A New Type of Precipitating Agent for Copper Membrane Electrode

Neto, Graciliano Oliveira; Serrano, Sı́lvia Helena Pires; Neves, E. F. A.

doi:10.1080/00032718708066319

Cited by 13 publications

(3 citation statements)

References 13 publications

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“…Spectroscopic techniques such as atomic absorption spectrometry (AAS) 24–31, atomic emission spectroscopy with inductively coupled plasma (AES‐ICP) 32, mass spectrometry with inductively coupled plasma (MS‐ICP) 33–34, ultraviolet‐visible spectrophotometry (UV‐Vis) 35 and energy dispersive X‐ray fluorescence (ED‐XRF) 36 are among the used methods. Besides, other more recent developments point the electrochemical techniques, including potentiometry 37 and stripping voltammetry 38–43 as potential alternative methods to determine metals in ethanol fuel.…”

Section: Introductionmentioning

confidence: 99%

Chemical Regulation of Carbon Quantum Dots from Synthesis to Photocatalytic Activity

Tian

et al. 2013

Chemistry An Asian Journal

166

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Carbon quantum dots (CQDs) were synthesized by heating various carbon sources in HNO3 solution at reflux, and the effects of HNO3 concentration on the size of the CQDs were investigated. Furthermore, the oxygen-containing surface groups of as-prepared CQDs were selectively reduced by NaBH4 , leading to new surface states. The experimental results show that the sizes of CQDs can be tuned by HNO3 concentration and then influence their photoluminescent behaviors; the photoluminescent properties are related to both the size and surface state of the CQDs, but the photocatalytic activities are determined by surface states alone. The different oxygen-containing groups on the surface of the CQDs can induce different degrees of the band bending upward, which determine the separation and combination of the electron-hole pairs. The high upward band bending, which is induced by C=O and COOH groups, facilitates separation of the electron-hole pairs and then enhances high photocatalytic activity. In contrast, the low upward band bending induced by C-OH groups hardly prevents the electron-hole pairs from surface recombination and then exhibits strong photoluminescence. Therefore, both the photocatalytic activities and optical properties of CQDs can be tuned by their surface states.

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Section: Introductionmentioning

confidence: 99%

Chemical Regulation of Carbon Quantum Dots from Synthesis to Photocatalytic Activity

Tian

et al. 2013

Chemistry An Asian Journal

166

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“…Many of these studies use spectroscopic techniques, such as atomic absorption spectrometry (AAS) 6–13, atomic emission spectroscopy with inductively coupled plasma (AES‐ICP) 14, mass spectrometry with inductively coupled plasma (MS‐ICP) 15–16, ultraviolet‐visible spectrophotometry (UV‐Vis) 17 and energy dispersive X‐ray fluorescence (ED‐XRF) 18. Other used the electrochemical techniques, such as potentiometry 19 and stripping voltammetry 20–25.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Determination of Iron and Copper in Ethanol Fuel Using Nafion/Carbon Nanotubes Electrode

2014

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This work presents the analytical method development for iron and copper determination in ethanol fuel. This method was developed using stripping voltammetry with a glassy carbon electrode modified with Nafion/Carbon‐nanotubes. With linear sweep stripping voltammetry was achieved a limit of detection of 7.1×10−7 mol L−1 for Fe3+ and 5.1×10−8 mol L−1 for Cu2+. The amperometric sensitivities were 2.0×106 µA mol−1 L for Fe3+ and 2.8×107 µA mol−1 L for Cu2+. The recovery study showed that the method has good accuracy and repeatability, with recovery of 108 and 103 % for Fe3+ and Cu2+ respectively.

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“…A utilização de técnicas eletroanalíticas na determinação de chumbo em álcool combustível ainda é pouco explorada. Na literatura estão relatadas determinações potenciométricas, empregando eletrodos íons seletivos para cobre [13] e cádmio [14]. A técnica de voltametria de redissolução anódica pode ser empregada na determinação de espécies metálicas, fornecendo alta sensibilidade e precisão com um custo instrumental relativamente baixo.…”

Section: Introductionunclassified

Determinação de chumbo em álcool combustível por voltametria de redissolução anódica utilizando um eletrodo de pasta de carbono modificado com resina de troca iônica Amberlite IR 120

et al. 2006

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Um método envolvendo a pré-concentração e redissolução anódica em condições de voltametria de pulso diferencial empregando um eletrodo de pasta de carbono modificado (EPCM) com uma resina de troca iônica Amberlite IR120 foi proposto para a determinação de íons chumbo em álcool combustível. O procedimento é baseado em um pico de oxidação do analito observado em -0,53 V(vs. Ag/AgCl) em solução de HCl. As melhores condições experimentais encontradas foram: 5% (m/m) da Amberlite IR120 para a construção do eletrodo, solução de HCl 0,1 mol L-1, velocidade de varredura de 10 mVs-1, tempo de pré-concentração de 15 min e amplitude de pulso de 100 mV. Utilizando essas condições, o EPCM apresentou uma resposta linear entre a corrente de pico anódica e a concentração de íons chumbo para o intervalo entre 9,9 x 10-9 e 1,2 x 10-6 mol L-1 e um limite de detecção de 7,2 x 10-9 mol L-1. Valores de recuperação entre 96 % e 102 % foram encontrados para amostras de álcool combustível enriquecidas com Pb2+ em níveis de 10-7 mol L-1. O efeito da presença de outros íons concomitantes sobre a resposta voltamétrica do eletrodo também foi avaliado.

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A New Type of Precipitating Agent for Copper Membrane Electrode

Cited by 13 publications

References 13 publications

Chemical Regulation of Carbon Quantum Dots from Synthesis to Photocatalytic Activity

Chemical Regulation of Carbon Quantum Dots from Synthesis to Photocatalytic Activity

Simultaneous Determination of Iron and Copper in Ethanol Fuel Using Nafion/Carbon Nanotubes Electrode

Determinação de chumbo em álcool combustível por voltametria de redissolução anódica utilizando um eletrodo de pasta de carbono modificado com resina de troca iônica Amberlite IR 120

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