Banca de DEFESA: MARCIO DE JESUS SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : MARCIO DE JESUS SILVA
DATA : 30/09/2019
HORA: 14:00
LOCAL: Auditório Professora Yeda de Andrade Ferreira do Instituto de Geociências da Univ. Federal da Bahia
TÍTULO:

Heterogeneous photocatalysis with TiO2 and Fe-TiO2 and photolysis of aromatic polycyclic hydrocarbons on mangrove sediment. 

PALAVRAS-CHAVES:

Heterogeneous Photocatalysis, Complete Factorial Design, Multiple Response, Wet Impregnation, Sediment, Crude Oil.

PÁGINAS: 109
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Geociências
SUBÁREA: Geologia
ESPECIALIDADE: Geoquímica
RESUMO:

The inclusion of recalcitrant organic pollutants such as polycyclic aromatic hydrocarbons (PAHs) from petrochemical industries in the mangrove ecosystem has motivated the development of technologies for the remediation of this environment. These remediation technologies include advanced oxidative processes (AOPs) because of their high efficiency in degrading organic pollutants. AOPs are based on the formation of chemical species with oxidative power, mainly hydroxyl radicals (● OH). Heterogeneous photocatalysis has been widely used to generate ● OH through a semiconductor with or without modification. In this sense, the objective of this research was to investigate the efficiency of the photocatalytic process using TiO₂ and Fe-TiO₂ in petroleum contaminated sediment samples. To this end, a complete factorial design 2², with a triplicate of the central point, was developed to evaluate the effects of catalyst mass and HPA photodegradation time on mangrove sediment. These experiments were performed with a mass of 1g of sediment contaminated with standard HPAs 0.25mg kg-1 solution. Multiple response (MR) was applied in order to establish a simultaneous experimental condition for the photodegradation of analytes (Acenaphthylene (AcNf), Acenaphthene (AcN), Anthracene (AN), Benzo (a) Antracene (BaA), Indene (1, 2,3cd) Pyrene (IP), Dibenzo (ah) Anthracene (DahA)) under study. The percentage of PAHs photodegradation was 40.29 to 95.73%. The MR indicated that the best experimental condition is at the central point. with mass equal to 0.5g and time equal to 12 hours Under these conditions the kinetic parameters were performed and these parameters were in accordance with the data in the literature. The heterogeneous photocatalysis and photolysis processes were applied to a sediment contaminated by standard solution and crude oil under the optimized experimental conditions. The studies were intensified in the aromatic fraction of crude oil. The nonparametric test was used to evaluate the difference between the processes at the 5% significance level were statistically different in the standard solution. However, in the aromatic fraction there was no significant difference between the process. Data modeling of the standard solution indicated that photocatalysis has a higher efficiency for degrading HPAs than photolysis. The efficiency of Fe-TiO2 was evaluated against TiO2 in oils with different characteristics. These characteristics were confirmed by geochemical data and statistical tests. Fe-TiO2 showed higher efficiency compared to TiO2, but the complexity of the oil sample influences the photocatalytic degradation process.

MEMBROS DA BANCA:
Presidente - 268681 - JOIL JOSE CELINO
Interno - 830.631.455-72 - JUCELINO BALBINO DA SILVA JÚNIOR - UFBA
Interno - 1698441 - RENNAN GEOVANNY OLIVEIRA ARAUJO
Externo ao Programa - 284.214.775-87 - CESÁRIO FRANCISCO DAS VIRGENS - UFBA
Externo à Instituição - GILSON BARBOSA DOURADO - UNEB