Department of Chemical Engineering, National United University, Miao-Li 360, Taiwan.
J Environ Manage. 2011 Mar;92(3):708-13. doi: 10.1016/j.jenvman.2010.10.003.
Corncob hull was immersed in 25 wt% H(2)SO(4) and was carbonized in an oven at 290 °C for 2h to obtain the char. The char was then activated for 1h at 780 °C by KOH at weight ratio of KOH/char of 2.5, 3.0, and 3.5. SEM photos of the carbons revealed that the cell wall of corncob hull was etched into thin film structure. It was shown that the adsorption isotherms of methylene blue and 4-chlorophenol on the carbons were well fitted by the Langmuir equation. Moreover, the adsorption kinetics could be satisfactorily described by the Elovich equation. The normalized standard deviations are less than 2.8%. The high fraction of adsorption amount adsorbed within 1 min to that at saturation demonstrated the advantage of the prepared activated carbons. The fraction of adsorption amount within 1 min to that at saturation (q(1)/q(mon)) for the adsorption of 4-CP is high up to 0.807. Such quick adsorption behavior was mainly attributed to the presence of the thin film structure of carbons.
玉米芯被浸入 25wt%的 H(2)SO(4)中，并在 290°C 的烤箱中碳化 2 小时，以获得炭。然后，炭在 780°C 下用 KOH 活化 1 小时，KOH/炭的重量比为 2.5、3.0 和 3.5。碳的 SEM 照片显示，玉米芯的细胞壁被刻蚀成薄膜结构。结果表明，亚甲基蓝和 4-氯苯酚在碳上的吸附等温线很好地符合朗缪尔方程。此外，吸附动力学可以用 Elovich 方程很好地描述。归一化标准偏差小于 2.8%。在 1 分钟内吸附的吸附量与饱和时的吸附量之比（q(1)/q(mon)）高达到 0.807。对于 4-CP 的吸附，这种快速吸附行为主要归因于碳的薄膜结构的存在。
