Comparative Experimental Study on the Comprehensive Filtration Performance of rGO-Modified PPS Composite Filter Media...

To address the issues of low efficiency, high resistance, and insufficient durability associated with traditional filter media in mine dust control. In this study, a series of reduced graphene oxide (rGO) modified composite filter media were successfully prepared by impregnating them in different concentrations (1, 3, 5 g/L) of graphene oxide (GO) aqueous dispersion and then reducing them in a hot water bath of l-ascorbic acid solution.Research findings indicate that as the impregnation concentration increases, the porosity of the filter material decreases from 74.11% to 72.72%, with the reduction amounting to less than 5%. At each concentration, filter media resistance increased with both filtration velocity and preparation concentration. At filtration velocities of 0.1-0.8 m/s, resistance variations were as follows: PPS (67-413 Pa), 1 g/L (71-438 Pa), 3 g/L (76-464 Pa), and 5 g/L (91-316 Pa). At a constant filtration velocity of 0.4 m/s, the resistance variation range was 213-260 Pa, with all resistance values showing a change amplitude below 15%. The particle capture efficiency of all four filter media increased with both particle size and impregnation concentration. The 3 g/L rGO novel composite filter material exhibited optimal comprehensive performance across particle size quality factor ranges of 0.00148-0.01439. After four filtration cycles, the PM₁₀, PM_2.5, and PM_1.0 filtration efficiencies of the 3 g/L rGO novel composite filter material ranged from 74.14% to 64.8%, 47.4% to 36.92%, and 21.77% to 12.71%, respectively. whereas PPS filter media recorded 68.65%-60.42%, 44.91%-35.54%, and 21.42%-11.64% respectively. The 3 g/L rGO novel composite filter material maintained higher filtration efficiencies overall, demonstrating superior performance to PPS filter media.This study provides valuable data references for addressing practical issues concerning mine dust and for the synthesis and application of novel filter materials.