Thermodynamic study of Egg white albumin adsorption on charcoal derived from peach Nuclei and walnut shell

Abstract

In this study , the efficiency of waste charcoal derived from walnut shell and
peach Nuclei from synthetic wastewater(EWA) has been studied . Batch adsorption
experiments were carried out as a function of pH , adsorbent mass, EWA
concentration, contact time and temperature .
The pH of each solution was not controlled , this is because the net interaction
between the adsorbent and EWA could be disturbed by the buffer solution , therefore ,
the experiments were carried out in a pH 2 to 4 . These experiments were done under
room temperature and showed that the optimum weight of charcoal derived from
Walnut shell was 0.2gm , equilibrium time was 60min. , removal % (86.2) and Kd
(86.2) , While optimum weight of charcoal derived from peach Nuclei was 0.05gm ,
equilibrium time was 120min. , removal % was( 34.5 ) and Kd( 138).
Thermodynamic parameters such as ΔH , ΔG , ΔS , were calculated . The
adsorption process on charcoal derived from peach Nuclei was endothermic, while
exothermic on charcoal derived from Walnut shell, the results were analyzed by the
Langmiur and Freundlich equation .