Phosphoric acid article 20 Activated carbon 16 Adsorption 16 activated carbon 16 adsorption 12 phosphoric acid 12 Carbon 10 porosity 10 priority journal 10 Charcoal 8 Chemical activation 8 Surface properties 8 nitrogen 8 surface property 8 Activated carbon cloth 6 Activated carbon cloths 6 Isotherms 6 Microporosity 6 Microporous 6 Phosphoric acid activation 6 Temperature 6 cadmium 6 Acids 4 Activated carbons 4 Activating agents 4 Adsorption data 4 Atmospheric temperature 4 Cadmium 4 Carbon dioxide 4