Tsai W T, Chang C Y, Wang S Y, Chang C F, Chien S F, Sun H F
Department of Environmental Engineering and Health, Chia Nan University of Pharmacy and Science, Tainan, Taiwan.
J Environ Sci Health B. 2001 Sep;36(5):677-86. doi: 10.1081/PFC-100106194.
In the present study, a series of activated carbons were prepared from agricultural waste corn cob by chemical and physical activations with potassium hydroxide (KOH)/potassium carbonate (K2CO3) and carbon dioxide (CO2). The effect of process variables such as impregnation ratio, impregnation time, activation temperature and soaking time of CO2 was studied in order to relate these preparation parameters with the physical properties of final carbon products. The resulting activated carbons were characterized by nitrogen adsorption-desorption isotherms at 77 K. The surface areas and pore volumes of carbons were estimated by the BET equation, the Langmuir equation and the t-plot method. Under the experimental conditions investigated, the main parameters in the activation of corn cob were found to be the impregnation ratio and activation temperature. The soaking time of CO2 is another important variable, which had a strong effect on the pore volume development. The BET surface area and total pore volume were as large as about 2000 m2/g and about 1.0 cm3/g, respectively. This study showed that the activation of agricultural waste corn cob with KOH/K2CO3 and CO2 was suitable for the preparation of large-surface-area activated carbons.
在本研究中，通过用氢氧化钾（KOH）/碳酸钾（K₂CO₃）和二氧化碳（CO₂）进行化学和物理活化，从农业废弃物玉米芯制备了一系列活性炭。研究了诸如浸渍比、浸渍时间、活化温度和CO₂浸泡时间等工艺变量的影响，以便将这些制备参数与最终碳产物的物理性质联系起来。通过在77 K下的氮气吸附-脱附等温线对所得活性炭进行表征。通过BET方程、朗缪尔方程和t-图法估算碳的表面积和孔体积。在所研究的实验条件下，发现玉米芯活化中的主要参数是浸渍比和活化温度。CO₂的浸泡时间是另一个重要变量，它对孔体积的发展有很大影响。BET表面积和总孔体积分别高达约2000 m²/g和约1.0 cm³/g。本研究表明，用KOH/K₂CO₃和CO₂对农业废弃物玉米芯进行活化适合于制备大表面积活性炭。
