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

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.