Abstract
This study focused on the carboxylation method on multiwalled carbon nanotube (MWCNT) structure and property. The applicability of a novel adsorbent, the SA/MWCNT-CTS composite were obtained by controlling the reaction conditions. The SA/MWCNT-CTS composite was applied to the absorption of methyl orange (MO) from simulated dye wastewater .Adsorption dynamics and thermodynamics of SA/MWCNT-CTS microspheres were examined by UV-visible spectroscopy, and the associated adsorption mechanism was preliminarily investigated. Changes in the absorbance, throw ratio, conductivity, and the pH value of MO solution of MO solution during adsorption by SA/MWCNT-CTS microspheres were also studied. Results showed that the prepared SA/MWCNT-CTS microspheres retained excellent inherent chemical stability and had strong MO adsorption capacity. CS contains many hydroxyl groups, which are involved in the adsorption of organic dye. The adsorption process had a negative value of free energy change (∆G0); therefore, the process was a spontaneous reaction. At lower MO equilibrium concentrations, the SA/MWCNT-CTS microspheres had a greater capacity for adsorption.
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