Investigation of different polymerization methods on the analytical performance of palladium(II) ion imprinted polymer materials

Daniel, Sobhi; Rao, P. Rama; Rao, T. Prasada

doi:10.1016/j.aca.2004.12.052

Cited by 103 publications

(41 citation statements)

References 19 publications

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“…The results obtained from the retention capacity studies are shown in Table 2 librium loading values for IIP particles are higher than the corresponding CP particles as observed in our previous studies [9,19]. Furthermore, the retention capacity values obtained in the present study employing styrene-DVB are comparable to erbium(III) IIP particles [13] but much higher than the other metal IIP particles synthesized so far [9,19].…”

Section: Retention Capacitysupporting

confidence: 71%

Ion imprinted polymer particles for separation of yttrium from selected lanthanides

Kala

Rao²

2006

J of Separation Science

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Lanthanide(III) (Dy, Gd, Tb and Y) ion imprinted polymer (IIP) materials were synthesized via single pot reaction by mixing lanthanide imprint ion with 5,7-dichloroquinoline-8-ol, 4-vinylpyridine, styrene, divinylbenzene and 2,2'-azobisisobutyronitrile in 2-methoxyethanol porogen. The imprint ion was removed by stirring the above materials (after powdering) with 6 mol/L HCl to obtain the respective lanthanide IIP particles. Y-Dy, Y-Gd and Dy-Gd polymer particles were obtained by physically mixing equal amounts of the respective leached individual lanthanide(III) particles. Control polymer (CP) particles were similarly prepared without imprint ion. Application of the above synthesized polymer particles was tested for separation of Y from Dy, Gd and Tb employing batch and column SPE methods using inductively coupled plasma atomic emission spectrometry for the determination. Optimization studies show that Y present in 500 mL can be preconcentrated using Dy-Gd IIP particles and eluted with 20 mL of 1.0 mol/L of HCl, providing an enrichment factor of approximately 25. Dy-Gd IIP particles offer higher selectivity coefficients for Y over other lanthanides compared to other IIP particles and commercial liquid-liquid extractants. Selectivity studies for Y over other coexisting inorganic species (other than lanthanides) were also conducted and the results obtained show a quantitative separation of Y from other inorganics other than Cu(II) and Fe(III). Furthermore, both batch and column studies indicate the purification of yttrium concentrate from 55.0 +/- 0.2 to 65.2 +/- 0.2% in a single stage of operation.

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Section: Retention Capacitysupporting

confidence: 71%

Ion imprinted polymer particles for separation of yttrium from selected lanthanides

Kala

Rao²

2006

J of Separation Science

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“…Several techniques have been developed to obtain MIPs, and they have been compared or reviewed recently. [12][13][14] So far, most of the MIPs have been prepared in less-polar organic solvents by bulk polymerization techniques. 15 The disadvantage of this method is that the obtained bulk polymer needs to be crushed, ground and sieved to produce HPLC packing particles.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Evaluation of Uniform-size (-)-Ephedrine-imprinted Polymeric Microspheres by Multi-step Swelling and Suspension Polymerization

Zhang

et al. 2006

ANAL. SCI.

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Ephedrine-imprinted polymeric microspheres have been prepared in an aqueous system by multi-step swelling and suspension polymerization, using methacrylic acid (MAA) as a functional monomer, and ethylene glycol dimethacrylate (EGDMA) as a cross-linker. Scanning electron microscopy (SEM) was used as a means to identify the structure features of the obtained polymers. Further, we examined the recognition mechanism of the polymers and the influences of some chromatographic conditions, such as the mobile-phase composition, flow-rate, column temperature and sample amount on the retentivity and selectivity for (-)-ephedrine and (+)-ephedrine. The results reveal that stable macroporous polymer beads with good size monodispersity were obtained, the average size of which was 3 -5 μm. Baseline chiral separation of the template isomers was achieved on a short column (50 mm × 4.6 mm i.d.) when the prepared polymer beads were used as a stationary phase, while the non-imprinted polymers (NIPs) did not show such ability. The optimized chromatographic condition was as follows: acetonitrile-acetic acid (99.8/0.2, v/v) as the mobile phase; sample amount, 40 -80 μg; flow rate, 1.0 ml min -1 ; and column temperature, room temperature, respectively. It is assumed that two classes of binding sites exist in the porous polymers, one being hydrophilic binding sites, the other being hydrophobic binding sites.

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“…37 Em outro trabalho dos mesmos autores foram avaliados os efeitos de impressão, extração, retenção e seletividade usando os métodos de polimerização em bulk, precipitação e suspensão, onde foi verificado que o método em bulk e de precipitação apresentaram resultados melhores que o método de suspensão. 12 Existem ainda diversos trabalhos para outros íons utilizando-se a síntese por aprisionamento, como para os íons Hg 2+ , Cd 2+ e Cu 2+ . [38][39][40] De maneira geral, IIPs obtidos pela técnica de aprisionamento apresentam alta capacidade de retenção, coeficiente de seletividade e efeito de impressão mais evidente quando comparada com as outras técnicas de síntese apresentadas.…”

Section: Polímeros Orgânicos Impressos Com íOnsunclassified

Polímeros impressos com íons: fundamentos, estratégias de preparo e aplicações em química analítica

Marestoni¹,

Sotomayor²,

Segatelli³

et al. 2013

Quím. Nova

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Recebido em 29/1/13; aceito em 18/5/13; publicado na web em 1/7/13 ION IMPRINTED POLYMERS: FUNDAMENTALS, PREPARATION STRATEGIES AND APPLICATIONS IN ANALYTICAL CHEMISTRY. Chemical imprinting technology has been widely used as a valuable tool in selective recognition of a given target analyte (molecule or metal ion), yielding a notable advance in the development of new analytical protocols. Since their discovery, molecularly imprinted polymers (MIPs) have been extensively studied with excellent reviews published. However, studies involving ion imprinted polymers (IIPs), in which metal ions are recognized in the presence of closely related inorganic ions, remain scarce. Thus, this review involved a survey of different synthetic approaches for preparing ion imprinted adsorbents and their application for the development of solid phase extraction methods, metal ion sensors (electrodes and optodes) and selective membranes.Keywords: imprinting technology; preconcentration; sensors. INTRODUÇÃOO desenvolvimento de novos materiais tem se expandido para diversos campos do conhecimento e trazido grandes inovações em diversas áreas. Neste sentido, o estudo de novos materiais pode contribuir significativamente na área de química analítica, introduzindo maior seletividade e sensibilidade aos métodos analíticos conhecidos, por exemplo, através da variação da composição química, das dimensões físicas e da inclusão de componentes biológicos fazendo com que estes apresentem propriedades novas, o que potencializa uma ampla aplicabilidade. Tais materiais incluem os materiais híbridos, nanomateriais e materiais biomoleculares.1 Diante de uma nova realidade, na qual se tem buscado o estabelecimento de padrões de concentrações cada vez menores de poluentes em amostras de interesse ambiental, farmacêutica, clínica e alimentí-cia, métodos alternativos vêm sendo investigados, dentre os quais o uso de materiais adsorventes, que promovam a retenção seletiva e reversível do analito. A determinação de espécies químicas em concentrações baixas (em geral ≤ µg L -1 ) constitui, até os dias atuais, um dos grandes desafios para os químicos analíticos, apesar dos mesmos terem em mãos técnicas significativamente precisas, seletivas e sensíveis.2 Em face à concentração baixa do elemento de interesse e, ainda aos efeitos da matriz, em muitos casos torna-se uma tarefa difícil a determinação direta de concentrações baixas de analitos em amostras. Sendo assim, etapas de pré-concentração se fazem necessárias a fim de viabilizar a análise. Em determinadas situações, as etapas de pré-concentração além de conferir aumento de sensibilidade do método, deve também garantir seletividade ao sistema em estudo. Isto ocorre porque, em geral, os níveis dos analitos são muito baixos, da ordem de µg L -1 , na presença de concentrações altas de concomitantes, da ordem de g L -1 . Sendo assim, os tratamentos prévios da amostra, conferidos por etapas de extração e/ou pré-concentração, visam eliminar o interferente e/ou pré-concentrar o analito.As principais estratégias ana...

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Investigation of different polymerization methods on the analytical performance of palladium(II) ion imprinted polymer materials

Cited by 103 publications

References 19 publications

Ion imprinted polymer particles for separation of yttrium from selected lanthanides

Ion imprinted polymer particles for separation of yttrium from selected lanthanides

Preparation and Evaluation of Uniform-size (-)-Ephedrine-imprinted Polymeric Microspheres by Multi-step Swelling and Suspension Polymerization

Polímeros impressos com íons: fundamentos, estratégias de preparo e aplicações em química analítica

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