Thiết bị lọc không khí kết hợp với một bộ lọc bọc bởi các hạt nano bạc với một quang xúc tác nano TiO2 để sử dụng trong các bệnh viện

X-ray diffraction, scanning electron microscopy and transmission electron microscopy showed that TiO2 particles synthesized by a sol-gel procedure exhibited uniform size about 16-20 nm. This nanopowder was deposited on a porous quartz tube (D=74 mm, L=418 mm, deposit density ~ 16.4 mg cm-2) through an intermediate adhesive polymethylmethacrylate layer to manufacture a photocatalytic filter tube. A polypropylene pre-filter was coated with a nanosilver layer (particle size ~ 20 nm) prepared by aqueous molecular solution method. An air cleaner of 250 m3/h capacity equipped with this pre-filter, an electrostatic air filter, 4 photocatalytic filter tubes and 4 UV-A lamps (36 W) presented the high degradation ability for certain volatile organic compounds (VOCs), bacteria and fungi. The VOCs degradation performances of the equipment with respect to divers compounds are different: in a 10m3 box, 91.6 percent of butanol was removed within 55 min, 80 percent of acetone within 100 min, 70.1 percent of diethyl ether within 120 min and only 43 percent of benzene was oxidized within 150 min. Over 99 percent of bacteria and fungi were killed after the air passage through the equipment. For application, it was placed in the intensive care room (volume of 125 m3) of E hospital in Hanoi; 69 percent of bacteria and 63 percent of fungi were killed within 6h.