in a curved shape said process for producing said powder containing a carbon nanotube or nanofiber comprises a pretreatment a sensitization treatment an activation treatment an electroless plating treatment and a growth treatment said powder containing a carbon nanotube or nanofiber can be applied for treating various pollutants in the environment such as pollutants existing in air water sludge and soil application_number US 5325705 A description in order to achieve those objectives of the invention a process for producing a powder containing a carbon nanotube or nanofiber is provided said process comprising selecting particles with a size in the order of micrometer and using as a carrier these particles exhibit certain characteristics such as chemical stability no pollution to the environment low cost and the like such particles include such as for example al 2 o 3 sio 2 tio 2 cao sic wc and the like these carriers are cleaned by washing under shaking in an acidic solution containing hcl h 2 so 4 hf and the like to remove dirt on the surface of the carrier and render atoms in the surface of the carrier into an activated state next they are sensitized in a solution containing sncl 2 followed by activated in a solution containing pdcl 2 so as to deposit a layer of catalytic substance over the surface of the carrier for facilitating the electroless plating of fe co ni or alloy thereof thereafter an electroless plating with a solution containing fe co or ni ions is carried out to plate a metal layer of fe co ni.