Banca de DEFESA: NAJARA SANTANA PITA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : NAJARA SANTANA PITA
DATE: 04/07/2023
TIME: 14:00
LOCAL: Sala de Seminários do Instituto de Química - UFBA
TITLE:

Study of the action of TiO₂-based photocatalysts supported on sewage sludge for the removal of pollutants from river water

 

KEY WORDS:

Heterogeneous photocatalysis;  sewage sludge;  TiO2; water treatment

PAGES: 50
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Inorgânica
SUMMARY:

Environmental pollution is a great worry in the whole world, among the affected environments, the rivers stand out as impacted by anthropogenic activities – in urbanized areas, they have a large pollution load. Another critical issue that stands out is the need for safe disposal of domestic sewage sludge – a byproduct created by the Wastewater Treatment Plant (WWTP). In this work, TiO₂ nanoparticles were developed being used as support for sewage sludge. These nanoparticles have already been widely studied in the last decades in advanced oxidative processes for environmental decontamination, being supported in treated sewage sludge. Heterogeneous photocatalysis based on semiconductors, such as TiO_2, occurs by photoactivation of the semiconductor particles with UV radiation, generating species highly oxidizing. Since the photoactivity of the material is highly dependent on its morphological and microstructural properties, alterations were also held in this material for the addition of transition metal, using Pt⁴⁺ e W⁶⁺ ions, by Pechini Method. Semiconductors were characterized by X-ray diffraction (XRD) and diffuse reflectance (DRIFT). These studies allowed us to relate the photoactivity of the synthesizes materials with their optical characteristics. These materials photocatalytic activity was screened in front of a model compound (methylene blue) and, subsequently, they were used in the study of the removal of pollutants in river water real samples. In these trials were investigated the parameters COD, phosphorus, nitrogen, and coliforms. The results obtained of the discoloration of the solution of the model compound using the TiO₂ composites were considerably good – reaching, in some composites values higher than 80%. The composites also showed promise in the removal of some pollutants present in actual samples.

COMMITTEE MEMBERS:
Interna - 1488945 - ADRIANE VIANA DO ROSARIO
Interno - 2356272 - ARTUR JOSE SANTOS MASCARENHAS
Interno - 2362069 - RAILDO ALVES FIUZA JUNIOR