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- W1996031933 abstract "Adsorption of anionic dye – Orange II – in aqueous solution onto hexadecyltrimethylammonium bromide (HDTMA)-coated zeolite (HCZ) reached 38.96 mg/g compared with 8.13 mg/g onto natural zeolite. Fourier Transform Infrared (FTIR), scanning electronic microscopy (SEM) and X-ray powder diffraction (XRD) data showed that HDTMA-coated zeolite developed surficial positive charges. The adsorption reaction fits the Freundlich isotherm (R2 = 0.93) and the value of 1/n was less than unity (=0.81) and suggest a multi-layer physi-sorption process. The kinetics of the adsorption is a pseudo-second-order model. The activation energy (Ea) of the reaction is +35.70 kJ/mol to further support a physi-sorption process while the ΔHo (+82.79 kJ/mol) is characteristic for an endothermic reaction. The ΔGo values of −2.33, −0.98 and −0.37 kJ/mol at 25 °C, 30 °C and 35 °C, respectively implied that the adsorption reaction was feasible and thermodynamically spontaneous. We proposed that both electrostatic interactions and partitioning process are involved in the adsorption mechanisms of Orange II dye onto HCZ." @default.
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- W1996031933 date "2014-12-01" @default.
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- W1996031933 title "Adsorption of Orange II dye in aqueous solution onto surfactant-coated zeolite: Characterization, kinetic and thermodynamic studies" @default.
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- W1996031933 doi "https://doi.org/10.1016/j.jcis.2014.08.011" @default.
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