Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, University of Minho, Campus de Gualtar 4710-057, Braga, Portugal.
J Hazard Mater. 2011 Feb 28;186(2-3):1241-8. doi: 10.1016/j.jhazmat.2010.11.131. Epub 2010 Dec 8.
The ability of four different clays to adsorb diethylketone was investigated in batch experiments aiming to treat wastewater with low solvent concentrations. The adsorption performance in terms of uptake followed the sequence: vermiculite>sepiolite=kaolinite=bentonite, for all the adsorbent doses tested (from 0.1 to 1.5 g) in 150 mL of ketone solution (800 mg/L). The equilibrium data in the batch systems were described by Sips and Dubinin-Raduskevich isotherms. The best fits for bentonite and kaolinite clays were obtained with the Sips isotherm and for sepiolite and vermiculite the best fits were obtained with the Dubinin-Raduskevich model. Kinetic data were described by pseudo-first and pseudo-second order kinetics models. The best fit was obtained for the pseudo-first order model which assumed that the interaction rate was limited only by one process or mechanism on a single class of sorbing sites and that all sites were time dependent. The presence of functional groups on the clay surface that might have interacted with the solvent was confirmed by FTIR. XRD analysis was also performed. This study showed that the tested clays are very effective for the removal of diethylketone from industrial effluents.
四种不同粘土吸附二乙基甲酮的能力在批量实验中进行了研究，旨在处理低溶剂浓度的废水。在 150 mL 酮溶液（800 mg/L）中，用 0.1 至 1.5 g 的所有吸附剂剂量测试时，吸附性能（以吸收率为序）：蛭石>海泡石=高岭土>膨润土，批次系统中的平衡数据用 Sips 和 Dubinin-Raduskevich 等温线进行描述。膨润土和高岭土粘土的最佳拟合是 Sips 等温线，而海泡石和蛭石的最佳拟合是 Dubinin-Raduskevich 模型。动力学数据用拟一级和拟二级动力学模型描述。对于假定仅由单个类别的吸附位上的一个过程或机制限制相互作用速率，并且所有位都是时间依赖的拟一级动力学模型，得到了最佳拟合。粘土表面上存在可能与溶剂相互作用的官能团，通过 FTIR 得到了证实。还进行了 XRD 分析。这项研究表明，测试用的粘土对从工业废水中去除二乙基甲酮非常有效。
