Banca de DEFESA: NAOMI AKIBA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : NAOMI AKIBA
DATA : 24/02/2021
HORA: 14:00
LOCAL: Campus Santo André
TÍTULO:

Evaluation and application of Kraft lignin in the removal of potentially toxic metals

PÁGINAS: 121
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
RESUMO:

In the last decades, in addition to anthropogenic activities such as electroplating, tanning, the textile industry, fertilizers, pesticides and mining, another pollution problem that has been growing worldwide is electronic waste, which contains persistent organic pollutants, potentially toxic metals and noble metals. Thus, waste treatment is necessary before disposal. Among the various techniques that are available for the treatment of waste, adsorption is a simple alternative, with wide applicability, economic viability, availability of adsorbent materials and simple design. The lignin is a polymer with a variety of functional groups. It is offering different possibilities of use, among them, studies related to its adsorption properties for different types of pollutants such as metals potentially toxic, organic dyes and pesticides. From the lignin in natura, the adsorption of 10 metallic elements between potentially toxic and noble metals was studied. The variables that influence the adsorption processes were evaluated. The experimental data were applied to kinetic models (pseudo-first order, pseudo-second and intra-particle diffusion) and adsorption isotherm models (Langmuir, Freundlich and Dubinin-Radushkevich). From these studies, there was a high affinity of the gold (III) and palladium (VI) ions for lignin in nature. Thus, was studied selectivity of lignin for gold and palladium in an acid medium. Finally, the study of the use of lignin in nature as a support for the catalyst was carried out, impregnating palladium. This catalyst was utilized in the Suzuki-Miyaura reaction, presenting similar initial results when compared to the commercial catalyst. The adsorption study was also carried out with acetylated lignin and charcoal. Both materials became insoluble in an aqueous medium, but there was a decrease in the adsorption capacity. From all these studies, lignin proved to be a versatile adsorbent . In addition to its environmental potential for remediation, lignin allows the recovery of metals. It is also promising to be used as a support for heterogeneous catalysis. This scenario offers a real opportunity for the sustainable use of lignin in different areas. It being possible closes the cycle of using lignin for the development of a circular economy.

 

MEMBROS DA BANCA:
Presidente - Interno ao Programa - 1543683 - IVANISE GAUBEUR
Membro Titular - Examinador(a) Interno ao Programa - 1601156 - WAGNER ALVES CARVALHO
Membro Titular - Examinador(a) Interno ao Programa - 1600860 - ALVARO TAKEO OMORI
Membro Titular - Examinador(a) Externo ao Programa - 1961116 - DEMETRIO JACKSON DOS SANTOS
Membro Titular - Examinador(a) Externo à Instituição - PAULETE ROMOFF
Membro Suplente - Examinador(a) Interno ao Programa - 1544394 - PAULA HOMEM DE MELLO
Membro Suplente - Examinador(a) Externo ao Programa - 1548095 - PATRICIA DANTONI
Membro Suplente - Examinador(a) Externo à Instituição - MARCIA GUEKEZIAN