Abstract
In this work, an efficient adsorption system for the removal of bromothymol blue (BTB) from an aqueous solution using oxidized multiwalled carbon nanotubes (MWCNTs-COOH) has been described. The influence of effective variables such as solution pH, contact time, initial BTB concentration, amount of MWCNTs-COOH, and temperature on the adsorption efficiency in batch system was examined while BTB content was determined via UV-Vis spectrophotometer. Among different kinetic models (pseudo-first-order, pseudo-second-order, intra-particle diffusion, and Elovich model), experimental data of the removal process well fitted with the pseudo-second-order kinetic model with a high correlation coefficient. Evaluating the fitness of experimental equilibrium data by various conventional isotherm models including the Langmuir, Freundlich, and Tempkin models (based on considering R 2 value as criterion) show the applicability of the Langmuir model for the interpretation of experimental data with a maximum adsorption capacity of 55 mg g−1 of adsorbent. Thermodynamic parameters (Gibb's free energy, entropy and enthalpy) of adsorption show that the adsorption process has endothermic nature.
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