Large band (100 MHz-4 GHz) dielectric caracterization of powdered activated carbon. Study of the effect of acidic washing

The measuring method used for characterizing a material, consists of simula ting a coaxial cell containing a material by a formula that connects the fi lled material cell impedance to its complex permittivity in the area of fre quency 100 MHz-4 GHz without establishing an equivalent electrical diagram. The application example proposed is powdered activated carbon, due to its importance in the area of water processing [1, 2]. The dielectric character ization of powdered activated carbon before and after washing by acidic sol utions allowed the demonstration of superficial conductivity and dipolar re laxation phenomena; the increase of its conducting properties is dearly dem onstrated.