Výsledky vyhledávání - "Carlos F Rivas"

Akademický článek

Análisis correlacional y contenido de metales pesados en sedimentos superficiales de la avenida Argimiro Gabaldón de la ciudad de Barcelona, Estado Anzoátegui, Venezuela

Autor: Carlos F. Rivas, Carlos De La Cruz, Ricardo De La Cruz, Orlando De La Cruz, Julio Colivet

Publikováno v: Avances en Química, Vol 7, Iss 2, Pp 111-117 (2012)

We investigated the concentration levels of heavy metals (Cu, Ni, Pb, Cr and Zn) in soils adjacent to the Argimiro Gabaldón, Avenue, Barcelona (Anzoátegui).Ni and Cr showed lower values than that permitted by the Venezuelan legislation while the Zn

Externí odkaz: https://doaj.org/article/d509180684c942bb96d21fda893c8db8

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(Z)-3-(4-(Dimethylamino)benzylidene)thiochroman-4-one: Synthesis, Crystal Structure and Molecular Modelling Using Density Functional Theory

Autor: Alexander Briceño, Neudo Urdaneta, Gustavo Liendo, Jesús Núñez, Carlos F Rivas, Teresa González

Publikováno v: Journal of Chemical Crystallography. 50:176-186

The title compound C18H17NOS was synthesized by condensation of thiochroman-4-one with 4-dimethylaminobenzaldehyde. The possible existence of the 3-(4-(Dimethylamino)benzylidene)thiochroman-4-one (E)- and (Z)-geometrical isomers was investigated usin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::25d72b0f1a255e172c7567bec7171eb0
https://doi.org/10.1007/s10870-019-00779-4

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OXIDACIÓN DE p -NITROFENOL USANDO TiO 2 -ADENOSINA MONOFOSFATO I OXIDATION OF p -NITROPHENOL USING TiO 2 -ADENOSIN MONOPHOSPHATE

Autor: Carlos F. Rivas, Oswaldo Núñez, Ronald Vargas

Publikováno v: Saber, Vol 26, Iss 4, Pp 458-464 (2018)

The surface of TiO2 was modified with the nucleotides adenosine 3’-monophosphate (AMP’3) and Adenosine 5’-monophosphate (AMP’5). The adsorption of nucleotides was adjusted to Langmuir ́s adsorption model, determining that the optimal conditi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doajarticles::9752740c160e020e4adafa69f3ffa95e
http://ojs.udo.edu.ve/index.php/saber/article/view/1560/1108

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ISOTERMA DE LANGMUIR Y FREUNDLICH COMO MODELOS PARA LA ADSORCIÓN DE COMPONENTES DE ÁCIDO NUCLEICO SOBRE WO 3 I LANGMUIR AND FREUNDLICH ISOTHERMS AS MODEL FOR THE ADSORPTION OF NUCLEIC ACID COMPONENTS ON WO 3

Autor: Carlos F. Rivas, Oswaldo Núñez, Francisco Longoria, Lucy González

Publikováno v: Saber, Vol 26, Iss 1, Pp 43-49 (2014)

In this paper, we studied the effect of pH (3-10) in the adsorption of nucleic acid constituents; nucleobases, nucleosides and nucleotides, on tungsten trioxide (WO3). Isotherms of Langmuir and Freundlich were used to describe adsorption processes. I

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doajarticles::b4b241411817ca2c2db462b08a9b36fa
http://ojs.udo.edu.ve/index.php/saber/article/view/1265/970

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Minimizing electron-hole recombination in modified TiO2photocatalysis: electron transfer to solution as rate-limiting step in organic compounds degradation

Autor: Ronald Vargas, Oswaldo Núñez, Carlos F. Rivas

Publikováno v: Journal of Physical Organic Chemistry. 30:e3659

4-Stilbenecarboxaldehyde (4SCA) at pH 3 was added to TiO2 anatase to form a new catalyst where the aldehyde carbonyl group reacts with the TiO2-OH to form the corresponding acetal (4SCA-TiO2). 4SCA-TiO2 significantly retards the electron recombinatio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::00ddd81791ba30ddfd45fea91958fa69
https://doi.org/10.1002/poc.3659

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Evaluación de la degradación fotocatalítica del p-nitrofenol sobre la superficie modificada del TiO2 con benzaldehídos disustituidos

Autor: CARLOS F. RIVAS, OSWALDO NÚÑEZ

La superficie del TiO2 fue modificada con benzaldehído disustituidos, se utilizó el 3,4- dihidroxibenzaldehido (DHBA), el 3-hidroxi-4-metoxibenzaldehido (HMBA) y el 3,4-dimetoxibenzaldehido (DMBA). La adsorción de los aldehídos se ajustó a los m

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6d887539b3a135b63196c50deb9d00a4

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