The overall goal of this study is to characterize and to evaluate the potential uses of clay mined in the Nzaou locality. The Mou sample is argillaceous texture and medium plasticity (Ip = 28.9). Kaolinite is dominant clay species (44.41%). It is associated with illite (9%). Quartz and rutile are the main non clay minerals. The CEC is 8.66 cmol+/kg. Organic matter is low (0.839%). Total shrinkage obtained by dilatometry at 1200˚C is 9.26%. The chemical and mineralogical compositions have allowed using the ternary diagrams of Fabbri and Fiori that the MOU clay is favorable for glazed white stoneware (GWS) and for the production of clinker (KLK). Dondi typologies of ceramic tiles according to body color (mostly depending on the iron oxide content) and compactness (expressed by water absorption) have confirmed the use for the manufacture of the GWS and clinker. Classification always according to Dondi taking into account the rate of kaolinite, the fine fraction (<2 µm) and plasticity index gives MOU clay to be considered as medium ball clays (BC1). The absorption rate indicates that the body fired at 1200˚C will be vitrified. Flexural strength at 1200˚C (16 MPa) does not correspond to the requirements of GWS or a clinker.
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 Pb 2+ 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.
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