Banca de DEFESA: BRUNA MARIA PATERLINE NOVAIS ABREU

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : BRUNA MARIA PATERLINE NOVAIS ABREU
DATE: 27/07/2021
TIME: 16:30
LOCAL: https://meet.google.com/ozx-teat-dyi
TITLE:

USE OF MODIFIED SYNTHETIC CLAYS OF THE HYDROTALCITE TYPE (FeMgAl, CuMgAl, CuFe) FOR THE REMOVAL OF SODIUM DICHLOPHENAC IN AQUEOUS MEDIUM

KEY WORDS:

adsorption, hydrotalcite, sodium diclofenac.

PAGES: 59
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

This study has as its main goal to evaluate the adsorbing capacity of the hydrotalcite like synthetic clays modified with Cu and Fe (CuFe, CuMgAl, FeMgAl), calcinated in different temperatures (300, 400 and 500ºC), removing the drug Sodium Diclofenate (SD) diluted on aqueous mean. The adsorbing materials were synthetized by the coprecipitation and the coprecipitation at low supersaturation methods and they were characterized by the following techniques: X-ray diffractometry (XRD), which confirmed the formation of the hydrotalcites structure, presenting peaks characteristics of the material and suggested the incorporation of the metals of transition Cu and Fe within the structure of the sample; Nitrogen physisorption (BET method) which provided the superficial area, the average pore size (7,99nm) and larger total volume of pores of FeMgAl300 (48,08 cm³g⁻¹); and ph at the point of zero charge (PZC), used to foresee the effective superficial charge of the samples, resulting in pH of 7,0, 8,59 and 8,56 for CuFe, CuMgAl and FeMgAl, respectively. The time of contact and the effect of the temperature of calcination on the adsorption for the removal of SD were evaluated. It was observed that the adsorption process with the CuFe clay reaches balance at approximately 30 min, removing 75-80% compared to the non-calcinated sample; the pseudo-second order model was the most adequate describing the adsorption process, generating a R2 coefficient close to the unity, having qe=40,72mgg⁻¹, qe(real)=40,94 mgg⁻¹ and K2=0,033gmg⁻¹min⁻¹. The study of the adsorption isotherm was performed for the CuFe sample, due to its high adsorption rate, it was concluded that the Freudlinch model was the most adequate describing the process. The CuMgAl and FeMgAl hydrotalcites appeared to be inefficient, having percentages of removal of 2-7,5% and 6-10% respectively. It was also observed that the temperature of calcination and the variation of the initial pH did not influence the percentual of removal of the SD.

BANKING MEMBERS:
Presidente - 1810291 - DEMIAN PATRICK FABIANO
Interno - 1893854 - ALEXANDRE BOSCARO FRANCA
Externa à Instituição - LETÍCIA LEDO MARCINIUK - UTFPR