Nombre: WILLBRYNNER PEREIRA MARQUES
Tipo: MSc dissertation
Fecha de publicación: 31/03/2020
Supervisor:
Nombre |
Rol |
|---|---|
| EDUARDO PERINI MUNIZ | Advisor * |
| PAULO SÉRGIO DA SILVA PORTO | Co-advisor * |
Junta de examinadores:
| Nombre |
Rol |
|---|---|
| EDUARDO PERINI MUNIZ | Advisor * |
| JOSÉ RAFAEL CÁPUA PROVETI | Internal Examiner * |
| PAULO SÉRGIO DA SILVA PORTO | Co advisor * |
| RENATO DO NASCIMENTO SIQUEIRA | External Examiner * |
Resumen: In this study, a system was developed to capture magnetic particles synthesized by the Sol-Gel
method. These particles were also used to remove boron in synthetic samples. The magnetic
materials consist of: nickel ferrite composite (comp-Ni), cobalt ferrite composite (comp-Co), and
pure cobalt ferrite (FCo). These materials were characterized by X-Ray Diffraction (XRD) and
Fourier Transform Infrared Spectroscopy (FTIR) techniques. In the comp-Co experimental
planning, it was evaluated how the suspension concentration and the residence time in the reactor
influence the efficiency of capture of adsorbent material (ECMA). For this, the suspension
concentrations and residence time used are in the range of 1.3333-12.0000 g.L-1 and 0.5-1 min,
respectively. Both factors are significant in the magnetic separation process. By keeping the
residence time constant, there is a concentration at which the ECMA is maximum so that in higher
concentrations the system tends to be more inefficient. For constant concentration, ECMA
increases with residence time. ECMA for comp-Ni and FCo was determined for a concentration
of 9.26 g.L-1 and residence time in the range of 0.5-1 min. The substitution of 75% FCo for MgO
to form the comp-Co the ability of CSM to capture this material decreases. Comparing the ECMA
of the comp-Co and the comp-Ni, there was little divergence between the results, a reduction of
ECMA less than 5% for comp-Ni was observed. On the other hand, when it comes to removing
boron, comp-Ni removed about 12% more than comp-Co. The adsorption experiment was carried
out with synthetic effluent containing 6 ppm of boron which was kept in agitation (750 rpm) for
48 h with 9.26 g.L-1 of adsorbent material (comp-Co and comp Ni). After the adsorption process
with comp-Ni, it was possible to reach a useful concentration for irrigation, below 2.5 ppm,
