Acid–base properties of ion exchangers. III. Anion exchangers on the basis of polyacrylonitrile fiber

Шункевич, А. А.; Akulich, Z. I.; Медяк, Г. В.; Солдатов, В. С.

doi:10.1016/j.reactfunctpolym.2005.02.002

Cited by 44 publications

(19 citation statements)

References 10 publications

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“…[1,3]. Also IEF has been widely used in biochemical separation [7], analysis [5], recovery of precious metals [2,5,8], treatment of nuclear and industrial wastewater [2,6,7,9], purification of toxic gas and environmental protection [2,5], and drug delivery [10][11][12][13][14]. Several synthetic fibers, such as polyester, polyacrylonitrile and polypropylene, have been used as the parent fiber for the production of conventional IEF.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of a strong basic anion exchanger by radiation-induced grafting of styrene onto poly(tetrafluoroethylene) fiber

Zhang

Chen

et al. 2008

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Preparation and characterization of a strong basic anion exchanger by radiation-induced grafting of styrene onto poly(tetrafluoroethylene) fiber

Zhang

Chen

et al. 2008

Journal of Colloid and Interface Science

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“…Potentiometric titration is frequently used to study the acid-base properties of solid surfaces. 12,13 Linear and non-linear numerical analysis techniques are commonly used in the treatment of potentiometric data for humic acids, proteins, and chitosan. [14][15][16] The complexity of these equations has evolved along with computers and software and the calculation load.…”

Section: Introductionmentioning

confidence: 99%

Characterization of copper adsorption on oxidized activated carbon

Mesquita¹,

Martelli²,

Gorgulho³

2006

J. Braz. Chem. Soc.

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Esse artigo discute a adsorção de íon Cu(II) em carvão ativado oxidado com HNO 3 . As modificações introduzidas na superfície do carvão ativado (CA) foram caracterizadas por medidas de área superficial, espectroscopia de absorção no infravermelho, titulação pelo tradicional método de Boehm e titulação potenciométrica. Os dados da titulação potenciométrica foram ajustados através de um método não linear desenvolvido para determinar a concentração e distribuição do pKa dos sítios ácidos ionizáveis presentes na superfície do CA, antes e após a oxidação com HNO 3 . Os estudos de adsorção foram realizados em batelada para a faixa de concentração de 0,08 a 1,75 mmol L -1 em pH = 4,0. Os resultados mostraram que o tratamento do CA com ácido leva à diminuição na área superficial aparente e produz leves modificações na estrutura de poros. Entretanto, a oxidação influenciou fortemente a estrutura química da superfície do CA através do aumento na concentração de grupos ácidos com pKa < 6, causando assim uma melhora significativa na adsorção do íon Cu(II). A maior capacidade de adsorção do CA oxidado foi relacionada à presença de grupos ácidos com pKa < 4, revelando o importante papel destes grupos na adsorção pelo mecanismo de troca iônica. This paper discusses Cu(II) ion adsorption onto oxidized activated carbon with HNO 3 . The modifications introduced on the activated carbon (AC) surface were characterized by surface area measurement, FT-IR spectroscopy, titration by the traditional Boehm procedure, and potentiometric titration. A nonlinear method for fitting acid-base potentiometric titration data was applied to determine the concentration and pKa distributions of the ionizable acidic sites on AC, before and after HNO 3 oxidation. Adsorption studies were conducted in batch mode for the concentration range 0.08 to 1.75 mmol L -1 and pH = 4.0. Results showed that the acid treatment of AC leads to a decrease in apparent surface areas and produces slight modifications in pore structure. However, oxidation strongly influenced the AC surface chemical structures by increasing the concentration of acidic groups with pKa < 6.0, which significantly improved Cu(II) ion adsorption. The uptake enhanced for oxidized carbon was related to the presence of acidic groups with pKa lower than 4, revealing the important role of acidic groups in adsorption by ion-exchange mechanisms.

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“…Their high stiffness, tensile strength, chemical resistance, and electrical and thermal conductivity make them attractive for applying as reinforcement for specimens, including concrete materials. In the lastest decade, as a kind of green material for concrete, PAN fiber is considered as a promising candidate in a wide range of applications [4][5][6][7][8] . Xu et al 9 studied the performance of fiber reinforced asphalt concrete (AC) under environmental temperature and water effects and he found that the fibers have significantly improved AC's rutting resistance, fatigue life, and toughness.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Durability Performance of Polyacrylonitrile Fiber Reinforced Concrete

Fan

2015

Mat. Res.

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Acid–base properties of ion exchangers. III. Anion exchangers on the basis of polyacrylonitrile fiber

Cited by 44 publications

References 10 publications

Preparation and characterization of a strong basic anion exchanger by radiation-induced grafting of styrene onto poly(tetrafluoroethylene) fiber

Preparation and characterization of a strong basic anion exchanger by radiation-induced grafting of styrene onto poly(tetrafluoroethylene) fiber

Characterization of copper adsorption on oxidized activated carbon

Mechanical and Durability Performance of Polyacrylonitrile Fiber Reinforced Concrete

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