期刊
TOXICOLOGICAL AND ENVIRONMENTAL CHEMISTRY
卷 94, 期 5, 页码 873-883出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/02772248.2012.678999
关键词
adsorption; bromothymol blue; carboxylic derivative multiwalled carbon nanotubes; adsorption isotherm; thermodynamics and kinetics of adsorption
资金
- Graduate School and Research Council of the University of Yasouj
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, intraparticle 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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