Estudo da adsorção de íons ortofosfato em hidróxido de alumínio
| Ano de defesa: | 2009 |
|---|---|
| Autor(a) principal: |
DAMASCENO, Fernando Cruvinel
 |
| Orientador(a): |
LIMA, Emilia Celma de Oliveira
|
| Banca de defesa: | |
| Tipo de documento: | Dissertação |
| Tipo de acesso: | Acesso aberto |
| Idioma: | por |
| Instituição de defesa: |
Universidade Federal de Goiás
|
| Programa de Pós-Graduação: |
Mestrado em Química
|
| Departamento: |
Educação em Química
|
| País: |
BR
|
| Palavras-chave em Português: | |
| Palavras-chave em Inglês: | |
| Área do conhecimento CNPq: | |
| Link de acesso: | http://repositorio.bc.ufg.br/tede/handle/tde/1061 |
Resumo: | Aluminum hydroxides are efficient phosphate adsorbents. In this work it was investigated the adsorptions of phosphate in three different forms of aluminum hydroxide (amorphous, bayerite and pseudo-boehmite). The adsorption isotherms present the amount of phosphate adsorbed as a functions of the equilibrium concentration of orthophosphate ions aqueous solutions, in pH = 5. The products of adsorption were characterized by infrared spectroscopy, 27Al e 31P NMR spectroscopy, XRD analysis, and by zeta potential measurements of the aqueous dispersions. The adsorption isotherms of phosphate on aluminum hydroxide showed that when the hydroxides are treated with diluted phosphate solutions (< 2,0 mmolL-1) the three hydroxides adsorb similar amount of phosphate. When the hydroxides are treated with concentrated phosphate solutions (> 2,0 mmolL-1) bayerite and amorphous aluminum hydroxide incorporate much more phosphate than pseudo-boehmite. The IR and the NMR 27Al and 31P analysis of the adsorption products showed that when the adsorption is carried out in low concentrate phosphate solutions, the adsorbed species are surface aluminum phosphate complexes, while in samples treated with concentrated phosphate solution the products of adsorption are solid phases of aluminum phosphate. These results suggest that the incorporation of phosphate by the three aluminum hydroxides studied occur in two steps. In the first step the phosphate are adsorbed yielding surface complexes; in the second step the incorporation of phosphate occur via the process of aluminum dissolution and precipitation of an aluminum phosphate phase. The XRD analysis showed that the precipitate formed during the dissolution-precipitation process is amorphous and become crystalline after heated at 750 °C for 30 min. The slope of the zeta potential measurements of the aqueous suspensions of the adsorption products suggests that the concentration of the phosphate solution at which the transition of phosphate incorporation by adsorption changes to phosphate incorporation by dissolution-precipitation is similar for the three hydroxides (2 mmolL-1). The results showed that the incorporation of phosphate by precipitation-dissolution occur on the three hydroxides but with lower extension on pseudo-bohemite. This behavior might by related to the lower dissolution of pseudo-bohemite because it is more condensed than amorphous aluminum hydroxide and bayerite |
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LIMA, Emilia Celma de Oliveirahttp://lattes.cnpq.br/0176904550618260http://lattes.cnpq.br/3909002426400306DAMASCENO, Fernando Cruvinel2014-07-29T15:12:49Z2010-01-212009-05-26DAMASCENO, Fernando Cruvinel. Study of adsorption of orthophosphate ions on aluminum hydroxide. 2009. 87 f. Dissertação (Mestrado em Educação em Química) - Universidade Federal de Goiás, Goiânia, 2009.http://repositorio.bc.ufg.br/tede/handle/tde/1061Aluminum hydroxides are efficient phosphate adsorbents. In this work it was investigated the adsorptions of phosphate in three different forms of aluminum hydroxide (amorphous, bayerite and pseudo-boehmite). The adsorption isotherms present the amount of phosphate adsorbed as a functions of the equilibrium concentration of orthophosphate ions aqueous solutions, in pH = 5. The products of adsorption were characterized by infrared spectroscopy, 27Al e 31P NMR spectroscopy, XRD analysis, and by zeta potential measurements of the aqueous dispersions. The adsorption isotherms of phosphate on aluminum hydroxide showed that when the hydroxides are treated with diluted phosphate solutions (< 2,0 mmolL-1) the three hydroxides adsorb similar amount of phosphate. When the hydroxides are treated with concentrated phosphate solutions (> 2,0 mmolL-1) bayerite and amorphous aluminum hydroxide incorporate much more phosphate than pseudo-boehmite. The IR and the NMR 27Al and 31P analysis of the adsorption products showed that when the adsorption is carried out in low concentrate phosphate solutions, the adsorbed species are surface aluminum phosphate complexes, while in samples treated with concentrated phosphate solution the products of adsorption are solid phases of aluminum phosphate. These results suggest that the incorporation of phosphate by the three aluminum hydroxides studied occur in two steps. In the first step the phosphate are adsorbed yielding surface complexes; in the second step the incorporation of phosphate occur via the process of aluminum dissolution and precipitation of an aluminum phosphate phase. The XRD analysis showed that the precipitate formed during the dissolution-precipitation process is amorphous and become crystalline after heated at 750 °C for 30 min. The slope of the zeta potential measurements of the aqueous suspensions of the adsorption products suggests that the concentration of the phosphate solution at which the transition of phosphate incorporation by adsorption changes to phosphate incorporation by dissolution-precipitation is similar for the three hydroxides (2 mmolL-1). The results showed that the incorporation of phosphate by precipitation-dissolution occur on the three hydroxides but with lower extension on pseudo-bohemite. This behavior might by related to the lower dissolution of pseudo-bohemite because it is more condensed than amorphous aluminum hydroxide and bayeriteHidróxidos de alumínio são conhecidos como bons adsorventes de fosfato. Nesse trabalho investigou-se a eficiência na incorporação de fosfato de três diferentes tipos de hidróxido de alumínio (amorfo, bayerita e pseudo-boehmita). O estudo foi realizado obtendo-se as isotermas de adsorção de fosfato nos três hidróxidos. Determinou-se o potencial zeta dos produtos das adsorções e caracterizou-se os produtos por espectroscopia na região do infravermelho, espectroscopia de RMN (31P e 27Al) e difratometria de raios X. As curvas de adsorção mostram que em concentrações baixas de fosfato (< 2,0 mmolL-1) os três hidróxidos de alumínio incorporam quantidades semelhantes de fosfato, enquanto que em concentrações altas de fosfato (> 2,0 mmolL-1) o hidróxido de alumínio amorfo e a bayerita incorporam quantidades de fosfato superior à quantidade incorporada pela pseudo-boehmita. A caracterização dos produtos da adsorção por IV e RMN revelou que quando se emprega soluções diluídas de fosfato, os produtos de adsorção são complexos superficiais de ortofosfato com alumínio, o que é indicativo de que a incorporação de fosfato se dá por adsorção. Nas amostras tratadas com soluções de fosfato concentradas foi observada a presença de uma fase de fosfato de alumínio, o que sugere que nestas condições, a incorporação de fosfato ocorre principalmente pelo processo de dissolução do hidróxido de alumínio seguida de precipitação de uma fase de fosfato de alumínio. As análises por DRX dos produtos da adsorção em altas concentrações de fosfato revelaram que a fase formada durante o processo de dissolução-precipitação é amorfa e transforma-se em AlPO4 cristalino quando submetida a aquecimento a temperatura de 750 °C por 30 min. As medidas de potencial zeta dos produtos de adsorção indicam que nos três hidróxidos estudados o processo de incorporação de fosfato se dá pelos mesmos processos: inicialmente, por adsorção de fosfato e em seguida por dissolução do hidróxido e precipitação de fosfato de alumínio. Os resultados mostram que a incorporação de fosfato por dissolução-precipitação ocorre nos três hidróxidos, mas com maior extensão no hidróxido de alumínio amorfo e na bayerita e com menor extensão na pesudo-boehmita. Esse comportamento pode estar relacionado com o fato da pseudo-boehmita ser o hidróxido de alumínio mais condensado e consequentemente menos susceptível ao processo de dissoluçãoMade available in DSpace on 2014-07-29T15:12:49Z (GMT). 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| dc.title.por.fl_str_mv |
Estudo da adsorção de íons ortofosfato em hidróxido de alumínio |
| dc.title.alternative.eng.fl_str_mv |
Study of adsorption of orthophosphate ions on aluminum hydroxide |
| title |
Estudo da adsorção de íons ortofosfato em hidróxido de alumínio |
| spellingShingle |
Estudo da adsorção de íons ortofosfato em hidróxido de alumínio DAMASCENO, Fernando Cruvinel phosphate aluminum hydroxide adsorption phosphate aluminum hydroxide adsorption CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
| title_short |
Estudo da adsorção de íons ortofosfato em hidróxido de alumínio |
| title_full |
Estudo da adsorção de íons ortofosfato em hidróxido de alumínio |
| title_fullStr |
Estudo da adsorção de íons ortofosfato em hidróxido de alumínio |
| title_full_unstemmed |
Estudo da adsorção de íons ortofosfato em hidróxido de alumínio |
| title_sort |
Estudo da adsorção de íons ortofosfato em hidróxido de alumínio |
| author |
DAMASCENO, Fernando Cruvinel |
| author_facet |
DAMASCENO, Fernando Cruvinel |
| author_role |
author |
| dc.contributor.advisor1.fl_str_mv |
LIMA, Emilia Celma de Oliveira |
| dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/0176904550618260 |
| dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/3909002426400306 |
| dc.contributor.author.fl_str_mv |
DAMASCENO, Fernando Cruvinel |
| contributor_str_mv |
LIMA, Emilia Celma de Oliveira |
| dc.subject.por.fl_str_mv |
phosphate aluminum hydroxide adsorption |
| topic |
phosphate aluminum hydroxide adsorption phosphate aluminum hydroxide adsorption CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
| dc.subject.eng.fl_str_mv |
phosphate aluminum hydroxide adsorption |
| dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
| description |
Aluminum hydroxides are efficient phosphate adsorbents. In this work it was investigated the adsorptions of phosphate in three different forms of aluminum hydroxide (amorphous, bayerite and pseudo-boehmite). The adsorption isotherms present the amount of phosphate adsorbed as a functions of the equilibrium concentration of orthophosphate ions aqueous solutions, in pH = 5. The products of adsorption were characterized by infrared spectroscopy, 27Al e 31P NMR spectroscopy, XRD analysis, and by zeta potential measurements of the aqueous dispersions. The adsorption isotherms of phosphate on aluminum hydroxide showed that when the hydroxides are treated with diluted phosphate solutions (< 2,0 mmolL-1) the three hydroxides adsorb similar amount of phosphate. When the hydroxides are treated with concentrated phosphate solutions (> 2,0 mmolL-1) bayerite and amorphous aluminum hydroxide incorporate much more phosphate than pseudo-boehmite. The IR and the NMR 27Al and 31P analysis of the adsorption products showed that when the adsorption is carried out in low concentrate phosphate solutions, the adsorbed species are surface aluminum phosphate complexes, while in samples treated with concentrated phosphate solution the products of adsorption are solid phases of aluminum phosphate. These results suggest that the incorporation of phosphate by the three aluminum hydroxides studied occur in two steps. In the first step the phosphate are adsorbed yielding surface complexes; in the second step the incorporation of phosphate occur via the process of aluminum dissolution and precipitation of an aluminum phosphate phase. The XRD analysis showed that the precipitate formed during the dissolution-precipitation process is amorphous and become crystalline after heated at 750 °C for 30 min. The slope of the zeta potential measurements of the aqueous suspensions of the adsorption products suggests that the concentration of the phosphate solution at which the transition of phosphate incorporation by adsorption changes to phosphate incorporation by dissolution-precipitation is similar for the three hydroxides (2 mmolL-1). The results showed that the incorporation of phosphate by precipitation-dissolution occur on the three hydroxides but with lower extension on pseudo-bohemite. This behavior might by related to the lower dissolution of pseudo-bohemite because it is more condensed than amorphous aluminum hydroxide and bayerite |
| publishDate |
2009 |
| dc.date.issued.fl_str_mv |
2009-05-26 |
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2010-01-21 |
| dc.date.accessioned.fl_str_mv |
2014-07-29T15:12:49Z |
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info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/masterThesis |
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masterThesis |
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publishedVersion |
| dc.identifier.citation.fl_str_mv |
DAMASCENO, Fernando Cruvinel. Study of adsorption of orthophosphate ions on aluminum hydroxide. 2009. 87 f. Dissertação (Mestrado em Educação em Química) - Universidade Federal de Goiás, Goiânia, 2009. |
| dc.identifier.uri.fl_str_mv |
http://repositorio.bc.ufg.br/tede/handle/tde/1061 |
| identifier_str_mv |
DAMASCENO, Fernando Cruvinel. Study of adsorption of orthophosphate ions on aluminum hydroxide. 2009. 87 f. Dissertação (Mestrado em Educação em Química) - Universidade Federal de Goiás, Goiânia, 2009. |
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