Removal of fine aerosol particles from air flows are very important for both public health and protection of special workplace.High-efficiency particulate air filters (HEPA) filters, which are defined as air filters with filtration efficiency over 99.97% for 0.3 μm aerosols, are usually used to remove sub-micron aerosol particles.Generally, HEPA filters are composed of a mat of randomly arranged fibers with diameters between 0.5 and 2.0 μm.These micron fibers have very limited specific surface area.As a result,the high filtration efficiency of the HEPA filters are usually achieved at the expense of high flow resistance and low dust holding capacity.Carbon nanotubes (CNTs) are very promising to be used as air filter media due to their high specific surface area and excellent adsorption capability.