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Synthesis of an inorgano-clay complex from Loukolela clay and application in the adsorption of humic matter

Author Affiliations

  • 1Laboratoire de Chimie minérale et Appliquée, Faculté des Sciences et Techniques, Brazzaville, Congo
  • 2Laboratoire de Chimie minérale et Appliquée, Faculté des Sciences et Techniques, Brazzaville, Congo and Ecole Normale Supérieure University, Marien Ngouabi B. P. 69, Brazzaville, Congo
  • 3Laboratoire de Chimie minérale et Appliquée, Faculté des Sciences et Techniques, Brazzaville, Congo and Ecole Normale Supérieure University, Marien Ngouabi B. P. 69, Brazzaville, Congo
  • 4Laboratoire de Chimie minérale et Appliquée, Faculté des Sciences et Techniques, Brazzaville, Congo
  • 5Laboratoire de Chimie minérale et Appliquée, Faculté des Sciences et Techniques, Brazzaville, Congo

Int. Res. J. Environment Sci., Volume 8, Issue (3), Pages 12-20, July,22 (2019)

Abstract

To study the possibility of improving the ability to eliminate humic organic matter in water was the main focus of this work. For this, the objects of study were the fine fraction and the raw clay. Extraction of the fine fraction was carried out by the sedimentation technique either with prior treatment with oxalic acid to remove the iron oxides or without treatment. The particle size distribution of fine fraction obtained was achieved using laser granulometer. The adsorption capacity is determined using spectrophotometric measurements. The adsorption kinetics gave a necessary contact time to reach the equilibrium of 5 hours with the raw clay and 2h30min for the fraction fine with high removal efficiencies. The fine fraction was firstly made sodium and then the intercalation of an iron-based polycation in montmorillonite was carried out. Adsorption isotherms were obtained on the raw clay, the clay rendered sodic and on the intercalated clay. Isotherms modeling used the Langmuir and Freundlich models. The correlation coefficients indicated that these models are in good agreement. The maximum adsorbed quantities according to the Langmuir model indicate a considerable increase of the specific surface area in the intercalated clay, greatly improving the removal efficiencies of the organic matter. The parameter 1 / n allowed to consider that the adsorption is not favorable with the raw clay, whereas it is considered in the case of the intercalated clay.

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