Marco-Brown Jose L, Gaigneaux Eric M, Torres Sánchez Rosa M, Dos Santos Afonso María
a Facultad de Ciencias Exactas y Naturales, Departamento de Química Inorgánica, Analítica y Química Física, and CONICET-Universidad de Buenos Aires, Instituto de Química Física de los Materiales, Medio Ambiente y Energía (INQUIMAE), Ciudad Universitaria Pabellón II 3er Piso, Int. Güiraldes 2160 (C1428EHA) , Universidad de Buenos Aires , Buenos Aires , Argentina.
b Institute of Condensed Matter and Nanosciences (IMCN), Division Solids, Molecules and Reactivity (MOST) , Université Catholique de Louvain , Louvain-la-Neuve , Belgium.
J Environ Sci Health B. 2019;54(4):281-289. doi: 10.1080/03601234.2018.1561055. Epub 2019 Feb 12.
The picloram (PCM) adsorption on nontronite, illite and kaolinite was studied at pH 3, 5 and 7. The adsorption isotherms had well-fitted to Langmuir and Freundlich models equations. The interactions of PCM with the clay mineral surfaces exhibited an anionic profile adsorption, with a decrease in adsorption when the pH increases. The PCM adsorption capacity increases in the following order: kaolinite < illite < nontronite. The X-ray diffraction (XRD) analysis of PCM-clay samples revealed that the picloram molecule does not enter into the clays basal space. The interaction of PCM with clays surface sites through nitrogen of the pyridine ring was confirmed by X-ray photoelectron spectroscopy (XPS). Due to the anionic form of PCM, the adsorption onto the external and edges surface sites of the clay minerals was proposed.
研究了在pH值为3、5和7时，毒莠定（PCM）在绿脱石、伊利石和高岭土上的吸附情况。吸附等温线与朗缪尔和弗伦德利希模型方程拟合良好。PCM与粘土矿物表面的相互作用呈现出阴离子型吸附，随着pH值升高吸附量降低。PCM的吸附容量按以下顺序增加：高岭土＜伊利石＜绿脱石。PCM-粘土样品的X射线衍射（XRD）分析表明，毒莠定分子未进入粘土的层间空间。X射线光电子能谱（XPS）证实了PCM通过吡啶环的氮与粘土表面位点发生相互作用。由于PCM呈阴离子形式，推测其吸附在粘土矿物的外表面和边缘表面位点上。
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