The effects of different modification methods on the performance of polypropylene (PP) honeycomb materials for purifying air pollutants, such as ammonia and trimethylamine, were investigated. A series of integrated indoor air purification materials were prepared by loading aluminum oxide and metal ion active components onto the PP substrate using a coating technique. The optimal preparation conditions were identified as follows: a PP honeycomb substrate pore size of 2.0 mm, choosing aluminum sol as the aluminum source, the pore-forming agent concentration of 0.1 mol/L, using calcium (Ca2?) and ferric (Fe3?) ions as modified metal ion type, the metal ion concentration of 0.3 mol/L, and impregnation coating time of 10 minutes. The resulting Ca2?/Fe3?-modified PP honeycomb purification materials achieved saturated ammonia adsorption capacities of 42 and 40 mg/mL, respectively. Furthermore, their ammonia purification performance remained stable after multiple thermal regeneration cycles. Finally, the as-prepared modified PP honeycomb materials were installed in air purification devices with different sizes and tested in 100 L and 30 m3 environmental cabin, respectively, still exhibiting good ammonia removal efficiency.