Exploring Methylene Blue Adsorption: Isotherm and Kinetics on a Thermally Treated Sediment

Résumé

Durable (MEEAD'2024) Jijel, Algérie.ID 139-1 1. Preparation of the sediment:1-The sediment was collected from Guénitra Dam (Skikda) and dried in an oven at 80°C for 24 hours.2-The dried sediment was ground using an agate mortar and sieved through a 250 µm mesh.3-Calcination was performed at 500°C for 2 hours in a furnace to activate the adsorbent properties of the sediment. Experimental Procedure:1-Adsorption Experiments:250 mL of methylene blue (MB) solution (concentration: 8 mg/L) was prepared for each experiment.2-The effect of contact time,sediment mass,pH and stirring speed were studied 3-Samples were taken each 5min ,then they were centrifuged for 10 minutes, and the supernatants were analyzed using UV-Visible spectrophotometry at 665 nm. Measurement and Analysis:1-The adsorption capacity and removal efficiency were calculated using the initial and equilibrium concentrations.2-Kinetic models (pseudo-first-order, pseudo-second-order) and isotherm models (Langmuir, Freundlich, Temkin) were applied to analyze the data Methylene blue (MB) is a cationic dye commonly used as a pollutant model.This study focuses on the removal of MB using asediment from Guénitra Dam, Skikda, calcinated at 500°C.The objective is to evaluate the adsorption capacity of the sediment under different experimental conditions (mass, pH, contact time, stirring speed).Persistent organic pollutants (POPs), including synthetic dyes, pose significant environmental challenges due to their non-biodegradable nature.This study focuses on removing methylene blue, a synthetic dye, from aqueous solutions using thermally treated sediment from the Guénitra dam in Skikda.The sediment, treated at 500°C, was tested for adsorption efficiency.Key parameters studied included sediment mass, equilibrium time, solution pH, and agitation speed.Optimal conditions were found to be 3g of sediment, 20 minutes of contact time, 50 rpm agitation speed, and a pH of 6.The adsorption was characterized using Langmuir, Freundlich, and Temkin isotherms, all showing strong correlations.Kinetic analysis indicated that the pseudo-second-order model best described the adsorption process.

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