Electroanalytical Applications of Microporous Zeolites and Mesoporous (Organo)Silicas: Recent Trends

Walcarius, Alain

doi:10.1002/elan.200704144

Cited by 147 publications

(109 citation statements)

References 235 publications

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Section: Introductionmentioning

confidence: 99%

“…Walcarius presented very comprehensive reviews about the contributions of silica-based electrodes to electroanalysis. [19][20][21] Another advantageous feature presented by CPEs chemically modified with organofunctionalized silica is their high stability since chemical modifier is covalently bonded to silica which avoids its loss by dissolution or leaching.Nanostructured [22][23][24] and mesoporous 25-30 silica have been widely used to prepare chemically modified electrodes for quantification of several metallic ions. Conventional silica (amorphous and silica gel) have also been used and it has allowed the reliable and low level quantification of Cu 2+ and Ni 2+ in ethanol fuel samples, [31][32][33] Hg 2+ and Cd 2+ in natural waters, 34,35 etc.…”

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confidence: 99%

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Fast and simultaneous determination of Pb2+ and Cu2+ in water samples using a solid paraffin-based carbon paste electrode chemically modified with 2-aminothiazole-silica-gel

Silva¹,

Costa²,

Takeuchi³

et al. 2011

J. Braz. Chem. Soc.

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Um eletrodo de pasta de carbono preparado com parafina sólida como aglutinante e quimicamente modificado com sílica funcionalizada com grupos 2-aminotiazol foi empregado na quantificação simultânea de Pb 2+ e Cu 2+ em amostras de água por meio de voltametria de redissolução anódica. O presente método emprega um tempo curto de pré-concentração (180 s), o qual permitiu a quantificação simultânea e confiável de Pb 2+ e Cu 2+ de maneira bastante rápida. Foram obtidos limites de detecção de 7,3 e 90 nmol L −1 para Pb 2+ e Cu 2+ , respectivamente. Estes valores estão abaixo das concentrações máximas permitidas destes metais em água potável segundo a legislação brasileira, indicando que o método proposto é aplicável para o monitoramento de Pb 2+ e Cu 2+ em amostras de água. Estudos de recuperação foram realizados em quatro amostras de água enriquecidas, sendo obtidas porcentagens de recuperação próximas a 100% para todas as amostras analisadas, demonstrando a boa acuracidade do método proposto.A solid paraffin-based carbon paste electrode modified with 2-aminothiazole functionalized silica-gel was used for simultaneous quantification of Pb 2+ and Cu 2+ in water samples by anodic stripping voltammetry. The present method uses short preconcentration time (180 s), which allowed reliable and simultaneous quantification of Pb 2+ and Cu 2+ in a very fast way. Detection limits of 7.3 and 90 nmol L −1 were obtained for Pb 2+ and Cu 2+ , respectively. These values are below their maximum concentrations allowed in drinking water by Brazilian legislation, indicating that the proposed method is useful to monitoring Pb 2+ and Cu 2+ in water samples. Recovery studies were performed in four spiked water samples and the results shown recovery percentages close to 100% for all analyzed samples, demonstrating the good accuracy of the proposed method.Keywords: anodic stripping voltammetry, carbon paste electrode, 2-aminothiazolefunctionalized silica gel, lead and copper determination, water samples IntroductionEnvironmental contamination by heavy metals is a growing concern because they are very toxic, bioaccumulative and totally non-degradable. Therefore, environmental monitoring of heavy metals is of great importance for many reasons, such as identification of pollutant sources, understanding pollutant dissemination, anticipation of remediation procedures, etc. Copper and lead are two very important metallic pollutants because they are toxic and abundant. Contamination of natural waters by anthropogenic activities is one of the main ways to introduce heavy metals in the environment. Therefore, quantification of metallic ions in water samples is very important in order to preserve safe water resources for world population. In all regions around the world, legislative instruments are very restrictive regarding copper and lead contents in water for human consumption. In Brazil, for example, limits for Pb 2+ and Cu 2+ in drinking water are 0.01 mg L −1 (48 nmol L −1 ) and 2 mg L −1 (31 μmol L −1 ) , respectively. 1 Graphite furnace ato...

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Fast and simultaneous determination of Pb2+ and Cu2+ in water samples using a solid paraffin-based carbon paste electrode chemically modified with 2-aminothiazole-silica-gel

Silva¹,

Costa²,

Takeuchi³

et al. 2011

J. Braz. Chem. Soc.

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“…This includes the removal of heavy metals from soils and water streams [122,123] or the ability to bind pathogens in order to remove them from wastewater treatment plants, thus including sludge activity [124,125]. The outstanding relevance of zeolites is further illustrated by the number of reviews and research papers available in the literature covering topics as diverse as their use in catalysis (with reviews dating back to 1971 [126,127]), pollution control [128], electrochemistry (zeolites may act as electrode modifiers due to their ion-exchange and size selectivity capability) [129], photocatalysis [130], thin film technology for applications as membranes and electronic devices [131][132][133][134][135], or pharmaceutical applications [136].…”

Section: Synthesis and Structurementioning

confidence: 99%

Ordered Porous Nanomaterials: The Merit of Small

Murcia

2013

ISRN Nanotechnology

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This paper will introduce the reader to some of the “classical” and “new” families of ordered porous materials which have arisen throughout the past decades and/or years. From what is perhaps the best-known family of zeolites, which even now to this day is under constant research, to the exciting new family of hierarchical porous materials, the number of strategies, structures, porous textures, and potential applications grows with every passing day. We will attempt to put these new families into perspective from a synthetic and applied point of view in order to give the reader as broad a perspective as possible into these exciting materials.

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“…Intrinsic and sometimes unique properties of zeolites or silica-based materials in combination with electron transfer processes characterise a particular group of chemical modifiers whose use in the electrode configurations is of continuing interest, including the carbon paste-based variants [40,[222][223][224][225]. Both natural and synthetic zeolites [222,225] are microporous crystalline alumino-silicates that exhibit ion-exchange capacity and molecular-sieve properties.…”

Section: Zeolite-and Silica-modified Carbon Paste Electrodesmentioning

confidence: 99%

“…Both natural and synthetic zeolites [222,225] are microporous crystalline alumino-silicates that exhibit ion-exchange capacity and molecular-sieve properties. Silicas [223,224] as special variants of SiO 2 then offer possibilities to be functionalized with a variety of organic groups, including preparation of inorganic / organic hybrids, combining -in a single solid -mechanical stability of the inorganic skeleton with reactivity of the organic moiety.…”

Section: Zeolite-and Silica-modified Carbon Paste Electrodesmentioning

confidence: 99%

Carbon paste electrodes in the new millennium

et al. 2009

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Abstract:In this review (with 500 refs), both electrochemistry and electroanalysis with carbon paste-based electrodes, sensors, and detectors are of interest, when attention is focused on the research activities in the years of new millennium. Concerned are all important aspects of the field, from fundamental investigations with carbon paste as the electrode material, via laboratory examination of the first electrode prototypes, basic and advanced studies of various electrode processes and other phenomena, up to practical applications to the determination of inorganic ions, complexes, and molecules. The latter is presented in a series of extensive tables, offering a nearly complete survey of methods published within the period of [2001][2002][2003][2004][2005][2006][2007][2008]. Finally, the latest trends and outstanding achievements are also outlined and future prospects given.© Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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Electroanalytical Applications of Microporous Zeolites and Mesoporous (Organo)Silicas: Recent Trends

Cited by 147 publications

References 235 publications

Fast and simultaneous determination of Pb2+ and Cu2+ in water samples using a solid paraffin-based carbon paste electrode chemically modified with 2-aminothiazole-silica-gel

Fast and simultaneous determination of Pb2+ and Cu2+ in water samples using a solid paraffin-based carbon paste electrode chemically modified with 2-aminothiazole-silica-gel

Ordered Porous Nanomaterials: The Merit of Small

Carbon paste electrodes in the new millennium

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