Banca de QUALIFICAÇÃO: LUAN DO NASCIMENTO DE MOURA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : LUAN DO NASCIMENTO DE MOURA
DATE: 29/10/2021
TIME: 09:00
LOCAL: Remoto - Googlemet
TITLE:

SBA-15 and its Carbon replica CMK-3 for Rhodamine B adsorption

KEY WORDS:

SBA-15, CMK-3 mesoporous materials, dyes, Rhodamine B, adsoprtion

PAGES: 50
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
SPECIALTY: Cerâmicos
SUMMARY:

Water-soluble contaminants have been of great concern to the scientific community due to their unpredictable harmful effects on biomes and human health. Dyes are widely applied in industrial processes and discharged into water bodies without proper treatment. There are several studies of different techniques applied to the removal of industrial dyes from wastewater. Adsorption has been widely studied due to its low application cost and high performance in effluent treatment. The application of molecular sieves in adsorption enables the study of the dynamics and optimization of such physical-chemical process. Mesoporous materials have great accessibility to bulky molecules such as organic compounds and dyes. However, the chemical composition, specific area, and morphology of porous systems play a fundamental role in the adsorption of these compounds. Rhodamine B is an organic dye widely used in industry and was used in this study as a model molecule. Ordered mesoporous silica (SBA-15) and carbon-based (CMK-3) materials were used for the adsorption of Rhodamine B. The materials were synthesized and characterized by X-ray diffractometry (XRD), textural analysis by N2 adsorption, and infrared spectroscopy. The results show materials with a high specific area (> 600 m2/g) and hexagonal arrangement of the pore system. Adsorption measurements show the high efficiency of CMK-3 in removing Rhodamine B (>99%), while SBA-15 only removes ~5%. The results indicate that the composition plays an important role in the adsorption process. Carbon materials are more interactive with the dye molecule than silica materials. The morphology and size of the channels have a strong relationship with the accessibility and adsorption of Rhodamine B. The arrangement of the straight pores of the SBA-15 (6.5 nm average diameter) makes it difficult for the dye molecules dissolved in the solution to access, blocking the entry of pores by the first adsorbed molecules preventing the continuation of the adsorption process. Such behavior does not occur with CMK-3, since the mesopores of the material are open and guarantee good accessibility.

BANKING MEMBERS:
Presidente - 1308577 - SIBELE BERENICE CASTELLA PERGHER
Interno - 1350249 - RUBENS MARIBONDO DO NASCIMENTO
Externo ao Programa - 1804952 - FERNANDO JOSÉ VOLPI EUSÉBIO DE OLIVEIRA