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Previous issue date: 2011-04-16 / The destructive impact of improper disposal of heavy metals in the environment
increases as a direct result of population explosion, urbanization and industrial
expansion and technological developments. Argil are potential materials for
adsorption of inorganic and the pelletization of it is required for use in adsorptive
columns of fixed bed. The low cost and the possibility of regeneration makes
these materials attractive for use in the purification process, capable of
removing inorganic compounds in contaminated aquatic environments. In this
work was made pellets of a mixture of dolomite and montmorillonite by wet
agglomeration, in different percentages. The removal of Pb (II) was investigated
through experimental studies, and was modeled by kinetic models and
isotherms of adsorption. The materials were characterized using the techniques
of XRD, TG / DTA, FT-IR, and surface area by BET method. The results
showed the adsorption efficiency of the contaminant by the composite material
studied in synthetic solution. The study found that the adsorption follows the
Langmuir model, and the kinetics of adsorption follows the model of pseudosecond
order / O impacto destrutivo da disposi??o inadequada de metais pesados no meio
ambiente aumenta como resultado direto da explos?o populacional,
urbaniza??o e expans?o industrial e tecnol?gica. Argilas s?o potenciais
materiais para adsor??o de compostos inorg?nicos e a pelletiza??o destes ?
necess?ria para utiliza??o em colunas adsortivas de leito fixo. O baixo custo e
a possibilidade de regenera??o fazem desses materiais um atrativo para a
utiliza??o em processos de purifica??o, capazes de remover compostos
inorg?nicos em ambientes aqu?ticos contaminados. Neste trabalho foram
preparados pellets com mistura de montmorilonita e dolomita atrav?s da
aglomera??o por via ?mida, em diferentes raz?es. A remo??o de Pb(II) foi
investigada, atrav?s de estudos experimentais, e foi modelada segundo
modelos de cin?tica e isotermas de adsor??o. Os materiais foram
caracterizados atrav?s das t?cnicas de DRX, TG/DTA, FT-IR, e ?rea superficial
pelo m?todo BET. Os resultados mostraram a efici?ncia adsortiva do
contaminante estudado pelo material composto em solu??o sint?tica e foi
verificado que a adsor??o segue o modelo de Langmuir e a cin?tica de
adsor??o segue o modelo de pseudo-segunda ordem
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12730 |
| Date | 16 April 2011 |
| Creators | Pinto, Elida Natasche de Medeiros Gurgel |
| Contributors | CPF:06117988320, http://lattes.cnpq.br/3318871716111536, Freitas, J?lio Cezar de Oliveira, CPF:00957245408, http://lattes.cnpq.br/2357217530716519, Barros, Joana Maria de Farias, CPF:85239658404, http://lattes.cnpq.br/1016070459137884, Melo, Dulce Maria de Ara?jo |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Ci?ncia e Engenharia de Materiais, UFRN, BR, Processamento de Materiais a partir do P?; Pol?meros e Comp?sitos; Processamento de Materiais a part |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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