Estudo de materiais mesoporosos a base de sílica e carbono para adsorção de corantes: adsorção de Rodamina B em SBA-15 E CMK-3
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 differen...
Na minha lista:
| Autor principal: | |
|---|---|
| Outros Autores: | |
| Formato: | bachelorThesis |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
|
| Assuntos: | |
| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/33337 |
| Tags: |
Adicionar Tag
Sem tags, seja o primeiro a adicionar uma tag!
|
| Resumo: | 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 SBA15 (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. |
|---|