Preparation method of Fe3O4@SiO2@ZnO magnetic nano photocatalyst

Abstract

A preparation method of a Fe3O4@SiO2@ZnO magnetic nano photocatalyst includes the steps of: 1) weighing 2.24 g of Zn(CH3COO)2.2H2O and adding the Zn(CH3COO)2.2H2O to 100 ml of a DEG solution with supersonic assistance for dissolution, and microwave-heating the solution to prepare a first intermediate reaction solution; 2) weighing 0.2 g of Fe3O4@SiO2 and adding the Fe3O4@SiO2 to 20 ml of a DEG solution with supersonic assistance for dissolution, and microwave-heating the solution to prepare a second intermediate reaction solution; 3) mixing the two intermediate reaction solutions and microwave-heating the solution to obtain a mixture reaction solution; and 4) cooling the mixture reaction solution to room temperature, performing centrifugal separation, and cleaning and drying the product. Compared with a photocatalyst in the prior art, the Fe3O4@SiO2@ZnO has stronger photocatalytic activity, better stability, and wider application range, and has advantage on reduction of secondary pollution due to excellent magnetic separation performance.

Description

technical field [0001] The invention relates to the field of catalyst preparation, specifically a Fe 3 o 4 @SiO 2 Preparation method of @ZnO magnetic nanophotocatalyst. Background technique [0002] Photocatalyst is a general term for chemical substances that can catalyze degradation under the excitation of photons, accelerate or slow down photochemical reactions, but do not participate in the reaction themselves. Under normal temperature conditions, materials whose conductivity is between that of conductors and insulators are called semiconductor materials. Semiconductor materials with certain photocatalytic degradation ability are called semiconductor photocatalysts. The synthesis method of magnetic ZnO is simple and fast, and has the characteristics of environmental protection, non-toxicity, low cost, high stability, strong photocatalytic activity and easy recycling. It can effectively remove organic pollutants that are difficult to biodegrade in water, and is an idea...

AI Technical Summary

Problems solved by technology

However, the current synthesis methods have problems such as energy consumption, time-consuming, toxic dispersants or raw materials, and the synthesized materials have poor stability, low photocatalytic activity and poor solid-liquid separation effect, which are problems that need to be solved urgently.

The exploration of magnetic ZnO by researchers at home and abroad mostly stays at the stage of degrading the dye solution, and there are few reports on the research and literature on the treatment of p-nitrophenol wastewater that is difficult to biodegrade, and further research and application are urgently needed

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