Título: | BIOSSORPTION OF HEAVY METALS ON GREEN COCONUT POWDER | ||||||||||||||||||||||||||||||||||||||||
Autor: |
GABRIELA ALEJANDRA HUAMAN PINO |
||||||||||||||||||||||||||||||||||||||||
Colaborador(es): |
LUCIANA MARIA SOUZA DE MESQUITA - Orientador MAURICIO LEONARDO TOREM - Coorientador |
||||||||||||||||||||||||||||||||||||||||
Catalogação: | 20/DEZ/2005 | Língua(s): | PORTUGUESE - BRAZIL |
||||||||||||||||||||||||||||||||||||||
Tipo: | TEXT | Subtipo: | THESIS | ||||||||||||||||||||||||||||||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
||||||||||||||||||||||||||||||||||||||||
Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=7596&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=7596&idi=2 |
||||||||||||||||||||||||||||||||||||||||
DOI: | https://doi.org/10.17771/PUCRio.acad.7596 | ||||||||||||||||||||||||||||||||||||||||
Resumo: | |||||||||||||||||||||||||||||||||||||||||
Heavy metal pollution has become one of the most serious
problems today,
and the use of organic material biomass for the
detoxification of industrial
effluents for environmental protection offers a potential
alternative to existing
trea tment technologies. The aim of this work was
determined the biosorption
capacity of coconut fibers (Cocos nucifera) for different
heavy metals. The effect
of pH, initial concentration, size of particle and
kinetics were studied. The
characteristics of the surface of coconut fibers had been
investigated using
measurements of potential zeta and analyses with scanning
electron microscope.
The removal was found to be higher for cadmium, chromium
(III) e chromium (VI)
among the 6 metallic species studied (As, Cd, Cr (III), Cr
(VI), Ni e Zn). The
values of pH used were 7 for cadmium and chromium (III)
and of 2 for chromium
(VI). For cadmium, chromium (III) and chromium (VI), with
an initial metal
concentration lower than 100 mg/L, removal rates of 95%,
85% and 80%
respectively had been observed. For cadmium and chromium
(III), with an initial
concentration lower than 1000 mg/L, removal rates of 80%
and 85% respectively
were found. The adsorption capacity of coconut fibers for
heavy metals had been
evaluated using Langmuir and Freundlich adsorption
isotherms. The Langmuir´s
model gave best results for cadmium and chromium (VI) and
Freundlich´s model
for chromium (III). The kinetics of the process was
studied just for cadmium,
because it presented the best removal rates. The kinetics
study showed that the
biosorption process followed a pseudo second order model.
This suggests that
coconut fibers represent a good option for biosorption
process and can be used
as an alternative to the classical technologies for
effluent decontamination.
|
|||||||||||||||||||||||||||||||||||||||||
|