Basic Metals
Mostrando 1-12 de 36 artigos, teses e dissertações.
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1. Accessing Basic Sites on Modified CoFe2O4 Nanoparticles: Addressing the Selective Oxidation of Benzyl Alcohol and Unraveling the Au:Pd Ratio Effects by XPS
AuPd nanoparticles have gained substantial attention due to their application in selective oxidation of alcohols. However, due to the radical nature of the oxidation of benzyl alcohol, under specific conditions, even without a catalyst, the reaction occurs and affects the selectivity of the system. Therefore, we aimed to develop a catalyst that enables the c
J. Braz. Chem. Soc.. Publicado em: 2020-09
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2. Metal-Resistant Rhizobacteria Change Soluble-Exchangeable Fraction in Multi-Metal-Contaminated Soil Samples
ABSTRACT There is a complex interaction between various components of the soil ecosystem, including microbial biomass and soil chemical contaminants such as heavy metals and radionuclides, which may greatly affect the efficiency of bioremediation techniques. The aim of this study was to investigate microbial capacity to change pH, changes in the metal solubl
Rev. Bras. Ciênc. Solo. Publicado em: 29/03/2018
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3. Inclusion separation of alkali metals in emulsion liquid membranes by nanobaskets of calix[4]crown-3
Nano-assisted inclusion separation of alkali metals from basic solutions was reported by an inclusion-facilitated emulsion liquid membrane process. The novelty of this study is application of nanobaskets of calixcrown in the selective and efficient separation of alkali metals as both the carrier and the surfactant. For this purpose, two diacids, p-tert-butyl
Braz. J. Chem. Eng.. Publicado em: 2012-12
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4. Indústria metalúrgica básica brasileira : perfil setorial, inovatividade e interatividade / Basic metals Brazilian industry : sector profile, innovativeness and interactivity
A Indústria de Metalurgia Básica - IMB (Produção de ferro-gusa e ferro liga, Siderurgia,Produção de tubos de aço exceto tubos sem costura, Metalurgia de metais não ferrosos e Fundição) brasileira é internacionalmente competitiva e detém a posição de segundo maior exportador da indústria de transformação nacional. Ao mesmo tempo, apesar de se
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/12/2011
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5. Produção de monoéster via etanólise por hidrotalcitas termoativadas : síntese e caracterização
Among biofuels of the 1st generation, biodiesel stands out for its equivalent features to those of mineral diesel, however less polluting. It can be obtained by transesterification of triglyceride fats or vegetable oils by (m)ethanolysis. Aiming at improving the chemical process, different types of catalysis have been studied: i) homogeneous (acid e.g. H2SO4
Publicado em: 2011
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6. Síntese e Estudo Termodinâmico em Adutos de Trihaletos de Antimônio e Bismuto com 2,2- Bipiridina e 1,10- Fenantrolina / SYNTHESIS AND THERMODYNAMIC STUDY IN ANTIMOMY AND BISMUTH TRICHOLRIDE ADDUCTS WITH 2,2-BIPYRIDINE AND 1,10-PHENANTROLINE
In this work were synthesized, characterized and studied experimentally and theoretically, the compounds of general formula [MX3 (L)], where M = Sb or Bi, X = Cl, Br, L = 2,2 -bipyridine (Bpy), 1,10-phenanthroline (Phen). The synthesized compounds were characterized by elemental analysis (C, H, N, Cl and Br), thermal analysis (TG / DTA) and absorption spectr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/09/2010
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7. Quitosana modificada quimicamente atraves de cloretos organicos e o uso como fonte em remoção cationica / Chitosan chemically modified with organic chlorides and the use as source in cationic removal
The biopolymer chitosan was submitted to a series of reactions, with the purpose to explore the free amino group reactivity polymeric chain through reactions involving organic chlorides and primary amines compounds. Isophthaloyl dichloride and cyanuric chloride were used in the modifications, following by reactions with ethylenediamine or diethylenetriamine.
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/04/2010
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8. Classificação periódica: um exemplo didático para ensinar análise de componentes principais
A dataset of chemical properties of the elements is used herein to introduce principal components analysis (PCA). The focus in this article is to verify the classification of the elements within the periodic table. The reclassification of the semimetals as metals or nonmetals emerges naturally from PCA and agrees with the current SBQ/IUPAC periodic table. Da
Química Nova. Publicado em: 2010
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9. Reference values for lead, cadmium and mercury in blood of adults from the Metropolitan Area of São Paulo / Valores de referência para chumbo, cádmio e mercúrio em população adulta da Região Metropolitana de São Paulo
The use of biomarkers to assess the exposure of humans to environmental contaminants, human biomonitoring (HB), provides a direct relationship between chemical exposure and internal dose. The results of the HB of the general population should be compared with reference values (RV) obtained in a defined group of the general population and derived by statistic
Publicado em: 2009
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10. Optical sensors and instrumentations for determination of contaminants in water / Sensores opticos e instrumentação para determinação de contaminantes em aguas
This work describes the development of optical sensors for determination of benzene, toluene, ethylbenzene and xylenes (BTEX) and metal ions in water. For the determination of BTEX, monoliths of polydimethylsiloxane (PDMS) were inserted into a bottle filled with aqueous solutions of BTEX compounds for a pre-defined period of time. Afterwards the sensing phas
Publicado em: 2009
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11. Purificação da glicerina bruta obtida a partir da transesterificação do óleo de algodão / Purificação da glicerina bruta obtida a partir da transesterificação do óleo de algodão
The crude glycerine is a raw material that can be used in a wide variety of products. Even with all the impurities inherent in the process of being obtained, the crude glycerin is already in a marketable product. However, the market is much more favorable to the commercialization of purified glycerine. The glycerin is a byproduct gotten from the process of t
Publicado em: 2009
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12. Estudo da oxidação superficial de ligas odontológicas de Ni-Cr em plasma pulsado para uso em restaurações metalocerâmicas
Metal ceramic restorations matches aesthetic and strength, and in your making occurs an interface oxide layer, wetting resulting and atomic and ionic interactions resulting between metal, oxide and porcelain. However, frequent clinical fails occurs in this restoration type, because lost homogeneous deposition oxide layer and lost interface bond. Thus, in thi
Publicado em: 2008