Nombre: LUANA NEGRIS ZANELATO
Tipo: MSc dissertation
Fecha de publicación: 20/02/2018
Supervisor:
Nombre |
Rol |
|---|---|
| MARIA DE FATIMA PEREIRA DOS SANTOS | Co-advisor * |
| MARISTELA DE ARAUJO VICENTE | Advisor * |
Junta de examinadores:
| Nombre |
Rol |
|---|---|
| MARIA DE FATIMA PEREIRA DOS SANTOS | Co advisor * |
| MARISTELA DE ARAUJO VICENTE | Advisor * |
| ROCHELE SOGARI PICOLOTO | External Examiner * |
Resumen: The application of ultrasound in solid-liquid adsorption systems can intensify the process of mass transfer from solution to adsorbent. This work proposes a process based on application of ultrasonic waves for iron removal from water by means of adsorption on ceramic. The influence of temperature, adsorbent mass, initial iron concentration and sonication time on the removal efficiency and adsorption capacity
of iron were conducted in a static system. It was performed the the evaluation of the kinetic and equilibrium model for this process in order to obtain the system adsorptive parameters, such as the equilibrium time, maximum adsorption capacity and the adsorption rate. The process also was applied to a flow system on laboratory scale.
The results to study of static system showed that all variables had significant influence on both efficiency and adsorption capacity of iron.
The iron ion removal efficiency was between 97% to 99%, for the concentration range of 10 to 60 mg.L-1, respectively. The adsorption process was best described by the Langmuir isotherm model and the pseudo second order kinetic model. The maximum adsorption capacity obtained by the Langmui model was 0.50 mg.g-1. The value of apparent energy of adsorption obtained from non-linear DubininRadushkevich model, 4.35 kJ.mol-1, suggests physical adsorption as mechanism
main. The results for study with well water sample showed an efficiency of up to 81% in the removal of iron from the samples. It was also observed reduction on barium and manganese concentration, with maximum removal efficiency of 45.5% and 87.9%, respectively. The tests on flow system showed that the presence of ultrasound does not affect the maximum adsorption capacity, but increase speed of
the adsorption reaction, the action of the ultrasound increased the value of velocity constant in 142.1%. It was concluded that the present process reduces the iron load in water sample, in addition to having promising potential for other metals.
