The adsorption capabilities of multiwall carbon nanotubes (MWCNTs) for acetic acid have been investigated experimentally and theoretically. Carbon nanotubes (CNTs) are an important new material in the carbon family. Adsorption time required to attain the steady state and influences of quantities of alumina, effects of temperature, and effects of initial values of acetic acid concentrations have been determined experimentally. The most common used adsorption isotherms have been drawn by using experimental results. These are selected as Langmuir, Freundlich, and Temkin. In experimental works, the equilibrium is considerably affected by initial concentration values of acetic acid at various temperatures (278 K, 298 K, 318 K). Langmuir isotherm has been found the best suitable for acetic acid. Also kinetic models for adsorption such as Elovich and pseudo-first and -second orders have been used. The equilibrium results fit well within the Elovich model and while the pseudo-second order model is a good representation of the adsorption, the pseudo-first order approach does not fit with experimental data. The model parameters have been calculated.

Oxalic acid adsorption from aqueous solution studied in this work. Multi-walled carbon nanotubes (MWCNT) were used as an adsorbent. The investigated adsorption variables are equilibrium time, initial acid concentration, and temperature. The experimental results were presented using equilibrium isotherm and kinetic models. The used equilibrium models are Langmuir, Freundlich, and Temkin adsorption isotherms. And the kinetic models are Elovich, Lagergren pseudo first-order and pseudo second-order kinetic models. The thermodynamics studies were carried out at three different temperatures.These values are 278, 298 and 318 K. Langmuir isotherm was the best fitted equilibrium model for the experimental data. The all applied kinetic models were fitted the data, suitably. Graphical Abstract: Downloaded by [University of Bath] at 01:50 22 June 2016 2