Toluene adsorption on various activated carbons with different pore structures

The toluene adsorption behavior of various activated carbons with different surface areas and pore structures was investigated by a static method at saturation concentration and a dynamic method at low concentration.The pore structures of these activated carbons were characterized by nitrogen adsorption at 77 K and ~(129)Xe-NMR measurements.Results showed that activated carbons with a larger pore volume have the higher toluene adsorption capacity at saturation concentration.But at low concentration,activated carbons with abundant micropores and a narrow pore size have a higher adsorption capacity.Among the investigated samples,pitch-based activated carbon fibers(ACFs) showed a better toluene adsorption capacity at low concentration(2×10~(-5)).With the increase of surface area for ACFs,the toluene adsorption capacities at low concentration(2×10~(-5)) increase slightly and for OG5A,OG10A,OG15A and OG20A at(30 ℃) were 202 mg/g,219 mg/g,221 mg/g and 235 mg/g respectively.