ptgIm sorry but I dont understand what you mean by ptg Can you provide more context or information富氮多孔有机聚合物的制备及其碘吸附性前言

Oh, I see. "ptg" is likely an abbreviation for "preliminary technical guide". However, without more context, it's difficult to say for sure. The rest of your message appears to be related to the preparation of nitrogen-rich porous organic polymers and their iodine adsorption properties.