High adsorption of methylene blue by activated carbon prepared from phosphoric acid treated eucalyptus residue
High adsorption of methylene blue by activated carbon prepared from phosphoric acid treated eucalyptus residue
复制标题
磷酸处理桉树渣制备的活性炭对亚甲基蓝的高吸附
DOI：
10.1016/j.powtec.2020.02.013
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发表时间：
2020-04-15
影响因子：
5.2
通讯作者：
Liu, Zuguang
中科院分区：
文献类型：
--
作者：
Han, Qiaoning;Wang, Jing;Liu, Zuguang
活性炭具有大的比表面积（1545m(2)）。G(-1))和总酸密度(2.47 mmol。采用磷酸处理桉木渣热活化法制备了亚甲基蓝（g(-1)），并成功用于模拟染料废水处理，对亚甲基蓝（MB）的吸附量高达977 mg.g（-1）。磷酸/桉木渣质量比和活化温度可调节活性炭的结构特性和酸性官能团。随着活化温度的降低，酸性官能团可以使吸附模式由平面吸附转变为侧向吸附，从而增强对MB的吸附。拟二级动力学和Langmuir等温线模型很好地描述了吸附过程，并证明了粒子间扩散涉及多线性阶段。这些发现为利用桉树废渣在工业规模上有效处理染料废水提供了重要的见解。(C) 2020 Elsevier B.V.版权所有
Activated carbon with large specific surface area (1545 m(2).g(-1)) and total acid density (2.47 mmol.g(-1)) was prepared by thermal activation of phosphoric acid treated eucalyptus residue, and was successfully used for simulated dye wastewater treatment where it showed high methylene blue (MB) adsorption capacity (977 mg.g(-1)). The textural properties and acidic functional groups of the activated carbon could be adjusted and controlled by phosphoric acid/eucalyptus residue mass ratios and activation temperature. Moreover, acidic functional groups could enhance MB adsorption by converting the adsorption pattern from planar to side adsorption with a decrease in activation temperature. The adsorption process was well described by the pseudo-second order kinetics and the Langmuir isotherm model, and it was demonstrated that infra-particle diffusion involved multi-linear stages. These findings provide important insights for the efficient treatment of dye wastewater on an industrial scale using waste eucalyptus residue. (C) 2020 Elsevier B.V. All rights reserved.