Abstract
The adsorption of methyl orange (MO) onto hydroxyl-aluminum and cetyltrimethyl ammonium bromide (CTAB)-modified bentonite (Al/CTAB-bent) was studied. The effects of contact time, Al/CTAB-bent dosage, temperature, initial pH and an initial MO concentration on MO adsorption were investigated. The surface properties and structure of Al/CTAB-bent were measured by some techniques, such as X-ray diffraction, scanning electron microscope, Brunauer–Emmett–Teller, energy dispersive X-ray spectroscopy and Fourier transform infrared spectrometry. The color and chemical oxygen demand removal efficiency can reach up to 99% and 97%, respectively. The adsorption kinetics and isotherm of MO onto Al/CTAB-bent were also investigated. The results revealed that Langmuir model was more suitable to describe MO adsorption than Freundlich model. The adsorption kinetics follows the pseudo-second-order kinetics model better. The thermodynamic parameters such as ΔG0, ΔH0, and ΔS0 were also evaluated.
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