Adsorption of Dyes using Peat: Equilibrium and Kinetic Studies
Adsorption of Dyes using Peat: Equilibrium and Kinetic Studies
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DOI：
10.1080/09593332508618390
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发表时间：
2004-09
影响因子：
2.8
通讯作者：
L. Sepúlveda;K. Fernández;E. Contreras;C. Palma
中科院分区：
文献类型：
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作者：
L. Sepúlveda;K. Fernández;E. Contreras;C. Palma
近年来，吸附已被认为是最合适的废水脱色工艺之一。本文介绍了应用泥炭去除结构不同的染料（偶氮、恶嗪、三苯甲烷、噻嗪等）的实验结果，重点介绍了相关因素，如吸附质-吸附剂的化学性质、化学相互作用以及吸附条件。将平衡实验结果与Langmuir和Freundlich等温线进行拟合，得到各模型的特征参数。根据Langmuir方程的评估，22℃时碱性染料的最大吸附容量为Basic Blue 24为667(mg g-1)、Basic Green 4为526(mg g-1)、Basic Violet 4为714(mg g-1)。另一方面，酸性黑1仅为25(mg g-1)。进行了批量动力学研究，并根据化学吸附机制评估了数据。对于所有研究的系统，伪二阶模型提供了动力学实验数据的最佳相关性。本研究还使用了用于传质的膜孔双阻扩散模型来确定泥炭中碱性染料吸附的有效扩散率 Deff。
In recent years, adsorption has been accepted as one of the most appropriate processes for decolorization of wastewaters. This paper presents experimental results on application of peat for removal of structurally diverse dyes (azo, oxazine, triphenylmethane, thiazine and others) with emphasis on relevant factors such as the adsorbate-adsorbent chemical properties and chemical interaction as well as adsorption conditions. The equilibrium experimental results were fitted to Langmuir and Freundlich isotherms to obtain the characteristic parameters of each model. According to the evaluation using the Langmuir equation, the maximum sorption capacity of basic dyes at 22°C was 667 (mg g-1) for Basic Blue 24, 526 (mg g-1) for Basic Green 4 and 714 (mg g-1) for Basic Violet 4. On the other hand for Acid Black 1 it was only 25 (mg g-1). Batch kinetics studies were undertaken and the data evaluated in compliance with chemical sorption mechanisms. For all of the systems studied the pseudo-second order model provided the best correlation of the kinetic experimental data. A film-pore double resistance diffusion model for mass transfer has also been used in this study to determine the effective diffusivity, Deff, for the adsorption of basic dyes in to peat.