Delta-MnO2 catalytic material, preparation method thereof and application of delta-MnO2 catalytic material in preparation of filter screen capable of degrading formaldehyde

The invention discloses a delta-MnO2 catalytic material, a preparation method of the delta-MnO2 catalytic material and application of the delta-MnO2 catalytic material in preparation of a filter screen capable of degrading formaldehyde. The preparation method of the delta-MnO2 catalytic material comprises the following steps: preparing a mixture solution from potassium permanganate, divalent manganese salt and organic acid; the mixture solution is filtered, washed and dried to obtain the delta-MnO2 catalytic material, the delta-MnO2 catalytic material is prepared through the technical scheme, the formaldehyde conversion rate is maintained to be 90% or above within 300 min in the room temperature environment with the formaldehyde concentration being 200 ppm, and indoor formaldehyde can be efficiently degraded; the filter screen capable of degrading formaldehyde prepared from the delta-MnO2 catalytic material is simple in preparation process, convenient to operate, low in price and suitable for large-scale prod