Preparação de eletrodos de hidroxiapatita por diferentes metodologias de síntese e sua aplicação na determinação de fosfito em fertilizantes líquidos

Souza, Josiane de; Martin, Neiva; Oliveira, Silvana Ruella de; Lindino, Cléber Antônio

doi:10.4025/actascitechnol.v30i2.5499

Cited by 2 publications

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“…Ultraviolet-visible spectrum was obtained at a wavelength between 190 and 700 nm in a Shimadzu spectrophotometer UV-1601 PC, double beam to MT diluted in ethanol at a concentration of 10 µg mL -1 . The hydroxyapatite was synthesized by two methodologies called conventional precipitation (CP) and homogeneous precipitation (HP) using urea, according to Souza et al (2008) doping-free and doping with nickel (Ni) and copper (Cu) in concentrations of 0.01 mol L -1 , added to the Ca 2+ solutions during the synthesis, under mechanical stirring. Then, the precipitate was maintained under the same conditions of preparation for 24 hours for digestion.…”

Section: Methodsmentioning

confidence: 99%

Degradation of 17α-methyltestosterone by hydroxyapatite catalyst

Savaris¹,

Matos²,

Lindino³

2018

Rev. ambiente água

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Fish farming is becoming a highly profitable economic activity and the rearing of fingerlings involves the practice of sex reversal for the production of species (male) using the hormone 17α-methyltestosterone (MT). This study analyzed the methodology for degradation of the hormone through solar and ultraviolet radiation using hydroxyapatite (HAP) as heterogeneous catalyst, synthesized by two different methods, with and without doping with nickel and copper. The results showed that MT hormone is degraded by ultraviolet or solar radiation, and accelerated in the presence of the HAP catalyst. In the presence of Fe (III) in the medium, the degradation rate of the hormone decreases. The method of HAP synthesis influences the degradation efficiency.Keywords: fish fry, hormone, fish-farming. Degradação de 17α-metiltestosterona com catalisador hidroxiapatita RESUMOA piscicultura tem se tornado uma atividade econômica altamente rentável e, para isto, a criação de alevinos adota a prática da reversão sexual para produção de espécies (macho) por meio do hormônio 17α-metiltestosterona (MT). Este trabalho desenvolveu metodologia para a degradação deste hormônio, por meio de radiação solar e ultravioleta utilizando catalisador heterogêneo hidroxiapatita (HAP) sintetizada por dois métodos diferentes, com e sem dopagem com níquel e cobre. Os resultados mostraram que o hormônio MT é degradado pela radiação ultravioleta ou solar, sendo acelerado na presença do catalisador HAP e a presença de Fe(III) no meio diminui a velocidade de degradação do hormônio. O método de síntese da HAP influencia na eficiência da degradação.Palavras-chave: alevinos, hormônio, piscicultura.

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Section: Methodsmentioning

confidence: 99%