A novel needle trap sorbent based on carbon nanotube-sol–gel for microextraction of polycyclic aromatic hydrocarbons from aquatic media

Bagheri, Habib; Ayazi, Zahra; Aghakhani, Ali

doi:10.1016/j.aca.2010.10.026

Cited by 107 publications

(35 citation statements)

References 49 publications

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“…Nevertheless, for the design of an optimized preconcentration system, there is a lack of understanding how the nanotube structure affects sorption properties, which is necessary for the development of an optimized extraction system. In this regard, multi-walled carbon nanotubes have been proven to be powerful adsorbents for extracting pollutants [25] such as PAH from water samples [26][27][28] One of the major drawbacks when working with CNT is their strong tendency for aggregation. The highly polarizable nanotubes readily form bundles (or ropes) consisting of many nanotubes bound together by van der Waals forces, making it difficult to use them as individual species.…”

Section: Introductionmentioning

confidence: 99%

Quenching of fluorene fluorescence by single-walled carbon nanotube dispersions with surfactants: application for fluorene quantification in wastewater

et al. 2015

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The fluorescence of fluorene in aqueous solutions of surfactants of different natures, anionic sodium dodecylsulphate (SDS), cationic cetyltrimethyl ammonium chloride (CTAC) and non-ionic polyoxyethylene-23-lauryl ether (Brij 35), as well as in single-walled carbon nanotube (SWCNT) dispersions in these surfactants, has been studied and compared. A fluorescence quenching phenomenon has been observed in the presence of SWCNT, the effect being stronger for dispersions in CTAC, related to the improved dispersion capability of this surfactant as revealed by microscopic observations and its stronger adsorption onto the SWCNT surfaces as inferred from the Raman spectra. SWCNT interact with fluorene causing a fluorescence quenching. The fluorescence intensity ratio, calculated in the absence and in the presence of SWCNT, follows the SternVolmer equation. For the CTAC concentration that provides the highest quenching effect, the analytical characteristics of the fluorimetric method like sensitivity, detection and quantification limits, repeatability, reproducibility and robustness have been calculated. Results demonstrate that it is possible to determine fluorene in a fortified wastewater sample in aqueous solutions of CTAC and SWCNT/CTAC dispersions, showing recoveries close to 100 %. The quenching effect found in this work could be useful for the development of an optical device that uses SWCNT-based receptors for fluorene detection and quantification in aqueous surfactant solutions.

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Section: Introductionmentioning

confidence: 99%

Quenching of fluorene fluorescence by single-walled carbon nanotube dispersions with surfactants: application for fluorene quantification in wastewater

et al. 2015

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“…c Limits of detection, polypyrrole sorbent, HS-SPDE-GC-MS [27] d Limits of detection, polypyrrole coating, SPME-GC-MS [28] e Limits of detection, PDMS coating (0.01 cm film thickness), SPME-GC-MS [29] f Limits of detection, CNT/silica composite, NTE-GC-MS [30] g Relative standard deviation, polypyrrole sorbent, HS-SPDE-GC-MS [32] h Relative standard deviation, polypyrrole coating, SPME-GC-MS [23] i Relative standard deviation, PDMS coating (0.01 cm film thickness), SPME-GC-MS [24] j Limits of detection, CNT/silica composite, SPME-GC-MS [30] …”

Section: Resultsmentioning

confidence: 99%

New Grafted Nanosilica-Based Sorbent for Needle Trap Extraction of Polycyclic Aromatic Hydrocarbons from Water Samples Followed by GC/MS

2011

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In this work, the preparation of a new grafted nanosilica-based sorbent was extensively investigated. An inexpensive modifier, cis-9-octadecenoic acid (oleic acid) was selected to be grafted on the surface of the nanosilica particles as the support. The grafting process was accurately confirmed by Fourier transform infra-red spectrometry (FT-IR). Applicability of the prepared sorbent was thoroughly examined by needle trap extraction (NTE) method. The grafted sorbent was dispersed in the appropriate solvent and carefully packed inside a steel needle. Feasibility of the method was completely examined using polycyclic aromatic hydrocarbons (PAHs), as model compounds. For extraction of analytes from aqueous samples, the prepared needle trap device (NTD) was placed in the headspace of the sample and another needle was also inserted into the sample solution to purge the circulating headspace into the sample. For increasing the extraction efficiency, influencing parameters including extraction time and temperature, flow rate of analyte through the needle trap, the ionic strength, desorption temperature, and time were optimized. The limit of detection (LOD) and relative standard deviation (RSD) values of the method under optimized conditions were 2-5 ng L -1 and 1.1-4.8%, respectively. The RSD% for fluorene was somewhat higher and a value of 16.8% at 40 ng L -1 was achieved. Finally the developed method was applied to the analysis of tap water and Zayandeh-roud river samples and the relative recovery (RR %) values were found to be in the range of 77-109%, under the optimized conditions.

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“…Hence, the K fh value decreases with rising temperature while the K hs enhances. It also implies that there is a potential compensation between the lower K fh and higher K hs in a temperature-dependent extraction process [32,33]. In addition, increase in temperature accelerates the evaporation of liquid into headspace and hence the sorption on the surface of sorbent.…”

Section: Extraction Temperaturementioning

confidence: 97%

Novel unbreakable solid‐phase microextraction fiber by electrodeposition of silica sol–gel on gold

Bagheri

Sistani

Ayazi

2011

J of Separation Science

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A new technique for preparation of an unbreakable solid-phase microextraction (SPME) fiber, using sol-gel technology is developed. Primarily, an ultrathin two-dimensional intermediate film was prepared by hydrolysis of 3-(trimethoxysilyl)-1-propanthiol self-assembled monolayer grafted onto gold, then a stationary phase by electrodeposition of 3-(trimethoxysilyl)propylmethacrylate as a precursor, tetramethyl orthosilicate and polyethylene glycol as a coating polymer was produced. The scanning electron microscopy images revealed that the new fiber exhibits a rather porous and homogenous surface. The thermal stability of the fabricated fiber was investigated by thermogravimetric analysis. The applicability of the prepared fiber coating in conjunction with gas chromatography-mass spectrometry was examined by SPME of polycyclic aromatic hydrocarbons, as model analytes, from aquatic media. An extraction time of 20 min at 50 °C gave maximum peak areas when NaCl, 15% was added to the aqueous samples. Limits of detection were in the range of 0.01-0.02 ng/mL and relative standard deviation values were in the range of 4-16% at 1 ng/mL. The developed method was successfully applied for the analysis of real water samples while the relative recovery percentage was in the range of 102-118%.

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A novel needle trap sorbent based on carbon nanotube-sol–gel for microextraction of polycyclic aromatic hydrocarbons from aquatic media

Cited by 107 publications

References 49 publications

Quenching of fluorene fluorescence by single-walled carbon nanotube dispersions with surfactants: application for fluorene quantification in wastewater

Quenching of fluorene fluorescence by single-walled carbon nanotube dispersions with surfactants: application for fluorene quantification in wastewater

New Grafted Nanosilica-Based Sorbent for Needle Trap Extraction of Polycyclic Aromatic Hydrocarbons from Water Samples Followed by GC/MS

Novel unbreakable solid‐phase microextraction fiber by electrodeposition of silica sol–gel on gold

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