活化条件对活性碳纳米管比表面积的影响

以KOH为活化剂, 研究了多壁碳纳米管在制备活性碳纳米管过程中四个重要影响因素: 活化剂用量、活化温度、活化时间和活化过程中保护气体的流速对所得活性碳纳米管BET比表面积的影响并解释了原因. 研究表明上述四个因素都会对活性碳纳米管的比表面积产生较大的影响, 其中活化剂用量的影响最大, 在研究范围内可引起比表面积增大约241 m²?g^-1. 在这四个影响因素中除活性碳纳米管的比表面积随活化温度的增加而不断增加外, 其他三个影响因素的变化都会使活性碳纳米管的比表面积出现最大值, 而且四个影响因素的改变, 都不改变活性碳纳米管的孔洞主要是中孔和大孔的特点.

Effects of Activation Conditions on the Specific Surface Area of Activated Carbon Nanotubes

The effects of four important factors, including dosage of activating agent, activation temperature, activation time, and flow rate of protecting gas, on the specific surface area of activated carbon nanotubes (ACNTs) using KOH as the activating agent were discussed and the possible reasons were proposed. The results showed that the specific surface area of ACNTs could be greatly affected by modifying the four factors amongst which the dosage of activating agent was found to be the dominant one which could result about 241 m²?g^-1 of change in specific surface area. The specific surface area of ACNTs was only continuously enlarged with increasing the activation temperature, but had respective maximum with modifying the other factors in the experiments. The performance of meso-pores and macro-pores of the ACNTs was preserved in the process of modifying the four factors.