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Author: search.filters.author.Nadjemi, B.Subject: search.filters.subject.Methylene blue

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    Removal of methylene blue in aqueous solution by oxidation with hydrogen peroxide in presence of copper-impregnated activated alumina
    (Aljest, 2019) Bousalah, Djedjiga; Yeddou, A. R.; Hachemi, M.; Nadjemi, B.
    In this work, methylene blue in aqueous solution is removed by oxidation with hydrogen peroxide in the presence of copper impregnated activated alumina. After preparation and characterization of the catalyst, the catalytic oxidation tests are performed. The effects of pH, H2O2 concentration, catalyst dose, and temperature have been investigated. The tests show that adding activated alumina increases significatively the degradation effeciency of methylene blue. The reuse of catalyst for four cycls shows a good catalytic stability. The elevation of the temperature affects positively the kinetics of degradation. The acidified medium increases the decolorization efficiency of dye.
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    Removal in batch mode experiment of Methylene Blue onto trimming Wood of Orange Tree –Equilibrium and Kinetics Studies –
    (ALJEST, 2018) Sifoun, Naima; Abbas, Moussa; Yeddou, A. R.; Nouri, L.; Nadjemi, B.
    In the present study, adsorption of Methylene Blue (MB) from aqueous solution was investigated using an adsorbent derived from Trimming Wood of Orange Tree (WOT). The used adsorbent was analyzed using FT-IR and SEM techniques.The adsorption of MB was carried out using a batch system and the effects of adsorbent dose, initial pH, ionic strength, contact time, initial concentration and temperature on the adsorption capacity of adsorbent were investigated. Kinetic parameters, rate constants, equilibrium adsorption capacities and determination coefficients, for each kinetic equation were calculated and discussed. It was shown that the adsorption of MB onto WOT could be described by the pseudo-second order kinetic. The experimental isotherm data were analyzed using the Langmuir, Freundlich and Temkin models. Adsorption of MB onto WOT followed the Langmuir isotherm for all temperatures studied and the maximum MB uptake was observed as 48.78 mg/g at 293 K. The evaluation of thermodynamics parameters such as the negative Gibbsfree energy and negative enthalpy change indicated respectively the spontaneous and exothermic nature of thesorptionprocess