Banca de QUALIFICAÇÃO: NOELLE CARDOSO ZANINI

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : NOELLE CARDOSO ZANINI
DATA : 13/06/2022
HORA: 14:00
LOCAL: On-line
TÍTULO:

 

Biodegradable adsorbent membranes to retain copper from contaminated effluents

PÁGINAS: 134
GRANDE ÁREA: Outra
ÁREA: Multidisciplinar
RESUMO:

 

Industrial effluents discharged without treatment, resulting from urbanization, associated with environmental disasters of high magnitude, as occurred in mining dams in Brazilian cities, are sources of potentially toxic elements (PTEs) in waterways; in these, organisms that come into contact with polluted water can suffer negative consequences due to the toxicity of metal ions, such as bivalent copper cations (Cu(II)). In this scenario, alternatives to retain and recover PTEs in contaminated water through the use of biodegradable porous materials that do not cause further harm to health and the environment are urgently needed. Membranes with double filtering-adsorption action are configured as an interesting and intelligent route for such purpose, due to the exclusion principle caused by the filter pores together with the functionalization by adsorbent nanomaterials that interact with the toxic metal ions in high concentrations. In view of the mentioned facts, this work proposed to obtain and characterize adsorbent membranes of biodegradable matrix of poly(butylene adipate co-terephthalate) (PBAT) combined with nano clay Cloisite® 20A (C20A) and nanometric curcumin (Cur) to enhance Cu(II) retention. Ball milling was used as a top-down method to obtain the curcumin nanoparticles. Dynamic light scattering and X-ray diffraction analyses were performed on Cloisite® 20A (C20A) and the nanometer curcumin (Cur). A combination of evaporation-induced phase inversion and non-solvent immersion (EIPS/NIPS) as well as dip coating approach was used to assemble the membranes. The obtained membranes were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), mechanical testing and contact angle (CA). DLS corroborated the nanometric nature of the C20A and Cur particles, and XRD showed that ball milling causes an amorphization of Cur. FTIR demonstrated functional groups that may favor Cu(II) adsorption to the composite membranes, and deconvolution of the curves of the EIPS/NIPS membranes showed higher hydrogen bonding coefficients (FH-CO) compared to dip coating and equal to that of pure PBAT. The contact angle showed that the composite membranes have hydrophilic characteristic, which may favor the interaction with the liquid contaminated with the analysis ion.  

MEMBROS DA BANCA:
Presidente - Interno ao Programa - 1309493 - PEDRO ALVES DA SILVA AUTRETO
Membro Titular - Examinador(a) Interno ao Programa - 1761120 - DANILO JUSTINO CARASTAN
Membro Titular - Examinador(a) Externo à Instituição - LUCIA HELENA INNOCENTINI MEI - UNICAMP
Membro Suplente - Examinador(a) Interno ao Programa - 1760410 - JEVERSON TEODORO ARANTES JUNIOR
Membro Suplente - Examinador(a) Interno ao Programa - 1676364 - JULIANA MARCHI
Membro Suplente - Examinador(a) Externo à Instituição - ALEXANDRE TADEU PAULINO - UDESC