Valorization of Oued Sebou Natural Sediments (Fez-Morocco Area) as Adsorbent of Methylene Blue Dye: Kinetic and Thermodynamic Study

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.

The importance of organic carbon as a coadjutant in the transport of pollutants

“…Among them, adsorption is of particular importance. It constitutes a key role in the association between sediment and metals (Galunin et al 2014), dyes (Dra et al 2020), and herbicides (Hu et al 2021), for instance. In the aquatic system, after particle reorganization and the formation of particle-pollutant complexes, the system will be prone to sedimentation or resuspension.…”

“…Alterations in the water pH interfere with surficial characteristics of the sediment, altering the functional groups and hence modifying the adsorption processes. The ideal pH for the formation of stable complexes is dependent on the target pollutant and is deeply related to the amount of oxygen available and the pH pzc of the sediment (Dra et al 2020;Hu et al 2021). Moreover, when anoxic environments are of concern, it has been observed an increased release of Fe and Mg oxides from the sediment to the water column, which results in a higher likelihood of linkage between these metals and DOC (Xie et al 2015).…”

New BaTi0.96Cu0.02X0.02O3 (X = V, Nb) Photocatalysts for Dyes Effluent Remediation: Broad Visible Light Response

“…Human, animals, plants and aquatic life need a clean environment and pure water supply. Many industrial activities discharge large quantities of organic dyes pollutants into water resources [1,2]. These dyes are non-biodegradable, very hazardous and carcinogenic and can cause harm to all organisms even at low concentrations [3].…”

Valorization of Date Pits as an Effective Biosorbent for Remazol Brilliant Blue Adsorption from Aqueous Solution

“…Allowing easy removal of dyes from aqueous solutions over different materials and on activated carbon in particular [32] has always been the subject of much work [33,34]. Many adsorbents have been investigated for the removal of dyes in recent years [35] such as clay [36,37], layered double hydroxides [38], metal oxides [39], goethite modified natural [40], and sediments [41,42].…”