Phosphoric acid activation Adsorption 8 activated carbon 8 Activated carbon 6 Carbon 6 Phosphoric acid 6 Surface properties 6 Temperature 6 adsorption 6 isotherm 6 nitrogen 6 Activated carbon cloth 4 Adsorption capacities 4 Adsorption data 4 Carbon dioxide 4 Charcoal 4 Heat treatment 4 Inert atmospheres 4 Isotherms 4 Microporosity 4 Microporous 4 Microporous materials 4 Nitrogen isotherms 4 Porous structures 4 Regenerated cellulose 4 Textural parameters 4 Thermal treatment 4 Thermal treatment temperature 4 Trace analysis 4 article 4