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首页> 外文期刊>Desalination and water treatment >Adsorption of methylene blue onto activated carbon obtained from ZnCl_2 activation of paulownia wood: kinetic and equilibrium studies
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Adsorption of methylene blue onto activated carbon obtained from ZnCl_2 activation of paulownia wood: kinetic and equilibrium studies

机译：桐木经ZnCl_2活化制得的活性炭上吸附亚甲基蓝的动力学和平衡研究

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摘要

In this study, an activated carbon was prepared from paulownia (P. tomentose) wood by chemical activation with ZnCl2. Pore properties including surface area, pore volume, pore size distribution and average pore diameter of the activated carbon were determined by N-2 adsorption at 77 K using the BET, t-plot and density functional theory (DFT) methods. The activated carbon had a BET surface area of 2736 m(2) g(-1) and total pore volume of 1.387 cm(3) g(-1). The use of activated carbon for the removal of methylene blue (MB) from aqueous solutions was investigated in a batch system different pH, initial dye concentrations contact times, temperatures and adsorbent doses. The extent of dye removal decreased with increasing initial MB concentration and increased with increasing contact time, temperature and adsorbent dosage. The equilibrium data were analyzed by the Langmuir and Freundlich isotherm models. The experimental data for the adsorption of MB dye fit the Langmuir isotherm model very well and the maximum monolayer adsorption capacity of the activated carbon was determined as 322.58, 384.61, 370.37 mg g(-1) for 25, 35 and 45 degrees C, respectively. The adsorption kinetics were found to follow a pseudo-second-order kinetic model. The changes in entropy (Delta S degrees) and heat of adsorption (Delta H degrees) for MB adsorption on activated carbon were positive.
机译：在这项研究中，活性炭是由桐木（P. tomentose）木材通过ZnCl2进行化学活化而制备的。使用BET，t-图和密度泛函理论（DFT）方法，通过在77 K下进行N-2吸附，确定了活性炭的孔隙特性，包括表面积，孔体积，孔径分布和平均孔径。活性炭的BET表面积为2736 m（2）g（-1），总孔体积为1.387 cm（3）g（-1）。在不同pH，初始染料浓度接触时间，温度和吸附剂量的分批系统中，研究了活性炭用于从水溶液中去除亚甲基蓝（MB）的用途。染料去除的程度随着初始MB浓度的增加而降低，并随着接触时间，温度和吸附剂剂量的增加而增加。通过Langmuir和Freundlich等温线模型分析平衡数据。 MB染料吸附的实验数据非常适合Langmuir等温模型，并且在25、35和45摄氏度下，活性炭的最大单层吸附容量分别确定为322.58、384.61、370.37 mg g（-1）。 。发现吸附动力学遵循伪二级动力学模型。活性炭上MB吸附的熵（ΔS度）和吸附热（ΔH度）的变化为正。

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