Banca de DEFESA: Nayara dos Santos Oliveira
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.STUDENT : Nayara dos Santos Oliveira
DATE: 03/05/2024
TIME: 14:00
LOCAL: Sala de Informática do PTARH com Transmissão pela Plataforma MS Teams
TITLE:
ABSTRACT REMOVAL OF BISPHENOL S (BPS) BY ADSORPTION ON ACTIVATED CARBONS COMMERCIALIZED IN BRAZIL
KEY WORDS:
adsorption, activated carbon, bisphenol S, bisphenol A.
PAGES: 121
BIG AREA: Engenharias
AREA: Engenharia Sanitária
SUBÁREA: Recursos Hídricos
SUMMARY:
Bisphenols are synthetic phenolic organic compounds widely used as monomers or additives in producing epoxy resins and polycarbonate plastics. Bisphenol S (BPS) has emerged as a substitute for Bisphenol A (BPA); however, it exhibits endocrine-disrupting characteristics similar to BPA. The presence of these compounds in water sources used for public water supply in Brazil poses a challenge to water treatment plants. Therefore, viable technologies that complement conventional water treatment systems are necessary to remove these contaminants. Activated carbon adsorption can be an effective technological option for removing BPS and BPA. This work evaluated three activated carbons (BETM, COCO and SIAL) of vegetable and mineral origin sold in Brazil to analyze each carbon's adsorptive capacity and performance in removing BPS and BPA in an ultrapure water matrix. The adjustments to the kinetic models indicate that the pseudosecond-order model better represented the experimental data. The adjustment of experimental data to the Weber and Morris intraparticle diffusion kinetic model indicates that intraparticle diffusion is the main mechanism of the BPS and BPA adsorption process and the limiting step of the process, influencing the global kinetics of bisphenol adsorption on evaluated activated carbons. The three carbons reached the adsorption equilibrium of BPS and BPA after 2 hours of contact time. The experimental data of adsorption capacity at equilibrium adequately fit the Langmuir isotherm. According to the isotherms, the analyzed carbons were effective in removing Bisphenol S and Bisphenol A. BETM exhibited the highest adsorption capacities (Q0 max) for BPS and BPA, 260.62 and 264.64 mg/g, respectively, followed by SIAL with Q0 max equal to 248.25 mg/g of BPS and 231.20 mg/g of BPA. Finally, COCO was the adsorbent with the lowest adsorption capacity among the carbons evaluated, with Q0 max of 136.51 mg/g BPS and 150.03 mg/g BPA, which represent 52% and 56% of the capacities maximum adsorption of BPS and BPA, respectively, on BETM activated carbon. The results of this study showed that, in general, using activated carbons with basic surface characteristics, a high specific surface area, and a high volume of carbon mesopores promotes both bisphenols' adsorption process in an aqueous medium.
COMMITTEE MEMBERS:
Externa à Instituição - EMÍLIA KIYOMI KURODA - UEL
Interna - 1512988 - ARIUSKA KARLA BARBOSA AMORIM
Interna - 1122604 - CRISTINA CELIA SILVEIRA BRANDAO
Presidente - 1646057 - YOVANKA PEREZ GINORIS