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• W2131412912 abstract "The aim of the present study is to enhance the methylene blue (MB) adsorption of sepiolite by ultrasonic treatment. The natural sepiolite was pretreated by sonication to improve the surface characteristics and enhance the dye uptake capacity. Sonication process resulted in a significant increase in the specific surface area (SSA) of sepiolite. The FTIR spectrum of the sonicated sepiolite indicates that the tetrahedral sheet is probably distorted after sonication process. The effect of various parameters such as sonication, pH, initial dye concentration and temperature on dye adsorption has been investigated. The adsorbed amount of MB on sepiolite increased after sonication as well as with increasing pH and temperature. The experimental data were evaluated by applying the pseudo-first- and second-order, and the intraparticle diffusion adsorption kinetic models. Adsorption process of MB onto sepiolite followed the pseudo-second-order rate expression. The experimental data were analyzed by Langmuir and Freundlich isotherms, and found that the isotherm data were reasonably well correlated by Langmuir isotherm. Maximum monolayer adsorption capacity of sepiolite for MB increased from 79.37 to 128.21 mg/g after the sonication. Various thermodynamic parameters, such as Delta G(0), Delta H(0) and DeltaS(0) were calculated. The thermodynamics of MB/sepiolite system indicated spontaneous and endothermic nature of the process. Adsorption measurements showed that the process was very fast and physical in nature." @default.
• W2131412912 created "2016-06-24" @default.
• W2131412912 creator A5003462658 @default.
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• W2131412912 date "2010-01-01" @default.
• W2131412912 modified "2023-10-18" @default.
• W2131412912 title "Adsorption of methylene blue onto sonicated sepiolite from aqueous solutions" @default.
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• W2131412912 doi "https://doi.org/10.1016/j.ultsonch.2009.05.012" @default.
• W2131412912 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19505836" @default.
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