Dipyridylamine-modified nanoporous silicas as new sorbents for the separation and pre-concentration of palladium

Mehrani, Kheyrollah; Mehrani, Azadeh; Amini, Mostafa M.; Sadeghi, Omid; Tavassoli, Najmeh

doi:10.1007/s00604-011-0590-7

Cited by 25 publications

(11 citation statements)

References 34 publications

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“…Digestion was carried out for 2 min at 250 W, 2 min at 0 W, 6 min at 250 W, 5 min at 400 W, and 8 min at 550 W, and the mixture was then vented for 8 min. The residue from this digestion was then diluted with deionized water up to the total volume of 10 mL . Then the pH of sample solution was adjusted to pH 4 (optimum pH) and the presented method was applied for determination of gold ions content.…”

Section: Methodsmentioning

confidence: 99%

A high selective ion-imprinted polymer grafted on a novel nanoporous material for efficient gold extraction

et al. 2013

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In this work, for the first time, an ion-imprinted polymer was developed for selective extraction and determination of gold ions. To increase the sorbent efficiency, this polymer was coated on a novel nanoporous carbon-based material, carbohydrate-derived Max-Planck Gesellschaft 1, which is also the first example of grafting imprinted polymer on nanoporous-carbon material. These particles were applied successfully for preconcentration of ultratrace amount of gold ions, following determination by flame atomic absorption spectrometry. Some effective factors on the efficiency of gold ions extraction, such as concentration and volume of eluent, sample and eluent flow rates, and also effect of interfering ions especially palladium and platinum ions, were investigated. The LOD was determined to be 0.27 ng/mL. Furthermore, the precision of the method was calculated to be 2.14% under optimal conditions with recovery more than 97.3%. The technique was also used to determine the concentration of gold ions in mine stone samples with satisfactory results. The accuracy of this method was investigated by determination of gold ions concentrations in several reference materials with certified gold content.

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Section: Methodsmentioning

confidence: 99%

A high selective ion-imprinted polymer grafted on a novel nanoporous material for efficient gold extraction

et al. 2013

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“…Among the tested variables, pH was found to be the most critical parameter for adsorption of metals on the polythiophene-TiO 2 nanoparticles [45]. To evaluate the effect of pH on the extraction efficiency, the pH of 25 mL of sample solutions containing 2 mg·L −1 of copper and silver ions was adjusted in the range of 2 to 9.…”

Section: Effect Of Solution's Phmentioning

confidence: 99%

Separation/Enrichment of Copper and Silver Using Titanium Dioxide Nanoparticles Coated with Poly-Thiophene and Their Analysis by Flame Atomic Absorption Spectrophotometry

Behbahani¹,

Babapour²,

Amini³

et al. 2013

AJAC

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We report on the use of titanium dioxide nanoparticles (NPs) coated with poly-thiophene for the preconcentration of copper and silver ions. The NPs were prepared by first modifying the surface of TiO 2 NPs with vinyl groups and then copolymerizing them with vinyl thiophen. The resulting TiO 2 -polythiophene core-shell NPs were characterized by thermogravimetry, differential thermal analysis, scanning electron microscopy, Fourier transform infrared spectrometry and X-ray diffraction. The experimental conditions such as pH value, adsorption and desorption time, type, concentration and volume of the eluent, break through volume, and effect of potentially interfering ions were optimized. The ions were then desorbed with hydrochloric acid and determined by FAAS. The limits of detection are 0.4 and 1.2 µg·L −1 for Cu(II) and Ag(I), respectively, and recoveries and precisions are >98.0% and <4%.

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“…With the emergence of SPE, various sorbents have been developed such as carbon nanotubes (Behbahani et al 2014i), activated carbon (Starvin and Prasada Rao 2004), polymeric adsorbent resin (Huck and Bonn 2000), Amberlite XAD-7 resin (Kumar et al 2001), synthetic zeolites (Mostafavi et al 2006), modified chromosorb , TiO 2 (Behbahani et al 2013b), activated alumina (Poole 2003), and nanoporous silica (Bagheri et al 2012). Among these sorbents, nanoporous silicas such as have attracted great attention because of their good mechanical and thermal stability and their lower susceptibility to swelling and shrinking (Mehrani et al 2011). In spite of these advantages, their applications without proper surface modifications and functionalizations are limited (Behbahani et al 2014j).…”

Section: Introductionmentioning

confidence: 99%

Application of 1-(2-pyridylazo)-2-naphthol-modified nanoporous silica as a technique in simultaneous trace monitoring and removal of toxic heavy metals in food and water samples

Abolhasani

Behbahani

2014

Environ Monit Assess

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Solid-phase extraction is one the most useful and efficient techniques for sample preparation, purification, cleanup, preconcentration, and determination of heavy metals at trace levels. In this paper, functionalized MCM-48 nanoporous silica with 1-(2-pyridylazo)-2-naphthol was applied for trace determination of copper, lead, cadmium, and nickel in water and seafood samples. The experimental conditions such as pH, sample and eluent flow rate, type, concentration and volume of the eluent, breakthrough volume, and effect of coexisting ions were optimized for efficient solid-phase extraction of trace heavy metals in different water and seafood samples. The content of solutions containing the mentioned heavy metals was determined by flame atomic absorption spectrometry (FAAS), and the limits of detection were 0.3, 0.4, 0.6, and 0.9 ng mL(-1) for cadmium, copper, nickel, and lead, respectively. Recoveries and precisions were >98.0 and <4%, respectively. The adsorption capacity of the modified nanoporous silica was 178 mg g(-1) for cadmium, 110 mg g(-1) for copper, 98 mg g(-1) for nickel, and 210 mg g(-1) for lead, respectively. The functionalized MCM-48 nanoporous silica with 1-(2-pyridylazo)-2-naphthol was characterized by thermogravimetry analysis (TGA), differential thermal analysis (DTA), transmission electron microscopy (TEM), Fourier transform infrared spectrometry (FT-IR), X-ray diffraction (XRD), elemental analysis (CHN), and N2 adsorption surface area measurement.

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Dipyridylamine-modified nanoporous silicas as new sorbents for the separation and pre-concentration of palladium

Cited by 25 publications

References 34 publications

A high selective ion-imprinted polymer grafted on a novel nanoporous material for efficient gold extraction

A high selective ion-imprinted polymer grafted on a novel nanoporous material for efficient gold extraction

Separation/Enrichment of Copper and Silver Using Titanium Dioxide Nanoparticles Coated with Poly-Thiophene and Their Analysis by Flame Atomic Absorption Spectrophotometry

Application of 1-(2-pyridylazo)-2-naphthol-modified nanoporous silica as a technique in simultaneous trace monitoring and removal of toxic heavy metals in food and water samples

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