Characterization of the Natural and Organomodified Clay Soil of Moukosso (Republic of Congo) by Dimethylsulfoxide: Application to the Adsorption of Lead (II) in Aqueous Solution  

作　　者：Ottard Arnaud M. R. Ossiby Mwa Ngo Ferland Ngoro-Elenga Erman E. Nzaba Madila Zita F. Diamouangana Mpissi Exaucé R. Kinzonzi Ngongot Joseph Marie Moutou Ottard Arnaud M. R. Ossiby Mwa Ngo;Ferland Ngoro-Elenga;Erman E. Nzaba Madila;Zita F. Diamouangana Mpissi;Exaucé R. Kinzonzi Ngongot;Joseph Marie Moutou(Laboratoire de Chimie Minérale et Appliquée, Faculté des Sciences et Techniques, Université Marien Ngouabi, Brazzaville, Congo;Faculté des Sciences et Techniques, Université Marien Ngouabi, Brazzaville, Congo;Centre de Recherches Géologiques et Minières, Brazzaville, Congo;Institut de Recherche sur l’Hydrogène, Université du Québec à Trois-Rivières, Québec, Canada;Ecole Normale Supérieure, Université Marien Ngouabi, Brazzaville, Congo)

机构地区：[1]Laboratoire de Chimie Minérale et Appliquée, Faculté des Sciences et Techniques, Université Marien Ngouabi, Brazzaville, Congo [2]Faculté des Sciences et Techniques, Université Marien Ngouabi, Brazzaville, Congo [3]Centre de Recherches Géologiques et Minières, Brazzaville, Congo [4]Institut de Recherche sur l’Hydrogène, Université du Québec à Trois-Rivières, Québec, Canada [5]Ecole Normale Supérieure, Université Marien Ngouabi, Brazzaville, Congo

出　　处：《Materials Sciences and Applications》2023年第2期63-77,共15页材料科学与应用期刊（英文）

摘　　要：In this study, the authors characterized the raw clayey soil of Moukosso and modified by dimethylsulfoxide (DMSO) by several analytical methods, namely: X-ray diffraction (XRD), Fourier transform infrared (FTIR) and gravimetric thermal analysis (TGA). The cation exchange capacity (CEC) was also determined. Mineralogical analysis by XRD revealed the presence of muscovite (29.7%), kaolinite (8.9%), anatase (2.4%) and quartz (58.9%). The characterization of the organo-clay by infrared and by thermogravimetric analysis confirmed the intercalation of DMSO by the presence of vibration bands at 1008 cm^-1 and 1070 cm^-1 and a strong increase in the loss of mass. The cation exchange capacity of the raw material is 7.4 meq/100g. Rapid adsorption of Pb²⁺ ions was observed between 5 and 15 minutes of stirring time in both cases (raw clay and organomodified clay). The modeling of the isotherms by the models of Langmuir and Freudlich showed that these are of type S with a maximum amount of adsorption of 22.471 mg/g for the fine fraction and 41.493 mg/g for the clay intercalated with DMSO. Langmuir’s model best reproduces the experimental data of this study.In this study, the authors characterized the raw clayey soil of Moukosso and modified by dimethylsulfoxide (DMSO) by several analytical methods, namely: X-ray diffraction (XRD), Fourier transform infrared (FTIR) and gravimetric thermal analysis (TGA). The cation exchange capacity (CEC) was also determined. Mineralogical analysis by XRD revealed the presence of muscovite (29.7%), kaolinite (8.9%), anatase (2.4%) and quartz (58.9%). The characterization of the organo-clay by infrared and by thermogravimetric analysis confirmed the intercalation of DMSO by the presence of vibration bands at 1008 cm^-1 and 1070 cm^-1 and a strong increase in the loss of mass. The cation exchange capacity of the raw material is 7.4 meq/100g. Rapid adsorption of Pb²⁺ ions was observed between 5 and 15 minutes of stirring time in both cases (raw clay and organomodified clay). The modeling of the isotherms by the models of Langmuir and Freudlich showed that these are of type S with a maximum amount of adsorption of 22.471 mg/g for the fine fraction and 41.493 mg/g for the clay intercalated with DMSO. Langmuir’s model best reproduces the experimental data of this study.

关 键 词：Clay DIMETHYLSULFOXIDE ORGANOCLAY CHARACTERIZATION ADSORPTION ISOTHERM Moukosso 

分 类 号：O64[理学—物理化学]