for more than half of the total organic dye products, and are one of the main pollutants of dye wastewater. They usually have one or more azo bonds (–N=N–) , and associated aromatic system and auxochrome (–OH, –SO3, etc.) characteristics, its poor biodegradability, high toxicity and potential mutagenic and carcinogenic hazards, so the treatment of azo dyes has attracted great attention. [0003] At the end of the 1970s, a large number of reports have been reported on the use of p...

Claims

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Application Information

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IPC IPC(8): B01J23/89C02F1/30C02F101/38
CPCC02F1/30B01J23/002B01J23/8953C02F2101/38C02F2305/10B01J2523/00B01J35/33B01J35/39B01J2523/842B01J2523/18B01J2523/41B01J2523/27
Inventor 金德军蔡美强包芳芳苏洁
Owner JINHUA KEHAI TESTING
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