Mesoporous activated coconut shell-derived hydrochar prepared via hydrothermal carbonization-NaOH activation for methylene blue adsorption
Mesoporous activated coconut shell-derived hydrochar prepared via hydrothermal carbonization-NaOH activation for methylene blue adsorption
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DOI：
10.1016/j.jenvman.2017.07.029
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发表时间：
2017-12-01
影响因子：
8.7
通讯作者：
Hameed, B. H.
中科院分区：
文献类型：
--
作者：
Islam, Md. Azharul;Ahmed, M. J.;Hameed, B. H.
以椰壳废弃物为原料，采用水热炭化-NaOH化学活化法制备了中孔活性炭。用不同的水热炭：NaOH浸渍比（1：1、1：2和1：3）获得三组活性炭。在这些比例中，1：3（COSHTC 3）表现出最佳的吸附亚甲基蓝（MB）。COSHTC 3在pH 3-11和30 ℃下吸附MB，初始浓度为25-250 mg/L。COSHTC 3对亚甲基蓝的吸附等温线表明，在30 ℃时，最大单分子层吸附量为200.01 mg/g，符合Langmuir吸附等温式。数据拟合良好的伪二级（PSO）动力学模型。结果表明，以廉价农业废弃物（椰子壳）为原料制备的COSHTC 3平均孔径为28.6埃，比表面积为876.14 m2/g，是一种较好的阳离子染料吸附剂，为开发廉价染料吸附剂奠定了基础。(C)2017爱思唯尔有限公司版权所有
Mesoporous activated carbon was prepared using a hydrochar derived from coconut shell waste through hydrothermal carbonization and NaOH chemical activation process (COSHTC). Three sets of activated carbons were obtained with different hydrochar:NaOH impregnation ratios (1:1, 1:2, and 1:3). Among these ratios, 1:3 (COSHTC3) exhibited the optimum adsorption for methylene blue (MB). COSHTC3 adsorbed MB with an initial concentration of 25-250 mg/L at pH 3-11 and 30 degrees C. The adsorption isotherm of MB on COSHTC3 demonstrated that Langmuir isotherm could be better applied at a maximum monolayer adsorption capacity of 200.01 mg/g at 30 degrees C. The data was well fitted to the pseudo-second-order (PSO) kinetic model. These results show that the COSHTC3 prepared from low-cost agricultural waste (coconut shell) with average pore diameter 28.6 angstrom and surface area 876.14 m(2)/g acts as a better adsorbent for removal of cationic dyes and could pave the way for more low-cost adsorbents for dye removal. (C) 2017 Elsevier Ltd. All rights reserved.