Carbon membranes were fabricated through the pre‐oxidation and pyrolysis of polyvinyl chloride (PVC). Their chemical composition and structure morphology were characterized using FTIR, SEM and XRD; their CO₂ and N₂ adsorption isotherms were measured at 25 °C. The experimental results showed that heating rate and holding time have great influences on the pore structure during the pre‐oxidation process as well as the carbonization process. The pore structure of the carbon membrane is also influenced by carbonization temperature. The carbon membrane obtained at 700 °C has the largest CO₂ adsorption capacity of 1.45 mmol/g at 101 kPa. The carbon membrane prepared at heating rate of 3 °C/min and holding time of 0.5 h at 800 °C displayed an excellent adsorption selectivity of CO₂ over N₂ evidenced by the fact that its CO₂ adsorption capacity could reach 1.1 mmol/g and while it does not significantly adsorb N₂.

中文翻译：

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碳化条件对聚氯乙烯衍生碳膜结构和气体吸附的影响

碳膜是通过聚氯乙烯（PVC）的预氧化和热解制成的。用FTIR，SEM和XRD表征了它们的化学组成和结构形态。在25°C下测量了它们的CO ₂和N ₂吸附等温线。实验结果表明，升温速率和保温时间对预氧化过程和碳化过程中的孔结构影响很大。碳膜的孔结构也受碳化温度的影响。在700°C下获得的碳膜具有最大的CO ₂101 kPa时的吸附容量为1.45 mmol / g。以3°C / min的加热速度和800°C下保持0.5 h的时间制备的碳膜对CO _2的吸附选择性优于N ₂，这是因为其CO ₂吸附能力可以达到1.1 mmol / g虽然它不显着吸收N ₂。