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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. |
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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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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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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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Registro Completo
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Biblioteca(s): |
Embrapa Agricultura Digital. |
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Data corrente: |
07/02/2014 |
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Data da última atualização: |
22/01/2020 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
MARRACCINI, P.; VIEIRA, N. G.; DUARTE, K. E.; AQUINO, S. O.; CARNEIRO, F. A.; COSTA, T. S.; SUJII, P. S.; VINECKY, F.; ALEKCEVETCH, J. C.; ALVES, G. S. C.; LEROY, T.; BELLIS, F. de; FERRÃO, M. A. G.; DAMATTA, F. M.; POT, D.; SILVA, V. A.; RODRIGUES, G. C.; ANDRADE, A. C. |
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Afiliação: |
Cirad; Cenargen; Cenargen; Cenargen; Cenargen; Cenargen; Cenargen; Cenargen; Cenargen; Cenargen; Cirad; Cirad; MARIA AMELIA GAVA FERRAO, SAPC; FÁBIO M. DAMATTA, UFV; Cirad; Epamig/URESM; GUSTAVO COSTA RODRIGUES, CNPTIA; ALAN CARVALHO ANDRADE, CENARGEN. |
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Título: |
Molecular responses of coffee plants to drought stress. |
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Ano de publicação: |
2013 |
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Fonte/Imprenta: |
In: WORKSHOP ON BIOTIC AND ABIOTIC STRESS TOLERANCE IN PLANTS, 2013, Ilheus. The challenge for the 21st century: book of abstracts. Ilhéus: International Advanced Biology Consortium, 2013. |
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Páginas: |
p. 29. |
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Idioma: |
Inglês |
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Notas: |
Resumo S04T04. |
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Conteúdo: |
With the aim to investigate the molecular mechanisms underlying drought tolerance in coffee plants of C. canephora and C. arabica, qPCR experiments identified more than 80 candidate genes (CGs) presenting differential gene expression between drought-tolerant and drought-susceptible clones/cultivars cultivated under different (with or without) irrigation conditions. |
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Palavras-Chave: |
Tolerância à seca. |
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Thesagro: |
Café. |
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Thesaurus NAL: |
Coffea; Drought tolerance; Water stress. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/96705/1/molecular-S04T04.pdf
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Marc: |
LEADER 01548nam a2200397 a 4500
001 1979069
005 2020-01-22
008 2013 bl uuuu u00u1 u #d
100 1 $aMARRACCINI, P.
245 $aMolecular responses of coffee plants to drought stress.$h[electronic resource]
260 $aIn: WORKSHOP ON BIOTIC AND ABIOTIC STRESS TOLERANCE IN PLANTS, 2013, Ilheus. The challenge for the 21st century: book of abstracts. Ilhéus: International Advanced Biology Consortium$c2013
300 $ap. 29.
500 $aResumo S04T04.
520 $aWith the aim to investigate the molecular mechanisms underlying drought tolerance in coffee plants of C. canephora and C. arabica, qPCR experiments identified more than 80 candidate genes (CGs) presenting differential gene expression between drought-tolerant and drought-susceptible clones/cultivars cultivated under different (with or without) irrigation conditions.
650 $aCoffea
650 $aDrought tolerance
650 $aWater stress
650 $aCafé
653 $aTolerância à seca
700 1 $aVIEIRA, N. G.
700 1 $aDUARTE, K. E.
700 1 $aAQUINO, S. O.
700 1 $aCARNEIRO, F. A.
700 1 $aCOSTA, T. S.
700 1 $aSUJII, P. S.
700 1 $aVINECKY, F.
700 1 $aALEKCEVETCH, J. C.
700 1 $aALVES, G. S. C.
700 1 $aLEROY, T.
700 1 $aBELLIS, F. de
700 1 $aFERRÃO, M. A. G.
700 1 $aDAMATTA, F. M.
700 1 $aPOT, D.
700 1 $aSILVA, V. A.
700 1 $aRODRIGUES, G. C.
700 1 $aANDRADE, A. C.
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