Sepúlveda L, Fernández K, Contreras E, Palma C
Chemical Engineering Dept., PO Box 10233, University of Santiago de Chile, Santiago, Chile.
Environ Technol. 2004 Sep;25(9):987-96. doi: 10.1080/09593332508618390.
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 degrees 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.
近年来，吸附已被公认为是废水脱色最合适的工艺之一。本文介绍了泥炭用于去除结构多样的染料（偶氮、恶嗪、三苯甲烷、噻嗪等）的实验结果，重点关注吸附质-吸附剂化学性质、化学相互作用以及吸附条件等相关因素。将平衡实验结果与朗缪尔等温线和弗伦德里希等温线拟合，以获得每个模型的特征参数。根据使用朗缪尔方程的评估，在22℃时碱性染料的最大吸附容量，碱性蓝24为667（mg g⁻¹），碱性绿4为526（mg g⁻¹），碱性紫4为714（mg g⁻¹）。另一方面，酸性黑1仅为25（mg g⁻¹）。进行了间歇动力学研究，并根据化学吸附机制对数据进行了评估。对于所有研究的系统，伪二级模型对动力学实验数据的相关性最佳。本研究还使用了传质的膜-孔双阻力扩散模型来确定碱性染料在泥炭中的有效扩散系数Deff。
