Chemical Engineering Department, Santiago de Chile University, Santiago, Chile.
Environ Technol. 2013 Mar-Apr;34(5-8):967-77. doi: 10.1080/09593330.2012.724251.
The aim of this research was to study the effect of the solution temperature, pH and ionic strength on the adsorption of the Basic Blue 3 (BB3) and Acid Black 1 (AB1) dyes in Magellanic peat. The peat used was physically characterized as fibrous, of low decomposition level, without the presence of crystalline material and with a highly porous morphology. The functional groups with major concentration in the surface adsorbent were the carboxylics and phenolics, with values of 0.91 and 0.47 mmol/g, respectively. The results of the batch assays showed that the adsorption of the AB1 dye was strongly dependent of electrical charge density on the surface, contrary to what occurred to the BB3 dye, because the interactions between the dyes and carboxylic groups of the peat could be either electrostatic or non-electrostatic. The Langmuir, Freundlich and Sips isotherm models were fitted to the experimental data; among them, the Sips model presented the best adjustment quality. The maximum adsorption capacities for BB3 and AB1 dyes were 33.1 and 33.7 mg/g, respectively. The adsorption of BB3 dye onto Magellan peat has an exothermic behaviour, obtaining an adsorption enthalpy of -3.44 kJ/mol. Contrarily the adsorption of AB1 has an adsorption enthalpy of 56.76 kJ/mol.
本研究旨在研究溶液温度、pH 值和离子强度对碱性蓝 3（BB3）和酸性黑 1（AB1）染料在麦哲伦泥炭中的吸附的影响。所用的泥炭在物理上被描述为纤维状、低分解水平、没有结晶物质和高度多孔形态。表面吸附剂中主要浓度的官能团为羧酸和酚类，分别为 0.91 和 0.47 mmol/g。批量实验结果表明，AB1 染料的吸附强烈依赖于表面的电荷密度，而 BB3 染料则相反，因为染料与泥炭的羧酸基团之间的相互作用可能是静电的或非静电的。Langmuir、Freundlich 和 Sips 等温线模型拟合了实验数据；其中，Sips 模型的调整质量最好。BB3 和 AB1 染料的最大吸附容量分别为 33.1 和 33.7 mg/g。BB3 染料在麦哲伦泥炭上的吸附具有放热行为，获得的吸附焓为-3.44 kJ/mol。相反，AB1 的吸附焓为 56.76 kJ/mol。
