Selective sorbent enrichment of nickel ions from aqueous solutions using a hierarchically hybrid organic-inorganic polymer based on double imprinting concept

Nacano, Letícia Ramos; Segatelli, Mariana Gava; Tarley, César Ricardo Teixeira

doi:10.1590/s0103-50532010000300004

Cited by 37 publications

(10 citation statements)

References 15 publications

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“…Nevertheless, the search for selective sorbents has been extensive. In recent years, molecularly imprinted polymers (MIPs) have found applications as sensors and catalysts, in fluorescence spectroscopy, chromatographic separation, and MEPS for sample cleanup . The main advantages of MIPs are their low cost, robustness, resistance to a wide range of pH, temperatures and solvents, high mechanical strength, and storage stability .…”

Section: Introductionmentioning

confidence: 99%

Microextraction by packed sorbent liquid chromatography with time‐of‐flight mass spectrometry of triazines employing a molecularly imprinted polymer†

Andrade

Santos-Neto

Lanças

2014

J of Separation Science

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Molecularly imprinted polymers for the determination of triazines were synthesized by precipitation using atrazine as template, methacrylic acid as functional monomer, ethylene glycol dimethacrylate as crosslinker, and 2,2'-azobisisobutrynitrile as initiator. The polymers were characterized by infrared spectroscopy and scanning electron microscopy and packed in a device for microextraction by packed sorbent aiming for the preconcentration/cleanup of herbicides, such as atrazine, simazine, simetryn, ametryn, and terbutryn in corn samples. Liquid chromatography coupled with time-of-flight mass spectrometry was used for the separation and determination of the herbicides. The selectivity coefficient of molecularly imprinted polymers was compared with that of nonimprinted polymer for the binary mixtures of atrazine/propanil and atrazine/picloram, and the values obtained were 15.6 and 2.96, respectively. The analytical curve ranged from 10 to 80 μg/kg (r = 0.989) and the limits of detection and quantification in the corn matrices were 3.3 and 10 μg/kg, respectively. Intra- and interday precisions were < 14.8% and accuracy was better than 90.9% for all herbicides. Polymer synthesis was successfully applied to the cleanup and preconcentration of triazines from fortified corn samples with 91.1-109.1% of recovery.

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Section: Introductionmentioning

confidence: 99%

Microextraction by packed sorbent liquid chromatography with time‐of‐flight mass spectrometry of triazines employing a molecularly imprinted polymer†

Andrade

Santos-Neto

Lanças

2014

J of Separation Science

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“…40 Nacano et al found the maximum adsorption capacity of the prepared nickel-imprinted polymers using 2-aminoethyl-3-aminobutylmethyldimethoxysilane as functional monomer as 5.44 mg g −1 . 41 Lenoble demonstrated the removal amount of nickel ions as 12.0 mg g −1 with the nickelimprinted polymers prepared in the presence of vinylbenzyl iminodiacetic acid. 42 However, none of these methods demonstrated the high specificity and selectivity by slight physical changes, such as pH and temperature.…”

Section: The Effect Of Initial Concentrationmentioning

confidence: 99%

Molecularly imprinted smart cryogels for selective nickel recognition in aqueous solutions

Andaç

Tamahkar

Deni̇zli̇

2020

J of Applied Polymer Sci

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Smart polymers with fast response to slight changes show high practicability in separation and removal applications, such as water and wastewater treatment. Molecular imprinted polymers (MIPs) are designed to possess specific binding sites enabling the recognition of the target analytes. In this article, the newly synthesized smart adsorbents were used for the selective removal of nickel [Ni(II)] ions from aqueous solutions, which have dual (pH and temperature) memory for the recognition of Ni(II) ions due to the self-assembled recognition sites in MIP structure. The Ni(II)-MIP smart cryogels were prepared by cryopolymerization of N-isopropylacrylamide (NIPAm) and N-methacryloyl-Lhistidine (MAH) monomers to incorporate their smart features for removal of Ni(II) ions in a selective and temperature-modulated way. The maximum binding capacity of Ni(II) ions onto MIP smart cryogel was determined at pH 6 as 414 μg g −1 at 20 C and only 104.5 μg g −1 at 40 C, respectively. The adsorption reached an equilibrium within 30 min, while 85% of the bound amount of Ni(II) ions was achieved in only 15 min. This unique MIP cryogel as a smart and selective adsorbent was able to remove Ni(II) ions immediately by a significant temperature and pH change as an alternative application for water and wastewater treatment.

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“…52,54 Assim sendo, quando polímeros impressos são preparados via processo sol-gel fazendo uso de precursores funcionais, tais como 3-mercaptopropiltrimetoxissilano ou 2-aminoetilamina-3-propiltrimetoxissilano e do agente reticulante TEOS, o polímero resultante pode ser definido como polímero orgânico-inorgânico impresso. Esta definição é aceita, tendo em vista que o grupo alcoóxido metálico do precursor funcional reage com o TEOS por meio de reações de condensação e policondensação, permitindo a formação da matriz polimérica.…”

Section: Polímeros Híbridos Orgânicos-inorgânicos 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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Selective sorbent enrichment of nickel ions from aqueous solutions using a hierarchically hybrid organic-inorganic polymer based on double imprinting concept

Cited by 37 publications

References 15 publications

Microextraction by packed sorbent liquid chromatography with time‐of‐flight mass spectrometry of triazines employing a molecularly imprinted polymer†

Microextraction by packed sorbent liquid chromatography with time‐of‐flight mass spectrometry of triazines employing a molecularly imprinted polymer†

Molecularly imprinted smart cryogels for selective nickel recognition in aqueous solutions

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

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