Dynamic adsorption behavior and mechanism of Cefotaxime, Cefradine and Cefazolin antibiotics on CdS-MWCNT nanocomposites

Normative batch adsorption studies of Cefotaxime, Ceftadine and Cefazolin onto the developed CdS-MWCNT nanocomposites were well elucidated and investigated. The whole experimentation was carried out as a function of several influential parameters such as adsorbent dose, pH, contact time, and temperature. The developed adsorbent i.e. CdS-MWCNT nanocomposites were found to have high specific surface area and prodigious adsorption capacity. Several adsorption isotherm models such as Freundlich, Langmuir, Temkin and Scatchard were applied for the examination of equilibrium data, but Langmuir isotherm was found to be well fitted and in good agreement with the equilibrium data. One of the key finding is that the adsorption capacity increases on increasing pH and decreasing temperature. Thermodynamic parameters such as Gibbs free energy, enthalpy and entropy were calculated, the analysis showed negative values of Delta G, which reveals the spontaneous nature, negative values of Delta H reveals the exothermic nature as well as physical nature of adsorption, additionally negative values of Delta S reveals the decreased disturbance interface of Cefotaxime, Cefradine and Cefazolin removal using CdS-MWCNT nanocomposites. (C) 2015 Elsevier B.V. All rights reserved.