Abstract
The objective of this study is to evaluate the efficiency of methylene blue removal using Oued Sebou sediments as an adsorbent. The presence of carboxyl functional group demonstrated by infrared (IR) analysis of the sediment favorized the methylene blue (MB) adsorption. Sediment collected from Oued Sebou could remove the most MB molecules at pH 8. The Freundlich model described suitably the adsorption process. The experimental measured enthalpy (ΔH) and entropy (ΔS°) are 118.1 kJ mol−1 and 395.2 J mol−1 K−1, respectively, indicating that the reaction was endothermic with an increase of randomness at the solid/liquid interface during the adsorption. The kinetics of MB adsorption by sediment were adequately fitted to the pseudo-second-order model. Experimental results showed that the adsorption capacity of the methylene blue dye depends on the solution pH, the initial dye concentration, the adsorbent mass, the sediment particle diameter, and the temperature of the reaction medium. The removal efficiency of the MB molecules reaches 100% after 60 minutes under the optimum conditions.
Highlights
Many industries such as textiles and printing are continuously releasing various pollutants into the hydrosphere, and these pollutants have adverse impacts on the environment and human health [1]. ey can cause eye burns, which result in permanent damage to human and animal’s eyes, its inhalation may give rise to breathing difficulties, and its ingestion through the mouth causes a burning sensation, nausea, vomiting, sweating, and an abundance of cold sweats [2]
X-Ray Diffraction (XRD). e mineralogical characterization of sediments is presented in Figure 1. e obtained diffractogram showed different crystalline phases: muscovite (KAl3Si3O10(OH)2), anhydrite (CaSO4), calcite (CaCO3), hematite (Fe2O3), halite (NaCl), quartz (SiO2), and dolomite (CaMg (CO3)2) [11, 14, 15]
Infrared analysis was used to identify all absorption bands corresponding to the different vibrations of the characteristic bonds of the phases detected by XRD
Summary
Many industries such as textiles and printing are continuously releasing various pollutants into the hydrosphere, and these pollutants have adverse impacts on the environment and human health [1]. ey can cause eye burns, which result in permanent damage to human and animal’s eyes, its inhalation may give rise to breathing difficulties, and its ingestion through the mouth causes a burning sensation, nausea, vomiting, sweating, and an abundance of cold sweats [2]. Ey can cause eye burns, which result in permanent damage to human and animal’s eyes, its inhalation may give rise to breathing difficulties, and its ingestion through the mouth causes a burning sensation, nausea, vomiting, sweating, and an abundance of cold sweats [2]. Many research works have studied the removal of dyes from aqueous solution [3, 4], and the adsorption property of several natural adsorbents was widely studied [4,5,6,7]. According to the bibliography, little effort has been made to study the adsorption of MB by using sediments as an adsorbent. E dye is not toxic in nature, and it causes several harmful effects to the health of living beings, though. Methylene blue can cause increased heartbeat, nausea, and vomiting. Several physical or chemical processes are used to treat dye laden wastewaters such as photodegradation [9]. e sediments are often called “vases”, and we define the constitution as a more or less large set of particles or precipitates which have undergone transport in their individual parts [10]
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