Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Rení Ventura da Silva Alfaya"'
Autor:
Antonio Alberto da Silva Alfaya, Rodrigo Ferrari de Castilho, Rení Ventura da Silva Alfaya, Thiago da Cruz Canevari
Publikováno v:
Semina: Ciências Exatas e Tecnológicas, Vol 27, Iss 2, Pp 129-138 (2006)
The SiO2/SnO2/Phosphate composite, SSF, was prepared by the sol-gel process. The redox dye methylene blue was immobilized on the SSF surface. This new material was utilized in the preparation of a modified carbon paste electrode (SSFAM) and its elect
Externí odkaz:
https://doaj.org/article/e95daecd232f45efa7ef33f20453c947
Autor:
Thiago da Cruz Canevari, Rodrigo Ferrari de Castilho, Rení Ventura da Silva Alfaya, Antonio Alberto da Silva Alfaya
Publikováno v:
Semina: Ciências Exatas e Tecnológicas, Vol 27, Iss 2 (2006)
O compósito SiO2/SnO2/Fosfato, SSF, foi preparado pelo processo sol-gel. O corante redox azul de metileno foi imobilizado na superfície do SSF. Esse novo material foi utilizado na preparação de um eletrodo de pasta de carbono modificado (SSFAM) e
Externí odkaz:
https://doaj.org/article/ae1d9ef45fe74882867e4df28cc3b8dd
Autor:
Talita de Oliveira Caretta, Camila Suemi Inagaki, Antonio Alberto da Silva Alfaya, Rení Ventura da Silva Alfaya
Publikováno v:
Desalination and Water Treatment. 51:5537-5546
Adsorption experiments were carried out using waste Mexerica mandarin “Citrus nobilis” peel as a new biosorbent to adsorb Cu(II), Cd(II), and Pb(II) ions from aqueous solutions at room temperature. To achieve the best adsorption conditions, the i
Autor:
Adriana Jesus da Cunha, Rení Ventura da Silva Alfaya, Álisson Gomes Paulino, Antonio Alberto da Silva Alfaya
Publikováno v:
Desalination and Water Treatment. 52:4223-4233
In this work, the removal of Cu(II), Zn(II), Cd(II), and Pb(II) ions from aqueous solution by natural cotton fiber modified with citric acid (NCFCA) is reported, using both batch and continuous systems. Specifically, kinetics and adsorption isotherms
Autor:
Yoshitaka Gushikem, Pedro R. Anizelli, Antonio Alberto da Silva Alfaya, Bernard Gardes, Rení Ventura da Silva Alfaya, Dariane Nesello, Flaveli Aparecida de Souza Almeida, Claudinei F. Teixeira
Publikováno v:
Journal of Applied Polymer Science. 121:1214-1219
A new material of cotton fiber/Al2O3/SiPy+Cl−, COTALPy, was prepared containing on its surface the polymer silsesquioxane 3-n-propylpyridinium chloride strongly adhered. This new composite based on long fibers of natural cotton is chemically stable
Autor:
Alfredo A. Muxel, Rení Ventura da Silva Alfaya, Antonio Alberto da Silva Alfaya, Flaveli Aparecida de Souza Almeida, Sonia Maria Nobre Gimenez
Publikováno v:
CLEAN - Soil, Air, Water. 39:289-295
The natural cotton fiber was used to synthesize an anion exchange, containing ZrO 2 film on its surface, NCFZC (natural cotton fiber/ZrO 2 composite). This anion exchanger was produced by the reaction of the zirconium oxychloride and hydroxyl groups
Autor:
Rení Ventura da Silva Alfaya, Antonio Alberto da Silva Alfaya, Rodrigo Ferrari de Castilho, Eloana Benassi Ribeiro de Souza
Publikováno v:
Electroanalysis. 20:157-162
A modified carbon paste electrode with SiO2/SnO2/Phosphate/Meldola's blue, SSPMelB, was used to study the electrocatalytic oxidation of ascorbic acid by cyclic voltammetry and chronoamperometry. The adsorbed dye mediates ascorbic acid oxidation at an
Autor:
Alfredo A. Muxel, Antonio Alberto da Silva Alfaya, Rení Ventura da Silva Alfaya, Débora A. de Jesus
Publikováno v:
Journal of the Brazilian Chemical Society. 18:572-576
A new polymer, silsesquioxane 3-n-propylpyridinium chloride (SiPy+Cl-), was used in the preparation of an electrode. The polymer coated graphite rod ion selective electrode for Cr(VI) was constructed and evaluated for the determination of Cr(VI) in s
Publikováno v:
Journal of Colloid and Interface Science. 269:32-36
3-n-Propylpyridiniumsilsesquioxane chloride polymer, abbreviated as SiPy+Cl−, was used to coat a porous silica gel, SiO2, surface to form the chemically modified solid SiO2/SiPy+Cl−. The resulting polymer film was well adhered to the surface and
Autor:
Rení Ventura da Silva Alfaya, Yoshitaka Gushikem, Susanne Rath, Antonio Alberto da Silva Alfaya, Felix Guillermo Reyes Reyes
Publikováno v:
Analytical Letters. 33:2859-2871
A polymer coated graphite rod ion selective electrode for saccharin was constructed and evaluated for the determination of saccharin in artificial table top sweeteners. The polymer consists of a thin film of silsesquioxane 3-n-propylpyridinium chlori