Abstract
In this work, the results of kinetic studies of Pd(II) chloride complex ion adsorption process on activated carbon are presented. The experiments were conducted for different temperatures, initial concentrations of Pd(II) complex ions as well as for different amount of activated carbon. These results confirmed that the mechanism of the adsorption process is complex and can be described by two step reaction model. A new form of the adsorption isotherm based on kinetic mechanism is suggested and can describe the observed process. Moreover, it was shown that for specific conditions, the proposed isotherm can be transformed into the Freundlich’s isotherm. The activation energies of the subsequent stages of the studied process were determined and are equal to E1 = − 9 ± 9, E2 = − 6 ± 1.4 and E3 = − 85 ± 8.9 J mol−1, respectively. It is also suggested that the observed positive Gibbs energy change during adsorption can be related only to the first step of this process which does not lead to the final product.
Highlights
At present, activated carbon is often applied to the heavy metals ions removal form the aqueous solutions
We found that Freundlich adsorption isotherm describes the adsorption of Pd(II) complex ions much better Langmuir equation
Model was fitted to the obtained kinetic curve, and respective parameters related to the process were derived
Summary
At present, activated carbon is often applied to the heavy metals ions removal form the aqueous solutions. Our work refers to the first area mentioned above. The process of Pd(II) chloride complex ions adsorption on activated carbon was described in our previous paper [18]. In the case of acidic solutions containing chloride ions, palladium forms chloride complexes. There are several reports which indicate that during the adsorption process on activated carbon, palladium(II) is reduced to the metallic form [5, 6, 9, 11]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
