2018/10/28 by M.Chafi, B.Gouricha
Chemistry · Environmental Science · #Adsorption and biosorption for pollutant removal #Biosorption #Dye analysis and toxicity #Isotherms #Kinetics #Microplastics and Plastic Pollution #dye Removal #eggshells #methylene blue #thermodynamics.
paper · doi:10.48317/imist.prsm/morjchem-v7i2.14014
openalex publication_date 2018/10/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/01
In this work, the adsorption of cationic dye Methylene blue (MB) on prepared activated carbons from eggshells treated with NaOH (TES) and eggshells Without Treatment (NTES) as a new and potential biosorbent was investigated. Removal of MB dye from aqueous solutions were studied under laboratory conditions and physicochemical parameters as a function of initial dye concentration, temperature and pH. The removal of BM increased by increasing the initial concentration of the dye, contact time and pH of the solution and also decreased by increasing temperature of the adsorbent. Adsorption were modeled by using the Freundlich and Langmuir to fit equilibrium at different temperatures and the isotherm parameters were calculated to describe the biosorption process; Langmuir model was found suitable for the biosorption of the dye. A Comparison of different kinetic models parameters was evaluated for the pseudo-first-order and the pseudo-second-order model on the removal of MB. The results indicated that the dye process followed the pseudo-second-order kinetics for each dye–adsorbent system. The negative values of thermodynamic parameters ΔH° and ΔG° indicated that the adsorption of MB onto TES and NTES was exothermic and spontaneous process respectively, concerning ΔS° which is also negative, it have showed that disorder in the interface system decreases during the adsorption process. Finally, We have established a good potentiality for the TES and NTES particles to be employed as a low cost adsorbent for the removal of colour and dyes .