Activated Carbon

unlikely, since very high surface area is essential.

Seeing as how there's no chemist around, let me take a stab at this. If you try to carbonize plastic, you'll be releasing some really nasty gasses into the environment... Considering, however, that not all of us are environmentally minded, I'm guessing you'd have a hard time getting a good, pure carbon product. I'm guessing there would be a lot of nasty stuff left in the carbon, until you burned it to ashes.

Also, as the other poster said, activated charcoal has an ungodly amount of surface area because of its porosity. Something like a square mile in a cubic centimeter. This is a byproduct of what the carbon was made of. I don't see you getting that type of surface area from carbonized plastic. - but, then again, just my thoughts.

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Hey! I'm here, Vermin! Depending on the plastic, heat will either de-polymerize the polymer back into monomer (plus a lot of unknown material), as in acrylates, or just degrade the polymer/plastic. It would have to be done either in a vacuum or under inert gas. Due to all the other elements, besides carbon, that are present in many plastics (nitrogen, etc), and the fact that there are no operating plastic-to-activated carbon plants around, I would not think this would be a practical venture. Plastics/polymers like polyurethanes can generate phosgene, carbon monoxide, nitrogen oxides, etc on strong heating. That's often the killer in airplane crashes and fire.

Thanks! While not knowing much about the by-products, I kind of thought that something like you described would be the result.