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Manganese dioxide nano catalytic membrane for catalyzing ozone to degrade organic wastewater and preparation method thereof

A technology of manganese dioxide and nano-catalysis, applied in chemical instruments and methods, energy wastewater treatment, oxidized water/sewage treatment, etc., can solve the problems of slow mass transfer efficiency, reduce catalytic activity of catalytic ozonation reaction, etc., and prevent aggregation , multiple active sites, and high catalytic efficiency

Active Publication Date: 2020-09-04
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in heterogeneous catalysis, due to the natural aggregation tendency of metal catalysts, the number of metal sites exposed by supported metal catalysts is small, and the mass transfer efficiency is slow, thereby reducing the catalytic activity in catalytic ozonation reactions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of manganese dioxide nanocatalytic membrane: 2.95g manganese acetate and 1.31g hexadecyltrimethylammonium bromide were dissolved in 20mL n-methylpyrrolidone solvent, and ultrasonically treated at 65°C until the solution was clear and uniform Sol, transfer the reaction solution to a polytetrafluoroethylene autoclave, then immerse the AAO (50-60nm) film into the sol, react at 180°C for 4 hours, wait for the reaction kettle to cool naturally to room temperature, and take out the AAO after reaction The membrane was rinsed with deionized water, dried and calcined at 400° C. for 2 hours to obtain a manganese dioxide nanocatalytic membrane.

[0028] Prepare a wastewater solution with a rhodamine B concentration of 30 mg / L. Continuously bubble gaseous ozone in ultrapure water for 20 minutes to prepare an ozone stock solution with a concentration of 10 mg / L. Then in terminal filtration mode, rhodamine B and ozone stock solution are mixed by volume at 1:1 by peristal...

Embodiment 2

[0030] The preparation method of the manganese dioxide nano-catalyst membrane is the same as that in Example 1. The difference is that 1.96g of manganese acetate and 0.87g of cetyltrimethylammonium bromide are added.

[0031] Prepare a wastewater solution with a methyl orange concentration of 30 mg / L. Continuously bubble gaseous ozone in ultrapure water for 30 minutes to prepare an ozone stock solution with a concentration of 15 mg / L. Then in the terminal filtration mode, the methyl orange and the ozone stock solution are mixed by volume at a ratio of 1:1 by a peristaltic pump and then pumped into a filter equipped with a manganese dioxide nano-catalytic membrane, the flow rate is 0.8mL / min, once After filtering, the residence time is 1s, and the removal rate of the pollutant reaches over 95%.

Embodiment 3

[0033] The preparation method of the manganese dioxide nano-catalytic membrane is the same as that in Example 1, except that the pore diameter of the AAO membrane is 20-30nm.

[0034] Prepare a wastewater solution with a methylene blue concentration of 20 mg / L. Continuously bubble gaseous ozone in ultrapure water for 20 minutes to prepare an ozone stock solution with a concentration of 10 mg / L. Then, in the terminal filtration mode, the methylene blue and the ozone stock solution are mixed in a ratio of 1:1 by volume through a peristaltic pump and then pumped into a filter equipped with a manganese dioxide nano-catalytic membrane at a flow rate of 0.5mL / min. , the residence time is 1.2s, and the removal rate of the pollutant reaches more than 97%.

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Abstract

The invention provides a manganese dioxide nano catalytic membrane for catalyzing ozone to degrade organic wastewater and a preparation method of the manganese dioxide nano catalytic membrane, and belongs to the technical field of wastewater treatment. The preparation method comprises the following step: by taking an anodic aluminum oxide film as a template, loading manganese dioxide on the innerwall of a nanopore channel of an AAO film by utilizing a sol-gel method to form manganese dioxide circular nanotubes which are arranged in order, so as to obtain the manganese dioxide nanotube array catalytic membrane. Ozone is used as an oxidizing agent and can be activated into a strong oxidizing substance when passing through the manganese dioxide membrane, so that pollutants in the water bodyare degraded and removed. Compared with a liquid-phase catalytic reaction, the manganese dioxide nano catalytic membrane catalytic system strengthens mass transfer diffusion of pollutants and ozone tothe surface of the manganese dioxide catalyst due to the nano confinement effect, improves the production of oxidizing substances, and shows higher catalytic efficiency.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a manganese dioxide nano-catalyst membrane for catalyzing ozone to degrade organic waste water and a preparation method thereof. Background technique [0002] Printing and dyeing wastewater, nitrobenzene-containing wastewater, chemical and pharmaceutical wastewater, tannery wastewater, dye wastewater and other refractory organic wastewater have deep color, high salinity, and high concentration of pollutants, which are very harmful to the environmental water body. It is difficult to use a single Therefore, it is imminent to develop other treatment technologies to deal with these toxic and difficult-to-biodegrade organics. [0003] At present, research reports can be used to degrade organic wastewater, including biological oxidation, physical adsorption and advanced oxidation process. Advanced oxidation process is a very effective technology for treating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/00B01J35/02B01J35/10C02F1/72C02F1/78C02F101/30
CPCB01J23/34C02F1/725C02F1/78C02F2101/30B01J35/396B01J35/393B01J35/00B01J35/30B01J35/60B01J35/613Y02W10/37
Inventor 江波苏晴王婧茹关雨欣宁亚男刘奕捷唐沂珍
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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