On the other hand, using BN could realize deep defluorination of AFFF, but the process failed to treat AFFF at a volume higher than 200 μL (Figure ). Surprisingly, the BM using the combination of BN and SiO2 (e.g., [BN+SiO2]-BM) achieved > 70% defluorination when treating up to 500 μL AFFF (Figure ).