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| Registros recuperados : 568 | |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
11/08/2023 |
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Data da última atualização: |
11/08/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 1 |
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Autoria: |
SANTOS, A. L. dos; AMARAL, Á. L. S. do; SOUZA, C. R. S.; BATISTA, D. C.; PARIS, E. C.; FIGUEIREDO, A. T. de; GIRALDI, T. R. |
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Afiliação: |
ELAINE CRISTINA PARIS, CNPDIA. |
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Título: |
Influence of structural and surface properties of Nb2O5 pellets on methylene blue adsorption and adsorbent reuse capacity. |
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Ano de publicação: |
2023 |
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Fonte/Imprenta: |
Cerâmica, v. 69, 2023. |
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Páginas: |
133 - 140 |
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DOI: |
http://dx.doi.org/10.1590/0366-69132023693903426 |
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Idioma: |
Inglês |
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Conteúdo: |
This study aimed to describe the preparation of Nb2O5 pellets by uniaxial pressing, to investigate the influence of heat treatment at different temperatures (800, 900, and 1000 °C) on the physical, surface, microstructural, and adsorptive properties of the materials, and to assess their potential as reusable adsorbents for methylene blue removal. Specimens treated at 800 °C contained a mixture of monoclinic and hexagonal phases, with a predominance of monoclinic structures. By contrast, heat treatment at 900 °C and above resulted in complete conversion to the monoclinic phase. The surface of Nb2O5 particles contained basic groups, possibly oxygen ions (O-). Experimental investigations showed that methylene blue adsorption followed second-order kinetics, suggesting chemical diffusion as the dominant process. Maximum adsorption occurred at pH 6.0. Pellets remained intact after the adsorption test. A study was carried out to determine the reusability of pellets over five adsorption cycles in methylene blue solutions at different concentrations. The maximum adsorbed concentration was 10.4 mg.L-1. The adsorption capacity of Nb2O5 specimens gradually decreased from 56% in the first cycle to 25% in the fifth cycle. Despite this reduction in removal efficiency, Nb2O5 pellets showed promise as reusable adsorbents in heterogeneous processes because of their high potential adsorption capacity and easy separation from the reaction medium. |
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Palavras-Chave: |
Niobium pentoxide; Reuse. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02198naa a2200241 a 4500
001 2155873
005 2023-08-11
008 2023 bl uuuu u00u1 u #d
024 7 $ahttp://dx.doi.org/10.1590/0366-69132023693903426$2DOI
100 1 $aSANTOS, A. L. dos
245 $aInfluence of structural and surface properties of Nb2O5 pellets on methylene blue adsorption and adsorbent reuse capacity.$h[electronic resource]
260 $c2023
300 $a133 - 140
520 $aThis study aimed to describe the preparation of Nb2O5 pellets by uniaxial pressing, to investigate the influence of heat treatment at different temperatures (800, 900, and 1000 °C) on the physical, surface, microstructural, and adsorptive properties of the materials, and to assess their potential as reusable adsorbents for methylene blue removal. Specimens treated at 800 °C contained a mixture of monoclinic and hexagonal phases, with a predominance of monoclinic structures. By contrast, heat treatment at 900 °C and above resulted in complete conversion to the monoclinic phase. The surface of Nb2O5 particles contained basic groups, possibly oxygen ions (O-). Experimental investigations showed that methylene blue adsorption followed second-order kinetics, suggesting chemical diffusion as the dominant process. Maximum adsorption occurred at pH 6.0. Pellets remained intact after the adsorption test. A study was carried out to determine the reusability of pellets over five adsorption cycles in methylene blue solutions at different concentrations. The maximum adsorbed concentration was 10.4 mg.L-1. The adsorption capacity of Nb2O5 specimens gradually decreased from 56% in the first cycle to 25% in the fifth cycle. Despite this reduction in removal efficiency, Nb2O5 pellets showed promise as reusable adsorbents in heterogeneous processes because of their high potential adsorption capacity and easy separation from the reaction medium.
653 $aNiobium pentoxide
653 $aReuse
700 1 $aAMARAL, Á. L. S. do
700 1 $aSOUZA, C. R. S.
700 1 $aBATISTA, D. C.
700 1 $aPARIS, E. C.
700 1 $aFIGUEIREDO, A. T. de
700 1 $aGIRALDI, T. R.
773 $tCerâmica$gv. 69, 2023.
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