Banca de DEFESA: ANDREY COSTA DE OLIVEIRA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : ANDREY COSTA DE OLIVEIRA
DATE: 13/09/2023
TIME: 14:30
LOCAL: Auditório do NUPEG
TITLE:

Removal of microplastic in water through microemulsion-treated adsorbents

KEY WORDS:

surfactante; microemulsion; microplastics; adsorption

PAGES: 119
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Analítica
SPECIALTY: Análise de Traços e Química Ambiental
SUMMARY:

The accumulation of plastics in the environment is increasingly becoming a global concern. As part of the UN report of October 2021 and other important organizations, the need to discuss the issue and seek solutions is noticeable. Among the impacts of these materials, microplastics (particles smaller than 5 mm) have been gaining prominence due to their often imperceptible presence in the environment. Because, in the oceans, they are mistaken for food by the fauna and are often not properly removed in wastewater treatment plants (WTP). Thus, this work researched ways to remove this contaminant from effluents. The way studied was through the use of adsorbents treated with surfactants using decantation to separate them. According to the structure of the surfactant and the adsorbents, these could have some interaction with the microplastics, making their extraction possible. Among the surfactants analyzed, the Tween 80 was chosen because, in addition to low toxicity, it presented efficient interaction with plastic, explained by its chemical structure, proven via FTIR analysis. The effluent used in the tests was obtained through the contamination of distilled water by synthetically acquired microplastics. However, they were compared through the FTIR spectrum with real microplastics, taken from the UFRN WTP. Furthermore, five adsorbents were chosen to be treated with microemulsions having Tween 80 as a component: bentonite, diatomite, coconut, sugarcane, and banana peel bagasse. To measure the amount of microplastic that would be extracted, it was necessary to construct a calibration curve. It was done through the FTIR spectrum of different masses of plastic versus the peak area that varied with absorbance. According to the adsorption tests, carried out for each of the five adsorbents with and without treatment and with the aid of the NOAA method to separate the microplastics from the adsorbents after removal, it was found that the banana peel bagasse presented the highest efficiency among the untreated adsorbents: 70%. Among treated products, sugarcane bagasse had almost 80% of plastic removed. Therefore, it is observed that adsorption can be a viable method for the removal of microplastics in water.

COMMITTEE MEMBERS:
Interno - 1198847 - JOSE LUIS CARDOZO FONSECA
Externo à Instituição - JOSÉ RIBEIRO DOS SANTOS JÚNIOR - UFPI
Externa à Instituição - MARIA CARLENISE PAIVA DE ALENCAR MOURA - UFRN
Externa à Instituição - TAMYRIS THAISE COSTA DE SOUZA - UNIFESSPA
Presidente - 347057 - TEREZA NEUMA DE CASTRO DANTAS