Dye adsorption of mesoporous activated carbons produced from NaOH-pretreated rice husks
Dye adsorption of mesoporous activated carbons produced from NaOH-pretreated rice husks
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NaOH预处理稻壳制备的介孔活性炭的染料吸附
DOI：
10.1016/j.biortech.2013.03.048
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发表时间：
2013-05-01
影响因子：
11.4
通讯作者：
Song, Xiao-Wei
中科院分区：
文献类型：
--
作者：
Lin, Long;Zhai, Shang-Ru;Song, Xiao-Wei
延续之前利用稻壳的工作，本研究旨在利用氢氧化钠预处理的RH残留物制备介孔活性炭，然后检查其染料吸附性能。基于氮气吸附/脱附等温线和透射电镜研究了活化温度和活化时间对活性炭表面积、孔体积和孔径半径的影响。使用亚甲基蓝作为模型吸附物评价了在最佳制备条件下获得的介孔活性炭的吸附行为。采用准一级和准二级模型研究了吸附动力学，利用Langmuir和Freundlich模型研究了吸附等温线。准二阶模型和 Langmuir 等温线被发现很好地拟合了所制备的介孔活性炭的吸附特性。还获得了吸附过程的热力学数据，以阐明由 NaOH 预处理的 RH 和 MB 分子产生的活性炭之间的吸附热化学。 (C) 2013 Elsevier Ltd. 保留所有权利。
In continuation of previous work on utilizing rice husks, this study aimed to prepare mesoporous activated carbons using residues of sodium hydroxide-pretreated RHs, and then examine their dye adsorption performance. The influences of the activation temperature and activation time on the surface area, pore volume, and pore radius of the activated carbon were investigated based on nitrogen adsorption/desorption isotherms and transmission electron microscopy. The adsorptive behavior of the mesoporous activated carbons obtained under optimum preparation conditions was evaluated using methyleneblue as the model adsorbate. The adsorption kinetics was studied by pseudo-first-and pseudo-second-order models, and the adsorption isotherms were studied by Langmuir and Freundlich models. The pseudo-second-order model and Langmuir isotherm were found to fit well the adsorption characteristics of the as-prepared mesoporous activated carbons. Thermodynamic data of the adsorption process were also obtained to elucidate the adsorption thermo-chemistry between the activated carbons produced from NaOH-pretreated RHs and MB molecules. (C) 2013 Elsevier Ltd. All rights reserved.