Method for in-situ generation of nanoflower-like manganese dioxide catalyst on filter material

Patent metadata

Field	Value
Publication number	US-11565241-B2
Application number	US-201616322133-A
Country	US
Kind code	B2
Filing date	Sep 12, 2016
Priority date	Sep 12, 2016
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

A method for in-situ generation of nanoflower-like manganese dioxide catalyst on filter material is provided. The method comprises: immersing a filter material in a solution containing sodium lauryl sulfate and nitric acid; first modifying the surface of the filter material by using the sodium lauryl sulfate so that a charge layer is wound around the surface of the filter material and tightly absorbs H + in an acid solution; and then adding potassium permanganate as an oxidant to react with H 30 on the surface of the filter material to generate nano flower-like manganese dioxide in situ on the surface of the filter material, so as to obtain a composite filter material having a denitration function.

First claim

What is claimed is:

1. A method for in-situ generation of a nanoflower shaped manganese dioxide catalyst on a filter material, comprising the steps of: immersing the filter material in a solution containing sodium lauryl sulfate and nitric acid; first modifying a surface of the filter material through the sodium lauryl sulfate in the solution so that a charge layer is wound around the surface of the filter material and the surface of the filter material sufficiently absorbs H + in the solution; and then adding potassium permanganate to the solution to react with H 30 on the surface of the filter material to generate the nanoflower shaped manganese dioxide in-situ on the surface of the filter material, so as to obtain a composite filter material having a denitration function;
wherein a concentration of the sodium lauryl sulfate is 0.1-2 g/L and a concentration of the nitric acid is 0.01-0.2 M in the solution;
wherein the filter material is a polyphenylene sulfide needle felt filter material;
the method comprising the following preparation steps:
1) immersing the filter material in the solution containing the sodium lauryl sulfate and the nitric acid, and dispersing for 1h by using ultrasonic waves so that the sodium lauryl sulfate is sufficiently adsorbed on the surface of the filter material;
2) after the solution of step 1) is heated to 60-80° C., adding the potassium permanganate and further stirring for reaction for 0.5-2 h so that the potassium permanganate reacts with the H 30 on the surface of the filter material to generate the nanoflower shaped manganese oxide in-situ; and
3) rinsing the filter material obtained in step 2) with deionized water and ethanol, and drying it in a vacuum oven at 110° C. for 6 h to obtain a composite filter material with a denitration function;
wherein a concentration of the potassium permanganate in step 2) is 0.01-0.2M.

Assignees

• Univ Fuzhou

Inventors

• Zheng Yuying
• Chen Jian

Classifications

• B01D2255/2073

  Manganese · CPC title

• B01J37/0207

  Pretreatment of the support · CPC title

• B01D53/8628

  Processes characterised by a specific catalyst · CPC title

• B01J37/0236

  Drying, e.g. preparing a suspension, adding a soluble salt and drying · CPC title

• B01J20/28028

  Particles immobilised within fibres or filaments · CPC title