Page | 881 Received: 20 September 2021 Revised: 23 October 2021 Accepted: 29 October 2021 DOI: 10.22034/ecc.2021.305858.1240 Eurasian Chem. Commun. 3 (2021) 881-892 http:/echemcom.com FULL PAPER Efficient adsorbent based on bentonite functionalized with 3- aminopropyltriethoxysilane for dyes removal from aqueous solutions Mazouri Belhadri a,b, * |Adel Mokhtar a |Abdelkader Bengueddach a |Mohamed Sassi a a Laboratoire de Chimie des Matériaux L.C.M, Département de Chimie, Faculté des Sciences Exactes et Appliquées, Université d’Oran1 Ahmed Ben bella, BP 1524, El-Mnaouer, 31000 Oran, Algeria b Laboratoire de Rhéologie, Transport des fluides complexes, Département d’Hydraulique, Faculté d’Architecture et Génie Civil, Université des Sciences et de la Technologie Mohamed Boudiaf, BP 1505 El-Mnaouer, 31000 Oran. Algerie *Corresponding Author: Mazouri Belhadri Tel.: +213664595006 The present work focuses on intercalating a natural bentonite with an organo-inorganic specieobtained by hydrolysis of 3- aminopropyltrimethoxysilane in order to improve its adsorption capacity. The material obtained is used in the deppolution of water polluted by dyes. Methylene blue is chosen as a model pollutant. In order to be able to characterize this clay after modification, we used several physico-chemical and mineralogical analysis techniques such as X-ray diffraction, infrared spectroscopy, chemical and thermal analysis. The cationic exchange capacity was determined as well. In addition, with a view to optimization, the effects of several adsorption factors, including time, pH, dye concentration, and masse of clay on the adsorption capacity of methylene blue by the adsorbent were assessed as well. The results of this study showed that Langmuir isotherm is the model which best characterized the adsorption of methylene blue by the developed adsorbent (Bent-APTES) with a capacity of 217.40 mg g -1 .Accordingly, the modified Algerian bentonite may be utilized as a potential adsorbent for the treatment of waste effluents polluted by cationic dyes from wastewaters. KEYWORDS Bentonite; 3-aminopropyltrimethoxysilane; adsorption; methylene blue. Introduction Attention to the environment and its issues in recent years has been the focus of many researchers in various fields [1-4]. It is widely admitted that over the last few decades, the development of human society has been growing rapidly, leading to the use of a large number of hazardous dyes that are considered as the most worrying sources of pollution [5]. No one denies that the presence of dyes in water, even at low concentrations, is highly poisonous to all living creatures and ecosystems [6,7]. It is worth indicating that methylene blue (MB) is a water-soluble cationic dye with high chromaticity; it is extensively utilized as a chemical indicator, bacteriologic stain, biological stain, coloring agent, and the like. In this context, Russoet al. [8] found out that methylene blue (MB) is quite visible and stable in water at room temperature. In addition, as this synthetic dye is extensively employed in various areas, including paper, food processing, plastics, printing and others, which are closely associated with our daily life, it has become extremely urgent to develop efficient ways to remove this dye