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A kind of composite catalyst of manganese dioxide nanoflower and silica nanofiber and preparation method thereof

A composite catalyst, nanofiber technology, applied in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problem of limited surface area for manganese growth and support, and achieve excellent catalysis Activation, enhanced dispersion, and the effect of large specific surface area

Active Publication Date: 2020-09-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In existing reports, micron-sized carriers are mostly selected, which can provide limited surface area for manganese dioxide growth and loading; and the morphology of carriers is mostly granular and flake-like, and no fibrous or nanofibrous carriers have been seen yet.
In addition, the reported morphology of nano-manganese dioxide is mostly simple shapes such as granular, flake, rod, and fibrous, and other complex shapes are rare.

Method used

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  • A kind of composite catalyst of manganese dioxide nanoflower and silica nanofiber and preparation method thereof
  • A kind of composite catalyst of manganese dioxide nanoflower and silica nanofiber and preparation method thereof
  • A kind of composite catalyst of manganese dioxide nanoflower and silica nanofiber and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 4g of silica nanofibers (the nanofibers have a diameter of 30-60 nm and a length of 5-20 μm), and completely disperse them in 1L of water under vigorous stirring to form a uniform primary suspension. Weigh 7.40 g of potassium permanganate and 3.20 g of sodium persulfate (the concentration of sodium persulfate is 13.4 mmol / L), add them into the above-mentioned primary suspension under stirring conditions, and keep stirring for 10 min to completely dissolve to obtain secondary suspension. The above-mentioned secondary suspension was transferred into an autoclave for hydrothermal reaction at 90° C. for 4 hours. After the reaction was over, it was naturally cooled to room temperature. The suspension after the hydrothermal reaction was separated from solid to liquid, and the separated solid product was washed with water three times, and dried in a drying oven at a temperature of 80°C to constant weight to obtain the final manganese dioxide nanoflowers and silica nanof...

Embodiment 2

[0031]Weigh 5g of silica nanofibers (the nanofibers have a diameter of 20-50 nm and a length of 3-10 μm), and completely disperse them in 1L of water under vigorous stirring to form a uniform primary suspension. Weigh 4.3 g of potassium permanganate and 2.70 g of potassium persulfate (concentration of potassium persulfate is 10 mmol / L), add them into the above-mentioned primary suspension under stirring, and keep stirring for 10 min to completely dissolve to obtain secondary suspension. The above-mentioned secondary suspension was transferred into an autoclave for hydrothermal reaction at 95° C. for 4.5 hours. After the reaction was over, it was naturally cooled to room temperature. The suspension after the hydrothermal reaction was separated from solid to liquid, and the separated solid product was washed with water three times, and dried in a drying oven at a temperature of 80°C to constant weight to obtain the final manganese dioxide nanoflowers and silica nanofibers Comp...

Embodiment 3

[0033] Weigh 5g of silica nanofibers (the nanofibers have a diameter of 40-100 nm and a length of 10-20 μm), and completely disperse them in 1L of water under vigorous stirring to form a uniform primary suspension. Weigh 6.90 g of potassium permanganate and 3.80 g of ammonium persulfate (the concentration of ammonium persulfate is 16.7 mmol / L), add them to the above primary suspension under stirring, and keep stirring for 10 min to completely dissolve to obtain secondary suspension. The above-mentioned secondary suspension was transferred into an autoclave for hydrothermal reaction at 85° C. for 5 hours. After the reaction was over, it was naturally cooled to room temperature. The suspension after the hydrothermal reaction was separated from solid to liquid, and the separated solid product was washed with water three times, and dried in a drying oven at a temperature of 80°C to constant weight to obtain the final manganese dioxide nanoflowers and silica nanofibers Composite ...

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Abstract

The invention discloses a catalyst composed of manganese dioxide nanoflowers and silica nanofibers and a preparation method thereof. The content of manganese dioxide nanoflowers in the catalyst is 30 wt% to 60 wt%. The preparation method is: Silicon oxide nanofibers are used as carriers, potassium permanganate is used as the manganese source, and persulfate is used as the oxidant. Through low-temperature hydrothermal reaction, manganese oxide nanoflowers are produced and loaded on the surface of the silicon oxide nanofibers to form manganese dioxide nanoflowers and silicon oxide. Nanofiber composite catalyst. The composite catalyst of manganese dioxide nanoflowers and silica nanofibers in the present invention has outstanding advantages such as good dispersion in water, easy fixation and molding, strong adsorption capacity and high catalytic activity. The preparation process of the invention is short, simple to operate, high in production efficiency, low in energy consumption, low in equipment requirements, and easy to realize industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental protection functional materials, nanometer materials and catalytic materials, and in particular relates to a novel composite heterogeneous Fenton catalyst and a preparation method thereof. Background technique [0002] With the acceleration of industrialization, the sources, types and discharges of organic wastewater are increasing. Many organic wastewaters are highly toxic, posing a huge threat to the ecological environment and human survival, and how to degrade them has attracted much attention. Compared with the traditional Fenton-catalyzed method, based on the sulfate radical (SO 4 ●- )’s advanced catalytic oxidation technology has many advantages such as wide working pH range, strong catalytic performance, no by-products, high efficiency, and convenient transportation and storage of pharmaceuticals, and is receiving more and more attention and attention. Catalyst perfo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B82Y30/00B01J37/10B01J35/10C02F1/72
CPCB82Y30/00C02F1/722B01J23/002B01J23/34B01J37/10C02F2305/026B01J35/615
Inventor 刘琨唐学昆冯其明李自顺敖敏琳
Owner CENT SOUTH UNIV
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