Laboratoire de Chimie Organique, Macromoléculaire et des Matériaux, Université de Mascara, Bp 763, Mascara, 29000, Algeria.
Environ Monit Assess. 2013 Dec;185(12):10365-75. doi: 10.1007/s10661-013-3338-5. Epub 2013 Aug 8.
Sodium montmorillonite (Na-M), acidic montmorillonite (H-M), and organo-acidic montmorillonite (Org-H-M) were applied to remove the herbicide 8-quinolinecarboxylic acid (8-QCA). The montmorillonites containing adsorbed 8-QCA were investigated by transmission electron microscopy, FT-IR spectroscopy, X-ray diffraction analysis, X-ray fluorescence thermogravimetric analysis, and physical adsorption of gases. Experiments showed that the amount of adsorbed 8-QCA increased at lower pH, reaching a maximum at pH 2. The adsorption kinetics was found to follow the pseudo-second-order kinetic model. The Langmuir model provided the best correlation of experimental data for adsorption equilibria. The adsorption of 8-QCA decreased in the order Org-H-M > H-M > Na-M. Isotherms were also used to obtain the thermodynamic parameters. The negative values of ΔG indicated the spontaneous nature of the adsorption process.
钠蒙脱石 (Na-M)、酸性蒙脱石 (H-M) 和有机酸性蒙脱石 (Org-H-M) 被用于去除除草剂 8-喹啉羧酸 (8-QCA)。通过透射电子显微镜、傅里叶变换红外光谱、X 射线衍射分析、X 射线荧光热重分析和气体物理吸附研究了吸附 8-QCA 的蒙脱石。实验表明，在较低的 pH 值下，吸附的 8-QCA 量增加，在 pH 2 时达到最大值。吸附动力学符合准二级动力学模型。Langmuir 模型为吸附平衡的实验数据提供了最佳的相关性。8-QCA 的吸附顺序为 Org-H-M > H-M > Na-M。等温线也用于获得热力学参数。ΔG 的负值表明吸附过程是自发的。
