Black carbon NPs 9 is yet another way to purify water. In this study, 9 a highly efficient bilayer photothermal functional membrane (denoted as CBMCE) was developed by depositing carbon black nanoparticles (CBNPs) dispersion on a mixed cellulose ester (MCE) substrate by simple vacuum filtration. To further increase water production, a multilayer enhanced evaporator (MEER) was fabricated by bonding an optimized CBMCE with polystyrene foam and air bedding paper. The MEER achieved a maximum Automated Endoscope Reprocessor (AER) production at 5.6 kg.m -2 .h -1 with an evaporation rate of 124% percents and an evaporation efficiency of 123.5%; the efficiency is calculated as η = ṁ(h S +h LV ) I × 100%, where ṁ is the mass evaporation rate, h S = c(T f -T i ) is the sensible heat defined by the specific heat of water and initial and final temperatures T i,f , h LV the liquid-vapor phase change entalpy.