Integrated filter material and preparation method and application thereof

An integrated filter material, wherein the filter material is prepared by the following methods:

• a. cutting a filter material a into a disc, immersing the disc in an aqueous solution of a surface dispersant, stirring for 1 h to 2 h, and then drying at 100° C. to 120° C. for 4 h to 6 h to obtain a surface dispersant-modified filter material b;
• b. adding distilled water dropwise to the filter material b slowly until the filter material has been fully infiltrated, to determine a saturated water absorption amount of the filter material;
• c. calculating a concentration of an aqueous solution of a catalyst precursor according to a required load and the saturated water absorption amount of the filter material, wherein the calculation method is as follows:
• (1) calculating a number of moles of each metal component in the catalyst required for an area filter material when the load requirement is met, and calculating the mass of a required metal precursor according to the number of moles of each component;
• and
• (2) concentration of aqueous solution of each component in catalyst precursor=mass of each component of metal precursor/saturated water absorption amount of filter material;
• immersing the filter material b obtained in step a in the aqueous solution of the catalyst precursor and taking out the filter material b after thorough stirring for 4 h to 6 h according to the foregoing calculation;
• further immersing the taken-out filter material in an aqueous solution of oxalic acid and standing for 10 h to 12 h;
• and then drying to obtain a filter material c;
• d. adding acetone dropwise to the filter material c until the filter material has been fully infiltrated, to determine a saturated acetone absorption amount of the filter material;
• e. determining a concentration of an acetone solution of vanadium oxytrichloride according to the saturated acetone absorption amount of the filter material c and the required load, wherein the calculation method is as follows:
• concentration of acetone solution of vanadium oxytrichloride=the number of moles of required V2O5* relative molecular mass of vanadium oxytrichloride/saturated acetone absorption amount of filter material;
• immersing the filter material c obtained in step c in the acetone solution of vanadium oxytrichloride and taking out after standing for 4 to 6 h;
• and soaking the filter material c in an aqueous solution of sodium hydroxide with a pH value of 7.5 to 8.5, standing for 4 h to 6 h, and drying at 105° C. to 115° C. for 10 h to 12 h to obtain a filter material d;
• and
• f. placing the filter material d in a reactor, pouring absolute ethanol, reacting in a vacuum drying oven at 180° C. to 220° C. for 10 h to 14 h, taking out the filter material after the reactor is cooled, drying at 60° C. to 80° C. for 4 h to 6 h, and then finishing preparation, wherein the load in step c is 50 g/m2 to 150 g/m2, the metal precursor is manganese nitrate and cerium nitrate, and a molar ratio of manganese and cerium is (3-8):1.