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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: |
20/04/2023 |
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Data da última atualização: |
20/04/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
GEOVO, J. D. C.; TORRES, J. A.; GIROTO, A. S.; ROCHA, F. C. N.; GARCIA, M. M.; SILVA, G. T. S. T.; SOUZA, J. R. C.; OLIVEIRA, J. A. de; RIBEIRO, C.; NOGUEIRA, A. E. |
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Afiliação: |
CAUE RIBEIRO DE OLIVEIRA, CNPDIA. |
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Título: |
Evaluation of the activity and selectivity of mesoporous composites of MCM-41 and CuO in the CO2 photoreduction process. |
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Ano de publicação: |
2023 |
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Fonte/Imprenta: |
Journal of Photochemistry & Photobiology, A: Chemistry, v. 439, 114631, 2023. |
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ISSN: |
1010-6030 |
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DOI: |
https://doi.org/10.1016/j.jphotochem.2023.114631 |
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Idioma: |
Inglês |
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Conteúdo: |
The conversion of CO2 into valuable chemical feedstock through photocatalysis is considered an effective strategy to mitigate global warming and energy supply problems. Among the challenges for CO2 photoreduction are the design and synthesis of active photocatalysts with high affinity for the CO2 molecule and suitable reduction potentials of valence and conduction bands to promote the reduction of the CO2 molecule. Molecular sieves (MCM-41) with semiconductors, such as copper oxide, are alternatives to the traditional semiconductors (TiO2 and ZnO) with high CO2 adsorption capacity, high specific surface area, and good stability, making them perfect candidates for photocatalysis. Therefore, in this work, mesoporous composite materials based on MCM-41 and CuO were synthesized via the impregnation method. The synthesized materials were chemically, structurally, and morphologically characterized by XRD, SEM, FTIR, XPS, DRS, N2 adsorption and desorption, and atomic absorption spectroscopy techniques, and the photocatalytic activity in the reduction of CO2 was evaluated under visible radiation. We show that MCM-41 and the composite MCM-41/CuO have significant potential for use in the CO2 photoreduction process, where the composition and different active sites in the photocatalysts play an important role in the activity and selectivity of the products formed. The results showed that the MCM-41 and the composite with 1 % (w/w%) CuO presented high selectivity and production of methanol, with 585.88 and 267.05 μmol.gcatalyst -1 , respectively. Thus, the findings demonstrated the versatility of the MCM-41 to form composites with semiconductors, as well as the need to comprehend the main aspects that influence CO2 photoreduction activities and the selectivity of the composites, including their surface, structural, and electrical features. MenosThe conversion of CO2 into valuable chemical feedstock through photocatalysis is considered an effective strategy to mitigate global warming and energy supply problems. Among the challenges for CO2 photoreduction are the design and synthesis of active photocatalysts with high affinity for the CO2 molecule and suitable reduction potentials of valence and conduction bands to promote the reduction of the CO2 molecule. Molecular sieves (MCM-41) with semiconductors, such as copper oxide, are alternatives to the traditional semiconductors (TiO2 and ZnO) with high CO2 adsorption capacity, high specific surface area, and good stability, making them perfect candidates for photocatalysis. Therefore, in this work, mesoporous composite materials based on MCM-41 and CuO were synthesized via the impregnation method. The synthesized materials were chemically, structurally, and morphologically characterized by XRD, SEM, FTIR, XPS, DRS, N2 adsorption and desorption, and atomic absorption spectroscopy techniques, and the photocatalytic activity in the reduction of CO2 was evaluated under visible radiation. We show that MCM-41 and the composite MCM-41/CuO have significant potential for use in the CO2 photoreduction process, where the composition and different active sites in the photocatalysts play an important role in the activity and selectivity of the products formed. The results showed that the MCM-41 and the composite with 1 % (w/w%) CuO presented high selectivity and production of methan... Mostrar Tudo |
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Palavras-Chave: |
Artificial photosynthesis; CO2 photoreduction; Mechanism; Molecular sieves. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02825naa a2200301 a 4500
001 2153292
005 2023-04-20
008 2023 bl uuuu u00u1 u #d
022 $a1010-6030
024 7 $ahttps://doi.org/10.1016/j.jphotochem.2023.114631$2DOI
100 1 $aGEOVO, J. D. C.
245 $aEvaluation of the activity and selectivity of mesoporous composites of MCM-41 and CuO in the CO2 photoreduction process.$h[electronic resource]
260 $c2023
520 $aThe conversion of CO2 into valuable chemical feedstock through photocatalysis is considered an effective strategy to mitigate global warming and energy supply problems. Among the challenges for CO2 photoreduction are the design and synthesis of active photocatalysts with high affinity for the CO2 molecule and suitable reduction potentials of valence and conduction bands to promote the reduction of the CO2 molecule. Molecular sieves (MCM-41) with semiconductors, such as copper oxide, are alternatives to the traditional semiconductors (TiO2 and ZnO) with high CO2 adsorption capacity, high specific surface area, and good stability, making them perfect candidates for photocatalysis. Therefore, in this work, mesoporous composite materials based on MCM-41 and CuO were synthesized via the impregnation method. The synthesized materials were chemically, structurally, and morphologically characterized by XRD, SEM, FTIR, XPS, DRS, N2 adsorption and desorption, and atomic absorption spectroscopy techniques, and the photocatalytic activity in the reduction of CO2 was evaluated under visible radiation. We show that MCM-41 and the composite MCM-41/CuO have significant potential for use in the CO2 photoreduction process, where the composition and different active sites in the photocatalysts play an important role in the activity and selectivity of the products formed. The results showed that the MCM-41 and the composite with 1 % (w/w%) CuO presented high selectivity and production of methanol, with 585.88 and 267.05 μmol.gcatalyst -1 , respectively. Thus, the findings demonstrated the versatility of the MCM-41 to form composites with semiconductors, as well as the need to comprehend the main aspects that influence CO2 photoreduction activities and the selectivity of the composites, including their surface, structural, and electrical features.
653 $aArtificial photosynthesis
653 $aCO2 photoreduction
653 $aMechanism
653 $aMolecular sieves
700 1 $aTORRES, J. A.
700 1 $aGIROTO, A. S.
700 1 $aROCHA, F. C. N.
700 1 $aGARCIA, M. M.
700 1 $aSILVA, G. T. S. T.
700 1 $aSOUZA, J. R. C.
700 1 $aOLIVEIRA, J. A. de
700 1 $aRIBEIRO, C.
700 1 $aNOGUEIRA, A. E.
773 $tJournal of Photochemistry & Photobiology, A: Chemistry$gv. 439, 114631, 2023.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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Biblioteca |
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Origem |
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Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
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Registro Completo
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Biblioteca(s): |
Embrapa Semiárido. |
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Data corrente: |
09/07/1996 |
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Data da última atualização: |
21/03/2019 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
QUEIROZ, M. A. de; LIMA, A. F.; LOPES, L. H. de O.; VALLEE, G. |
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Afiliação: |
MANOEL ABÍLIO DE QUEIROZ, CPATSA; ALDROVILE FERREIRA LIMA, CPATSA; LUIZ HENRIQUE DE OLIVEIRA LOPES, CPATSA. |
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Título: |
La recherche sur la petite et moyenne hydraulique agricole et sa politique d;expansion dans le tropique semi-aride bresilien. |
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Ano de publicação: |
1986 |
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Fonte/Imprenta: |
In: SEMINAIRE: AMENAGEMENTS HYDRO-AGRICOLES ET SYSTEMES DE PRODUCTION 3., 1986, Montpellier, France. Actes... Monptellier: CIRAD-DSA, 1986. |
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Páginas: |
v. 1, p. 195-201. |
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Série: |
(CIRAD. Collection Documents Systemes Agraires, 6). |
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Idioma: |
Francês |
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Conteúdo: |
Dans le Nordeste bresilien qui couvre 18% du territoire national, 1,2 millions d'hectares sont situes dans la zone semi-aride et concernent 2,4 millions d'exploitations dont environ 85% ont moins de 50 ha. Le systeme de culture pluviale est tres precaire, compte tenu de la faible quantite et de l'irregularite des pluies depuis 1980. De nombreuses actions gouvernementales ont ete tentees pour rationaliser l'utilisation de l'eau dans le Nordeste, mais la plus grande partie de la population n'a pas ete touchee et continue d'emiger. Apres la secheresse du debut des annees 80, le developpement de cette region a ete repense, avec un programme d'appui au petit producteur (PAPP), prevu pour 15 ans, dont la coordination technique est faite par l'EMBRAPA-CPATSA. Pour la premiere fois, les agriculteurs participent a la conception et a la planification des actions de developpement des ressources hudriques et on pense qu'avec une meilleure coordination vulgarisation-recherche-producteur, on obtiendra de meilleurs resultats. |
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Palavras-Chave: |
Farming system; Nordeste; Northeast; Small farmers; Water resource. |
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Thesagro: |
Irrigação; Pequeno Produtor; Recurso Hídrico; Sistema de Produção; Tecnologia. |
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Thesaurus NAL: |
Brazil; irrigation; technology. |
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Categoria do assunto: |
B Sociologia Rural |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/194705/1/La-recherche-sur-Ia-petite-et-moyenne-hydraulique-agricole-et.pdf
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Marc: |
LEADER 02067nam a2200325 a 4500
001 1132947
005 2019-03-21
008 1986 bl uuuu u00u1 u #d
100 1 $aQUEIROZ, M. A. de
245 $aLa recherche sur la petite et moyenne hydraulique agricole et sa politique d;expansion dans le tropique semi-aride bresilien.
260 $aIn: SEMINAIRE: AMENAGEMENTS HYDRO-AGRICOLES ET SYSTEMES DE PRODUCTION 3., 1986, Montpellier, France. Actes... Monptellier: CIRAD-DSA$c1986
300 $av. 1, p. 195-201.
490 $a(CIRAD. Collection Documents Systemes Agraires, 6).
520 $aDans le Nordeste bresilien qui couvre 18% du territoire national, 1,2 millions d'hectares sont situes dans la zone semi-aride et concernent 2,4 millions d'exploitations dont environ 85% ont moins de 50 ha. Le systeme de culture pluviale est tres precaire, compte tenu de la faible quantite et de l'irregularite des pluies depuis 1980. De nombreuses actions gouvernementales ont ete tentees pour rationaliser l'utilisation de l'eau dans le Nordeste, mais la plus grande partie de la population n'a pas ete touchee et continue d'emiger. Apres la secheresse du debut des annees 80, le developpement de cette region a ete repense, avec un programme d'appui au petit producteur (PAPP), prevu pour 15 ans, dont la coordination technique est faite par l'EMBRAPA-CPATSA. Pour la premiere fois, les agriculteurs participent a la conception et a la planification des actions de developpement des ressources hudriques et on pense qu'avec une meilleure coordination vulgarisation-recherche-producteur, on obtiendra de meilleurs resultats.
650 $aBrazil
650 $airrigation
650 $atechnology
650 $aIrrigação
650 $aPequeno Produtor
650 $aRecurso Hídrico
650 $aSistema de Produção
650 $aTecnologia
653 $aFarming system
653 $aNordeste
653 $aNortheast
653 $aSmall farmers
653 $aWater resource
700 1 $aLIMA, A. F.
700 1 $aLOPES, L. H. de O.
700 1 $aVALLEE, G.
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