Pore development and the formation of oxygen functional groups were studied for activated carbon prepared from bamboo (Bambusa bambos) using a two-step activation with CO₂, as functions of carbonization temperature and activation conditions (time and temperature). Results show that activated carbon produced from bamboo contains mostly micropores in the pore size range of 0.65 to 1.4 nm. All porous properties of activated carbons increased with the increase in the activation temperature over the range from 850 to 950 °C, but decreased in the temperature range of 950 to 1000 °C, due principally to the merging of neighboring pores. The increase in the activation time also increased the porous properties linearly from 60 to 90 min, which then dropped from 90 to 120 min. It was found that the carbonization temperature played an important role in determining the number and distribution of active sites for CO₂ gasification during the activation process. Empirical equations were proposed to conveniently predict all important porous properties of the prepared activated carbons in terms of carbonization temperature and activation conditions. Oxygen functional groups formed during the carbonization and activation steps of activated carbon synthesis and their contents were dependent on the preparation conditions employed. Using Boehm’s titration technique, only phenolic and carboxylic groups were detected for the acid functional groups in both the chars and activated carbons in varying amounts. Empirical correlations were also developed to estimate the total contents of the acid and basic groups in activated carbons in terms of the carbonization temperature, activation time and temperature.

中文翻译：

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竹基活性炭CO2活化过程中孔隙发育和表面官能团形成分析


研究了采用CO ₂两步活化法制备的竹子（ Bambusa bambos ）活性炭的孔发育和氧官能团的形成，作为碳化温度和活化条件（时间和温度）的函数。结果表明，竹子活性炭主要含有孔径在0.65至1.4 nm范围内的微孔。在 850 至 950 °C 范围内，活性炭的所有多孔性能随着活化温度的升高而增加，但在 950 至 1000 °C 的温度范围内降低，这主要是由于相邻孔的合并。活化时间的增加也使多孔性能从 60 分钟线性增加到 90 分钟，然后从 90 分钟下降到 120 分钟。研究发现，炭化温度对活化过程中CO ₂气化活性位点的数量和分布起着重要的决定作用。提出了经验方程，可以方便地预测所制备的活性炭在碳化温度和活化条件方面的所有重要多孔特性。在活性炭合成的碳化和活化步骤期间形成的氧官能团及其含量取决于所采用的制备条件。使用 Boehm 滴定技术，仅检测到炭和活性炭中不同数量的酸官能团的酚基和羧基。还建立了经验相关性，以根据碳化温度、活化时间和温度来估计活性炭中酸性和碱性基团的总含量。