Shakhab Allahgulu Nasseri
Technology of sorption extraction of copper (II) and zine ions from industrial waste waters
The thesis is devoted to studying the sorption of copper (II) and zinc ions from waste waters of ore on bentonite and its modified forms. Systematical researches of adsorption of copper (II) and zinc ions from model waste waters on Na-bentonite were presented. Kinetic laws were defined and thermodynamics of adsorption of abovementioned ions was studied. It was established that studying the kinetics and thermodynamics of adsorption of copper and zinc ions allows us to define perspectives of Na-bentonites in sorption processes for given purposes. At minimum values of thermodynamic parameters high adsorption capacity of Na-bentonite relative to copper (II) and zinc ions is related to selectivity and high rate. It was detected that in adsorption-desorption cycles of copper (II) and zinc ions the values of enthalpy and entropy monotonously decrease and at 3-5 multiple cycles practically remain unchanged. It was established that absorbed copper (II) and zinc ions can be fully desorbed by chloride of sodium solutions with surface of Na-bentonite. By this way optimum mode of desorption process was developed. We used a number of modern physical and chemical techniques for completion of thesis work. Mathematical model was developed and all technological parameters of the processes from laboratorial to industrial scale were calculated. Obtained experimental results were tested on technological plant in Islamic Republic of Iran and the process was recommended for application.