Manganese dioxide nanoflower and silicon oxide nanofiber compounding type catalyst 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, inhibition of agglomeration, and enhanced dispersion effects

Active Publication Date: 2017-12-12
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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  • Manganese dioxide nanoflower and silicon oxide nanofiber compounding type catalyst and preparation method thereof
  • Manganese dioxide nanoflower and silicon oxide nanofiber compounding type catalyst and preparation method thereof
  • Manganese dioxide nanoflower and silicon oxide nanofiber compounding type catalyst and preparation method thereof

Examples

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 manganese dioxide nanoflower and silicon oxide nanofiber compounding type catalyst and a preparation method thereof. The manganese dioxide nanoflower and silicon oxide nanofiber compounding type catalyst contains 30wt% to 60wt% of manganese dioxide nanoflower. The preparation method comprises the following steps of using the silicon oxide nanofiber as a carrier, using potassium permanganate as a manganese source, using persulfate as an oxidant, performing low-temperature hydrothermal reaction to produce the manganese oxide nanoflower, and loading the manganese oxide nanoflower onto the surface of the silicon oxide nanofiber, so as to obtain the manganese dioxide nanoflower and silicon oxide nanofiber compounding type catalyst. The manganese dioxide nanoflower and silicon oxide nanofiber compounding type catalyst has the advantages that the dispersivity in water is good, the fixing and forming are easy, the adsorbing ability is strong, the catalyzing activity is high, and the like; the process of the preparation technology is short, the operation is simple, the production efficiency is high, the energy consumption is low, the requirement on equipment is low, and the industrialized production is easily realized.

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 Applications(China)
IPC IPC(8): B01J23/34B82Y30/00B01J37/10B01J35/10C02F1/72
CPCB01J23/002B01J23/34B01J35/1019B01J37/10B82Y30/00C02F1/722C02F2305/026
Inventor 刘琨唐学昆冯其明李自顺敖敏琳
Owner CENT SOUTH UNIV
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